CN108155540A - A kind of detecting system of single-frequency laser mode hopping - Google Patents
A kind of detecting system of single-frequency laser mode hopping Download PDFInfo
- Publication number
- CN108155540A CN108155540A CN201711464575.9A CN201711464575A CN108155540A CN 108155540 A CN108155540 A CN 108155540A CN 201711464575 A CN201711464575 A CN 201711464575A CN 108155540 A CN108155540 A CN 108155540A
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- coupler
- frequency laser
- optical fiber
- mode hopping
- photodetector
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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
- H01S3/0014—Monitoring arrangements not otherwise provided for
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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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
- H01S5/0014—Measuring characteristics or properties thereof
Abstract
The present invention relates to a kind of detecting systems of single-frequency laser mode hopping, including optoisolator, fibre optic interferometer, photodetector and oscillograph, the fibre optic interferometer includes the first coupler, the second coupler, Transmission Fibers and time delay optical fiber, the input terminal of first coupler is connected by optical fiber with single-frequency laser, and the output terminal of second coupler is connected by optical fiber with photodetector；The Transmission Fibers and time delay optical fiber are connected in parallel between the first coupler and the second coupler so that the output light of single-frequency laser forms interference；The oscillograph is connected with photodetector.The present invention can detect in real time, and of low cost be easily achieved.
Description
Technical field
The present invention relates to single-frequency laser field, more particularly to a kind of detecting system of single-frequency laser mode hopping.
Background technology
Single-frequency laser has become the perfect light source of various optical detections because it is with performances such as narrow linewidth, low noises,
Single-frequency laser is widely used in that coherent light communication, laser radar, laser remote sensing, laser is intercepted and high-resolution spectroscopy
The fields of grade.At present, the production process technology of single-frequency laser reaches its maturity, but in practical applications, and single-frequency laser is long
Still can occur Mode-hopping Phenomena once in a while in time operation, mode hopping will seriously affect the high coherence of monochromatic sources, and increase laser
The phase noise of device, this generates serious restrict to the extensive use of single-frequency laser.The mode hopping of single-frequency laser is carried out real-time
Detection is the important means of unavoidable major issue and evaluation single-frequency laser performance in single-frequency laser research.
Current existing longitudinal mode detection method has intensity noise method, F-P interferometer scanning method methods, from self-homodyning method etc..
Intensity noise method detection result is convenient and can detect in real time, but is easily judged by accident with other noise aliasings, generation.
F-P interferometer scanning methods are a kind of common mode hopping detection methods, and mode hopping is realized by directly scanning F-P cavity
Detection, and can determine whether the frequency displacement direction and interval of mode hopping, but scanning spectral range is limited, the scan period is long, and can not ensure
Detection in real time.
Mode hopping is judged by the beat signal generated during detection pattern saltus step from self-homodyning method, is measuring single-frequency
The line width of laser can judge the frequency displacement of single-frequency laser and mode hopping characteristic, and can be accurate by detecting beat signal simultaneously
Detection mode hopping frequency displacement and interval, disadvantage be that test system usually requires the delay optical fiber using tens kilometers, test knot
The stability and accuracy of fruit are poor, and test system structure is complicated.
Invention content
The technical problems to be solved by the invention are to provide a kind of detecting system of single-frequency laser mode hopping, can examine in real time
It surveys, and of low cost is easily achieved.
The technical solution adopted by the present invention to solve the technical problems is：A kind of detection system of single-frequency laser mode hopping is provided
System, including fibre optic interferometer, photodetector and oscillograph, the fibre optic interferometer include the first coupler, the second coupler,
Transmission Fibers and time delay optical fiber, the input terminal of first coupler are connected by optical fiber with single-frequency laser, second coupling
The output terminal of clutch is connected by optical fiber with photodetector；The Transmission Fibers and time delay optical fiber be connected in parallel on the first coupler and
So that the output light of single-frequency laser forms interference between second coupler；The oscillograph is connected with photodetector.
Optoisolator is additionally provided between first coupler and single-frequency laser.
The fibre optic interferometer is placed in shock insulation sound insulation thermostat.
The photodetector is photodiode detector.
Advantageous effect
As a result of above-mentioned technical solution, compared with prior art, the present invention having the following advantages that and actively imitating
Fruit：
The present invention can observe the situation of change of single-frequency laser mode hopping by oscillograph in real time, and precision is high, and passes through letter
It is single to calculate the frequency displacement size that immediately arrive at mode hopping.
