Multi-parameter synchronous monitoring type tunable laser light source

Abstract

The invention, which relates to the technical field of the tunable laser, discloses a multi-parameter synchronous monitoring type tunable laser source comprising a tunable laser, a grating monochromator, a photoelectric detector, a data acquisition system, a data communication system and a control processing host. The tunable laser comprises a tunable laser body, a spectroscope, a mechanical tuning mechanism, a temperature detection mechanism, a temperature control mechanism and a motor controller. The self-tuning crystal serves as a gain medium and also serves as an intracavity tuning element, tuning of the wavelength of the tunable laser can be achieved through control of the rotating motor, the temperature of the tunable laser body is monitored through the temperature detection mechanism, the wavelength of the laser is monitored through the grating monochromator, and the power of the laser is monitored through the photoelectric detector. Therefore, multi-parameter synchronous monitoring can be carried out, and the problem of wavelength drift caused by overlarge temperature change is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunable laser, in particular to a multi-parameter synchronous monitoring type tunable laser light source. BACKGROUND

[0002] The wavelength tunable laser is an optical instrument for continuously adjusting wavelength by built-in tunable filter or mechanical tuning mechanism, and the patent number CN101609956B and the name of the patent document of closed loop feedback intelligent control system of tunable laser are provided with laser pumped by pumping source, and the laser output by the tunable laser is applied after part of the laser is output by a beam splitter, and the other part is received by a grating monochromator, and a closed loop control is formed by subsequent circuits, specifically, the output end of the grating monochromator is connected with a data acquisition system, the data acquisition system receives the wavelength of the laser output, the data acquisition system is connected with a host computer through a communication part, and the communication part is connected with a mechanical turntable on which a nonlinear crystal is placed through an actuator; the data acquisition system collects the output laser parameters of the beam splitter through the grating monochromator, and transmits the laser parameters to the host computer through the communication part, the host computer compares the collected laser parameters with the laser parameters previously set in the host computer, forms a control signal according to the difference between the two, and controls the mechanical turntable to rotate through the communication part and the actuator, thereby controlling the angle of the nonlinear crystal, and adjusting the laser parameters output by the tunable laser to be consistent with the laser parameters previously set in the host computer.

[0003] The data acquisition system also includes a photoelectric probe, which can monitor the power of the laser, so that the technical solution can monitor the wavelength and power parameters of the laser, but cannot monitor the temperature parameter, because the tunable laser is very sensitive to temperature, and once the temperature rises or decreases, the wavelength will drift, that is, the temperature drift, so if the temperature is not monitored and controlled, the stability of the wavelength, the uniformity of the output power and the safety of the laser cannot be ensured. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a multi-parameter synchronous monitoring type tunable laser light source, which solves the problems of the prior art.

[0005] To achieve the above purpose, the present application is realized by the following technical scheme: a multi-parameter synchronous monitoring type tunable laser light source, comprising a tunable laser, a grating monochromator, a photoelectric detector, a data acquisition system, a data communication system and a control processing host computer. The tunable laser comprises a tunable laser body, a beam splitter, a mechanical tuning mechanism, a temperature detection mechanism, a temperature control mechanism and a motor controller. The tunable laser body is internally provided with a pump source, a coupling system and an optical resonant cavity, the pump laser generated by the pump source is focused by the coupling system and then enters the optical resonant cavity, the optical resonant cavity at least comprises two cavity mirrors, a self-tuning crystal is further arranged in the optical resonant cavity, the mechanical tuning mechanism is a rotary motor, the rotary motor is connected with the self-tuning crystal, the self-tuning crystal is arranged on the light path between the two cavity mirrors of the optical resonant cavity, the motor controller is used for controlling the rotary motor, the laser output by the tunable laser body is divided into two beams by the beam splitter, one beam enters the grating monochromator, and the other beam enters the photodetector. The output ends of the grating monochromator and the photodetector are electrically connected with the data acquisition system, the temperature detection mechanism is used for monitoring the temperature of the tunable laser body, and the output end of the temperature detection mechanism is electrically connected with the data acquisition system. The output end of the data acquisition system is electrically connected with the data communication system, and the data communication system is bidirectionally electrically connected with the control processing host. The mechanical tuning mechanism is used for adjusting the wavelength of the laser output by the tunable laser body, and the temperature control mechanism is used for controlling the temperature of the tunable laser body, and the data communication system is bidirectionally electrically connected with the motor controller and the temperature control mechanism.

