CN110970786A - Small folding cavity human eye safety laser - Google Patents
Small folding cavity human eye safety laser Download PDFInfo
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- CN110970786A CN110970786A CN201911143139.0A CN201911143139A CN110970786A CN 110970786 A CN110970786 A CN 110970786A CN 201911143139 A CN201911143139 A CN 201911143139A CN 110970786 A CN110970786 A CN 110970786A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/025—Constructional details of solid state lasers, e.g. housings or mountings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08059—Constructional details of the reflector, e.g. shape
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/0813—Configuration of resonator
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lasers (AREA)
Abstract
The invention discloses a small folding cavity human eye safety laser, which comprises a laser rod (11), a light-gathering cavity (12), a xenon lamp (9) and a body (6), wherein the body (6) is of a foldable structure and comprises a first folding part and a second folding part, a first channel is arranged in the first folding part, and a second channel is arranged in the second folding part; laser stick (11) and spotlight chamber (12) are fixed in the second passageway, spotlight chamber (12) with laser stick (11) parallel arrangement, one side of body (6) is equipped with the cover turning mirror (501) of first passageway and second passageway, the opposite side be equipped with coupling output mirror (101) of first passageway axis coincidence and with full anti-mirror (401) of second passageway axis coincidence. The small folding cavity eye safety laser of the invention increases the length of the laser resonant cavity within a limited length through the folding and turning mirror and the total reflection mirror, thereby realizing the laser output with small volume, light weight and stability.
Description
Technical Field
The invention belongs to the technical field of eye-safe lasers, and particularly relates to a small-sized folding cavity eye-safe laser.
Background
The laser range finder is a device carrying a laser, and is mainly classified into five categories of a handheld type, a ground vehicle-mounted type, an air gun type, a machine-mounted type and a ship-mounted type in military affairs. The military human eye safe solid laser has wide application in the technical fields of military laser ranging, military laser irradiation, military imaging and the like, and the development direction of the military human eye safe solid laser is miniaturization, integration and lightweight.
However, the conventional lamp pump flat-cavity human eye safety solid laser has a relatively large volume, is difficult to meet the requirements of military human eye safety solid laser on volume and weight, is difficult to debug and has poor laser stability under severe environmental conditions.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a small-sized folding cavity eye-safe laser, which is foldable in structure, optical devices are respectively arranged in a first folded channel and a second folded channel, and the reflection of a turning mirror, a total reflection mirror and a coupling output mirror is arranged to realize the turning back of a light path, so that the length of a laser resonant cavity is increased within a limited length, the stable output of laser is ensured, the length of the laser is reduced at the same time, the laser can be miniaturized, light-weighted, compact and stable, and the occupied space is small.
In order to achieve the purpose, the invention provides a small folding cavity eye-safe laser, which comprises a laser rod, a light-gathering cavity, a xenon lamp and a body, wherein the body is of a foldable structure and comprises a first folding part and a second folding part, a first channel is arranged in the first folding part, and a second channel is arranged in the second folding part;
the laser rod and the light-gathering cavity are fixed in the second channel, the light-gathering cavity is parallel to the laser rod, one side of the body is provided with a turning mirror covering the first channel and the second channel, and the other side of the body is provided with a coupling output mirror coinciding with the axis of the first channel and a total reflection mirror coinciding with the axis of the second channel so as to increase the length of the laser resonant cavity in a limited length through folding and the turning mirror and the total reflection mirror.
Furthermore, a frequency conversion assembly is arranged in the first channel, the frequency conversion assembly comprises a crystal sleeve and a frequency conversion crystal arranged in the crystal sleeve, and second pressing rings are arranged at two ends of the frequency conversion crystal.
Furthermore, the side surface of the crystal sleeve is provided with a screw mounting hole, and a gasket is arranged between the frequency conversion crystal and the crystal sleeve.
Furthermore, a passive Q-switched crystal is arranged between the total reflection mirror and the laser rod.
Furthermore, the body with one side tip that coupling output mirror and total reflection mirror are connected is equipped with the end plate, it has laser rod mounting hole, total reflection mirror to lead to the unthreaded hole and the output mirror to lead to the unthreaded hole to open on the end plate.
