Adaptive temperature control system and method for ensuring stable output power of pump laser

Abstract

The application provides a kind of self-adaptive temperature control system and method of pump laser for guaranteeing output power stability, and relates to the technical field of laser temperature control.The method comprises the following steps:step S1: calculating the current temperature difference and the real-time change rate of pump laser output optical power;step S2: judging whether the current temperature difference exceeds the temperature difference threshold;step S3: confirming whether the real-time change rate of the current pump laser output optical power exceeds the output optical power change rate threshold;step S4: if the real-time change rate of the current pump laser output optical power exceeds the output optical power change rate threshold, the current temperature control target is issued to the temperature control execution module and the temperature control is started;step S5: repeating the above steps S1 to S4.The system comprises a processor, a detection module and a temperature control execution module.Based on this, the application solves the problem that the existing TEC temperature control system and method cannot adapt to environmental temperature changes, thereby making it difficult to effectively guarantee the stability of pump laser output power.

Description

Technical Field

[0001] This invention relates to the field of laser temperature control technology, specifically to an adaptive temperature control system and method for pump lasers that ensures stable output power. Background Technology

[0002] In critical fields such as optical communication, precision measurement, and laser processing, the performance stability of pump lasers is paramount. A key parameter affecting this stability is output power; however, the output power of pump lasers is extremely sensitive to temperature changes. This is because temperature fluctuations directly alter the band gap of semiconductor materials, thereby affecting the photon emission energy (wavelength) and the laser's efficiency and gain (power). To address this, the industry commonly employs thermoelectric coolers (TECs) for temperature control. However, a fundamental limitation of current mainstream TEC temperature control solutions is that their temperature control target is set to a pre-fixed single temperature value. For example, Chinese patent CN119126883A discloses a TEC control circuit and method for pump laser temperature control. By setting a temperature acquisition circuit, a differential amplifier circuit, a PID control circuit, a TEC control signal generation circuit, and a TEC drive circuit, the pump laser can operate at a set temperature.

[0003] The aforementioned methods for achieving a fixed temperature control target face challenges in practical applications. Specifically, when ambient temperature inevitably changes, the temperature control system cannot dynamically adjust its target temperature based on the core requirement of maintaining a stable wavelength and power of the laser. Because the target temperature remains constant, TEC control cannot actively compensate for the impact of ambient temperature fluctuations on the internal heat load distribution and temperature gradient of the laser. The direct consequence is that the actual temperature and its uniformity in the laser's critical operating area will still change adversely, inevitably leading to alterations in the band gap of the semiconductor material. Ultimately, this band gap change will inevitably cause a shift in the output wavelength and fluctuations in output power of the pump laser, thus limiting the long-term stability of the laser's performance.

[0004] In summary, this invention provides an adaptive temperature control system and method for a pump laser that ensures stable output power. Summary of the Invention

[0005] The purpose of this invention is to provide an adaptive temperature control system and method for pump lasers that ensures stable output power, thereby solving the problem mentioned in the background art that existing TEC temperature control systems and methods cannot adapt to changes in ambient temperature, thus making it difficult to effectively ensure the stability of pump laser output power.

[0006] This invention is achieved using the following technical solution:

[0007] An adaptive temperature control method for a pump laser that ensures stable output power includes the following steps:

[0008] Step S1: Calculate the current temperature difference and the real-time rate of change of the pump laser output power, where the temperature difference is the difference between the ambient temperature and the pump laser's own temperature.

[0009] Step S2: Determine whether the current temperature difference exceeds the temperature difference threshold;

[0010] Step S3: If the current temperature difference exceeds the temperature difference threshold, confirm whether the real-time rate of change of the output optical power of the pump laser exceeds the output optical power change rate threshold.

[0011] Step S4: If the real-time rate of change of the output optical power of the current pump laser exceeds the threshold of the rate of change of output optical power, then issue the current temperature control target to the temperature control execution module and start temperature control.

[0012] Step S5: Repeat steps S1 to S4 above.

[0013] Furthermore, in step S4, the current temperature control target is calculated based on the standard value of the pump laser's set output optical power, the current temperature difference, and the real-time rate of change of the current pump laser's output optical power.