High sensitivity of the present invention has higher resolving power to mode hopping detection, interferes compared to intensity noise method, F-P
Instrument scanning method, from self-homodyning method, detecting system provided by the invention is of simple structure and low cost and easy realization and can be real-time
Detection.
Description of the drawings
Fig. 1 is the structure diagram of the present invention；
Fig. 2 is fibre optic interferometer free spectral range figure in embodiment of the present invention.
Specific embodiment
With reference to specific embodiment, the present invention is further explained.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, people in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Range.
Embodiments of the present invention are related to a kind of detecting system of single-frequency laser mode hopping, including fibre optic interferometer, photoelectricity
Detector and oscillograph, the fibre optic interferometer include the first coupler, the second coupler, Transmission Fibers and time delay optical fiber, institute
The input terminal for stating the first coupler is connected by optical fiber with single-frequency laser, the output terminal of second coupler by optical fiber with
Photodetector is connected；The Transmission Fibers and time delay optical fiber are connected in parallel between the first coupler and the second coupler so that single-frequency
The output light of laser forms interference；The oscillograph is connected with photodetector.
Present embodiment is the Detection Techniques based on fibre optic interferometer and photodiode, by detecting oscillograph voltage
Situation of change carrys out the mode hopping characteristic of detection fiber laser, and fibre optic interferometer is more demanding to shaking, if fibre optic interferometer shakes
Amplitude is excessive, will seriously reduce the accuracy of detection of the detecting system.
In order to realize the detection to single mode fiber laser mode hopping characteristic, as shown in Figure 1, the inspection of the single-frequency laser mode hopping
Examining system is made of optoisolator 1, fibre optic interferometer, shock insulation sound insulation thermostat 8, photodetector 6 and oscillograph 7.
Wherein, optoisolator 2, for controlling return loss, avoids back between single-frequency laser 1 and fibre optic interferometer
Wave generates damage to single-frequency laser 1；
Fibre optic interferometer is formed by including the first coupler 3, the second coupler 5, Transmission Fibers and time delay optical fiber 4, described
The input terminal of first coupler 3 is connected by optical fiber with optoisolator 2 and single-frequency laser 1 successively, second coupler 5
Output terminal is connected by optical fiber with photodetector 6；The Transmission Fibers and time delay optical fiber 4 are connected in parallel on the first coupler 3 and
So that the output light of single-frequency laser 1 forms interference between two couplers 5, the fibre optic interferometer is placed on a shock insulation sound insulation
In thermostat 8, to eliminate interference of the extraneous environmental noise to interferometer.Wherein, photodetector 6 is detected for photodiode
Device.
Single-frequency laser 1 sends out light successively by optoisolator 2, fibre optic interferometer, is generated after fibre optic interferometer
Interference light signal enters photodetector 6 and switchs to voltage signal, and voltage signal is connected on oscillograph 7 and is observed.
When not having patterns of change, the voltage signal observed on oscillograph 7 is smoother curve, when there is mode hopping
When, there is saltus step in voltage signal on oscillograph, and the situation of saltus step can reflect frequency displacement direction and the size of mode hopping.Fibre optic interferometer
Free spectral range range can be obtained by calculation, and free spectral range is referring to Fig. 2.By the size for observing oscillograph voltage jump
The size of single-frequency laser mode hopping frequency variation can be calculated.
In conclusion the present invention, by the use of single-frequency laser to be measured as light source, emergent light is sent out after by fibre optic interferometer
Raw interference, the interference light of generation are received by a photoelectric detector and are converted into voltage signal.Saltus step can be observed in real time on oscillograph
The situation of change of voltage, so as to obtain the frequency displacement direction of mode hopping and frequency displacement size.
It is not difficult to find that the present invention can observe the situation of change of single-frequency laser mode hopping by oscillograph in real time, precision is high, and
And the frequency displacement size of mode hopping can be immediately arrived at by simple computation.High sensitivity of the present invention, to mode hopping detection with higher point
Distinguish ability, compared with the prior art, detecting system provided by the invention it is of simple structure and low cost and it is easy realization and can be real-time
Detection.
