CN110429456B - Combined KTP frequency doubling device capable of expanding temperature adaptation range and adjusting method thereof - Google Patents
Combined KTP frequency doubling device capable of expanding temperature adaptation range and adjusting method thereof Download PDFInfo
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Abstract
The invention discloses a combination KTP frequency doubling device with an expandable temperature adaptation range and an adjusting method thereof, wherein the combination KTP frequency doubling device comprises a combination KTP frequency doubling device with the expandable temperature adaptation range being the sum of half peak temperature widths of two crystals; the combined KTP frequency doubling device is formed by connecting two KTP crystals with optimal phase matching temperature difference delta T in series; the KZ surfaces of the two KTP crystals are mutually perpendicular, and the polarization direction of fundamental frequency light and the KZ surfaces of the KTP crystals form an angle of 45 degrees; the two KTP crystals are connected in series through an adjusting device; the adjusting device consists of two single crystal adjusting mechanisms for installing single KTP crystals and a connecting piece, and the two single crystal adjusting mechanisms are fixedly connected through the connecting piece; the combined KTP frequency doubling device with the expandable temperature adaptation range and the adjusting method thereof can effectively expand the temperature adaptation range of the KTP frequency doubling device, and compared with the condition that the KZ faces of two KTP crystals are parallel, the frequency doubling conversion stability is good.
Description
Technical Field
The invention relates to a combined KTP frequency doubling device capable of expanding a temperature adaptation range and an adjusting method thereof, belonging to the technical field of nonlinear optics.
Background
Green laser in industrial productionThe fields of physical and medical treatment, military and the like have wide and important application, such as field operations of laser processing, high-voltage line maintenance and the like, laser treatment, beauty treatment, laser dizzy and the like; along with the maturity of high-quality KTP crystal growth technology, the KTP frequency doubling green light laser is gradually matured; currently, KTP frequency-doubled lasers have become the main way to obtain green laser light. The frequency doubling device is a key device of the frequency doubling laser, and the 1.064 mu m fundamental frequency laser can be converted into the 0.53 mu m green laser by KTP crystal along the phase matching direction by utilizing the frequency doubling effect; the cutting angle of the KTP frequency doubling device is usuallyThe nonlinear coefficient of the crystal in the direction is guaranteed to be maximum at normal temperature, and the frequency doubling conversion efficiency is guaranteed to be highest.
When the frequency doubling green laser is used for field and other environmental operations, the applicable temperature range is required to be large; for a KTP frequency doubling device, when the temperature changes, the refractive index of the crystal also changes, and frequency doubling phase mismatch is generated, so that the frequency doubling conversion efficiency is reduced along with the temperature change; the KTP frequency doubling crystal cut at normal temperature has drastically reduced frequency doubling conversion efficiency at high and low temperatures, and even cannot emit green laser; therefore, the laser used under the conditions of field operation and the like needs to take temperature control measures. However, the temperature control device has the following disadvantages: (1) the temperature control needs preheating or heat dissipation time; (2) when the battery is powered, the limited electric energy is consumed; (3) the temperature control device can increase the volume and the weight of the laser; (4) for a laser with larger power, the temperature control difficulty is also larger; therefore, there is a need to design frequency doubling devices with large temperature application ranges. Chinese patent application No.: 200710098586.X discloses a nonlinear optical crystal laser frequency multiplier capable of expanding the adaptive range of ambient temperature, which comprises a first nonlinear optical crystal and a second nonlinear optical crystal, wherein the two nonlinear optical crystals are two nonlinear optical crystals with the same material, the nonlinear optical crystals are cut at different cutting angles, and the incident end face and the emergent end face of the first nonlinear optical crystal and the second nonlinear optical crystal are plated with fundamental frequency optical wavelength lambda 1 And the wavelength lambda of the frequency multiplication light 2 An antireflection film of a first nonlinear optical crystal, an exit end face of a first nonlinear optical crystal, and a second nonlinear optical crystalThe incident end faces of the nonlinear optical crystals are arranged in a pasting way; the laser frequency multiplier compensates the influence of the change of the ambient temperature on the frequency multiplication conversion efficiency of the nonlinear optical crystal, expands the application range of the nonlinear optical crystal to the ambient temperature in the frequency multiplication process, and provides an important way for the application of the nonlinear optical crystal; in the technical scheme, two KTP crystals with parallel KZ planes are connected in series, but only half-peak temperature width is provided in the embodiment of the technical scheme, and the change condition of frequency doubling light pulse energy (or frequency doubling conversion efficiency) along with temperature in the half-peak temperature width is not provided; in addition, in the prior art, two KTP crystals with the same cutting angle and vertical KZ plane are connected in series to perform frequency multiplication, but the frequency multiplication conversion efficiency is improved within the half-peak temperature width range of a single crystal, and the temperature application range of a frequency multiplication device cannot be expanded; therefore, in order to solve the above problems, the invention designs a combined KTP frequency doubling device capable of expanding the temperature adaptation range and an adjusting method thereof, which expands the temperature adaptation range of the device and keeps the frequency doubling conversion efficiency near the maximum frequency doubling conversion efficiency of a monolithic crystal in the whole temperature adaptation range.