[0014] Furthermore, in step S1, before calculating the current temperature difference and the real-time rate of change of the pump laser output optical power, the current ambient temperature, the pump laser's own temperature, and the pump laser's output optical power are detected respectively.

[0015] Furthermore, the temperature difference threshold is ±1℃, and the output optical power change rate threshold is ±0.3%.

[0016] An adaptive temperature control system for a pump laser, designed to ensure stable output power, is provided to implement the aforementioned adaptive temperature control method for ensuring stable output power. The system includes a processor, a detection module, and a temperature control execution module, both of which are communicatively connected to the processor. The detection module detects the current ambient temperature, the pump laser's own temperature, and the pump laser's output power. The processor calculates and determines whether the current temperature difference exceeds a temperature difference threshold, whether the real-time rate of change of the pump laser's output power exceeds a rate of change threshold, and calculates the current temperature control target and controls the temperature control execution module. The temperature control execution module performs the temperature control.

[0017] Furthermore, the detection module includes an ambient temperature acquisition unit, a pump laser temperature acquisition unit, and an output optical power acquisition unit, which are respectively connected to the processor.

[0018] Furthermore, the pump laser temperature acquisition unit includes a thermistor built into or external to the pump laser, and the output optical power acquisition unit includes a photodiode.

[0019] Furthermore, the temperature control execution module includes a TEC module.

[0020] The beneficial effects achieved by this invention are:

[0021] This invention provides an adaptive temperature control system and method for a pump laser to ensure stable output power. By setting up a processor, a detection module, and a temperature control execution module, and executing steps S1 to S5, the system aims to maintain stable output optical power of the pump laser. Based on the current ambient temperature, the pump laser's own temperature, and the output optical power, the system adjusts the current temperature control target of the temperature control execution module in real time. Compared with existing conventional TEC temperature control methods with fixed temperature control targets, this invention innovatively proposes a dynamic response temperature control system that can adapt to ambient temperature. This system can actively compensate for the impact of ambient temperature drift on the laser's thermal load, thus effectively suppressing changes in the bandgap of semiconductor materials, significantly reducing output wavelength shift and power fluctuations, and improving the long-term operational reliability of the laser. Attached Figure Description

[0022] Figure 1 This is a schematic block diagram illustrating the structural composition and working logic of the adaptive temperature control system described in this embodiment of the invention.

[0023] Figure 2 This is a schematic diagram of the circuit structure of the pump laser temperature acquisition unit in the adaptive temperature control system described in this embodiment of the invention;

[0024] Figure 3 This is a schematic diagram of the circuit structure of the output optical power acquisition unit in the adaptive temperature control system described in this embodiment of the invention;

[0025] Figure 4 This is a schematic diagram of the circuit structure of the temperature control execution module in the adaptive temperature control system described in this embodiment of the invention;

[0026] Figure 5 This is a schematic flowchart of the adaptive temperature control method described in an embodiment of the present invention;

[0027] In the diagram: 1. Processor; 2. Pump laser; 3. Thermistor; 4. Analog-to-digital converter; 5. Photodiode; 6. PWM motor drive unit; 7. TEC module. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0029] Example 1

[0030] The first aspect of this embodiment provides an adaptive temperature control system for a pump laser that ensures stable output power. Please refer to [link / reference]. Figures 1 to 4 The system includes a processor 1, a detection module, and a temperature control execution module, both of which are communicatively connected to the processor 1. The detection module detects the current ambient temperature, the temperature of the pump laser 2 itself, and the output optical power of the pump laser 2. The processor 1 calculates and determines whether the current temperature difference (the difference between the ambient temperature and the temperature of the pump laser 2) exceeds a temperature difference threshold, whether the real-time rate of change of the output optical power of the pump laser 2 exceeds a rate of change threshold, and calculates the current temperature control target and controls the temperature control execution module to operate. The temperature control execution module is used to perform temperature control. Specifically:

[0031] The adaptive temperature control system provided in this embodiment is applied to a 980nm pump laser 2. The detection module includes an ambient temperature acquisition unit, a pump laser temperature acquisition unit, and an output optical power acquisition unit, all of which are communicatively connected to a processor 1. Specifically, the processor 1 is a high-speed processor 1, such as an FPGA, capable of high-speed computation and control. The ambient temperature acquisition unit includes a high-precision sensor for accurate ambient temperature acquisition. The pump laser temperature acquisition unit includes a thermistor 3, either built into or external to the pump laser 2, which is connected to the processor 1 via an analog-to-digital converter 4. The output optical power acquisition unit includes a photodiode 5, which is connected to the processor 1 via an amplifier. The temperature control execution module includes a TEC module 7, which is connected to the processor 1 via a PWM motor drive unit 6.