[0006] Preferably, the temperature detection mechanism comprises a thermistor one, a thermistor two, a thermistor three and a thermistor four, and the output ends of the thermistor one, the thermistor two, the thermistor three and the thermistor four are electrically connected with the data acquisition system.

[0007] Preferably, the temperature control mechanism is three semiconductor refrigerators, and the three semiconductor refrigerators are respectively used for cooling the pump source, the optical resonant cavity and the self-tuning crystal.

[0008] Preferably, the thermistor one is used for monitoring the temperature of the pump source, the thermistor two is used for monitoring the temperature of the optical resonant cavity, the thermistor three is used for monitoring the temperature of the self-tuning crystal, and the four thermistors are three, and the three thermistors are respectively used for monitoring the temperatures of the heat dissipation surfaces of the three semiconductor refrigerators.

[0009] Preferably, the output ends of the thermistor one, the thermistor two, the thermistor three and the thermistor four are electrically connected with the fault alarm mechanism.

[0010] Preferably, the fault alarm mechanism is bidirectionally electrically connected with the data communication system.

[0011] Preferably, the failure alarm mechanism comprises a processing module, a timing module and an alarm module, the processing module, the timing module and the alarm module are all bidirectionally electrically connected with the data communication system, the timing module is used for counting the time of temperature anomaly, the processing module is a water cooling auxiliary mechanism, and the water cooling auxiliary mechanism is used for temporarily controlling temperature when the semiconductor refrigerator fails.

[0012] Preferably, the self-tuning crystal is a birefringent gain crystal, which can be a Ti:sapphire crystal, a K5Nd(MoO4)4 crystal, a La3Ga5SiO 14 :Nd 3+ crystal or a Rb5Nd(MoO4)4 crystal or other gain crystals with birefringence characteristics.

[0013] The application provides a multi-parameter synchronous monitoring type tunable laser light source. 1. The multi-parameter synchronous monitoring type tunable laser light source, by the temperature detection mechanism, the temperature of the tunable laser body is monitored, by the grating monochromator, the wavelength of the laser is monitored, by the photoelectric detector, the power of the laser is monitored, so that multi-parameter synchronous monitoring can be carried out, and the problem that wavelength drift is caused by too large temperature change is avoided.

[0014] 2. The multi-parameter synchronous monitoring type tunable laser light source, the first thermistor is used for monitoring the temperature of the pump source, the second thermistor is used for monitoring the temperature of the optical resonant cavity, the third thermistor is used for monitoring the temperature of the self-tuning crystal, and the fourth thermistor is used for monitoring the temperature of the heat dissipation surface of the three semiconductor refrigerators, so that the tunable laser body can be monitored at multiple points, the accuracy and range of temperature monitoring are improved, then the temperature is adjusted by the temperature control mechanism, the tunable laser body is ensured to be in a required temperature environment, so that the stability of wavelength, the uniformity of output power and the safety of the tunable laser body are avoided; the temperatures monitored by the first thermistor, the second thermistor, the third thermistor and the fourth thermistor are collected by the data acquisition system, are sent to the control processing host through the data communication system for analysis and processing, when temperature anomaly is found, the temperature control mechanism is processed, and the timing module starts to count the time of temperature anomaly, when it is found that the temperature is not adjusted within a set time, it is indicated that the temperature control mechanism fails, an alarm is sent out through the alarm module, and the temperature is temporarily adjusted through the processing module, so that the tunable laser body is ensured to be in a required temperature environment. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a whole schematic diagram of the application; Figure 2 It is a schematic diagram of the tunable laser of the application; Figure 3This is a connection diagram of the temperature detection mechanism of the present invention; Figure 4 This is a schematic diagram showing the connection between the motor controller and the temperature control mechanism of the present invention; Figure 5 This is a schematic diagram of the temperature detection mechanism of the present invention; Figure 6 This is a schematic diagram of the fault alarm mechanism of the present invention; Figure 7 This is a schematic diagram of a first embodiment of the local structure of the tunable laser body of the present invention; Figure 8 For the present invention Figure 7 A schematic diagram of the setup of the self-tuning crystal.

