CN109412010B - Method for prolonging mean time between failures of laser frequency stabilization system - Google Patents
Method for prolonging mean time between failures of laser frequency stabilization system Download PDFInfo
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- CN109412010B CN109412010B CN201811536296.3A CN201811536296A CN109412010B CN 109412010 B CN109412010 B CN 109412010B CN 201811536296 A CN201811536296 A CN 201811536296A CN 109412010 B CN109412010 B CN 109412010B
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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
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
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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
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/06808—Stabilisation of laser output parameters by monitoring the electrical laser parameters, e.g. voltage or current
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Abstract
The invention discloses a method for prolonging the mean time between failures of a laser frequency stabilization system, which samples a locking voltage value output by a PI control unit in the laser automatic frequency stabilization system, and when the voltage exceeds a threshold value, the locking voltage value slowly returns to the central value of the action range of the locking voltage value by adjusting the current value output to a laser tube.
Description
Technical Field
The invention belongs to the field of laser automatic frequency stabilization, and particularly relates to a method for prolonging the mean time between failures of a laser frequency stabilization system.
Background
The laser plays an important role in systems of quantum optics, quantum information and cold atom physics, and in order to reduce the drift of the laser and make the laser play a better role, the frequency of the laser is often required to be locked on a certain reference standard, so that a laser source with stable wavelength is obtained. However, in the existing laser automatic frequency stabilization system, due to the parameter drift of the physical system, the change of the system operating point, and the like, the control voltage required for locking the laser automatic frequency stabilization system exceeds the action range of the PI (proportional integral) control unit, so that the failure of the lock losing of the laser automatic frequency stabilization system occurs, and the normal use is seriously affected, and therefore, a method for prolonging the average non-failure operating time of the laser frequency stabilization system needs to be provided.
Disclosure of Invention
The invention aims to overcome the defects and provide a method for prolonging the mean time between failures of a laser frequency stabilization system, which can prolong the mean time between failures of the laser automatic frequency stabilization system.
In order to achieve the above object, the present invention comprises the steps of:
step one, a PI control unit in a laser automatic frequency stabilization system locks the wavelength of a laser on a physical reference;
sampling and outputting a locking voltage Vc output by the PI control unit by adopting an AD converter;
step three, the operation control unit judges whether the deviation amount of the locking voltage Vc output by the PI control unit from the central value Vm exceeds a threshold Vh in real time according to the output data of the AD converter;
if the deviation amount of the locking voltage Vc from Vm exceeds the threshold Vh, calculating the change amount delta I required by the driving current of the laser tube, and entering the fourth step;
if the deviation amount of the locking voltage Vc from Vm does not exceed the threshold Vh, entering a fifth step;
step four, controlling the laser tube to output the delta I in n steps, so that the value of the locking voltage Vc gradually returns to the central value;
and step five, repeating the step two to the step four to ensure that the laser automatic frequency stabilizing system always works in a stable state.
In the second step, the AD converter adopts a 16-bit resolution AD converter.
In step three, the change Δ I is calculated as follows:
ΔI＝k×(Vc-Vm)
and k is a proportionality coefficient between the locking voltage and the driving current of the laser tube.
In step four, the calculation formula of n is as follows:
wherein Isp is the maximum step value of the single output change of the laser tube driving current.
Compared with the prior art, the locking voltage value output by the PI control unit in the laser automatic frequency stabilization system is sampled, and when the voltage exceeds the threshold value, the locking voltage value slowly returns to the central value of the action range of the laser tube by adjusting the current value output to the laser tube.
Drawings
FIG. 1 is a control block diagram of the present invention;
FIG. 2 is a flow chart of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 and 2, the present invention includes the steps of:
step one, a PI control unit in a laser automatic frequency stabilization system locks the wavelength of a laser on a physical reference;
sampling and outputting the locking voltage Vc output by the PI control unit by using an AD converter, wherein the AD converter adopts a 16-bit resolution AD converter;
step three, the operation control unit judges whether the deviation amount of the locking voltage Vc output by the PI control unit from the central value Vm exceeds a threshold Vh in real time according to the output data of the AD converter;
ΔI＝k×(Vc-Vm)
k is a proportionality coefficient between the locking voltage and the driving current of the laser tube;
if the deviation amount of the locking voltage Vc from Vm exceeds the threshold Vh, calculating the change amount delta I required by the driving current of the laser tube, and entering the fourth step;
if the deviation amount of the locking voltage Vc from Vm does not exceed the threshold Vh, entering a fifth step;
step four, controlling the laser tube to output the delta I in n steps, so that the value of the locking voltage Vc gradually returns to the central value;
wherein the Isp is the maximum step value of the single output change amount of the laser tube driving current;
and step five, repeating the step two to the step four to ensure that the laser automatic frequency stabilizing system always works in a stable state.
Example (b):
1) a PI control unit in the laser automatic frequency stabilization system locks the wavelength of a laser on a physical reference;
2) sampling the locking voltage Vc output by the PI control unit in the step 1) by using an AD converter with 16-bit resolution;
3) and judging whether the deviation amount of the locking voltage Vc from Vm output by the PI control unit exceeds a threshold Vh in real time according to the output data of the AD converter in the step 2).