[0032] The second aspect of this embodiment provides an adaptive temperature control method for a pump laser to ensure stable output power, applying the adaptive temperature control system described above, such as... Figure 5 As shown, it includes the following steps:

[0033] Step S1: The ambient temperature acquisition unit in the detection module detects the current ambient temperature value, and the pump laser temperature acquisition unit detects the current temperature value of the pump laser 2 itself; the ambient temperature acquisition unit and the pump laser temperature acquisition unit transmit the detected values ​​to the processor 1, and the processor 1 calculates the current temperature difference and the real-time change rate of the output optical power of the pump laser 2, respectively.

[0034] Step S2: Processor 1 determines whether the current temperature difference exceeds the temperature difference threshold, which is specifically ±1℃.

[0035] Step S3: If the judgment result is that the current temperature difference exceeds the temperature difference threshold, it means that the output optical power of the pump laser 2 may change at any time, and the wavelength may shift at any time. Therefore, the processor 1 needs to confirm whether the real-time change rate of the output optical power of the pump laser 2 exceeds the output optical power change rate threshold, which is specifically ±0.3%.

[0036] Specifically, when the difference between the ambient temperature and the temperature of the pump laser 2 exceeds the temperature difference threshold:

[0037] Without temperature control measures: for every 1°C increase in temperature, the laser threshold current increases by 1% to 2%, and the output optical power decreases by 1 / 3% at the same drive current. For example, when the temperature rises from 25°C to 55°C, the laser threshold current increases by approximately 30%, and the power decreases by 5% to 10%.

[0038] Under the condition of ordinary TEC temperature control with a fixed temperature control target: there is a wavelength shift. The wavelength temperature sensitivity of the 980nm pump laser 2 is approximately 0.02~0.03nm / ℃. Therefore, the wavelength shift Δλ for a deviation of 0.1℃ is Δλ = 0.1℃ × 0.02nm / ℃ = 0.002nm (at room temperature, if calculated based on 0.03nm / ℃, it is 0.003nm). The power stability of the 980nm pump laser 2 depends on the matching degree between the wavelength and the absorption peak of the erbium-doped fiber (the half-width of the absorption peak is approximately 0.5~1nm). Therefore, a wavelength shift of 0.002~0.003nm may cause power fluctuations of ±0.1%~±0.3%, that is, a temperature drift of 0.1℃ may cause power fluctuations of ±0.1%~±0.3%.

[0039] Step S4: If the judgment result is that the real-time change rate of the output optical power of the current pump laser 2 exceeds the threshold of the output optical power change rate, then the current temperature control target is sent to the temperature control execution module and temperature control is started.

[0040] The current temperature control target is calculated by processor 1 based on the standard value of the output optical power set by pump laser 2, the current temperature difference, and the real-time rate of change of the output optical power of pump laser 2. When temperature control is activated, processor 1 drives TEC module 7 to perform the corresponding temperature control action by controlling PWM motor drive unit 6.

[0041] Step S5: Repeat steps S1 to S4 above to continuously adjust the temperature control target based on the current temperature difference and output optical power, thereby making the output optical power of pump laser 2 fluctuate less.

[0042] Experiments were conducted using the adaptive temperature control method provided in this embodiment and the existing conventional TEC temperature control method, and the results are shown in the table below:

[0043] Table 1: Output optical power error values ​​achieved by the adaptive temperature control method

[0044]

[0045] Table 2: Output optical power error values ​​achieved by existing conventional TEC temperature control methods

[0046]

[0047] The experimental results above show that when the temperature difference between the pump laser 2 and the ambient temperature is small, the power output error achieved by the adaptive temperature control method and the existing ordinary TEC temperature control method is relatively close; however, when the temperature difference is large, the adaptive temperature control method provided in this embodiment is significantly better than the existing ordinary TEC temperature control method.

