CN104538825A - Method for detecting stability of mode locking signals in self-starting process of fiber laser - Google Patents
Method for detecting stability of mode locking signals in self-starting process of fiber laser Download PDFInfo
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- CN104538825A CN104538825A CN201510015605.2A CN201510015605A CN104538825A CN 104538825 A CN104538825 A CN 104538825A CN 201510015605 A CN201510015605 A CN 201510015605A CN 104538825 A CN104538825 A CN 104538825A
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Abstract
The invention discloses a method for detecting stability of mode locking signals in the self-starting process of a fiber laser. The method filters out signals with poor stability in the mode locking state by dynamically adjusting the comparative level, so that seed source signals with high stability are screened out. A high-speed comparator is additionally arranged in a feedback circuit, a threshold level can be dynamically adjusted by an FPGA, the repetition frequency of pulse signals can be recognized, and the amplitude jitter range of optical signals can be accurately judged. By adopting the method of dynamically adjusting the comparative level, the unstable mode locking state is filtered out by setting the proper range, the problem that in the prior art, the unstable mode locking state can not bye recognized only by depending on judging the mode locking state under the condition of nonadjustable comparative level is solved, it is ensured that the laser can accurately find the mode locking state with high stability in the self-starting stage, and the whole performance of the laser is also improved.
Description
Technical field
The present invention relates to femto second optical fiber laser class, belong to laser technology field.Specifically in the process of the automatic locked mode of femto second optical fiber laser, provide a kind of method that can detect seed source signal amplitude stability, this method can in locked mode self-starting process the mode-lock status of effective filtering instability, pick out the state that stability is good, strengthen the reliability of self-starting process, improve the overall performance of femto second optical fiber laser.
Background technology
Ultrafast laser technique is an important branch of optics field, wherein femtosecond pulse has high peak power and time resolved, is widely used in the fields such as optical microphotograph imaging, Terahertz generation, nonlinear effect, laser ranging, retrofit, biologic medical.
It is all rely on solid state laser, such as most widely used ti sapphire laser that traditional femtosecond laser produces.But this kind of laser all adopts spatial light structure, involve great expense and safeguard complexity, having quite high requirement to environment for use, being therefore mainly used in laboratory environment.By contrast, femto second optical fiber laser adopts optical fiber structure to realize generation and the amplification of laser, there is the characteristic of low cost and high stability, solid state laser can be substituted in a lot of fields, and show particularly evident superiority in industrial application such as Precision Machining, therefore become research and development in recent years and application focus.
An important technology in femtosecond fiber laser system is automatic mode-locking technique, wherein a kind of effective means adopt polarization to rotate to realize automatic locked mode, specific practice adds an automatically controlled Polarization Controller EPC in annular chamber, by regulating the voltage extruding optical fiber of EPC, the polarization state in loop and refractive index can be changed, by detecting amplitude and the frequency of output signal, forming feedback loop, finally realizing locked mode and exporting.To the detection of output optical signal, photodiode is normally adopted to transfer light signal to the signal of telecommunication, when mode-lock status occurs, the cyclic pulse signal of a specific repetition rate (this frequency values and chamber long about) can be produced, this signal is sent into counter, as count results meets setting result, namely think that locked mode is successful.
Because an annular chamber has multiple mode-lock status usually, and these states have dividing of quality: good mode-lock status frequency stabilization, and amplitude jitter is little; And bad mode-lock status amplitude jitter is larger.The method of above-mentioned direct-detection cannot differentiate the amplitude jitter of mode-lock status, therefore the Output rusults of this detection mode can comprise the larger mode-lock status of amplitude jitter, the spectrum of the usual corresponding non-gaussian type of this situation, is unfavorable for the broadening of rear class, compression and amplification.