Disclosure of Invention
In order to solve the problems, the invention provides a combined KTP frequency doubling device capable of expanding the temperature adaptation range and an adjusting method thereof, which can effectively expand the temperature adaptation range of the KTP frequency doubling device, and has good frequency doubling conversion stability compared with the condition that the KZ surfaces of two KTP crystals are parallel.
The invention relates to a combined KTP frequency doubling device with an expandable temperature adaptation range, which comprises a combined KTP frequency doubling device with the expandable temperature adaptation range being the sum of half peak temperature width delta T of two crystals; the combined KTP frequency doubling device is formed by connecting two KTP crystals with optimal phase matching temperature difference delta T in series; the KZ surfaces of the two KTP crystals are mutually perpendicular, and the polarization direction of fundamental frequency light and the KZ surfaces of the KTP crystals form an angle of 45 degrees; the two KTP crystals are connected in series through an adjusting device; the adjusting device consists of two single crystal adjusting mechanisms for installing single KTP crystals and a connecting piece, and the two single crystal adjusting mechanisms are fixedly connected through the connecting piece; the single crystal adjusting mechanism comprises a spherical crystal seat, an inner spherical cylindrical shell and a spherical crystal seat adjusting device; the single KTP crystal is fixedly arranged at the center of the spherical crystal seat; the spherical crystal seat is arranged at the center of the inner spherical cylindrical shell and is locked and screwed in the inner spherical cylindrical shell through the spherical crystal seat; the spherical crystal seat adjusting device consists of a leveling pin fixing screw, a leveling pin and a leveling screw; the leveling pin is fixed on the inner spherical cylindrical shell through a leveling pin fixing screw; the leveling screw passes through the leveling pin and is connected with the spherical crystal seat, and when the single KTP crystal is installed with the single crystal adjusting mechanism, the single KTP crystal is fixed in the crystal fixing hole at the center of the spherical crystal seat by a set screw or viscose; then placing the spherical crystal seat in the inner spherical cylindrical shell, and fixing the spherical crystal seat in the inner spherical cylindrical shell by fastening screws; then the upper shell and the lower shell of the inner spherical cylindrical shell are connected together by connecting bolts; fixing the leveling pins on the inner spherical cylindrical shell by using leveling pin fixing screws, wherein the leveling screws are arranged on the leveling pins, and the inclination degree of the spherical crystal seat in the inner spherical cylindrical shell can be adjusted by adjusting 4 leveling screws; after the single crystal adjusting mechanism is assembled, the two single crystal adjusting mechanisms are connected together by the connecting piece to form the combined KTP frequency doubling device.
Further, the surfaces of the two KTP crystals are parallel to each other, and the light transmission holes of the two KTP crystals are aligned to each other.
Further, a crystal fixing hole for mounting the KTP crystal is formed in the center of the spherical crystal seat; four leveling grooves for installing leveling screws are formed in the front side of the spherical crystal seat.
Further, a single piece of KTP crystal is fixed in the spherical crystal seat by a set screw.
As a preferred embodiment, a single piece of said KTP crystals is fixed in a spherical crystal holder by means of an adhesive.
As a preferred embodiment, the inner spherical surface cylindrical shell consists of an upper shell and a lower shell, and the upper shell and the lower shell are fixedly connected through connecting bolts.
Further, the half peak temperature width of the single KTP crystal is Δt, and the frequency multiplication of the single KTP crystal adopts ii-type phase matching, the polarization direction of the fundamental frequency light incident along the phase matching direction forms an angle of 45 ° with the KZ plane of the KTP crystal, the fundamental frequency light entering the KTP crystal is decomposed into o light and e light, the amplitudes of the o light and e light are equal, and the corresponding phase matching conditions are as follows:
wherein n is refractive index, T i For the optimal phase matching temperature of the ith crystal, ω is the fundamental light angular frequency, 2ω is the doubled light angular frequency,is the ith crystal at T i Phase matching angle at temperature.
