Hydroxyyttrium carbonate deep ultraviolet nonlinear optical crystal as well as preparation method and application thereof
Synthesis of hydroxy yttrium carbonate crystals by hydrothermal method solves the problems of layered characteristics and easy delivery during the growth of existing deep ultraviolet nonlinear optical crystals, achieving high-purity and large-size crystal growth, meeting the basic conditions for deep ultraviolet application.
Patent Information
- Application Number
- CN202510056931.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2025-04-18
AI Technical Summary
The existing deep ultraviolet nonlinear optical crystals have problems of layered properties and easy delirium during growth, which limits their application in laser technology.
Yttrium hydroxycarbonate (Y(CO)3OH) crystals were synthesized by hydrothermal method, and yttrium nitrate hexahydrate and cyanide were used as raw materials to control the growth conditions to obtain large-sized crystals.
The growth of large-size Y(CO)3OH crystals with high purity (more than 98%) was achieved, and the basic conditions for deep ultraviolet applications were met, including a band gap of more than 6.2 eV, frequency doubling efficiency is comparable to KDP and a birefringence between [0.06, 0.12].
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Abstract
Description
Technical Field
[0001] The invention relates to a yttrium hydroxycarbonate nonlinear optical crystal and a preparation method and application thereof, belonging to the field of deep ultraviolet nonlinear optical crystals. Background Art
[0002] Deep ultraviolet lasers have the characteristics of high single-photon energy, short wavelength, and high spatial resolution, and have important application value in laser medical treatment, precision instrument processing, laser lithography, etc. Deep ultraviolet nonlinear laser crystals directly obtain deep ultraviolet lasers through frequency doubling, multiple frequency doubling, sum frequency, difference frequency, optical parametric oscillation, and optical parametric amplification technologies, and are the key materials for realizing all-solid-state deep ultraviolet laser technology.
[0003] Currently commonly used deep ultraviolet crystals include LiB3O5 (LBO), KBe2BO3F2 (KBBF), CsB3O5 (CBO), CsLiB6O 10 (CLBO), etc. The KBBF crystal grown by the team of Academician Chen Chuangtian obtained a 266nm laser output with an average power of 7.86W as a quadruple frequency crystal, but the atoms inside the KBBF crystal are stacked layer by layer, with a strong layered characteristic, which makes it difficult to grow a thicker crystal in the c direction, and the synthetic raw materials contain beryllium oxide, which is toxic, which further limits its application. Compared with KBBF crystals, CLBO crystals have no layered habits and can grow large crystals, but they are very easy to deliquesce, which affects their further application. Therefore, there is an urgent need to overcome the layered habits and have stable performance of nonlinear optical crystals. To achieve nonlinear optical crystals for deep ultraviolet applications, at least three basic conditions must be met: first, the band gap reaches 6.2eV or more; second, the frequency doubling efficiency is equivalent to KDP; third, the birefringence is between [0.06,0.12] to achieve birefringence phase matching.
[0004] In 2007, Takeshi Tahara synthesized Y(CO)3OH using formic acid and yttrium hydroxide gel. However, formic acid is volatile and should not be exposed to the air for a long time. It needs to be used in a ventilated environment. The raw materials used in this patent are yttrium nitrate hexahydrate and cyanuric acid, both of which are solid and will not sublimate, and have stable chemical properties. The method provided by this patent can synthesize a large amount of pure Y(CO)3OH crystals, based on the yttrium element, with a yield of more than 98%. Preferably, under suitable growth conditions, the size of the crystal can exceed 6.05×3.58×1mm. 3 Y(CO)3OH crystal, and after comprehensive analysis, the crystal meets the three basic conditions for deep ultraviolet applications. Summary of the invention
[0005] The purpose of the present invention is to provide a yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal.
[0006] Another object of the present invention is to provide a method for preparing yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystals.
[0007] Another object of the present invention is to provide the use of yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal.
[0008] The invention provides a yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal, a preparation method and an application thereof. The yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal of the invention has a 157.89nm deep ultraviolet absorption cutoff edge.
[0009] The invention discloses a yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal, the chemical formula of which is Y(CO)3OH, which has no symmetry center, belongs to the orthorhombic system, has a space group of P212121 (19), and has a unit cell parameter of α=90°,β=90°,γ=90°,Z=4, the unit cell volume is
[0010] The hydrothermal method for growing yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystals is specifically performed in the following steps:
[0011] a. According to the chemical formula Y(NO3)3·6H2O:H3C3N3O3: molar ratio = 1:1, weigh the raw materials under air conditions, put them into a polytetrafluoroethylene liner, then add 3-20 ml of deionized water or purified water, cover the liner, put the liner into the 304 stainless steel shell of the hydrothermal kettle and tighten it.