The coupling output mirror is fixed on the output mirror seat, and a coupling output mirror pressing ring is arranged at the end part of the coupling output mirror.
Further, a first clamping ring for fastening the frequency conversion assembly is mounted in the body.
Furthermore, the two ends of the light-gathering cavity are fixed on the body through a first lamp holder and a second lamp holder respectively.
Furthermore, the bottom of the light gathering cavity is provided with a light gathering cavity gasket.
Furthermore, the body is symmetrically provided with at least two weight reduction grooves.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) the small folding cavity eye safety laser is arranged into a folding structure, the optical device is respectively arranged in the first channel and the second channel which are folded, and the reflection of the turning mirror, the total reflection mirror and the coupling output mirror is arranged to realize the turning back of the light path, so that the length of a laser resonant cavity is increased within a limited length, the stable output of laser is ensured, the length of the laser is reduced, the laser can be miniaturized, lightened, compact and stable, and the occupied space is small.
(2) According to the small folding cavity human eye safety laser, the second pressing rings are arranged at the two ends of the frequency conversion crystal, and the frequency conversion crystal is limited by the pressing rings to be prevented from moving transversely; a gasket is arranged between the frequency conversion crystal and the crystal sleeve, a screw mounting hole is formed in the side face of the crystal sleeve, and a screw is fastened from the outside to jack and fix the frequency conversion crystal.
(3) According to the small folding cavity eye safety laser, the passive Q-switched crystal is matched with external drive for use, and the purpose of pulse output is achieved by controlling the switch of laser output; the weight of the laser can be further reduced by the weight reduction groove.
Drawings
FIG. 1 is a schematic diagram of a compact folded cavity eye-safe laser in an embodiment of the invention;
FIG. 2 is a cross-sectional view of an out-coupling assembly in an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a frequency conversion assembly in an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a passive Q-switching assembly in an embodiment of the present invention;
FIG. 5 is a cross-sectional view of a gain feedback assembly in an embodiment of the present invention;
FIG. 6 is a cross-sectional view of an optical path folding assembly in an embodiment of the present invention;
FIG. 7 is a longitudinal cross-sectional view of a body in an embodiment of the invention;
FIG. 8 is a side view of a body in an embodiment of the invention;
figure 9 is a transverse cross-sectional view of a body in an embodiment of the invention.
In all the figures, the same reference numerals denote the same features, in particular: the device comprises a 1-coupling output component, a 2-frequency conversion component, a 3-passive Q-switching component, a 4-gain feedback component, a 5-optical path turning component, a 6-body, a 7-end plate, an 8-light-gathering cavity gasket, a 9-xenon lamp, a 10-first lamp holder, an 11-laser rod, a 12-light-gathering cavity, a 13-first pressing ring and a 14-second lamp holder; 101-coupled output mirror, 102-output mirror seat, 103-output pressing ring and 104-output mirror mounting hole; 201-frequency conversion crystal, 202-crystal sleeve, 203-second pressing ring and 204-frequency conversion crystal mounting hole; 301-passive Q-switched crystal, 302-Q-switched crystal mount, 303-Q-switched crystal washer; 401-total reflection mirror, 402-total reflection mirror base, 403-total reflection mirror pressing ring; 501-turning mirror, 502-turning mirror mounting seat and 503-turning pressing ring; 601-a first laser rod mounting hole, 602-a frequency conversion assembly mounting hole, 603-a light-gathering cavity gasket mounting hole, 604-a third pressing ring, 605-a fastening screw hole, 606-a glue dispensing hole, 607-a light path conversion assembly mounting interface, 608-an end plate mounting interface, 609-a xenon lamp mounting and routing interface, 610-a lamp holder mounting interface and 611-a weight reduction groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 is a schematic diagram of a compact folded cavity eye-safe laser in an embodiment of the invention. As shown in fig. 1, the small folding cavity eye-safe laser of the invention comprises a body 6, a xenon lamp 9, a laser rod 11, a coupling output component 1, a frequency conversion component 2, a passive Q-switching component 3, a gain feedback component 4, a light path turning component 5, a xenon lamp 9 and a light-gathering cavity 12; wherein, xenon lamp 9, laser rod 11, passive Q regulating subassembly 3, spotlight chamber 12 and frequency conversion subassembly 2 all set up in body 6.
