CN216085694U - Laser wavelength switching device - Google Patents
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- CN216085694U CN216085694U CN202122450285.7U CN202122450285U CN216085694U CN 216085694 U CN216085694 U CN 216085694U CN 202122450285 U CN202122450285 U CN 202122450285U CN 216085694 U CN216085694 U CN 216085694U
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Abstract
The embodiment of the application provides a laser wavelength switching device, including frequency doubling system and temperature control system, temperature control system includes at least one frequency doubling component, and the frequency doubling component disposes the frequency doubling crystal, and basic frequency light passes through the frequency doubling system obtains the mixed light of different wavelengths, and temperature control system changes frequency doubling efficiency through adjusting frequency doubling crystal temperature, under the condition of not moving the frequency doubling crystal, realizes the wavelength separation after the laser frequency conversion, improves the energy/power of independent output basic frequency light, also can realize adjusting or demarcating the output energy of different wavelength laser through adjusting frequency doubling crystal temperature. Simple structure saves the volume, and stability is good, has expanded the application scope of laser instrument.
Description
Technical Field
The embodiment of the application relates to the technical field of laser science, in particular to a laser wavelength switching device.
Background
The nonlinear optical crystal can realize a second-order nonlinear optical effect and is used for carrying out frequency conversion on laser, common methods comprise frequency doubling, difference frequency, OPO and other technologies, the tunable range of the laser is greatly expanded, and the requirements on laser with different wave bands in the prior art are met.
When the fundamental frequency laser interacts with the nonlinear frequency doubling crystal, the variable frequency light different from the fundamental frequency light can be output when certain phase matching is met, and the change of the laser wavelength is realized. However, in either method, the fundamental light cannot be completely converted into laser light of another wavelength, and thus, it is necessary to separate the fundamental light from the converted laser light. Conventional separation methods such as prism spectroscopy, dichroic mirror spectroscopy, etc. separate light of different frequencies and then output them individually. Because a part of energy/power of the fundamental frequency light is converted into variable frequency light energy, the energy of the fundamental frequency light after light splitting is reduced, the higher the conversion efficiency is, and the weaker the energy/power of the fundamental frequency light output after light splitting is finally. For example, for a 1064nm laser with frequency doubling to generate 532nm laser, when the efficiency of the frequency doubling crystal is 50%, the 1064nm laser after light splitting loses 50% of energy/power, and if a user needs higher output energy/power of fundamental frequency light, the nonlinear crystal needs to be moved, and the switching of the wavelength is realized by using the cut-in and cut-out of the crystal, or the output energy/power of the fundamental frequency light of the laser is improved. The switching device relying on moving the nonlinear crystal is complex in structure and easy to be out of order, and the introduced switching device increases the failure probability of the laser. The cost of the laser is greatly increased by improving the output energy/power of the fundamental frequency light of the laser, and the performance and the application range of the laser are influenced to a certain extent.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a laser wavelength switching device, aiming at realizing wavelength separation after laser frequency conversion, improving the energy/power of independent output fundamental frequency light and realizing wavelength switching under the condition of not moving a nonlinear crystal.
In a first aspect, an embodiment of the present application provides a laser wavelength switching device, including:
the frequency doubling system comprises at least one frequency doubling element, the frequency doubling element is provided with a frequency doubling crystal, and the base frequency light passes through the frequency doubling crystal to obtain mixed light with different wavelengths;
and the temperature control system is used for changing the temperature of the frequency doubling crystal to realize wavelength separation of the frequency-converted light or adjusting the energy or power of the laser with different wavelengths under the condition of not moving the frequency doubling crystal.
In one possible implementation manner, the switching device further includes: a light splitting system comprising at least one dichroic mirror for separating the wavelengths of the mixed light.
In one possible implementation, the beam splitting system includes at least two dichroic mirrors, wherein the mirror of each dichroic mirror is arranged at a predetermined angle to the mixed light.
In one possible implementation, the optical splitting system includes:
the light-splitting device comprises a first dichroic mirror and a second dichroic mirror, wherein the mixed light comprises light with a first wavelength and light with a second wavelength, the mixed light transmits the light with the first wavelength through the first dichroic mirror, and the light with the second wavelength is reflected to the second dichroic mirror through the first dichroic mirror to be reflected and emitted.
