CN115685529B - Optical delay line based on reflecting lens and application thereof - Google Patents
Optical delay line based on reflecting lens and application thereof Download PDFInfo
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- CN115685529B CN115685529B CN202211332813.1A CN202211332813A CN115685529B CN 115685529 B CN115685529 B CN 115685529B CN 202211332813 A CN202211332813 A CN 202211332813A CN 115685529 B CN115685529 B CN 115685529B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 59
- 239000013307 optical fiber Substances 0.000 claims abstract description 23
- 238000001328 terahertz time-domain spectroscopy Methods 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 6
- 238000012014 optical coherence tomography Methods 0.000 claims description 5
- 238000004611 spectroscopical analysis Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000002310 reflectometry Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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Abstract
The invention discloses an optical delay line based on reflecting lenses and application thereof, comprising an input optical fiber collimator, an output optical fiber collimator, a first reflecting lens group and a second reflecting lens group, wherein the two reflecting lens groups are arranged in parallel, each reflecting lens in the first reflecting lens group is correspondingly and vertically projected on one adjacent two reflecting lenses in the second reflecting lens group, the convex surfaces of all the reflecting lenses in the two reflecting lens groups are oppositely arranged, the planes of all the reflecting lenses in the two reflecting lens groups are oppositely arranged, and in the two reflecting lens groups, the convex surfaces of all the reflecting lenses are on the same focal plane; the light beam is emitted to the convex surface of the reflecting lens at one end part of the second reflecting lens group through the input optical fiber collimator, and is emitted to the output optical fiber collimator from the reflecting lens at the other end part of the second reflecting lens group after being refracted, reflected and reciprocated in one reflecting lens in the second reflecting lens group and the first reflecting lens group for N times. The optical delay line has high optical path stability.
Description
Technical Field
The invention belongs to the technical field of optical scanning, and particularly relates to an optical delay line based on a reflecting lens and application thereof.
Background
In the optical and optoelectronics fields, efforts have been made to develop optical delay lines. The optical delay line is a device capable of changing the optical path, and has wide application in the fields of terahertz time-domain spectroscopy (THz-TDS), optical Coherence Tomography (OCT), ultra-fast time resolution spectroscopy, optical pumping-detection technology and the like.
The conventional optical delay line is generally realized by driving a right angle reflecting prism by a stepping motor, and the right angle reflecting mirror moves back and forth when the light beam is reflected twice by the right angle reflecting mirror so as to change the optical path to realize optical delay. To increase the retardation, the optical path may be increased by a plurality of reflecting prisms. If the right angle prism shakes in the moving process, the reflected light beam and the incident light beam are still ensured to be parallel to each other in the horizontal plane, but the reflected light beam is not parallel to the incident light beam in the vertical plane any more, so that the coupling efficiency of the output light beam is reduced, and the light path stability is affected.
Therefore, how to solve the problem that the stability of the optical delay line is poor is needed to be solved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an optical delay device based on a reflecting lens and application thereof, and has high light path stability.
To achieve the above object, in a first aspect, the present invention provides a reflective lens-based optical delay line, including an input optical fiber collimator, an output optical fiber collimator, a first reflective lens group, and a second reflective lens group;
The first reflecting lens group comprises N-1 reflecting lenses which are arranged in an arrangement mode, the second reflecting lens group comprises N reflecting lenses which are arranged in an arrangement mode, the two reflecting lens groups are arranged in parallel, each reflecting lens in the first reflecting lens group is vertically projected onto one adjacent two reflecting lenses in the second reflecting lens group correspondingly, the convex surfaces of all the reflecting lenses in the two reflecting lens groups are oppositely arranged, the planes of all the reflecting lenses in the two reflecting lens groups are arranged in a back mode, and in the two reflecting lens groups, the convex surface focus balancing surface of each reflecting lens is on the plane of each reflecting lens; the interval distance between the two reflecting lens groups and the number of the reflecting lenses in the two reflecting lens groups are correspondingly adjusted according to the distance of optical delay required by the optical delay device;
When the optical fiber collimator works, light beams are emitted to the convex surface of the reflecting lens at one end part of the second reflecting lens group through the input optical fiber collimator, and are emitted to the output optical fiber collimator from the reflecting lens at the other end part of the second reflecting lens group after being refracted, reflected and reciprocated in one reflecting lens in the second reflecting lens group and the first reflecting lens group for N times.