Further, both end faces of each KTP crystal are plated with antireflection films with the wavelengths of 1.064 μm and 0.532 μm.
Further, the KZ surfaces of the two KTP crystals are mutually perpendicular, the polarization direction of linear polarization fundamental frequency light with the wavelength of 1.064 μm and the KZ surfaces of the two KTP crystals are both 45 degrees, fundamental frequency light sequentially passes through the two KTP crystals for frequency multiplication, and the fundamental frequency light meets the frequency multiplication phase matching condition in the respective temperature range of the two KTP crystals; the frequency multiplication light generated by the former KTP crystal does not meet the frequency multiplication phase matching condition in the latter KTP crystal, and does not generate inverse conversion with the fundamental frequency light coupling in the latter KTP crystal, so that the influence of the phase mismatch amount of the two KTP crystals on frequency multiplication caused by temperature change is mutually compensated, and the total frequency multiplication conversion efficiency is the sum of the frequency multiplication conversion efficiency of the two crystals when the temperature is T; the frequency doubling conversion efficiency of the combined KTP frequency doubling device is kept at the optimal frequency doubling conversion efficiency of a single KTP crystal within the temperature range of about 2 delta T, the temperature application range of the combined KTP frequency doubling device is effectively expanded to 2 delta T, and the frequency doubling conversion efficiency is stable.
The invention relates to a method for adjusting a combined KTP frequency doubling device with an expandable temperature adaptation range, which comprises the following steps:
the first step, a single crystal adjusting mechanism with a single KTP crystal is linked together by a connecting piece, and the light transmission holes of the two KTP crystals are aligned with each other; adjusting the front KTP crystal and the rear KTP crystal by adjusting a spherical crystal seat adjusting device, so that the surfaces of the two KTP crystals are parallel to each other;
secondly, mounting the assembled combined KTP frequency doubling device in a temperature control box, and adjusting the combined KTP frequency doubling device to enable the polarization direction of fundamental frequency light to form an angle of 45 degrees with the KZ plane of the KTP crystal and enable the fundamental frequency light to vertically enter the temperature control box; the fundamental frequency light pulse energy is kept unchanged, and a curve of the frequency multiplication conversion efficiency of the combined KTP frequency multiplication device along with the temperature change is measured, so that the frequency multiplication conversion efficiency is basically kept unchanged within the range of 2 delta T; otherwise, fine-tuning the front and back KTP crystals to make the temperature curve of the combined KTP frequency doubling device meet the requirement.
Compared with the prior art, the temperature-adaptive range-expandable combined KTP frequency doubling device and the adjusting method thereof realize the mutual compensation of the influence of the KTP crystal phase mismatch amount caused by temperature change on the frequency doubling conversion efficiency in the frequency doubling process through the phase matching design of the two KTP crystals, so that the temperature-adaptive range of the combined KTP frequency doubling device is expanded to 2 delta T, and the frequency doubling conversion efficiency is stable.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the combined KTP frequency doubling device of the present invention.
FIG. 2 is a schematic view of a single crystal adjustment mechanism and attachment means mounting structure of the present invention.
FIG. 3 is a schematic view of the structure of the single crystal adjusting mechanism of the present invention.
Fig. 4 is a schematic view of the spherical crystal seat structure of the present invention.
Fig. 5 is a schematic diagram showing the decomposition of fundamental light in a monolithic KTP crystal of the present invention.
FIG. 6 is a schematic diagram showing the decomposition of fundamental light in KTP crystals when two KTP crystals of the present invention are connected in series.
Fig. 7 is a graph showing the change of the frequency-doubled light pulse energy with temperature according to example 1 of the present invention.
FIG. 8 is a schematic diagram showing the structure of two KTP crystals with parallel KZ planes and the decomposition of fundamental light in the KTP crystals.
FIG. 9 is a graph showing normalized frequency doubling conversion efficiency of two KTP crystals with parallel KZ planes according to the present invention as a function of crystal spacing and temperature.
FIG. 10 is a graph showing normalized frequency doubling conversion efficiency with temperature when the distance between two KTP crystals with parallel KZ planes is 13cm (equivalent to the distance of 0 cm).