In one possible implementation, the optical splitting system includes:
the mixed light comprises light with a first wavelength, light with a second wavelength and light with a third wavelength, the mixed light transmits the light with the first wavelength through the third dichroic mirror, the light with the second wavelength passes through the first dichroic mirror and is reflected to the second dichroic mirror to be reflected, and the light with the third wavelength transmits the light with the third wavelength and is reflected to the fifth dichroic mirror.
In one possible implementation, the temperature control system includes:
and the temperature control element is used for adjusting the temperature of the frequency doubling crystal to realize laser energy emitted at different wavelengths.
In one possible implementation, the frequency doubling crystal is a temperature sensitive nonlinear crystal.
In a second aspect, an embodiment of the present application provides another laser wavelength switching device, including:
the frequency doubling system comprises at least one frequency doubling element, the frequency doubling element is provided with a frequency doubling crystal, and the base frequency light passes through the frequency doubling system to obtain mixed light with different wavelengths;
a light splitting system for separately outputting light of different wavelengths by changing different dichroic mirror parameters;
the temperature control system changes the temperature of the frequency doubling crystal under the condition of not moving the frequency doubling crystal to realize the wavelength separation of the frequency-variable light or realize the adjustment of the energy or the power of the laser with different wavelengths.
In a possible implementation manner, the switching device further includes a window sheet including a first window sheet and a second window sheet, and the fundamental light is transmitted to the optical splitting system through the first window sheet and then emitted through the second window sheet.
In a possible implementation manner, the switching device further includes an absorption box disposed at a side of the light splitting system, for absorbing the laser light reflected by the mirror.
The laser wavelength switching device provided by the embodiment of the application comprises a frequency doubling system, at least one frequency doubling element and a frequency doubling crystal, wherein the frequency doubling element is provided with the frequency doubling crystal, and the base frequency light passes through the frequency doubling system to obtain mixed light with different wavelengths; a light splitting system including at least one dichroic mirror for separating wavelengths of the mixed light; and the temperature control system is used for monitoring laser energy with different wavelengths emitted after wavelength separation, and adjusting the temperature of the frequency doubling crystal according to the laser energy or adjusting the laser energy according to the temperature of the frequency doubling crystal. The device realizes wavelength separation after laser frequency conversion without moving the frequency doubling crystal, improves the energy/power of independently output fundamental frequency light, and can also realize the adjustment or calibration of the output energy of lasers with different wavelengths by adjusting the temperature of the frequency doubling crystal. Simple structure saves the volume, and stability is good, has expanded the application scope of laser instrument.
It should be understood that what is described in this summary section is not intended to limit key or critical features of the embodiments of the application, nor is it intended to limit the scope of the application. Other features of the present application will become apparent from the following description.
Drawings
The above and other features, advantages and aspects of various embodiments of the present application will become more apparent by referring to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements.
Fig. 1 shows a schematic structural diagram of a laser wavelength switching device according to an embodiment of the present application.
Fig. 2 shows a schematic structural diagram of another laser wavelength switching device according to an embodiment of the present application.
Fig. 3 shows a schematic structural diagram of another laser wavelength switching device according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of another laser wavelength switching device according to an embodiment of the present application.
Fig. 5 shows a schematic structural diagram of another laser wavelength switching device according to an embodiment of the present application.
In the figure, 10 is a frequency doubling system; 20 is a light splitting system; 30 is a temperature control system; 101 is a frequency doubling element; 102 is a frequency tripling element; 201 is a first dichroic mirror; 202 is a second dichroic mirror; 203 is a third dichroic mirror; 204 is a fourth dichroic mirror; 205 is a fifth dichroic mirror; 401 is a first window piece; 402 is a second window piece; 501. 502 is an absorbent box.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
The phase adaptation is realized by adjusting the temperature of the nonlinear crystal, and the purpose of outputting fundamental frequency (or frequency doubling) wavelength is achieved. The application takes the example of selecting a nonlinear optical crystal LBO (lithium triborate) crystal. LBO belongs to a negative biaxial crystal, and has the advantages of high damage threshold, wide acceptance angle, small dispersion angle and the like. The phase matching of the crystal is very sensitive to temperature, and the temperature change can cause the refractive index change of the crystal, so that the matching direction deviates from the original matching angle direction, and the frequency doubling efficiency of the crystal is influenced.