[0012] b. Place the hydrothermal autoclave in step a into a step temperature-controlled blast drying oven, raise the temperature to 190-240°C at 0.5-1.5°C / min, keep warm for 24-96 hours, then cool down to 180-220°C and keep warm for 24-96 hours, then cool down to 160-200°C and keep warm for 24-96 hours, then cool down to 150-180°C and keep warm for 24-96 hours, and finally cool down to room temperature to obtain yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal.
[0013] The use of the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal is used for frequency conversion of laser output of a laser.
[0014] The use of the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal is to generate harmonic light outputs of 2-fold, 3-fold, 4-fold, 5-fold and 6-fold frequencies for a laser beam with a wavelength of 1064nm.
[0015] The use of the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal is to generate harmonic light output with a wavelength lower than 157.89nm.
[0016] The use of the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal is used to prepare harmonic generators, optical parametric oscillation and optical parametric amplifier devices and optical waveguide devices in the ultraviolet and deep ultraviolet regions.
[0017] The yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal, preparation method and use of the present invention can be obtained by a hydrothermal method with a size greater than 6.05×3.58×1 mm 3 Yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystals; by using a more precise growth temperature gradient, adopting a larger growth liner, and extending the growth time, yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystals of correspondingly larger sizes can be obtained.
[0018] The use of the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal is to prepare optical parametric oscillation and optical parametric amplifier devices from infrared to deep ultraviolet regions.
[0019] The application of the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal in the field of laser technology includes the preparation of ultraviolet and deep ultraviolet laser frequency conversion crystals, ultraviolet and deep ultraviolet lasers, ultraviolet and deep ultraviolet electro-optical devices, ultraviolet and deep ultraviolet communication devices, laser medical treatment, ultraviolet and deep ultraviolet lithography devices, and ultraviolet and deep ultraviolet micro-nano processing devices.
[0020] The yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal and optical device of the present invention have a wide band gap (7.86 eV), a frequency doubling effect comparable to that of KDP, good mechanical properties, are not prone to deliquesce, are easy to process and store, are easy to grow, have low cost, use environmentally friendly raw materials, and are convenient for industrial large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic diagram of the structure of the P212121 phase Y(CO)3OH crystal of the present invention, showing the projection of Y, C, O, and H along the a direction.
[0022] Figure 2 It is a schematic diagram of the structure of the P212121 phase Y(CO)3OH crystal of the present invention, showing the projection of Y, C, O, and HF along the b direction.
[0023] Figure 3 It is a schematic diagram of the structure of the P212121 phase Y(CO)3OH crystal of the present invention, showing the projection of Y, C, O, and H along the c direction.
[0024] Figure 4 This is a schematic diagram of the X-ray diffraction of the P212121 phase Y(CO)3OH single crystal after being ground into powder.
[0025] Figure 5 Schematic diagram of the energy band structure of the P212121 phase Y(CO)3OH theoretically calculated in the present invention.
[0026] Figure 6 Schematic diagram of the energy band structure of the R32 phase KBBF crystal theoretically calculated in the present invention.
[0027] Figure 7 It is a schematic diagram of the refractive index of the P212121 phase Y(CO)3OH crystal of the present invention.
[0028] Figure 8 Schematic diagram of powder frequency doubling of P212121 phase Y(CO)3OH crystal of the present invention.
[0029] Fig. 9 This is a working principle diagram of the P212121 phase Y(CO)3OH crystal of the present invention. DETAILED DESCRIPTION
[0030] The technical content, achieved objectives and effects of the present invention are described in detail below in conjunction with the implementation and drawings.
[0031] Examples 1-6 are about the Y(CO)3OH deep ultraviolet nonlinear optical crystal growth method.
[0032] Example 1
[0033] This embodiment adopts the hydrothermal method to prepare Y(CO)3OH single crystal, and the steps are as follows:
[0034] a. According to the chemical formula Y(NO3)3·6H2O:H3C3N3O3, the molar ratio is 1:1. Weigh the raw materials under air conditions and put them into a 25ml polytetrafluoroethylene liner. Add 20ml of deionized water into the liner. Then put the liner into a 304 stainless steel hydrothermal reactor and tighten the reactor.
[0035] b. Place the hydrothermal reactor in step a into a step temperature-controlled forced air drying oven, raise the temperature to 240°C at 0.5°C / min, keep it warm for 96 hours, then cool it to 220°C and keep it warm for 96 hours, then cool it to 200°C and keep it warm for 96 hours, then cool it to 180°C and keep it warm for 96 hours, and finally cool it naturally to room temperature.