The optical delay line based on the reflecting lenses adopts the two reflecting lens groups, and the convex surface of each reflecting lens in the two reflecting lens groups is on the plane of the same, so that when the light beam shakes, the reflected light beam is always parallel to the incident light beam in the horizontal plane and the vertical plane, the influence of the shake of the light beam on the coupling efficiency is small, the coupling efficiency of the output light beam can be effectively improved, and the light path stability is improved.
In one embodiment, the reflective surfaces of each of the two reflective lens groups are coated with a high reflectivity film matching the desired wavelength of reflected light.
In one embodiment, the optical system further comprises a driving component for changing the distance between the first and second reflective lens groups, thereby changing the propagation path of the optical beam.
In one embodiment, the second reflective lens is fixed on the driving part, and the first reflective lens is fixed by a fixing member.
In one embodiment, the drive member employs a stepper motor driver.
In one embodiment, the input fiber collimator is perpendicular to the plane of the reflective lens at one end of the first reflective lens group and the output fiber collimator is perpendicular to the plane of the reflective lens at the other end of the first reflective lens group.
In a second aspect, the present invention provides an application of the optical delay line based on a reflective lens in a terahertz time-domain spectroscopy system, an optical coherence tomography system, an ultrafast time-resolution spectroscopy system, and an optical pump-detection system.
Drawings
FIG. 1 is a schematic diagram of a reflective lens-based optical delay line according to an embodiment of the present invention;
FIG. 2 is a schematic view of the optical path of a reflective lens in the present invention;
FIG. 3 is an optical schematic of a reflective lens of the present invention for adjusting the beam waist position of a collimated beam by changing the position of the reflective surface;
fig. 4 is a schematic structural diagram of a reflective lens-based optical delay line according to another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In order to solve the problems of poor optical path stability, high cost and complex structure of the conventional optical delay line, the present invention provides an optical delay line based on a reflective lens, which includes an input optical fiber collimator 10, an output optical fiber collimator 20, a first reflective lens group 30 and a second reflective lens group 40 as shown in fig. 1.
The first reflective lens group 30 includes N-1 reflective lenses arranged in an array, and the second reflective lens group 40 includes N reflective lenses arranged in an array. The two reflection lens groups are arranged in parallel, each reflection lens in the first reflection lens group 30 is vertically projected onto one adjacent two reflection lenses in the second reflection lens group 40 correspondingly, the convex surfaces of all the reflection lenses in the two reflection lens groups are oppositely arranged, the planes of all the reflection lenses in the two reflection lens groups are oppositely arranged, and in the two reflection lens groups, the convex surfaces of all the reflection lenses are on the same focal plane.
In the optical delay line, a light beam (a dotted line in fig. 1) is incident on the convex surface of the reflecting lens at one end portion of the second reflecting lens group 40 after passing through the input optical fiber collimator 10, is reflected and refracted by the inside of the reflecting lens, and then is emitted to the convex surface of the reflecting lens at one end portion of the first reflecting lens group 30, is also reflected and refracted by the inside of the reflecting lens, is emitted to the convex surface of the other reflecting lens adjacent to the reflecting lens at one end portion of the second reflecting lens group 40, is reflected and reflected back and forth in one reflecting lens of the second reflecting lens group and the first reflecting lens group N times, and is emitted to the output optical fiber collimator 20 from the reflecting lens at the other end portion of the second reflecting lens group 40, thereby realizing time delay. Therefore, the distance between the two reflection lens groups and the number of the two reflection lens groups can be adjusted to further change the propagation path of the optical signal, so that the purpose of time delay of the optical signal is achieved.
Fig. 2 is a schematic view of an optical path of a reflective lens provided in the present embodiment, and as shown in fig. 2, the reflected light of the reflective lens provided in the present embodiment is always parallel to the incident light. When the incident light shakes, the incident angle changes slightly, and the reflection plane of the reflection lens is the object focal plane, so the reflected light can still be parallel to the incident light after refraction. In this process, the reflective lens first exhibits a beam focusing shaping effect, and then collimates the shaped beam.