Where Vm is the center value of the PI control unit output voltage range, 2.5V in this example system; vh is a threshold value of a deviation Vm of a locking voltage set for ensuring stable operation of the laser automatic frequency stabilization system, and is set to be 1V in the system of the embodiment;
4) if the amount of deviation Vm of the locking voltage Vc of the step 3) exceeds the threshold Vh, the required change amount Delta I of the drive current of the laser tube is calculated.
Δ I is calculated as: Δ I ═ k × (Vc-Vm)
Where k is the proportionality coefficient between the locking voltage and the drive current of the laser tube, 100 μ A/V in this embodiment system.
5) Outputting the delta I in n steps to ensure that the value of the locking voltage Vc gradually returns to the central value;
where n is a positive integer, the formula for n is:
i.e. the ratio of the absolute value of Δ I to Isp is integrated and then 1 is added. Where Isp is the maximum step value of a single output change in the laser tube drive current, Isp is set to 10 μ a in this embodiment system.
Assuming that Vc is 3.63V, Δ I is 113 μ a, and n is 12. That is, Δ I is 113 μ A, and is output through 12 steps.
6) And (5) repeating the step 2) to the step 5), and ensuring that the laser automatic frequency stabilizing system always works in a stable state.
Experiments show that when a laser driving current automatic tracking method is not adopted, the average failure-free time of the laser automatic frequency stabilization system is only about 110 hours; after the current automatic tracking method for prolonging the fault-free working time of the laser automatic frequency stabilization system is adopted, the average fault-free time of the laser automatic frequency stabilization system is improved to 10000 hours.
Claims (2)
1. A method for prolonging the mean time between failures of a laser frequency stabilization system is characterized by comprising the following steps:
step one, a PI control unit in a laser automatic frequency stabilization system locks the wavelength of a laser on a physical reference;
sampling and outputting a locking voltage Vc output by the PI control unit by adopting an AD converter;
step three, the operation control unit judges whether the deviation amount of the locking voltage Vc output by the PI control unit from the central value Vm exceeds a threshold Vh in real time according to the output data of the AD converter; the change amount Δ I is calculated as follows:
ΔI＝k×(Vc-Vm)
k is a proportionality coefficient between the locking voltage and the driving current of the laser tube;
if the deviation amount of the locking voltage Vc from Vm exceeds the threshold Vh, calculating the change amount delta I required by the driving current of the laser tube, and entering the fourth step;
if the deviation amount of the locking voltage Vc from Vm does not exceed the threshold Vh, entering a fifth step;
step four, controlling the laser tube to output the delta I in n steps, so that the value of the locking voltage Vc gradually returns to the central value; the formula for n is as follows:
wherein the Isp is the maximum step value of the single output change amount of the laser tube driving current;
and step five, repeating the step two to the step four to ensure that the laser automatic frequency stabilizing system always works in a stable state.
2. The method of claim 1, wherein in step two, the AD converter is a 16-bit resolution AD converter.
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| CN111781790B (en) * | 2019-04-04 | 2022-12-23 | 中强光电股份有限公司 | Electronic device and laser unit protection method |
| CN112260057B (en) * | 2020-09-23 | 2021-11-26 | 北京无线电计量测试研究所 | Calcium atomic beam optical frequency scale detection light automatic locking method |
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| CN1285147C (en) * | 2004-11-12 | 2006-11-15 | 中国科学院武汉物理与数学研究所 | A phase-lock laser frequency stabilization method |
| JP5032451B2 (en) * | 2007-12-28 | 2012-09-26 | 住友電工デバイス・イノベーション株式会社 | Wavelength tunable laser test method, wavelength tunable laser control method, and laser apparatus |
| US8175126B2 (en) * | 2008-10-08 | 2012-05-08 | Telaris, Inc. | Arbitrary optical waveform generation utilizing optical phase-locked loops |
| CN102801100B (en) * | 2012-07-23 | 2014-07-30 | 江汉大学 | Device for improving output frequency stability of laser and laser with device |
| CN202840234U (en) * | 2012-07-23 | 2013-03-27 | 江汉大学 | Frequency regulator for improving short-term stability of laser |
| CN104409960B (en) * | 2014-11-26 | 2017-08-11 | 山西大学 | A kind of automatic laser frequency regulator and method |
| CN205282870U (en) * | 2015-11-27 | 2016-06-01 | 武汉理工光科股份有限公司 | Laser device constant current source drive circuit |
| CN206498088U (en) * | 2016-10-25 | 2017-09-15 | 中国科学院福建物质结构研究所 | A kind of modulation-free frequency stabilizer of semiconductor laser |
| CN106451059A (en) * | 2016-11-21 | 2017-02-22 | 中国电子科技集团公司第四十四研究所 | Control method and control device for single-mode stability of laser |
| CN207082716U (en) * | 2017-05-24 | 2018-03-09 | 深圳联品激光技术有限公司 | A kind of ring cavity optical laser system |
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