[0036] c. Open the reactor at room temperature, take out the inner lining and pour the contents into a culture dish. After washing away impurities with clean water, put it into a drying oven for drying to obtain a large amount of colorless and transparent crystals, namely the Y(CO)3OH crystals.
[0037] Example 2
[0038] This embodiment adopts the hydrothermal method to prepare Y(CO)3OH single crystal, and the steps are as follows:
[0039] a According to the chemical formula Y(NO3)3·6H2O:H3C3N3O3 molar ratio = 1:1, weigh the raw materials in the fume hood and put them into a 25ml polytetrafluoroethylene liner. Add 3ml of deionized water into the liner. Then put the liner into a 304 stainless steel hydrothermal reactor and tighten the reactor.
[0040] b. Place the hydrothermal reactor in step a in a step temperature-controlled forced air drying oven, raise the temperature to 220°C at 1.5°C / min, keep it warm for 72 hours, then cool it to 200°C and keep it warm for 24 hours, then cool it to 160°C and keep it warm for 24 hours, and finally cool it naturally to room temperature.
[0041] c. Open the reactor at room temperature, take out the inner lining and pour the contents into a culture dish. After washing away impurities with clean water, put it into a drying oven for drying to obtain a large amount of colorless and transparent crystals, namely the Y(CO)3OH crystals.
[0042] Example 3
[0043] This embodiment adopts the hydrothermal method to prepare Y(CO)3OH single crystal, and the steps are as follows:
[0044] a According to the chemical formula Y(NO3)3·6H2O:H3C3N3O3, the molar ratio is 1:1. Weigh the raw materials under air conditions and put them into a 25ml polytetrafluoroethylene liner. Add 10ml of deionized water into the liner. Then put the liner into a 304 stainless steel hydrothermal reactor and tighten the reactor.
[0045] b. Place the hydrothermal reactor in step a in a step temperature-controlled forced air drying oven, raise the temperature to 190°C at 0.6°C / min, keep it at that temperature for 72h, and then cool it naturally to room temperature.
[0046] c. Open the reactor at room temperature, take out the inner lining and pour the contents into a culture dish. After washing away impurities with clean water, put it into a drying oven for drying to obtain a large amount of colorless and transparent block crystals, namely the Y(CO)3OH crystals.
[0047] Example 4
[0048] a. According to the chemical formula Y(NO3)3·6H2O:H3C3N3O3, the molar ratio is 1:1. The raw materials are weighed under air conditions and loaded into a 25 ml polytetrafluoroethylene liner. 15 ml of deionized water is added to the liner. Then the liner is placed in a 304 stainless steel hydrothermal reactor and the reactor is tightened.
[0049] b. Place the hydrothermal reactor in step a in a step temperature-controlled forced air drying oven, heat to 200°C at 0.8°C / min, keep warm for 72h, and then cool naturally to room temperature.
[0050] c. Open the reactor at room temperature, take out the inner lining and pour the contents into a culture dish. After washing away impurities with clean water, put it into a drying oven for drying to obtain a large amount of colorless and transparent crystals, namely the Y(CO)3OH crystals.
[0051] Example 5
[0052] a According to the chemical formula Y(NO3)3·6H2O:H3C3N3O3, the molar ratio is 1:1. Weigh the raw materials under air conditions and put them into a 25ml polytetrafluoroethylene liner. Add 10ml of deionized water into the liner. Then put the liner into a 304 stainless steel hydrothermal reactor and tighten the reactor.
[0053] b. Place the hydrothermal reactor in step a in a step temperature-controlled forced air drying oven, raise the temperature to 240°C at 1°C / min, keep it warm for 96 hours, then cool it down to 220°C and keep it warm for 24 hours, then cool it down to 200°C and keep it warm for 24 hours, then cool it down to 180°C and keep it warm for 24 hours, then cool it down to 160°C, and finally cool it naturally to room temperature.
[0054] c. Open the reactor at room temperature, take out the inner lining and pour the contents into a culture dish. After washing away impurities with clean water, put it into a drying oven for drying to obtain a large amount of colorless and transparent crystals, namely the Y(CO)3OH crystals.
[0055] Example 6
[0056] a. According to the chemical formula Y(NO3)3·6H2O:H3C3N3O3, the molar ratio is 1:1. Weigh the raw materials under air conditions, add 20 ml of deionized water into the polytetrafluoroethylene liner, then put the liner into the 304 stainless steel hydrothermal reactor and tighten the reactor.
