A frequency-doubled laser power automatic optimization system

Abstract

The utility model provides a kind of frequency-doubled laser power automatic optimization system, it is related to laser technology field, comprising: infrared laser;High temperature frequency-doubled furnace, including LBO crystal and heating sheet, LBO crystal is used to the high temperature frequency-doubled of the emergent laser of infrared laser, heating sheet is used to heat LBO crystal;Dichroic mirror, for making frequency-doubled laser transmit and making non frequency-doubled light reflect and be filtered;Spectroscope, for the reflection light and transmission light of frequency-doubled laser;Power meter, for measuring the power of reflection light;Temperature controller, for the heating of heating sheet to LBO crystal according to the reflection light power of power meter feedback controls, to adjust the temperature of LBO crystal makes the power of reflection light within the preset range fluctuation.The utility model can guarantee that the frequency-doubled power of laser through LBO crystal high temperature frequency-doubled keeps stable, is not influenced by environmental temperature fluctuation.

Description

Technical Field

[0001] This utility model relates to the field of laser technology, and in particular to an automatic power optimization system for a frequency-doubled laser. Background Technology

[0002] High-temperature frequency doubling technology using LBO crystals is an important means of increasing the frequency doubling power of lasers. However, LBO crystals exhibit extremely high sensitivity to angles during high-temperature frequency doubling. Even a small angular deviation can cause severe phase mismatch, resulting in a sharp decrease in frequency doubling power due to deformation caused by fluctuations in ambient temperature. Utility Model Content

[0003] The purpose of this invention is to provide an automatic power optimization system for frequency-doubled lasers, aiming to ensure that the frequency-doubled power of lasers frequency-doubled at high temperatures using LBO crystals is not affected by ambient temperature fluctuations. The specific technical solution is as follows:

[0004] An automatic power optimization system for a frequency-doubled laser includes:

[0005] Infrared laser;

[0006] The high-temperature frequency doubling furnace includes an LBO crystal and a heating element. The LBO crystal is used for high-temperature frequency doubling of the emitted laser from an infrared laser, and the heating element is used to heat the LBO crystal.

[0007] A dichroic mirror is used to allow frequency-doubled laser light to pass through and to filter out non-frequency-doubled light by reflecting it.

[0008] A beam splitter is used to separate frequency-doubled laser light into reflected light and transmitted light.

[0009] A power meter is used to measure the power of reflected light.

[0010] The temperature controller is used to control the heating of the LBO crystal by the heating element based on the reflected light power fed back by the power meter, so as to adjust the temperature of the LBO crystal and make the reflected light power fluctuate within a preset range.

[0011] Furthermore, the infrared laser is a medium-power infrared laser with a power range of 50W to 100W and a frequency range of 100KHz to 1000KHz.

[0012] Furthermore, the LBO crystal is a high-temperature frequency doubling crystal with a frequency doubling temperature of 140℃ to 150℃; the heating element is a constant-temperature ceramic PTC heating element with a temperature resistance of 300℃.

[0013] Furthermore, the high-temperature frequency doubling furnace also includes a base and a thermistor. The LBO crystal is placed on the base, and the thermistor is used to measure the temperature of the LBO crystal and feed it back to the temperature controller.

[0014] Furthermore, the thermistor is PT1000.

[0015] Furthermore, the dichroic mirror is a 45° dichroic mirror, which fully reflects infrared light at 45° and transmits green light at 45°.

[0016] Furthermore, the beam splitter is a green light 45° beam splitter with a reflectivity of 1%-5%.

[0017] Furthermore, the temperature controller has a temperature control accuracy of 0.01℃ and is equipped with a heating element connection interface, a thermistor temperature sensor input interface, and a power meter power monitoring input interface, which can simultaneously monitor the frequency doubling temperature and frequency doubling power of the LBO crystal.