532nm and 355nm laser is obtained by double frequency and triple frequency of LBO crystal, and the double frequency LBO crystal selects I-type phase matching, i.e. 1064.0(o) + 1064.0(o) =532.0(e) The optimum phase matching angle is selected when the crystal temperature is 45 °, and the crystal parameters θ =90 ° and Φ =10.6 °. And controlling the temperature of the crystal by using the TEC. The temperature control plate is a mature temperature control plate in the market, and the temperature control precision is 0.01 ℃. The temperature measuring and feedback sensor is an NTC thermistor. Experiments show that when the temperature of the LBO crystal is 45 ℃, the peak power density is 215MW/cm2(160mJ single pulse energy, the diameter of a light spot is 5.2mm, the pulse width is 3.5ns), the repetition frequency is 10Hz, the corresponding frequency doubling efficiency is about 60%, when the LBO temperature is reduced to 30 ℃, the frequency doubling efficiency is reduced to be below 5%, and therefore the LBO crystal temperature is changed, the frequency doubling efficiency can be greatly reduced, and high-energy fundamental frequency light output can be obtained.
The frequency tripling LBO crystal selects the II phase matching, namely 1064.0(o) +532.0(e) =355(o), selects the optimum phase matching angle when the crystal temperature is 45 degrees, and selects the crystal parameters of theta =90 degrees and phi =43.7 degrees. 1064 fundamental frequency light firstly passes through a frequency doubling LBO crystal to obtain 1064nm and 532nm mixed light, and then the mixed light passes through a frequency tripling LBO crystal, when the temperature of the LBO crystal is 45 ℃, the corresponding frequency tripling efficiency is about 33 percent, when the temperature of the LBO crystal is reduced to 30 ℃, the frequency tripling efficiency is reduced to below 5 percent. In summary, energy size control at 1064nm, 532nm and 355nm can be achieved to some extent by controlling the LBO crystal temperature.
Fig. 1 shows a schematic structural diagram of a laser wavelength switching device according to an embodiment of the present application.
Referring to fig. 1, the laser wavelength switching device of the present embodiment includes:
the frequency doubling system 10 comprises at least one frequency doubling element 101, wherein the frequency doubling element 101 is provided with a frequency doubling crystal, and the fundamental frequency light passes through the frequency doubling crystal to obtain mixed light with different wavelengths; the frequency doubling crystal in this embodiment is an LBO crystal, and it should be noted that the frequency doubling crystal is not only an LBO crystal, but also any nonlinear crystal that is sensitive to temperature. When the fundamental frequency laser interacts with the nonlinear frequency doubling crystal, the variable frequency light different from the fundamental frequency light can be output when certain phase matching is met, and the change of the laser wavelength is realized. The phase matching mainly includes angle matching and temperature matching, the angle matching is to adjust the nonlinear optical crystal to the best matching angle with the fundamental frequency light by a mechanical adjusting means, and the temperature matching is to realize the best phase matching by setting the specific temperature of the nonlinear optical crystal. It should be noted that the apparatus of this embodiment is also suitable for higher frequency multiplication such as quadruple frequency.
And the temperature control system 30 changes the frequency doubling efficiency by adjusting the temperature of the frequency doubling crystal, realizes wavelength separation after laser frequency conversion under the condition of not moving the frequency doubling crystal, improves the energy/power of singly outputting the fundamental frequency light, and can also realize the adjustment or calibration of the output energy of the laser with different wavelengths by adjusting the temperature of the frequency doubling crystal. The temperature control system 30 may include, for example: a temperature monitoring element 301 for monitoring the temperature of the frequency doubling crystal; and the temperature control element 302 is used for realizing wavelength separation after laser frequency conversion under the condition of not moving the frequency doubling crystal, improving the energy/power of singly outputting the fundamental frequency light, and also realizing the adjustment of the temperature of the frequency doubling crystal or the calibration of the output energy of the laser with different wavelengths. The temperature monitoring element 301 may be, for example, an NTC thermistor, or a platinum resistor, and the temperature control element may control the temperature of the crystal by, for example, a TEC. The temperature control plate is a mature temperature control plate in the market, and the temperature control precision is 0.01 ℃. The temperature measurement may be a device that can be heated, such as a heating ceramic sheet, and is not particularly limited.
The laser wavelength switching device provided by the embodiment of the application comprises a frequency doubling system 10 and a temperature control system 30, wherein the temperature control system 30 comprises at least one frequency doubling element 10, the frequency doubling element 10 is provided with a frequency doubling crystal, base frequency light passes through the frequency doubling system to obtain mixed light with different wavelengths, the temperature control system monitors laser energy of the mixed light, and the temperature of the frequency doubling crystal is adjusted according to the laser energy or the laser energy is adjusted according to the temperature of the frequency doubling crystal. The device realizes the wavelength separation after laser frequency conversion without moving the frequency doubling crystal, improves the energy/power of independently outputting the fundamental frequency light, can also realize the adjustment or calibration of the output energy of the laser with different wavelengths by adjusting the temperature of the frequency doubling crystal, has simple structure, saves the volume, has good stability and expands the application range of the laser.