FIG. 11 is a graph showing the energy of a double frequency light pulse as a function of temperature when two KTP crystals with parallel KZ planes are cascaded at different pitches;
wherein, the graph (a) is a graph of the variation of the frequency multiplication light pulse energy of a single KTP crystal KTP1 with temperature; FIG. (b) is a graph showing the variation of the energy of a single KTP crystal KTP2 double frequency light pulse with temperature; FIG. (c) is a graph showing the variation of the energy of the double frequency light pulse with temperature when the distance between two KTP crystals is 13 cm; graph (d) is a graph of frequency multiplication light pulse energy with temperature change when the distance between two KTP crystals is 9.8 cm; graph (e) is a graph of frequency multiplication light pulse energy with temperature change when the distance between two KTP crystals is 6.5 cm; and (f) is a graph of the energy of the double frequency light pulse with the temperature change when the distance between two KTP crystals is 3.3 cm.
The components in the drawings are marked as follows: 1-KTP crystal, 2-single crystal adjusting mechanism, 21-spherical crystal seat, 22-inner spherical cylindrical shell, 221-upper shell, 222-lower shell, 223-connecting bolt, 23-spherical crystal seat adjusting device, 231-leveling pin fixing screw, 232-leveling pin, 233-leveling screw, 24-spherical crystal seat locking screw, 3-connecting piece, 4-crystal fixing hole, 5-leveling groove, 6-set screw, KTP 1-front KTP crystal, KTP 2-rear KTP crystal.
Detailed Description
The combined KTP frequency doubling device with the expandable temperature adaptation range shown in the figures 1 to 6 comprises a combined KTP frequency doubling device with the expandable temperature adaptation range being the sum of the half peak temperature width delta T of each of the two crystals; the combined KTP frequency doubling device is formed by connecting two KTP crystals 1 with optimal phase matching temperature difference delta T in series; the KZ surfaces of the two KTP crystals 1 are mutually perpendicular, and the polarization direction of fundamental frequency light and the KZ surfaces of the KTP crystals 1 form an angle of 45 degrees; two KTP crystals 1 are connected in series through an adjusting device; the adjusting device consists of two single crystal adjusting mechanisms 2 for installing single KTP crystals and a connecting piece 3, and the two single crystal adjusting mechanisms 2 are fixedly connected through the connecting piece 3; the single crystal adjusting mechanism 2 comprises a spherical crystal seat 21, an inner spherical cylindrical shell 22 and a spherical crystal seat adjusting device 23; the single KTP crystal 1 is fixedly arranged at the center of the spherical crystal seat 21; the spherical crystal seat 21 is arranged at the center of the inner spherical cylindrical shell 22 and is fixed in the inner spherical cylindrical shell 22 through the spherical crystal seat locking screw 24; the spherical crystal seat adjusting device 23 consists of a leveling pin fixing screw 231, a leveling pin 232 and a leveling screw 233; the leveling pin 232 is fixed on the inner spherical cylindrical shell 22 through a leveling pin fixing screw 231; the leveling screw 233 passes through the leveling pin 232 and is connected with the spherical crystal seat 21.
The surfaces of the two KTP crystals 1 are parallel to each other, and the light transmission holes of the two KTP crystals 1 are aligned to each other.
The center of the spherical crystal seat 21 is provided with a crystal fixing hole 4 for mounting KTP crystals; four leveling grooves 5 for installing leveling screws are formed in the front side of the spherical crystal seat 21.
The single KTP crystal 1 is fixed in the spherical crystal seat 21 by a set screw 6 or an adhesive.
The inner spherical cylindrical shell 22 is composed of an upper shell 221 and a lower shell 222, and the upper shell 221 and the lower shell 222 are fixedly connected through a connecting bolt 223.
The half peak temperature width of the single KTP crystal 1 is delta T, frequency multiplication of the single KTP crystal adopts II-type phase matching, the polarization direction of fundamental frequency light incident along the phase matching direction forms an angle of 45 degrees with the KZ plane of the KTP crystal 1, the fundamental frequency light entering the KTP crystal is decomposed into o light and e light, the amplitudes of the o light and the e light are equal, and the corresponding phase matching conditions are as follows:
wherein n is refractive index, T i For the optimal phase matching temperature of the ith crystal, ω is the fundamental light angular frequency, 2ω is the doubled light angular frequency,is the ith crystal inT i Phase matching angle at temperature.
Both end surfaces of each KTP crystal 1 are plated with antireflection films with the wavelengths of 1.064 μm and 0.532 μm.