[0018] The automatic power optimization system for a frequency-doubled laser provided by this utility model has the following beneficial effects:

[0019] This invention uses a power meter to measure the power of reflected light and a temperature controller to control the heating of the LBO crystal by a heating element based on the reflected light power feedback from the power meter. This regulates the temperature of the LBO crystal so that the power of the reflected light fluctuates within a preset range. Therefore, when the ambient temperature of the LBO crystal in the high-temperature frequency doubling furnace changes, the heating intensity of the heating element on the LBO crystal can be adjusted to keep the frequency doubling temperature of the LBO crystal constant, preventing deformation of the LBO crystal. This ensures that the frequency doubling power of the laser generated by high-temperature frequency doubling through the LBO crystal remains stable and is unaffected by ambient temperature fluctuations. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the automatic power optimization system for a frequency doubling laser provided by this utility model. Detailed Implementation

[0021] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clearly illustrate the embodiments of this utility model.

[0022] Example 1

[0023] This embodiment provides an automatic power optimization system for a frequency-doubled laser. (See attached document.) Figure 1 As shown, it includes:

[0024] Infrared laser;

[0025] The high-temperature frequency doubling furnace includes an LBO crystal and a heating element. The LBO crystal is used for high-temperature frequency doubling of the emitted laser from an infrared laser, and the heating element is used to heat the LBO crystal.

[0026] A dichroic mirror is used to allow frequency-doubled laser light to pass through and to filter out non-frequency-doubled light by reflecting it.

[0027] A beam splitter is used to separate frequency-doubled laser light into reflected light and transmitted light.

[0028] A power meter is used to measure the power of reflected light.

[0029] The temperature controller is used to control the heating of the LBO crystal by the heating element based on the reflected light power fed back by the power meter, so as to adjust the temperature of the LBO crystal and make the reflected light power fluctuate within a preset range.

[0030] In an optional embodiment, the infrared laser is a medium-power infrared laser with a power range of 50W to 100W and a frequency range of 100KHz to 1000KHz.

[0031] In an optional embodiment, the high-temperature frequency doubling furnace further includes a base and a thermistor. The LBO crystal is disposed on the base, and the thermistor is used to measure the temperature of the LBO crystal and feed it back to the temperature controller.

[0032] In one embodiment, the LBO crystal is a high-temperature frequency-doubled crystal with a frequency doubling temperature of 140°C to 150°C; the thermistor is a PT1000; and the heating element is a constant-temperature ceramic PTC heating element with a temperature resistance of 300°C.

[0033] In an optional embodiment, the dichroic mirror is a 45° dichroic mirror, which fully reflects infrared light at 45° and fully transmits green light at 45°.

[0034] In an optional embodiment, the beam splitter is a green 45° beam splitter with a reflectivity of 1%-5%.

[0035] In an optional embodiment, the temperature controller has a temperature control accuracy of 0.01℃ and is equipped with a heating element connection interface, a thermistor temperature sensor input interface, and a power meter power monitoring input interface, which can simultaneously monitor the frequency doubling temperature and frequency doubling power of the LBO crystal.

[0036] The automatic power optimization system for frequency-doubled lasers provided by this invention uses a power meter to measure the power of reflected light and a temperature controller to control the heating of the LBO crystal by a heating element based on the reflected light power feedback from the power meter. This regulates the temperature of the LBO crystal so that the power of the reflected light fluctuates within a preset range. Therefore, when the ambient temperature of the LBO crystal in the high-temperature frequency-doubled furnace changes, the heating intensity of the heating element on the LBO crystal can be adjusted to keep the frequency doubling temperature of the LBO crystal constant, preventing deformation of the LBO crystal and ensuring that the frequency doubling power of the laser generated by high-temperature frequency doubling through the LBO crystal remains stable and unaffected by ambient temperature fluctuations.