The optical delay line based on the reflective lenses provided by the embodiment adopts the two reflective lens groups, and the convex surface of each reflective lens in the two reflective lens groups is on the plane thereof, so that when the light beam shakes, the reflected light beam is always parallel to the incident light beam in the horizontal plane and the vertical plane, the influence of the shake of the light beam on the coupling efficiency is small, the coupling efficiency of the output light beam can be effectively improved, and the light path stability is improved.
As shown in fig. 3, the focal length f of the reflective lens provided in the above embodiment changes to change the beam waist position l', which is expressed as follows:
where l is the initial beam waist position, Is the collimation distance of the beam, ω is the beam waist radius, and λ is the wavelength. Therefore, the focal length of the reflecting lens is changed, so that the beam waist of the light beam can be adjusted, the long-distance optical delay effect is achieved, and the influence of the light beam jitter on the delay effect can be effectively reduced.
The present invention will be described in detail with reference to the following examples:
as shown in fig. 4, the optical delay line structure provided in this embodiment includes a stepping motor driver, a movable reflection lens group 50, a fixed reflection lens group 60, an input optical fiber collimator 10, and an output optical fiber collimator 20.
The movable reflective lens group 50 is fixed on the driving component, specifically, may be fixed on the stepper motor driver, and the fixed reflective lens group 60 may be fixed in the installation position by using a common fixing piece. The reflecting surfaces of the reflecting lenses in the movable reflecting lens group 50 and the fixed reflecting lens group 60 are rear reflecting planes, the rear end surfaces are high-reflectivity films with the required wavelength matching of the reflected light, the convex focal surfaces are on the rear reflecting planes, the geometric parameters of the convex focal surfaces are consistent with each other, and the convex focal surfaces are arranged in the mode shown in fig. 4, when the movable reflecting lens group 50 and the fixed reflecting lens group 40 are arranged, the reflecting planes of the movable reflecting lens group 50 and the fixed reflecting lens group 40 need to be ensured to be parallel as much as possible, and the input optical fiber collimator 10 and the output optical fiber collimator 20 need to be perpendicular to the reflecting planes of the reflecting lens groups.
The optical delay line provided in this embodiment, the light beam enters one of the reflective lenses in the movable reflective lens group 50 after entering the optical fiber collimator 10, and exits to one of the reflective lenses in the fixed reflective lens group 60 after being refracted and reflected by the rear end surface, and the optical path length of the light beam for N round trips in the device is changed while the stepper motor driver moves, so as to realize time delay; in addition, the coupling efficiency of the input fiber collimator and the output fiber collimator in this embodiment is related to the beam waist radius of the gaussian beam, and the beam is shaped while passing N times in the movable reflective lens group 50 and the fixed reflective lens group 60 based on the related properties of the reflective lenses, so that the overall device has higher inclusion.
In addition, the invention also provides application of the optical delay line based on the reflecting lens in a terahertz time-domain spectroscopy system, an optical coherence tomography system, an ultrafast time-resolution spectroscopy system and an optical pumping-detecting system, and the following description is given by taking the application of the optical delay line in the terahertz time-domain spectroscopy system as an example:
The other principles are the same as typical terahertz time-domain spectroscopy systems except for the optical delay line section. The movable reflective lens group 60 is composed of N reflective lenses, the fixed reflective lens group 50 is composed of N-1 reflective lenses, the distance moved by the stepper motor driver in time t 0 is L 0, the size of the reflective prism is ignored, the scanning range of the optical delay line is L t＝N·L0, and the time delay is Is N times the current optical delay line, where c is the speed of light. By changing the number of reflective lenses, the amount of retardation of the system can be further changed.