Fig. 7 is a longitudinal sectional view of a body in an embodiment of the invention. Figure 8 is a side view of a body in an embodiment of the invention. As shown in fig. 1, 7 and 8, the body 6 is of a foldable structure and includes a first folding portion and a second folding portion, the first folding portion and the second folding portion are folded up and down along the side edge, a first channel is arranged in the first folding portion, and a second channel is arranged in the second folding portion; the light path turning component 5 is arranged on one side of the body 6, the coupling output component 1 and the gain feedback component 4 are arranged on the other side of the body, the coupling output component 1 is arranged at the end part of the upper channel, the gain feedback component 4 is arranged at the end part of the lower channel, and the light path turning component 5 covers the first channel and the second channel on the side edge. The folding structure shortens the length of the laser, improves the flexibility and is more suitable for the requirements of modern military assembly.
Two end plate mounting interfaces 608 are symmetrically arranged on one side of the body 6, a plurality of light path turning component mounting interfaces 607 are arranged on the other side of the body 6, and a laser rod mounting hole 601, a frequency conversion component mounting hole 602, a light gathering cavity gasket mounting hole 603 and a xenon lamp mounting wiring interface 609 are further arranged on the body 6. The light path turning component 5 is fixed on the body through the light path turning component mounting interface 607, the laser rod 11 is fixed in the second channel through the laser rod mounting hole 601, and the frequency conversion component 2 is fixed in the first channel through the frequency conversion component mounting hole 602.
The end plate 7 is fixed on the body 6 through an end plate mounting interface 608, a laser rod mounting hole, a gain feedback assembly light through hole, a coupling output assembly light through hole, a second lamp holder mounting interface and a body mounting interface are coaxially formed in the end plate 7, and the coupling output assembly 1 and the gain feedback assembly 4 are fixed on the body through the end plate 7.
Fig. 3 is a cross-sectional view of a frequency conversion assembly in an embodiment of the invention. As shown in fig. 1 and 3, the frequency conversion assembly 2 includes a frequency conversion crystal 201, a crystal cover 202, a second pressing ring 203 and a frequency conversion crystal mounting hole 204, the crystal cover 202 is fixed in the first channel, and preferably, the crystal cover 202 is disposed close to the optical path conversion assembly 5; a through frequency conversion crystal mounting hole 204 is formed in the crystal sleeve 202, the frequency conversion crystal 201 is fixed in the frequency conversion crystal mounting hole 204, second pressing rings 203 are arranged at two ends of the frequency conversion crystal 201, and the frequency conversion crystal 201 is limited by the pressing rings to prevent the frequency conversion crystal from moving transversely. Preferably, a gasket is arranged between the frequency conversion crystal 201 and the crystal sleeve 202, and the side surface of the crystal sleeve 202 is provided with a screw mounting hole, and a screw is fastened from the outside to jack the frequency conversion crystal 201. Further, a crystal gasket is arranged between the frequency conversion crystal 201 and the crystal sleeve 202. The frequency conversion component is used for carrying out frequency doubling, sum frequency, difference frequency, parametric amplification and resonance on laser, thereby expanding the existing laser wavelength.
Fig. 2 is a cross-sectional view of an out-coupling assembly in an embodiment of the invention. As shown in fig. 1 and 2, the coupling-out assembly 1 is fixed on a side of the body 1 and corresponds to the first channel, the coupling-out assembly 1 includes a coupling-out mirror 101, a coupling-out mirror base 102, a coupling-out mirror pressing ring 103 and a coupling-out mirror mounting hole 104, the coupling-out mirror base 102 is fixed on an end of the body through an end plate 7, the coupling-out mirror base 102 is provided with a coupling-out mirror mounting hole 104 coaxial with the first channel, the coupling-out mirror 101 is fixed in the coupling-out mirror mounting hole 104, and the coupling-out mirror pressing ring 103 is used for pressing the coupling-out mirror 101. Preferably, the reflectivity of the coupling-out mirror is 30% to 50%, and the light incident from the frequency conversion crystal 201 is partially reflected.