The KZ surfaces of the two KTP crystals 1 are mutually perpendicular, and the polarization direction of linear polarization fundamental frequency light with the wavelength of 1.064 mu m and the KZ surfaces of the two KTP crystals 1 form an angle of 45 degrees.
The invention relates to a method for adjusting a combined KTP frequency doubling device with an expandable temperature adaptation range, which comprises the following steps:
the first step, a single crystal adjusting mechanism 2 with a single KTP crystal 1 is linked together by a connecting piece 3, and the light transmission holes of the two KTP crystals 1 are aligned with each other; the spherical crystal seat adjusting device 23 is adjusted to adjust the front KTP crystal KTP1 and the rear KTP crystal KTP2, so that the surfaces of the front KTP crystal KTP1 and the rear KTP crystal KTP2 are parallel to each other; specifically, when the single KTP crystal 1 and the single crystal adjusting mechanism 2 are installed, the single KTP crystal 1 is fixed in the crystal fixing hole 4 at the center of the spherical crystal seat 21 by a set screw 6 or viscose; then the spherical crystal seat 21 is arranged in the inner spherical cylindrical shell 22, and then the spherical crystal seat tightening screw 24 is fixed in the inner spherical cylindrical shell 22; then the upper shell 221 and the lower shell 222 of the inner spherical cylindrical shell 22 are connected together by a connecting bolt 223; the leveling pins 232 are fixed on the inner spherical cylindrical shell 22 by using leveling pin fixing screws 231, leveling screws 233 are arranged on the leveling pins 232, and the inclination degree of the spherical crystal seat 21 in the inner spherical cylindrical shell 22 can be adjusted by adjusting 4 leveling screws 233; after the single crystal adjusting mechanism 2 is assembled, the two single crystal adjusting mechanisms are connected together by the connecting piece 3 to form a combined KTP frequency doubling device;
secondly, mounting the assembled combined KTP frequency doubling device in a temperature control box, and adjusting the combined KTP frequency doubling device to enable the polarization direction of fundamental frequency light to form an angle of 45 degrees with the KZ plane of the KTP crystal and enable the fundamental frequency light to vertically enter the temperature control box; the fundamental frequency light pulse energy is kept unchanged, and a curve of the frequency multiplication conversion efficiency of the combined KTP frequency multiplication device along with the temperature change is measured, so that the frequency multiplication conversion efficiency is basically kept unchanged within the range of 2 delta T; otherwise, fine-tuning the front and back KTP crystals to make the temperature curve of the combined KTP frequency doubling device meet the requirement.
Example 1:
the invention relates to a combined KTP frequency doubling device capable of expanding the temperature adaptation range, which is composed of two KTP crystals with the length of 6mm and the delta T of about 30 ℃, when the fundamental frequency light pulse energy is 100mJ, the temperature change curve of the frequency doubling light pulse energy is shown in figure 7, the frequency doubling conversion efficiency is basically kept at about 50% in the temperature range of about 60 ℃, and the frequency doubling conversion is very stable.
Example 2:
the following are the Chinese patent application numbers of the present invention and the comparative document: 200710098586.X comparison, corresponding data provided:
as shown in fig. 8, when the KZ planes of two KTP crystals are parallel, the frequency doubling conversion efficiency η is calculated by formulas (2), (3):
wherein Deltaκ 1 、Δκ 2 Phase mismatch in two crystals, L crystal length, L crystal spacing, Δκ a Phase mismatch in air;
simulation and experiment are carried out by taking the length of two KTP crystals as 6cm, the cutting angles (90 degrees, 23.4 degrees) and (90 degrees, 22.4 degrees), and the results are shown in figures 9 to 11, because the two KTP crystals with parallel KZ planes are cascaded, the total frequency doubling light is the coherent superposition of frequency doubling light generated by the two KTP crystals, and the pulse energy (or frequency doubling conversion efficiency) of the frequency doubling light is greatly changed along with the temperature change although the half-peak temperature width of the frequency doubling light is increased, and the stability is poor.
The above embodiments are merely preferred embodiments of the present invention, and all changes and modifications that come within the meaning and range of equivalency of the structures, features and principles of the invention are therefore intended to be embraced therein.