[0016] In the diagram: 1. Tunable laser; 11. Tunable laser body; 12. Beam splitter; 13. Mechanical tuning mechanism; 14. Temperature detection mechanism; 141. Thermistor 1; 142. Thermistor 2; 143. Thermistor 3; 144. Thermistor 4; 15. Temperature control mechanism; 16. Pump source; 17. Coupling system; 18. Optical resonant cavity; 19. Motor controller; 20. Self-tuning crystal; 2. Grating monochromator; 3. Photodetector; 4. Data acquisition system; 5. Data communication system; 6. Control processing host; 7. Fault alarm mechanism; 71. Processing module; 72. Timing module; 73. Alarm module. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] See Figures 1-8 The present invention provides the following two technical solutions: The first implementation method: a multi-parameter synchronous monitoring type tunable laser source, including a tunable laser 1, a grating monochromator 2, a photodetector 3, a data acquisition system 4, a data communication system 5, and a control processing host 6; The tunable laser 1 includes a tunable laser body 11, a beam splitter 12, a mechanical tuning mechanism 13, a temperature detection mechanism 14, a temperature control mechanism 15, and a motor controller 19; The tunable laser body 11 is equipped with a pump source 16, a coupling system 17, and an optical resonant cavity 18. The pump laser generated by the pump source 16 is focused by the coupling system 17 and enters the optical resonant cavity 18. The optical resonant cavity 18 includes at least two cavity mirrors and a self-tuning crystal 20. The mechanical tuning mechanism 13 is a rotary motor, which is connected to the self-tuning crystal 20. The self-tuning crystal 20 is placed in the optical path between the two cavity mirrors of the optical resonant cavity 18. The motor controller 19 is used to control the rotary motor to rotate, thereby changing the angle between the optical axis of the self-tuning crystal 20 and the incident surface, and thus achieving the tuning of the output laser wavelength. The laser output by the tunable laser body 11 is split into two beams by the beam splitter 12. One beam enters the grating monochromator 2, and the other beam enters the photodetector 3. The self-tuning crystal 20 is a birefringent gain crystal, which can be Ti:sapphire crystal, K5Nd(MoO4)4 crystal, or La3Ga5SiO4 crystal. 14 :Nd 3+ Gain crystals with birefringence, such as crystals or Rb5Nd(MoO4)4 crystals, are used. The self-tuning crystal 20 is a birefringent gain crystal, which serves as both a gain medium and a tuning element, effectively reducing cavity losses and increasing output power. like Figure 7 As shown, the tunable laser body 11 also includes a self-injected high-reflectivity mirror outside the optical resonant cavity 18. The pump source 16 emits light with a center wavelength of 532 nm. The emitted laser light is shaped and focused by the coupling system 17 and then incident on a self-tuned titanium-sapphire crystal placed in the annular optical resonant cavity 18 with four cavity mirrors. Its structure is as follows. Figure 8 As shown; The output terminals of the grating monochromator 2 and the photodetector 3 are both electrically connected to the data acquisition system 4. The temperature detection mechanism 14 is used to monitor the temperature of the tunable laser body 11, and the output terminal of the temperature detection mechanism 14 is electrically connected to the data acquisition system 4. The output of the data acquisition system 4 is electrically connected to the data communication system 5, and the data communication system 5 is bidirectionally electrically connected to the control processing host 6. After acquiring parameters such as wavelength, power and temperature through the data acquisition system 4, the data is transmitted to the control processing host 6 for processing through the data communication system 5. The mechanical tuning mechanism 13 is used to adjust the laser wavelength output by the tunable laser body 11, and the temperature control mechanism 15 is used to control the temperature of the tunable laser body 11, such as... Figure 4As shown, the data communication system 5 is bidirectionally electrically connected to the motor controller 19 and the temperature control mechanism 15. The control processing host 6 sends control information to the motor controller 19 through the data communication system 5, controls the mechanical tuning mechanism 13 to tune, and obtains the required wavelength. By controlling the temperature control mechanism 15 through the data communication system 5, the temperature can be controlled so that the tunable laser body 11 is at the required temperature.