In summary, the assembly mode and the specific structure of the optical delay line pair reflective lens provided in the embodiment are designed, and under the condition that the moving speed of the stepper motor driver is unchanged, the embodiment can realize a faster scanning time and a larger scanning range; in addition, the dithering of the light beam in the embodiment has small influence on the coupling efficiency of the system, the light beam can be shaped for multiple times in the reflecting lens, and the working efficiency of the device is improved.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (7)
1. An optical delay line based on a reflecting lens is characterized by comprising an input optical fiber collimator, an output optical fiber collimator, a first reflecting lens group and a second reflecting lens group;
The first reflecting lens group comprises N-1 reflecting lenses which are arranged in an arrangement mode, the second reflecting lens group comprises N reflecting lenses which are arranged in an arrangement mode, the two reflecting lens groups are arranged in parallel, each reflecting lens in the first reflecting lens group is vertically projected onto one adjacent two reflecting lenses in the second reflecting lens group correspondingly, the convex surfaces of all the reflecting lenses in the two reflecting lens groups are oppositely arranged, the planes of all the reflecting lenses in the two reflecting lens groups are arranged in a back mode, and in the two reflecting lens groups, the convex surface focus balancing surface of each reflecting lens is on the plane of each reflecting lens; the interval distance between the two reflecting lens groups and the number of the reflecting lenses in the two reflecting lens groups are correspondingly adjusted according to the distance of optical delay required by the optical delay device;
When the optical fiber collimator works, light beams are emitted to the convex surface of the reflecting lens at one end part of the second reflecting lens group through the input optical fiber collimator, and are emitted to the output optical fiber collimator from the reflecting lens at the other end part of the second reflecting lens group after being refracted, reflected and reciprocated in one reflecting lens in the second reflecting lens group and the first reflecting lens group for N times.
2. The reflective lens-based optical delay line of claim 1, wherein the reflective plane of each reflective lens in both reflective lens groups is coated with a high reflectivity film matching the desired wavelength of reflected light.
3. The reflective lens based optical delay line of claim 1, further comprising a driving means for varying a distance between the first reflective lens group and the second reflective lens group, thereby varying a propagation path of the light beam.
4. A reflective lens based optical delay line as recited in claim 3, wherein said second reflective lens is fixed to said driving member and said first reflective lens is fixed by a fixing member.
5. The reflective lens based optical delay line of claim 3 or 4, wherein the driving means employs a stepper motor driver.
6. The reflective lens based optical delay line of claim 1 wherein the input fiber collimator is perpendicular to the plane of the reflective lens at one end of the first reflective lens group and the output fiber collimator is perpendicular to the plane of the reflective lens at the other end of the first reflective lens group.
7. Use of the reflection-lens-based optical delay line according to any one of claims 1 to 6 in terahertz time-domain spectroscopy systems, optical coherence tomography systems, ultra-fast time-resolution spectroscopy systems and optical pump-detection systems.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211332813.1A CN115685529B (en) | 2022-10-28 | 2022-10-28 | Optical delay line based on reflecting lens and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211332813.1A CN115685529B (en) | 2022-10-28 | 2022-10-28 | Optical delay line based on reflecting lens and application thereof |
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| Publication Number | Publication Date |
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| CN115685529A CN115685529A (en) | 2023-02-03 |
| CN115685529B true CN115685529B (en) | 2024-08-27 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6147799A (en) * | 1999-10-08 | 2000-11-14 | Agilent Technologies Inc. | Physically compact variable optical delay element having wide adjustment range |
| CN111158139A (en) * | 2020-02-22 | 2020-05-15 | 中国工程物理研究院流体物理研究所 | Ultra-high-speed rotating prism optical fiber delay line for real-time terahertz medical imaging |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007528613A (en) * | 2004-03-09 | 2007-10-11 | レンゼラー ポリテクニック インスティテュート | High repetition rate linear real-time optical delay line. |
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- 2022-10-28 CN CN202211332813.1A patent/CN115685529B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6147799A (en) * | 1999-10-08 | 2000-11-14 | Agilent Technologies Inc. | Physically compact variable optical delay element having wide adjustment range |
| CN111158139A (en) * | 2020-02-22 | 2020-05-15 | 中国工程物理研究院流体物理研究所 | Ultra-high-speed rotating prism optical fiber delay line for real-time terahertz medical imaging |
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| CN115685529A (en) | 2023-02-03 |
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