Claims (8)
1. The utility model provides a combination KTP frequency doubling device of scalable temperature accommodation which characterized in that: the temperature-adaptive temperature-variable frequency synthesizer comprises a combined KTP frequency doubling device with the extensible temperature adaptive range being the sum of the half peak temperature width delta T of two crystals; the combined KTP frequency doubling device is formed by connecting two KTP crystals with optimal phase matching temperature difference delta T in series; the KZ surfaces of the two KTP crystals are mutually perpendicular, and the polarization direction of fundamental frequency light and the KZ surfaces of the KTP crystals form an angle of 45 degrees; the two KTP crystals are connected in series through an adjusting device; the adjusting device consists of two single crystal adjusting mechanisms for installing single KTP crystals and a connecting piece, and the two single crystal adjusting mechanisms are fixedly connected through the connecting piece; the single crystal adjusting mechanism comprises a spherical crystal seat, an inner spherical cylindrical shell and a spherical crystal seat adjusting device; the single KTP crystal is fixedly arranged at the center of the spherical crystal seat; the spherical crystal seat is arranged at the center of the inner spherical cylindrical shell and is locked and screwed in the inner spherical cylindrical shell through the spherical crystal seat; the spherical crystal seat adjusting device consists of a leveling pin fixing screw, a leveling pin and a leveling screw; the leveling pin is fixed on the inner spherical cylindrical shell through a leveling pin fixing screw; the leveling screw passes through the leveling pin and is connected with the spherical crystal seat;
the surfaces of the two KTP crystals are parallel to each other, and the light transmission holes of the two KTP crystals are aligned to each other;
the center of the spherical crystal seat is provided with a crystal fixing hole for mounting a KTP crystal; four leveling grooves for installing leveling screws are formed in the front side of the spherical crystal seat.
2. The combined KTP frequency doubling device of the expandable temperature adaptation range of claim 1, wherein: the single KTP crystal is fixed in the spherical crystal seat through a set screw.
3. The combined KTP frequency doubling device of the expandable temperature adaptation range of claim 1, wherein: and the single KTP crystal is fixed in the spherical crystal seat through viscose.
4. The combined KTP frequency doubling device of the expandable temperature adaptation range of claim 1, wherein: the inner spherical surface cylindrical shell consists of an upper shell and a lower shell, and the upper shell and the lower shell are fixedly connected through connecting bolts.
5. The combined KTP frequency doubling device of the expandable temperature adaptation range of claim 1, wherein: the half peak temperature width of the single KTP crystal is delta T, frequency multiplication of the single KTP crystal adopts II-type phase matching, the polarization direction of fundamental frequency light incident along the phase matching direction forms an angle of 45 degrees with the KZ plane of the KTP crystal, the fundamental frequency light entering the KTP crystal is decomposed into o light and e light, the amplitudes of the o light and the e light are equal, and the corresponding phase matching conditions are as follows:
wherein n is refractive index, T i For the optimal phase matching temperature of the ith crystal, ω is the fundamental light angular frequency, 2ω is the doubled light angular frequency,is the ith crystal at T i Phase matching angle at temperature.
6. The combination KTP frequency doubling device of the expandable temperature adaptation range according to claim 1 or 5, wherein: both end surfaces of each KTP crystal are plated with antireflection films with the wavelength of 1.064 μm and 0.532 μm.
7. The combined KTP frequency doubling device of the expandable temperature adaptation range of claim 1, wherein: the KZ surfaces of the two KTP crystals are mutually perpendicular, and the polarization direction of linear polarization fundamental frequency light with the wavelength of 1.064 mu m and the KZ surfaces of the two KTP crystals form an angle of 45 degrees.
8. A method for adjusting a combined KTP frequency doubling device using the expandable temperature adaptation range according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:
the first step, a single crystal adjusting mechanism with a single KTP crystal is linked together by a connecting piece, and the light transmission holes of the two KTP crystals are aligned with each other; adjusting the front KTP crystal and the rear KTP crystal by adjusting a spherical crystal seat adjusting device, so that the surfaces of the two KTP crystals are parallel to each other;
secondly, mounting the assembled combined KTP frequency doubling device in a temperature control box, wherein the polarization direction of fundamental frequency light forms an angle of 45 degrees with the KZ plane of the KTP crystal, and the fundamental frequency light is vertically incident; the fundamental frequency light pulse energy is kept unchanged, the frequency multiplication conversion efficiency of the combined KTP frequency multiplication device is measured along with the temperature change curve, and the frequency multiplication conversion efficiency is basically kept unchanged within an extended temperature range of 2 delta T; otherwise, fine-tuning the front and back KTP crystals to make the temperature curve of the combined KTP frequency doubling device meet the requirement.
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