Fig. 2 shows a schematic structural diagram of another laser wavelength switching device according to an embodiment of the present application.
Referring to fig. 2, the laser wavelength switching device of the present embodiment includes:
The laser wavelength switching device provided by the embodiment of the application comprises a frequency doubling system 10 and a temperature control system 30, wherein the temperature control system 30 comprises at least one frequency doubling element 10, the frequency doubling element is provided with a frequency doubling crystal, base frequency light passes through the frequency doubling system to obtain mixed light with different wavelengths, the temperature control system monitors laser energy with different wavelengths emitted after wavelength separation by a light splitting system 20, and the temperature of the frequency doubling crystal is adjusted according to the laser energy or the laser energy is adjusted according to the temperature of the frequency doubling crystal. The device realizes the wavelength separation after laser frequency conversion without moving the frequency doubling crystal, improves the energy/power of independently outputting the fundamental frequency light, can also realize the adjustment or calibration of the output energy of the laser with different wavelengths by adjusting the temperature of the frequency doubling crystal, has simple structure, saves the volume, has good stability and expands the application range of the laser.
Fig. 3 shows a schematic structural diagram of another laser wavelength switching device according to an embodiment of the present application. Referring to fig. 3, the laser wavelength switching device of this embodiment realizes a device for switching 1064nm and 532nm wavelengths by changing the LBO temperature of the nonlinear crystal, the frequency doubling system includes a frequency doubling element 101, the light splitting system includes a first dichroic mirror 201 and a second dichroic mirror 202, wherein the mixed light includes light (1034 nm) with a first wavelength and light (532 nm) with a second wavelength, the mixed light transmits the light (1034 nm) with the first wavelength through the first dichroic mirror, the light (532 nm) with the second wavelength is reflected to the second dichroic mirror 202 through the first dichroic mirror 201, the first dichroic mirror 201 is highly transparent to the light with the 1064nm, the second dichroic mirror 202 is highly reflective to the light with the 532nm, and the LBO crystal is closely attached to the heat sink. Enabling the 1064nm fundamental frequency light to normally enter and pass through the LBO crystal, and obtaining 1064nm and 532nm mixed light; when the device is specifically installed, the first dichroic mirror 201 is installed, and the mirror is placed at an angle of 45 degrees with the mixed light as shown in the figure; then a second dichroic mirror 202 is installed, and the mirror and the mixed light are placed at an angle of 45 degrees; the divided 532nm light is injected into an NTC thermistor, and the laser energy is monitored; the LBO crystal temperature is adjusted to output 532 the highest energy. It should be noted that the apparatus of this embodiment is also suitable for higher frequency multiplication such as quadruple frequency.
If the light energy of the 1064nm fundamental frequency under the optimal frequency multiplication meets the use requirement, the light energy can be directly used;
if the output energy of the 1064nm fundamental frequency light needs to be further improved, the temperature of the LBO crystal is reduced, higher energy output can be obtained, and when the temperature is reduced to the lowest frequency doubling efficiency, the 1064nm light energy can be increased by 50% at most.
Further, the dynamic adjustment of the energy of 1064nm and 532nm laser can be indirectly realized by adjusting the temperature of the LBO crystal.
Fig. 4 is a schematic structural diagram of another laser wavelength switching device according to an embodiment of the present application. Referring to fig. 4, the present embodiment is a device for implementing 1064, 532nm, 355nm wavelength switching by changing LBO temperature of a nonlinear crystal, a frequency doubling system includes a frequency doubling element 101 and a frequency tripling element 102, and an optical splitting system includes:
third dichroic mirror 203, fourth dichroic mirror 204 and fifth dichroic mirror 205, wherein, the mixed light includes the light of first wavelength, the light of second wavelength and the light of third wavelength, and the mixed light passes through the light of first wavelength of third dichroic mirror 203 transmission, and the light of second wavelength passes through third dichroic mirror 203 reflects to fourth dichroic mirror 204 reflection and jets out, and the light of third wavelength reflects through fifth dichroic mirror 205 behind fourth dichroic mirror 204, and wherein, third dichroic mirror 203 is highly transparent to 1064nm light, highly reflects 532nm and 355nm light. The fourth dichroic mirror 204 is highly transparent to light of 1064nm and 355nm and highly reflective to light of 532nm, and the fifth dichroic mirror 205 is highly transparent to light of 1064nm and 532nm and highly reflective to light of 355 nm; the LBO crystal is tightly attached to the heat sink; the 1064nm fundamental frequency light is normally incident and sequentially passes through a frequency doubling LBO crystal and a frequency tripling LBO crystal, and then 1064nm, 532nm and 355nm three-wavelength mixed light is obtained; a third dichroic mirror 203, the mirror being placed at an angle of 45 ° to the mixed light as shown; a fourth dichroic mirror 205, the mirror being placed at an angle of 45 ° to the mixed light as shown; a fifth dichroic mirror, the lens and the mixed light are arranged at an angle of 45 degrees as shown in the figure; it should be noted that, in this embodiment, the setting of the angle may be specifically adjusted according to needs, and a specific angle value is not limited.