[0019] The temperature detection mechanism 14 includes a thermistor 141, a thermistor 142, a thermistor 143, and a thermistor 144. The output terminals of thermistors 141, 142, 143, and 144 are electrically connected to the data acquisition system 4. Thermistor 141 is used to monitor the temperature of the pump source 16, thermistor 142 is used to monitor the temperature of the optical resonant cavity 18, thermistor 143 is used to monitor the temperature of the self-tuning crystal 20, and there are three thermistors 144. The three thermistors 144 monitor the temperature of the three semiconductor cooler heat dissipation surfaces, which can perform multi-point monitoring of the tunable laser body 11, improving the accuracy and range of temperature monitoring.

[0020] The temperature control mechanism 15 consists of three semiconductor coolers, which are used to cool the pump source 16, the optical resonant cavity 18, and the self-tuning crystal 20, respectively.

[0021] The second implementation method differs from the first implementation method mainly in that: Figure 5As shown, the multi-parameter synchronous monitoring type tunable laser source also includes a fault alarm mechanism 7. The output terminals of thermistors 141, 142, 143, and 144 are all electrically connected to the fault alarm mechanism 7. The fault alarm mechanism 7 is bidirectionally electrically connected to the data communication system 5. The fault alarm mechanism 7 includes a processing module 71, a timing module 72, and an alarm module 73. All three modules are bidirectionally electrically connected to the data communication system 5. The timing module 72 is used to statistically analyze the time of temperature anomalies. The processing module 71 is a water-cooling auxiliary mechanism used for temporary temperature control when the semiconductor cooler malfunctions. The temperatures monitored by thermistors 141, 142, 143, and 144 are collected by the data acquisition system 4 and sent to the control processing host 6 for analysis and processing via the data communication system 5. When a fault is detected... After a temperature anomaly occurs, the temperature control mechanism 15 handles the situation and simultaneously sends a signal to the timing module 72 via the data communication system 5. This causes the timing module 72 to start tracking the time of the temperature anomaly. If the temperature is not properly adjusted after the set time has elapsed, it indicates a malfunction in the temperature control mechanism 15. In this case, a signal is also sent to the alarm module 73 via the data communication system 5 to trigger an alarm. The processing module 71, i.e., the water-cooling auxiliary mechanism, temporarily adjusts the temperature to ensure that the tunable laser body 11 is kept in the required temperature environment. For example, cooling serpentine tubes are installed on the pump source 16, the optical resonator 18, and the self-tuning crystal 20. Cooling water is supplied by the main pump, and the corresponding valves are opened to allow the cooling water to enter the corresponding cooling serpentine tubes to cool the pump source 16, the optical resonator 18, and the self-tuning crystal 20 individually or together.

[0022] Furthermore, all content not described in detail in this specification is existing technology known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited; conventional equipment can be used.