[0057] b. Place the hydrothermal reactor in step a in a step temperature-controlled forced air drying oven, raise the temperature to 240°C at 1.2°C / min, keep warm for 96 hours, then cool down to 230°C and keep warm for 24 hours, then cool down to 220°C and keep warm for 24 hours, then cool down to 200°C and keep warm for 24 hours, then cool down to 190°C and keep warm for 12 hours, and finally cool naturally to room temperature.
[0058] c. Open the reactor at room temperature, take out the lining and pour the contents into a culture dish. After washing away impurities with clean water, put it into a drying oven for drying to obtain a large amount of colorless and transparent crystals, namely the Y(CO)3OH crystals.
[0059] Example 7
[0060] Any one of the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystals of implementation 1-6, the chemical formula of the crystal is Y(CO)3OH, the crystal has no symmetry center, belongs to the orthorhombic system, the space group is P212121(19), and the unit cell parameters are α=90°,β=90°,γ=90°,Z=4, the unit cell volume is The structure of the crystal is shown in Figure 1 , Figure 2 and Figure 3 , X-ray diffraction diagram is shown in Figure 4 .
[0061] Example 8
[0062] Accurate calculation of the energy band of Yttrium Hydroxycarbonate Deep Ultraviolet Nonlinear Optical Crystal:
[0063] The crystal structure data of any yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal obtained by implementing 1-6 are calculated using the Castep module of Material studio software in reciprocal space and modulus conservation pseudopotential conditions using the ultra-high precision PEB0 hybrid functional. The calculation results are shown in Figure 5 The theoretical band gap of Y(CO)3OH crystal is calculated to be 7.86eV (corresponding to the deep ultraviolet absorption edge of 157.89nm), which can be used to generate the shortest deep ultraviolet harmonic light output below 157.89nm; however, due to the discontinuity of the electronic wave function selected for theoretical calculation, the theoretical band gap is smaller than the actual band gap, and the corresponding cutoff edge is larger. The standard crystal structure data file of KBe2BO3F2 crystal with known R32 phase was derived from the ICSD standard database, and the crystal band gap was calculated by comparison using the same theoretical parameters. The calculation results are shown in Figure 6 The theoretical band gap value is 8.32eV (corresponding to the deep ultraviolet absorption edge of 149.12nm), while the actual band gap value is 8.44eV (corresponding to the deep ultraviolet absorption edge of 147.04nm), and the calculation error is only 1.4%, and the calculation result is relatively accurate. Therefore, the energy band theory calculation of the Y(CO)3OH crystal in the present invention is accurate.
[0064] Example 9
[0065] Accurate calculation of the refractive index of Yttrium Hydroxycarbonate deep ultraviolet nonlinear optical crystals:
[0066] The crystal structure data of any yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal obtained by implementing 1-6 are calculated using the Castep module of Material studio software in reciprocal space and modulus conservation pseudopotential conditions using the ultra-high precision PEB0 hybrid functional. The calculation results are shown in Figure 7, Y(CO)3OH crystal is a biaxial crystal with a birefringence index of Δn=n (100) -n (010) The birefringence in the wavelength range of 193 to 159 nm is 0.062 to 0.12, which can satisfy the birefringence phase matching, that is, the birefringence is in the range of [0.06, 0.12], which can achieve efficient laser output.
[0067] Example 10
[0068] Yttrium Hydroxycarbonate Deep Ultraviolet Nonlinear Optical Crystal Frequency Double Output:
[0069] Any of the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystals obtained in Implementation 1-6 was irradiated with a Q-switched Nd:YAG laser and an infrared laser with a fundamental wavelength of 1064nm to irradiate the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystals of different particle size ranges, and a KDP crystal with a corresponding particle size range was used for a comparative experiment. The particle size ranges used were 50-75, 75-100, 100-125, 125-150, and 150-180μm. The intensity results of the experimental output of 532nm doubled green laser are shown in Figure 8 The frequency doubling output efficiency of yttrium hydroxycarbonate is comparable to that of KDP crystal. Crystals used in deep ultraviolet should have a frequency doubling effect comparable to that of KDP. According to its band gap, the crystal can be used to achieve the laser output of 355nm, 266nm, 213nm, and 177nm of the 3rd frequency doubling of Nd:YAG laser.
[0070] Embodiment 11
[0071] Any one of the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystals obtained in Implementation 1-6 is used according to Fig. 9 As shown, it is placed at the position 5, and the fundamental frequency laser beam 2 with a frequency of w emitted by the laser 1 is focused by the convex lens 3 to produce the incident laser beam 4 which is shot into the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal 5, and the frequency-doubled laser beam with a frequency of 2w and the remaining fundamental frequency light 6 are output, and the frequency-doubled light and the fundamental frequency light are separated into output light 8 by the prism 7, thereby obtaining the required frequency-doubled laser.