[0037] In one exemplary embodiment, the infrared laser has an output power of 100W, the beam splitter has a reflectivity of 1%, and the temperature controller heats the frequency doubling crystal via a constant-temperature ceramic PTC heating element. The temperature of the frequency doubling crystal is monitored in real time by a PT1000. The initial optimal frequency doubling temperature of the high-temperature frequency doubling crystal is set to 147.00℃ after temperature control adjustment. At this temperature, the 100W infrared laser outputs 75W of frequency-doubled light after frequency doubling by the crystal. The remaining infrared light, not converted to frequency-doubled light, is reflected by the dichroic mirror and absorbed by the absorption cylinder. The 75W frequency-doubled light is reflected by the beam splitter to a power meter, which transmits the power to the temperature controller. The temperature controller then sets the power measured by the power meter at this point as the initial power of 1.5W, while simultaneously setting the allowable power fluctuation range to 1.5W ± 20mW. The temperature controller compares and calculates the real-time power signal received with the set initial power value, then generates a temperature control signal based on the deviation. This control signal is converted into an electrical signal suitable for driving the constant-temperature ceramic PTC heating element. Based on the temperature feedback from the PT1000, the controller continuously adjusts the frequency doubling crystal temperature to ensure automatic compensation of the frequency doubling power. When the frequency doubling power deviates from the set value, the temperature controller initially adjusts the temperature upwards based on the initial frequency doubling temperature, in steps of 0.01℃. If the difference between the frequency doubling power and the initial power decreases to within the allowable range as the temperature rises, the current temperature is locked, and the frequency doubling crystal operates at the currently locked temperature. If the difference between the frequency doubling power and the initial power increases as the temperature rises, the temperature controller begins to adjust the temperature in reverse, in steps of 0.01℃, until the difference between the frequency doubling power and the initial power decreases to within the allowable range and the current power is locked.

[0038] Those skilled in the art should understand that this utility model can be implemented in many other specific forms without departing from the spirit and scope of this utility model. Any changes or modifications made by those skilled in the art based on the embodiments of this utility model and the above disclosure shall fall within the protection scope of the claims.

Claims

1. An automatic power optimization system for a frequency-doubled laser, characterized in that, include: Infrared laser; The high-temperature frequency doubling furnace includes an LBO crystal and a heating element. The LBO crystal is used for high-temperature frequency doubling of the emitted laser from an infrared laser, and the heating element is used to heat the LBO crystal. A dichroic mirror is used to allow frequency-doubled laser light to pass through and to filter out non-frequency-doubled light by reflecting it. A beam splitter is used to separate frequency-doubled laser light into reflected light and transmitted light. A power meter is used to measure the power of reflected light. The temperature controller is used to control the heating of the LBO crystal by the heating element based on the reflected light power fed back by the power meter, so as to adjust the temperature of the LBO crystal and make the reflected light power fluctuate within a preset range.

2. The automatic power optimization system for frequency-doubled lasers according to claim 1, characterized in that, The infrared laser is a medium-power infrared laser with a power range of 50W to 100W and a frequency range of 100KHz to 1000KHz.

3. The automatic power optimization system for frequency-doubled lasers according to claim 1, characterized in that, The LBO crystal is a high-temperature frequency doubling crystal with a frequency doubling temperature of 140℃ to 150℃; the heating element is a constant-temperature ceramic PTC heating element with a temperature resistance of 300℃.

4. The automatic power optimization system for frequency-doubled lasers according to claim 1, characterized in that, The high-temperature frequency doubling furnace also includes a base and a thermistor. The LBO crystal is placed on the base, and the thermistor is used to measure the temperature of the LBO crystal and feed it back to the temperature controller.

5. The automatic power optimization system for frequency-doubled lasers according to claim 4, characterized in that, The thermistor is PT1000.

6. The automatic power optimization system for frequency-doubled lasers according to claim 1, characterized in that, The dichroic mirror is a 45° dichroic mirror, which fully reflects infrared light at 45° and transmits green light at 45°.

7. The automatic power optimization system for frequency-doubled lasers according to claim 1, characterized in that, The beam splitter is a green light 45° beam splitter with a reflectivity of 1%-5%.

8. The automatic power optimization system for frequency-doubled lasers according to claim 1, characterized in that, The temperature controller has a temperature control accuracy of 0.01℃ and is equipped with a heating element connection interface, a thermistor temperature sensor input interface, and a power meter power monitoring input interface, which can simultaneously monitor the frequency doubling temperature and frequency doubling power of the LBO crystal.

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