[0023] In use, the temperature of the tunable laser body 11 is monitored by the temperature detection mechanism 14, the wavelength of the laser is monitored by the grating monochromator 2, and the power of the laser is monitored by the photodetector 3, thus enabling simultaneous monitoring of multiple parameters. When an abnormal temperature is detected, it is handled by the temperature control mechanism 15. At the same time, the fault alarm mechanism 7 detects whether the temperature control mechanism 15 has completed temperature control within the specified time. If it has not, it indicates that the temperature control mechanism 15 has malfunctioned, and the fault alarm mechanism 7 will then sound an alarm and handle the fault, so as to stably ensure that the tunable laser body 11 is in the required temperature environment.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-parameter synchronous monitoring type tunable laser source, characterized in that: It includes a tunable laser (1), a grating monochromator (2), a photodetector (3), a data acquisition system (4), a data communication system (5), and a control processing host (6). The tunable laser (1) includes a tunable laser body (11), a beam splitter (12), a mechanical tuning mechanism (13), a temperature detection mechanism (14), a temperature control mechanism (15), and a motor controller (19). The tunable laser body (11) is provided with a pump source (16), a coupling system (17) and an optical resonant cavity (18). The pump laser generated by the pump source (16) is focused by the coupling system (17) and enters the optical resonant cavity (18). The optical resonant cavity (18) includes at least two cavity mirrors. The optical resonant cavity (18) is also provided with a self-tuning crystal (20). The mechanical tuning mechanism (13) is a rotary motor and is connected to the self-tuning crystal (20). The self-tuning crystal (20) is located in the optical path between the two cavity mirrors of the optical resonant cavity (18). The motor controller (19) is used to control the rotary motor. The laser output by the tunable laser body (11) is split into two beams by a beam splitter (12). One beam enters the grating monochromator (2) and the other beam enters the photodetector (3). The output terminals of the grating monochromator (2) and the photodetector (3) are both electrically connected to the data acquisition system (4). The temperature detection mechanism (14) is used to monitor the temperature of the tunable laser body (11), and the output terminal of the temperature detection mechanism (14) is electrically connected to the data acquisition system (4). The output of the data acquisition system (4) is electrically connected to the data communication system (5), and the data communication system (5) is bidirectionally electrically connected to the control processing host (6). The mechanical tuning mechanism (13) is used to adjust the laser wavelength output by the tunable laser body (11), and the temperature control mechanism (15) is used to control the temperature of the tunable laser body (11). The data communication system (5) is bidirectionally electrically connected to the motor controller (19) and the temperature control mechanism (15).

2. The multi-parameter synchronous monitoring type tunable laser source according to claim 1, characterized in that: The temperature detection mechanism (14) includes a thermistor one (141), a thermistor two (142), a thermistor three (143) and a thermistor four (144), and the output terminals of the thermistor one (141), thermistor two (142), thermistor three (143) and thermistor four (144) are electrically connected to the data acquisition system (4).

3. The multi-parameter synchronous monitoring type tunable laser source according to claim 2, characterized in that: The temperature control mechanism (15) consists of three semiconductor coolers, which are used to cool the pump source (16), the optical resonant cavity (18), and the self-tuning crystal (20), respectively.

4. The multi-parameter synchronous monitoring type tunable laser source according to claim 3, characterized in that: Thermistor 1 (141) is used to monitor the temperature of the pump source (16), thermistor 2 (142) is used to monitor the temperature of the optical resonant cavity (18), thermistor 3 (143) is used to monitor the temperature of the self-tuning crystal (20), and there are three thermistors 4 (144), which monitor the temperature of the heat dissipation surfaces of the three semiconductor coolers respectively.

5. A multi-parameter synchronous monitoring type tunable laser source according to claim 4, characterized in that: The output terminals of thermistor one (141), thermistor two (142), thermistor three (143) and thermistor four (144) are all electrically connected to the fault alarm mechanism (7).

6. A multi-parameter synchronous monitoring type tunable laser source according to claim 5, characterized in that: The fault alarm mechanism (7) is bidirectionally electrically connected to the data communication system (5).

7. A multi-parameter synchronous monitoring type tunable laser source according to claim 6, characterized in that: The fault alarm mechanism (7) includes a processing module (71), a timing module (72) and an alarm module (73). The processing module (71), the timing module (72) and the alarm module (73) are all bidirectionally electrically connected to the data communication system (5). The timing module (72) is used to count the time of temperature abnormality. The processing module (71) is a water-cooling auxiliary mechanism. The water-cooling auxiliary mechanism is used for temporary temperature control when the semiconductor cooler fails.

8. A multi-parameter synchronous monitoring type tunable laser source according to claim 1, characterized in that: The self-tuning crystal (20) is a birefringent gain crystal, which can be Ti:sapphire crystal, K5Nd(MoO4)4 crystal, or La3Ga5SiO4 crystal. 14 :Nd 3+ Gain crystals with birefringence, such as crystals or Rb5Nd(MoO4)4 crystals.

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