Firstly, adjusting the temperature of a frequency doubling LBO crystal, and the method is the same as the third embodiment; and adjusting the temperature of the frequency tripling LBO crystal to enable the frequency tripling LBO crystal to output the highest energy of 355 nm. If the energy of the laser with three wavelengths under the optimal frequency multiplication meets the use requirement, the laser can be directly used; if a maximum 1064nm light output is desired, the frequency doubling and frequency tripling LBO crystal temperature is lowered to the lowest frequency doubling efficiency. If the maximum 532nm light output is needed, the temperature of the frequency tripling LBO crystal is only reduced to the lowest frequency doubling efficiency.
Further, the dynamic adjustment of the energy of 1064nm, 532nm and 355nm laser can be indirectly realized by adjusting the temperature of the second frequency doubling LBO crystal and the third frequency doubling LBO crystal.
Fig. 5 shows a schematic structural diagram of another laser wavelength switching device according to an embodiment of the present application. Referring to fig. 5, the third and fourth examples described above separately implement wavelength switching by separating different wavelengths of light through a dichroic mirror. In practical applications, it is sometimes necessary to output multiple wavelengths of light in a mixed coaxial manner, or to ensure that each wavelength of light is on the same optical axis when outputting each wavelength of light separately, and in this case, the structure is modified as shown in fig. 5. The frequency doubling system comprises a frequency doubling element 101 and a frequency tripling element 102, the switching device further comprises a window sheet, the window sheet comprises a first window sheet 401 and a second window sheet 402, the first window sheet 401 is highly transparent to base frequency light 1064nm, the second window sheet 402 is highly transparent to light 1064nm, light 532nm and light 355nm, and the base frequency light is emitted after being transmitted to the light splitting system through the first window sheet 401 and is emitted through the second window sheet 102. The switching device further comprises absorption boxes 501 and 502 which are arranged on the side surfaces of the light splitting system and used for absorbing the laser reflected by the lens. The light splitting system 20 can realize independent output of laser with different wavelengths by changing parameters of different dichroic mirrors, the two dichroic mirrors are placed at 90 degrees, and structural parts can be detached and replaced. The device is used for compensating deflection of refraction of the lens on a light path and realizing coaxial output of three-wavelength laser and mixed laser. The 1064nm fundamental frequency light is sequentially incident into a second frequency doubling LBO crystal and a third frequency doubling LBO crystal; selecting two dichroic mirrors with 532nm light high transmittance and 1064nm and 355nm light high reflectance, and monitoring 532nm light energy by an energy meter; adjusting the temperature of the frequency doubling LBO crystal to enable 532 output energy to be the highest, and finishing frequency doubling regulation; selecting two dichroic mirrors with 355nm light high-transmittance and 1064nm and 532nm light high-reflectance, and monitoring 355nm light energy by an energy meter; the frequency tripling LBO crystal temperature is adjusted to allow 355 the highest output energy, at which point the frequency tripling adjustment is complete. It should be noted that the apparatus of this embodiment is also suitable for higher frequency multiplication such as quadruple frequency.