Claims (4)
1. a kind of detecting system of single-frequency laser mode hopping, including fibre optic interferometer, photodetector and oscillograph, feature exists
In the fibre optic interferometer includes the first coupler, the second coupler, Transmission Fibers and time delay optical fiber, first coupler
Input terminal be connected by optical fiber with single-frequency laser, the output terminal of second coupler passes through optical fiber and photodetector phase
Even；The Transmission Fibers and time delay optical fiber are connected in parallel between the first coupler and the second coupler the output so that single-frequency laser
Light forms interference；The oscillograph is connected with photodetector.
2. the detecting system of single-frequency laser mode hopping according to claim 1, which is characterized in that first coupler and
Optoisolator is additionally provided between single-frequency laser.
3. the detecting system of single-frequency laser mode hopping according to claim 1, which is characterized in that the fibre optic interferometer is put
It puts in shock insulation sound insulation thermostat.
4. the detecting system of single-frequency laser mode hopping according to claim 1, which is characterized in that the photodetector is
Photodiode detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711464575.9A CN108155540A (en) | 2017-12-28 | 2017-12-28 | A kind of detecting system of single-frequency laser mode hopping |
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|---|---|---|---|
| CN201711464575.9A CN108155540A (en) | 2017-12-28 | 2017-12-28 | A kind of detecting system of single-frequency laser mode hopping |
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| CN108155540A true CN108155540A (en) | 2018-06-12 |
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| CN201711464575.9A Pending CN108155540A (en) | 2017-12-28 | 2017-12-28 | A kind of detecting system of single-frequency laser mode hopping |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110749420A (en) * | 2019-09-12 | 2020-02-04 | 芯华创(武汉)光电科技有限公司 | OFDR detection device |
| CN111694008A (en) * | 2020-06-08 | 2020-09-22 | 中国科学院光电技术研究所 | Method for eliminating laser mode hopping influence in frequency sweep coherent ranging |
| CN113804413A (en) * | 2021-08-06 | 2021-12-17 | 北京无线电计量测试研究所 | All-fiber laser tuning frequency measuring method and measuring device |
| US11719529B2 (en) | 2019-06-11 | 2023-08-08 | Asml Netherlands B.V. | Interferometer system, method of determining a mode hop of a laser source of an interferometer system, method of determining a position of a movable object, and lithographic apparatus |
| CN117030198A (en) * | 2023-10-10 | 2023-11-10 | 成都明夷电子科技有限公司 | Laser mode-jump detector, detection method, electronic equipment and storage medium |
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| CN105762615A (en) * | 2016-04-25 | 2016-07-13 | 天津大学 | Single frequency fiber laser mode jump monitoring system based on single-photon detection |
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| CN106248118A (en) * | 2016-07-15 | 2016-12-21 | 武汉理工大学 | High wavelength resolution optical fiber grating regulating system and method |
| CN206378144U (en) * | 2017-01-22 | 2017-08-04 | 西安交通大学 | Interferometric optical fiber sensor output wavelength fast demodulation system |
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| CN105758626A (en) * | 2016-05-09 | 2016-07-13 | 北京工业大学 | Testing system for measuring ultra-narrow line width of 852 nm semiconductor laser unit based on delayed self-heterodyne method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11719529B2 (en) | 2019-06-11 | 2023-08-08 | Asml Netherlands B.V. | Interferometer system, method of determining a mode hop of a laser source of an interferometer system, method of determining a position of a movable object, and lithographic apparatus |
| CN110749420A (en) * | 2019-09-12 | 2020-02-04 | 芯华创(武汉)光电科技有限公司 | OFDR detection device |
| CN110749420B (en) * | 2019-09-12 | 2022-05-06 | 芯华创(武汉)光电科技有限公司 | OFDR detection device |
| CN111694008A (en) * | 2020-06-08 | 2020-09-22 | 中国科学院光电技术研究所 | Method for eliminating laser mode hopping influence in frequency sweep coherent ranging |
| CN113804413A (en) * | 2021-08-06 | 2021-12-17 | 北京无线电计量测试研究所 | All-fiber laser tuning frequency measuring method and measuring device |
| CN117030198A (en) * | 2023-10-10 | 2023-11-10 | 成都明夷电子科技有限公司 | Laser mode-jump detector, detection method, electronic equipment and storage medium |
| CN117030198B (en) * | 2023-10-10 | 2023-12-22 | 成都明夷电子科技有限公司 | Laser mode-jump detector, detection method, electronic equipment and storage medium |
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