Preferably, a first clamping ring 13 is mounted in the body 6 for fastening the frequency conversion assembly 2.
Preferably, the frequency conversion crystal 201 is a KTP crystal.
Fig. 5 is a cross-sectional view of a gain feedback assembly in an embodiment of the present invention. As shown in fig. 1 and 5, the gain feedback assembly 4 includes a total reflection mirror 401, a total reflection mirror base 402 and a total reflection mirror pressing ring 403, the total reflection mirror base 402 is fixed at the end of the second channel through an end plate 7, a mounting hole is provided in the total reflection mirror base 402, the total reflection mirror 401 is mounted in the total reflection mirror base 402, the axis of the total reflection mirror 401 coincides with the axis of the second channel, and the total reflection mirror 401 is pressed tightly by the total reflection mirror pressing ring 403.
Preferably, the all-mirror 401 is a pyramid.
Fig. 3 is a cross-sectional view of a frequency conversion assembly in an embodiment of the invention. As shown in fig. 1 and 3, the passive Q-switching assembly 3 is disposed between the fully-reflecting mirror 401 and the laser rod 11, the passive Q-switching assembly 3 includes a passive Q-switching crystal 301, a Q-switching crystal seat 302 and a Q-switching crystal gasket 303, the Q-switching crystal seat 302 is fixed between the fully-reflecting mirror 401 and the laser rod 11, the passive Q-switching crystal 301 is fixed in the Q-switching crystal seat, the Q-switching crystal gasket 303 is disposed on an outer ring of the passive Q-switching crystal 301, and the Q-switching crystal gasket 303 is used for protecting the passive Q-switching crystal 302. The passive Q-switched crystal 301 is used in conjunction with an external driver to control the switching of the laser output to achieve the purpose of pulse output.
Preferably, the Q-switched crystal 301 is Cr4+YAG crystal.
The light-gathering cavity 12 is arranged in the second channel and is positioned at one side of the laser rod 11, preferably, the light-gathering cavity 12 is arranged in parallel with the laser rod 11, and the light-gathering cavity 12 is fixed on the body 6 through the first lamp holder 10 and the second lamp holder 14; the bottom in spotlight chamber 12 is equipped with spotlight chamber gasket 8, and spotlight chamber gasket 8 is used for providing the protection for spotlight chamber 12, and spotlight chamber gasket 8 passes through spotlight chamber gasket mounting hole 603 and fixes on body 6. The xenon lamp 9 is arranged in the light-gathering cavity 12, the xenon lamp 9 emits light, the distribution of the density of pumping light on the laser material is changed through the light-gathering cavity 12, so that the uniformity, the divergence and the optical distortion of output light beams are adjusted, and the laser rod 11 absorbs xenon lamp light to enable the energy level to be more front and emits laser through stimulated radiation. Preferably, the length of the laser bar is 40 mm.
Fig. 6 is a sectional view of an optical path folding assembly in an embodiment of the present invention. As shown in fig. 1 and fig. 6, the optical path turning component 5 includes a turning mirror 501, a turning mirror mounting seat 502 and a turning pressing ring 503, the turning mirror mounting seat 502 is fixed on the other side of the body, the turning mirror 501 is fixed in the turning mirror mounting seat 502, and the side of the turning mirror 501 covers the first channel and the second channel at the same time, the incident light mirror tube turning mirror 501 of the first channel/the second channel is turned and then exits into the second channel/the second channel, so as to realize the turning of the optical path, thereby increasing the length of the laser resonant cavity within a limited length. The turning clamping ring 503 is disposed at the end of the turning mirror 501 to form a closed space to protect the turning mirror 501.
Figure 9 is a transverse cross-sectional view of a body in an embodiment of the invention. As shown in fig. 9, it is preferable that the body 6 is provided with weight-reducing grooves 611, and at least two weight-reducing grooves 611 are provided and symmetrically provided on the body 6.
Preferably, the turning mirror 501 is a tip angle cone for making the incident light and the emergent light parallel.