[0072] Example 12
[0073] The yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal of the invention is used to prepare harmonic generators from infrared to deep ultraviolet regions, frequency doubling generators, optical parametric oscillators, optical parametric amplifiers, optical waveguides, and frequency up and down converters.
[0074] Example 12
[0075] The yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal of the present invention is used to generate harmonic light output with the shortest wavelength lower than 157.89nm.
[0076] In summary, the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal, preparation method and use of the present invention have the following advantages:
[0077] 1. Compared with other methods, the growth method of the present invention is simpler and more direct, with higher yield. Moreover, it is pollution-free and more environmentally friendly.
[0078] 1. Yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystals are colorless and transparent, not easy to deliquesce in the air, have good mechanical properties and are easy to process.
[0079] 2. Yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal can generate 2-fold, 3-fold, 4-fold, 5-fold and 6-fold harmonic light output for a laser beam with a wavelength of 1064nm.
[0080] 3. Yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal can generate harmonic light output with a wavelength below 157.89nm.
[0081] 4. Yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystals can be used in harmonic generators, frequency doubling generators, optical parametric oscillators, optical parametric amplifiers, optical waveguides, and frequency up and down converters from infrared to deep ultraviolet regions.
[0082] Finally, it should be noted that the above-described embodiments are only for illustrating the technical content, objectives and effects achieved by the present invention, and are not intended to limit the patent scope of the present invention. Any modification or equivalent transformation using the specification and drawings of the present invention, or direct or indirect application in related technical fields, does not depart from the spirit and scope of the technical solution of the present invention, and is equally included in the patent protection scope of the present invention.
Claims
1. A yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal, characterized in that: The chemical formula of the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal is Y(CO)3OH. The yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal has no symmetry center, belongs to the orthorhombic crystal system, has a space group of P212121 (19), and has a unit cell parameter of α=90°,β=90°,γ=90°,Z=4, the unit cell volume is 2. The method for preparing the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal according to claim 1, characterized in that: It is prepared by hydrothermal synthesis and hydrothermal self-crystallization; The hydrothermal synthesis method for growing yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystals is specifically performed in the following steps: a. According to the chemical formula Y(NO3)3·6H2O:H3C3N3O3: molar ratio = 1:1, weigh the raw materials under air conditions, put them into a polytetrafluoroethylene liner, then add 3-20 ml of deionized water or purified water, cover the liner, put the liner into the 304 stainless steel shell of the hydrothermal kettle and tighten it. b. Place the hydrothermal autoclave in step a into a step temperature-controlled blast drying oven, raise the temperature to 190-240°C at 0.5-1.5°C / min, keep warm for 24-96h, then cool down to 180-220°C and keep warm for 24-96h, then cool down to 160-200°C and keep warm for 24-96h, then cool down to 160-180°C and keep warm for 24-96h, finally cool naturally to room temperature to obtain yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal.
3. The method for preparing the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal according to claim 2, characterized in that The addition ratio of the Y(NO3)3·6H2O block solid and deionized water is 0.094-0.625 g / mL.
4. The method for preparing the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal according to claim 2, characterized in that: The Y(NO3)3·6H2O, cyanuric acid and deionized water are dissolved and crystallized in the inner lining of polytetrafluoroethylene material.
5. The use of the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal according to claim 1, characterized in that: The yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal is used for frequency conversion of laser output of a laser.
6. The use of the yttrium hydroxycarbonate deep ultraviolet optical crystal according to claim 1, characterized in that: The yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal is used to generate double-frequency, triple-frequency, quadruple-frequency, quintuple-frequency and sextuple-frequency harmonic light outputs for a laser beam with a wavelength of 1064nm.
7. The use of the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal according to claim 1, characterized in that: The yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal is used to generate harmonic light output with the shortest wavelength lower than 157.89nm.
8. The use of the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal according to claim 1, characterized in that: The yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal is used for preparing harmonic generators, optical parametric oscillators, optical parametric amplifiers and optical waveguide components in the ultraviolet and deep ultraviolet regions.
9. The use of the yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal and device as claimed in claim 8, characterized in that: The yttrium hydroxycarbonate deep ultraviolet nonlinear optical crystal and device are used for preparing all-solid-state lasers from infrared to deep ultraviolet regions, laser medical treatment, or short-wave laser micro-nano lithography.