Summary of the invention
The object of the invention is the method causing accurately identifying the mode-lock status of high stability and the mode-lock status of a kind of novel identification high stability proposed for laser in automatic locking mold process because comparative level is non-adjustable, the method use dynamic adjustment comparative level value to filter out the poor signal of mode-lock status stability inferior, thus filter out the seed source signal of high stability.Add a high-speed comparator in the feedback loop, and its threshold level can pass through field programmable gate array (FPGA) dynamic adjustments, not only can tell the repetition rate of pulse signal, and the amplitude jitter scope of light signal can be judged accurately, by setting suitable interval, current method due to comparative level unadjustable, as long as the waveform on comparative level all can be counted device and count on, but the waveform of amplitude instability cannot be identified, and judge that the method for mode-lock status also goes out unstable mode-lock status with regard to None-identified according to count value, and adopt dynamic conditioning comparative level, then can head it off, find the mode-lock status of high stability accurately.
The object of the present invention is achieved like this:
In fiber laser self-starting process, detect a method for mode-locked signal stability, the method comprises following concrete steps:
A, first carry out manual lock mould, then set comparative level value in 50% of mode-locked signal amplitude, and the pulse signal exported more afterwards is counted, and therefrom filter out the correct signal of seed source signal frequency counting count_max;
B, adjustment comparative level value, and the pulse signal exported more afterwards is counted, if signal pulse number is now less than 90% of count_max, then reduce comparative level value; If pulse signal number is now greater than 90% of count_max, then increase comparative level value, so repeatedly, until when the pulse number exported is 90% of count_max, the comparative level value compare_lever_90percent that record is corresponding;
C, adjustment comparative level value, and the pulse signal exported more afterwards is counted, if signal pulse number is now less than 10% of count_max, then reduce comparative level value; If pulse signal number is now greater than 10% of count_max, then increase comparative level value, so repeatedly, until when the pulse number exported is 10% of count_max, the comparative level value compare_lever_10percent that record is corresponding;
D, the comparative level value (compare_lever_10percent) of the counting correspondence of 10% is deducted the comparative level value (compare_lever_90percent) of the counting correspondence of 90%, if difference is in certain scope, then think that the signal stabilization under this mode-lock status is relatively good, otherwise think that this mode-lock status is bad, directly abandon.
Beneficial effect of the present invention:
The present invention adopts the mode-lock status of the method filtering instability of dynamic conditioning comparative level, solve only to rely at present and judge that mode-lock status count value in uncontrollable comparative level situation and None-identified go out the problem of the mode-lock status of instability, ensure that laser can find the mode-lock status of high stability accurately in the self-starting stage, also improve the overall performance of laser simultaneously.
Accompanying drawing explanation
Fig. 1 is comparative level of the present invention adjustment schematic diagram;
Fig. 2 is that the present invention finds comparative level B point and C point flow chart.
Embodiment
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that the understanding of technical staff of the same trade.
Embodiment
Consult Fig. 1, in figure:
(1), comparative level is set in A point: after laser start, first comparative level is set in a lower value (A point), then carries out scanning the X-axis of EPC, Y-axis and Z axis, obtains the waveform of laser seed source signal frequency counting in correct scope;
, level export more afterwards 90% waveform: the value repeatedly adjusting comparative level for the waveform (1) obtained, the counted number of pulses that level is exported more afterwards is about 90% of the step-by-step counting of the precision waveform (1) thought, then set this point for B point;
, level export more afterwards 10% waveform: the value repeatedly adjusting comparative level for the waveform (1) obtained, the counted number of pulses that level is exported more afterwards is about 10% of the step-by-step counting of the precision waveform (1) thought, then set this point for C point;
(4), the difference of B point comparative level and C point comparative level: the comparative level of the C point that (3) comparative level of the B point that (2) step is obtained and step obtain subtracts each other, if difference is within the scope of 10% of waveforms amplitude, thinks that this mode-lock status waveform comparison is stablized, otherwise directly abandon.
Consult Fig. 2:
Automatic-searching comparative level B point flow process: first initializing set comparative level value, then to level relatively after pulse count, if counted number of pulses is comparative level in about 90% of the step-by-step counting of the precision waveform of A point, then setting this point is B point; Otherwise readjust comparative level value, again count, so repeatedly, until satisfy condition;
Automatic-searching comparative level C point flow process: first initializing set comparative level value, then to level relatively after pulse count, if counted number of pulses is comparative level in about 10% of the step-by-step counting of the precision waveform of A point, then setting this point is C point; Otherwise readjust comparative level value, again count, so repeatedly, until satisfy condition.