[0048] In summary, the adaptive temperature control system and method for pump lasers that ensure stable output power provided in this embodiment, by setting up a processor, a detection module, and a temperature control execution module, and executing steps S1 to S5, can maintain the stable output optical power of the pump laser 2. Based on the current ambient temperature, the pump laser 2's own temperature, and the output optical power, the system can adjust the current temperature control target of the temperature control execution module in real time. Therefore, compared with existing conventional TEC temperature control methods that use a fixed temperature control target, this invention innovatively proposes a dynamic response temperature control system that can adapt to ambient temperature. This system can actively compensate for the impact of ambient temperature drift on the laser's thermal load, thus effectively suppressing changes in the bandgap of semiconductor materials, significantly reducing output wavelength shift and power fluctuations, and improving the long-term operational reliability of the laser.

[0049] It should be noted that the parts not described in detail or in detail in the above solution, such as the specific software algorithm for processor 1 to calculate the temperature control target, the specific structure of TEC module 7 for temperature control, etc., are all existing technologies and do not belong to the improvements made by this invention to the existing technology, nor are they within the protection scope of the technical solution of this invention. Therefore, they will not be elaborated on in this article.

[0050] Of course, the above description is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the embodiments of the present invention. The present invention is also not limited to the above examples, and all equivalent changes and improvements made by those skilled in the art within the scope of the present invention should fall within the patent coverage of the present invention.

Claims

1. An adaptive temperature control method for a pump laser that ensures stable output power, characterized in that, Includes the following steps: Step S1: Calculate the current temperature difference and the real-time rate of change of the output optical power of the pump laser (2) respectively, where the temperature difference is the difference between the ambient temperature and the temperature of the pump laser (2) itself. Step S2: Determine whether the current temperature difference exceeds the temperature difference threshold; Step S3: If the current temperature difference exceeds the temperature difference threshold, confirm whether the real-time rate of change of the output optical power of the current pump laser (2) exceeds the output optical power change rate threshold. Step S4: If the real-time rate of change of the output optical power of the current pump laser (2) exceeds the threshold of the rate of change of output optical power, then the current temperature control target is sent to the temperature control execution module and temperature control is started; Step S5: Repeat steps S1 to S4 above; In step S4, the current temperature control target is calculated based on the standard value of the output optical power of the pump laser (2), the current temperature difference, and the real-time rate of change of the output optical power of the pump laser (2).

2. The adaptive temperature control method for pump lasers to ensure stable output power according to claim 1, characterized in that, In step S1, before calculating the current temperature difference and the real-time rate of change of the output optical power of the pump laser (2), the current ambient temperature, the pump laser (2) temperature itself, and the output optical power of the pump laser (2) are detected respectively.

3. An adaptive temperature control system for a pump laser that ensures stable output power, used to implement the adaptive temperature control method for a pump laser that ensures stable output power as described in any one of claims 1-2, characterized in that: The system includes a processor (1), a detection module, and a temperature control execution module. The detection module and the temperature control execution module are respectively connected to the processor (1) for communication. The detection module is used to detect the current ambient temperature, the pump laser (2) temperature, and the pump laser (2) output optical power. The processor (1) is used to calculate and determine whether the current temperature difference exceeds the temperature difference threshold, whether the real-time rate of change of the current pump laser (2) output optical power exceeds the output optical power change rate threshold, and to calculate the current temperature control target and control the temperature control execution module to work. The temperature control execution module is used to perform temperature control.

4. The adaptive temperature control system for pump lasers that ensures stable output power according to claim 3, characterized in that: The detection module includes an ambient temperature acquisition unit, a pump laser temperature acquisition unit, and an output optical power acquisition unit, which are respectively connected to the processor (1) for communication.

5. The adaptive temperature control system for pump lasers that ensures stable output power according to claim 4, characterized in that: The pump laser temperature acquisition unit includes a thermistor (3) that is built into or external to the pump laser (2), and the output optical power acquisition unit includes a photodiode (5).

6. The adaptive temperature control system for pump lasers that ensures stable output power according to claim 4, characterized in that: The temperature control execution module includes a TEC module (7).

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