When the xenon lamp laser device works, the xenon lamp 9 emits light, the laser rod 11 absorbs xenon lamp light to perform energy level crossing and stimulated radiation, the light is incident to the frequency conversion crystal 201 after being bent by the bending mirror 5, and the light passes through the frequency conversion mirror body 201 and then reaches the output mirror 101; the output mirror 101 reflects part of light, and then the light sequentially passes through the frequency conversion crystal 201, the turning mirror 5, the laser rod 11, the Q-switched crystal 301 and the total reflection mirror 401; the laser is reflected by the total reflection mirror 401 and then returns back and forth in the second channel and the first channel, so that vibration is formed in the resonant cavity, and after the laser is stably oscillated, the laser is emitted by the coupling output mirror 101, and the output of the pulse laser is realized. The laser has small volume, light weight and stable and reliable laser output performance through the matching design of the folding structure and the turning mirror, the total reflection mirror and the like.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A small folding cavity human eye safety laser comprises a laser rod (11), a light-gathering cavity (12) and a xenon lamp (9), and is characterized by further comprising a body (6), wherein the body (6) is of a foldable structure and comprises a first folding part and a second folding part, a first channel is arranged in the first folding part, and a second channel is arranged in the second folding part;
laser stick (11) and spotlight chamber (12) are fixed in the second passageway, spotlight chamber (12) with laser stick (11) parallel arrangement, one side of body (6) is equipped with the cover turning mirror (501) of first passageway and second passageway, the opposite side be equipped with coupling output mirror (101) of first passageway axis coincidence and with whole anti-mirror (401) of second passageway axis coincidence to increase laser resonator length in limited length through folding and turning mirror, whole anti-mirror.
2. The small folded cavity eye-safe laser device as claimed in claim 1, wherein a frequency conversion assembly (2) is arranged in the first channel, the frequency conversion assembly (2) comprises a crystal sleeve (202) and a frequency conversion crystal (201) arranged in the crystal sleeve (202), and second clamping rings (203) are arranged at two ends of the frequency conversion crystal (201).
3. The small folded cavity eye-safe laser as claimed in claim 2, wherein the side of the crystal sheath (202) is provided with screw mounting holes, and a gasket is arranged between the frequency conversion crystal (201) and the crystal sheath (202).
4. A compact folded cavity eye-safe laser as claimed in claim 1, wherein a passively Q-switched crystal is provided between the fully reflective mirror (401) and the laser rod (11).
5. The small-sized folding cavity eye-safe laser device as claimed in claim 1, wherein an end plate (7) is arranged at one side end of the body (6) connected with the coupling output mirror (101) and the total reflection mirror (401), and a laser rod mounting hole, a total reflection mirror light through hole and an output mirror light through hole are formed in the end plate (7).
6. The small-sized folding cavity eye-safe laser device as claimed in claim 1, further comprising an output mirror holder (102) fixed on the body, wherein the coupling-out mirror (101) is fixed on the output mirror holder (102), and a coupling-out mirror clamping ring (103) is arranged at an end of the coupling-out mirror (101).
7. A compact folded cavity eye-safe laser according to claim 6, wherein a first clamping ring (13) for fastening the frequency conversion assembly (2) is mounted in the body (6).
8. A compact folded cavity eye-safe laser as claimed in claim 1, wherein the concentrating cavity (12) is fixed at both ends to the body (6) by a first socket (10) and a second socket (14), respectively.
9. A compact folded cavity eye-safe laser according to claim 8, wherein the bottom of the collection cavity (12) is provided with a collection cavity spacer (8).
10. A compact folded cavity eye-safe laser as claimed in claim 1, wherein the body (6) is symmetrically provided with at least two weight-reducing grooves (611).
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| CN201911143139.0A CN110970786A (en) | 2019-11-20 | 2019-11-20 | Small folding cavity human eye safety laser |
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| CN201911143139.0A CN110970786A (en) | 2019-11-20 | 2019-11-20 | Small folding cavity human eye safety laser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111697416A (en) * | 2020-07-27 | 2020-09-22 | 深圳市北扶生物医疗科技有限公司 | Laser emitting device |
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