When three-wavelength mixed output is needed, the light splitting system 20 is removed, and the temperature of the second frequency doubling crystal and the third frequency doubling crystal is changed to realize different energy distribution of three wavelengths;
when 1064nm fundamental frequency light output is required, the spectroscopic system 20 selects the spectroscopic parameters of 1064nm light high transmittance, 532nm and 355nm light high reflectance, and simultaneously reduces the temperature of the second and third frequency doubling systems to the lowest frequency doubling efficiency, so that the 1064nm fundamental frequency light output can be maximally obtained, and the energy can be dynamically adjusted within a certain range;
when 532nm fundamental frequency light output is required, the spectroscopic system 20 selects the spectroscopic system with 532nm light high transmittance, 1064nm light high reflection and 355nm light high reflection, and simultaneously reduces the temperature of the triple frequency system to the lowest frequency doubling efficiency, so that the 532nm fundamental frequency light output can be maximally obtained, and the energy can be dynamically adjusted within a certain range;
when 355nm fundamental frequency light output is required, the spectroscopic system 20 selects the spectroscopic parameters of 355nm light high transmittance and 1064nm and 532nm light high reflectance, so that the 355nm fundamental frequency light output can be maximally obtained, and the energy can be dynamically adjusted within a certain range.
It is to be understood that reference herein to "at least one" means one or more and "a plurality" means two or more. In the description of the embodiments of the present application, "/" means "or" unless otherwise specified, for example, a/B may mean a or B; "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, in order to facilitate clear description of technical solutions of the embodiments of the present application, in the embodiments of the present application, terms such as "first" and "second" are used to distinguish the same items or similar items having substantially the same functions and actions. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or importance, nor do the terms "first," "second," etc. denote any order or importance.
The above description is provided for illustrative embodiments of the present application and not for the purpose of limiting the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (10)
1. A laser wavelength switching device, comprising:
the frequency doubling system comprises at least one frequency doubling element, the frequency doubling element is provided with a frequency doubling crystal, and the base frequency light passes through the frequency doubling crystal to obtain mixed light with different wavelengths;
and the temperature control system is used for changing the temperature of the frequency doubling crystal to realize wavelength separation of the frequency-converted light or adjusting the energy or power of the laser with different wavelengths under the condition of not moving the frequency doubling crystal.
2. The switching device according to claim 1, further comprising: a light splitting system comprising at least one dichroic mirror for separating the wavelengths of the mixed light.
3. The switching device of claim 2, wherein the beam splitting system comprises at least two dichroic mirrors, wherein the mirror of each dichroic mirror is disposed at a predetermined angle to the mixed light.
4. The switching device according to claim 3, wherein the optical splitting system comprises:
the light-splitting device comprises a first dichroic mirror and a second dichroic mirror, wherein the mixed light comprises light with a first wavelength and light with a second wavelength, the mixed light transmits the light with the first wavelength through the first dichroic mirror, and the light with the second wavelength is reflected to the second dichroic mirror through the first dichroic mirror to be reflected and emitted.
5. The switching device according to claim 3, wherein the optical splitting system comprises:
third dichroic mirror, fourth dichroic mirror and fifth dichroic mirror, wherein, the mixed light includes the light of first wavelength, the light of second wavelength and the light of third wavelength, and the mixed light passes through the light of first wavelength of third dichroic mirror transmission, and the light of second wavelength passes through the third dichroic mirror reflects the reflection of fourth dichroic mirror and jets out, and the light of third wavelength is passed through after the fourth dichroic mirror reflection and jets out.
6. The switching device according to any one of claims 1 to 5, wherein the temperature control system comprises:
the temperature monitoring element is used for monitoring the temperature of the frequency doubling crystal;
and the temperature control element is used for changing the temperature of the frequency doubling crystal under the condition of not moving the frequency doubling crystal to realize wavelength separation of the frequency-converted light or realize adjustment of the energy or power of the laser with different wavelengths.
7. The switching device according to any of claims 1-5, wherein the frequency doubling crystal is a temperature sensitive nonlinear crystal.
8. A laser wavelength switching device, comprising:
the frequency doubling system comprises at least one frequency doubling element, the frequency doubling element is provided with a frequency doubling crystal, and the base frequency light passes through the frequency doubling system to obtain mixed light with different wavelengths;
a light splitting system for separately outputting light of different wavelengths by changing different dichroic mirror parameters;
and the temperature control system is used for changing the temperature of the frequency doubling crystal to realize wavelength separation of the frequency-converted light or adjusting the energy or power of the laser with different wavelengths under the condition of not moving the frequency doubling crystal.
9. The switching device according to claim 8, further comprising a window sheet including a first window sheet and a second window sheet, wherein the fundamental light is transmitted to the optical splitting system through the first window sheet and then emitted through the second window sheet.
10. The switching device according to claim 8 or 9, further comprising an absorption box disposed at a side of the spectroscopic system for absorbing the mirror reflection light.
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