Claims (1)
1. in fiber laser self-starting process, detect a method for mode-locked signal stability, it is characterized in that the method comprises following concrete steps:
A, first carry out manual lock mould, then set comparative level value in 50% of mode-locked signal amplitude, and the pulse signal exported more afterwards is counted, and therefrom filter out the correct signal of seed source signal frequency counting count_max;
B, adjustment comparative level value, and the pulse signal exported more afterwards is counted, if signal pulse number is now less than 90% of count_max, then reduce comparative level value; If pulse signal number is now greater than 90% of count_max, then increase comparative level value, so repeatedly, until when the pulse number exported is 90% of count_max, the comparative level value compare_lever_90percent that record is corresponding;
C, adjustment comparative level value, and the pulse signal exported more afterwards is counted, if signal pulse number is now less than 10% of count_max, then reduce comparative level value; If pulse signal number is now greater than 10% of count_max, then increase comparative level value, so repeatedly, until when the pulse number exported is 10% of count_max, the comparative level value compare_lever_10percent that record is corresponding;
D, the comparative level value of the counting correspondence of 10% deducted the comparative level value of the counting correspondence of 90%, if difference is in certain scope, then think that the signal stabilization under this mode-lock status is relatively good, otherwise think that this mode-lock status is bad, directly abandon.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410587A (en) * | 2016-11-30 | 2017-02-15 | 中国科学院国家授时中心 | Mode-locked state detecting device and method for femto second fiber laser |
| CN106451053A (en) * | 2016-08-17 | 2017-02-22 | 北京无线电计量测试研究所 | Mode-locked state detection method and device |
| CN112271546A (en) * | 2020-10-12 | 2021-01-26 | 北京卓镭激光技术有限公司 | Laser, mode locking state monitoring method and device |
| CN112290365A (en) * | 2020-10-12 | 2021-01-29 | 北京卓镭激光技术有限公司 | Laser, mode locking method and device |
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| US6845108B1 (en) * | 2001-05-14 | 2005-01-18 | Calmar Optcom, Inc. | Tuning of laser wavelength in actively mode-locked lasers |
| CN103227406A (en) * | 2013-04-28 | 2013-07-31 | 陈国梁 | Passive mode-locking optical fiber laser device |
| CN203150898U (en) * | 2013-04-01 | 2013-08-21 | 北京铟尼镭斯技术有限公司 | Automatic mode-locking device provided with optical fiber laser |
| CN104242022A (en) * | 2014-09-26 | 2014-12-24 | 天津大学 | Real-time monitoring, warning and handling system of mode-locked laser status |
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2015
- 2015-01-13 CN CN201510015605.2A patent/CN104538825A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6845108B1 (en) * | 2001-05-14 | 2005-01-18 | Calmar Optcom, Inc. | Tuning of laser wavelength in actively mode-locked lasers |
| CN203150898U (en) * | 2013-04-01 | 2013-08-21 | 北京铟尼镭斯技术有限公司 | Automatic mode-locking device provided with optical fiber laser |
| CN103227406A (en) * | 2013-04-28 | 2013-07-31 | 陈国梁 | Passive mode-locking optical fiber laser device |
| CN104242022A (en) * | 2014-09-26 | 2014-12-24 | 天津大学 | Real-time monitoring, warning and handling system of mode-locked laser status |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451053A (en) * | 2016-08-17 | 2017-02-22 | 北京无线电计量测试研究所 | Mode-locked state detection method and device |
| CN106451053B (en) * | 2016-08-17 | 2019-01-22 | 北京无线电计量测试研究所 | A kind of detection method and equipment of mode-lock status |
| CN106410587A (en) * | 2016-11-30 | 2017-02-15 | 中国科学院国家授时中心 | Mode-locked state detecting device and method for femto second fiber laser |
| CN112271546A (en) * | 2020-10-12 | 2021-01-26 | 北京卓镭激光技术有限公司 | Laser, mode locking state monitoring method and device |
| CN112290365A (en) * | 2020-10-12 | 2021-01-29 | 北京卓镭激光技术有限公司 | Laser, mode locking method and device |
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Application publication date: 20150422 |