34 results about "Linear optics" patented technology

This application discloses a method and device for fabricating a periodically polarized ultrathin lithium niobate / lithium tantalate device, belonging to the field of nonlinear optical device manufacturing. The method includes: fabricating and polarizing periodic electrodes on a provided ferroelectric crystal wafer to form a periodically polarized master wafer; bonding the master wafer to a carrier substrate using optical resin-assisted bonding or direct bonding to form a composite structure; thinning and polishing the side of the master wafer away from the carrier substrate to obtain an ultrathin periodically polarized crystal functional layer; and fabricating the structure of the ultrathin periodically polarized crystal functional layer to obtain a periodically polarized ultrathin lithium niobate / lithium tantalate device. This method avoids the inherent problems of high-voltage breakdown and poor domain quality in existing technologies when directly polarizing ultrathin crystals by placing the high-risk polarization step on a thick, stable wafer.

A laser assembly and a method for generating continuous-wave (CW) light at approximately 193 nm (between 180 nm and 200 nm) and at a power of 1W or higher using two CW laser sources: one laser source generating first fundamental light that is twice frequency doubled or otherwise converted into first CW light having a first deep-ultraviolet (DUV) wavelength between 250 nm and 275 nm, the other laser source generating second CW light having an infrared (IR) wavelength between 1300 nm and 1700 nm. A resonant cavity receives the second CW light and generates enhanced CW light at 100 W or higher. A first non-linear optical (NLO) crystal mixes a first enhanced CW light portion and the first CW light to generate sum-frequency generation (SFG) light having a second DUV wavelength. A second NLO crystal mixes a second enhanced CW light portion and the SFG light to generate output CW light at approximately 193 nm.

The application discloses application of a lanthanide metal crystal in preparation of a nonlinear optical device or a birefringent optical device. The lanthanide metal crystal is selected from La4O4Se3, Ce4O4Se3, Pr4O4Se3, Nd4O4Se3 or Sm4O4Se3. In the application, a specific lanthanide metal crystal is used in preparation of a nonlinear optical device, and a nonlinear optical device with sufficient nonlinear optical effect and a long infrared cutoff edge capable of covering an atmospheric transparent window of 8-14 microns is obtained.

The application discloses a nonlinear optical device based on ammonium fluoroborate crystal and a manufacturing method and application thereof, and the manufacturing method comprises the following steps: a, measuring the frequency doubling coefficient of the ammonium fluoroborate crystal; b, determining the effective frequency doubling coefficient formula of the ammonium fluoroborate crystal cut according to the phase matching angle; c, measuring the principal refractive index of the ammonium fluoroborate crystal at multiple wavelengths from deep ultraviolet to infrared, and fitting to obtain a Sellmeier equation; d, obtaining the type I or type II phase matching curve of the ammonium fluoroborate crystal by using the Sellmeier equation in step c, and determining the phase matching point of the ammonium fluoroborate crystal; and e, performing orientation, cutting, polishing of two light transmission surfaces and medium film plating on the ammonium fluoroborate crystal according to the phase matching direction to obtain a prism-free nonlinear optical device of the ammonium fluoroborate crystal. The nonlinear optical device can be obtained without the aid of a prism, and has a relatively high output power.

This invention relates to a nonlinear optical crystal of potassium triacetate dihydrate, its preparation method, and its uses. The molecular formula of the crystal is K3C6O8H. 10 It has a molecular weight of 331.62, belongs to the orthorhombic crystal system, and has a space group of [missing information]. P 212121, cell parameters are a =8.7596(5)Å, b =10.0487(6)Å, c =13.9979(6)Å, α =90.00° β =90.00° gamma =90.00° Z =4, V =1232.13(11)Å 3 Centimeter-sized crystals were grown using an evaporation method and an aqueous solution cooling method. Under 1064nm laser irradiation, the powder frequency doubling effect of this crystal was equivalent to that of KH₂PO₄. 4 (KDP). This crystal has an ultraviolet absorption edge shorter than 200 nm and an experimental birefringence of approximately 0.06 at 546 nm. It is simple to prepare, low in cost, exhibits significant nonlinear optical effects, a large birefringence, a wide transmission range, and is easy to grow and process. It can be used as an ultraviolet nonlinear optical crystal and a birefringent crystal.

This invention discloses potassium borosilicate, potassium borosilicate nonlinear optical crystals, their preparation methods, and applications, belonging to the field of nonlinear optical crystal technology. The chemical formula of potassium borosilicate is K4B6Si3O. 17 With a molecular weight of 577.53, it was prepared using solid-state synthesis or vacuum encapsulation; the chemical formula of this crystal is K4B6Si3O. 17 It has a molecular weight of 577.53, belongs to the monoclinic crystal system, and has a space group of C 2. The unit cell parameters are a =11.8628(13)Å, b =6.6285(6)Å, c =11.0097(19)Å, β =117.183(4)°, unit cell volume is 770.10(17) Å. 3 The powder frequency doubling effect of the crystal is about 1.4 times that of KH2PO4 (KDP), and the ultraviolet absorption edge is shorter than 190 nm. The crystal has good chemical stability and can be used as an ultraviolet and deep ultraviolet nonlinear optical crystal in all-solid-state lasers.

This invention relates to a series of alkali metal rare earth chalcogenides and a series of alkali metal rare earth chalcogenide nonlinear optical crystals, their preparation methods, and their applications. The general chemical formula for both the series of halides and the nonlinear optical crystals is A3Ln. 11 Ga 19 Q 45 X3, where A = K, Rb, Cs; Ln = La, Pr, Nd; Q = S, Se; X = Cl, Br, I, all belong to the hexagonal crystal system with space group and cell parameter Z = 1. This series of halides is synthesized using a high-temperature solid-state method, while this series of nonlinear optical crystals is grown using a high-temperature solution method or the Bridgman process. This material can be used to manufacture second harmonic generators, up- and down-frequency converters, optical parametric oscillators, etc.

A method includes causing activation, at a first time, of a first set of squeezed light sources from a plurality of squeezed light sources of a Gaussian boson sampling (GBS) circuit. At a second time after the first time, a first photon statistic is detected at a first output port from a plurality of output ports of the GBS circuit. At a third time after the first time, a second set of squeezed light sources from the plurality of squeezed light sources of the GBS circuit is activated, the second set of squeezed light sources being different from the first set of squeezed light sources. At a fourth time after the third time, a second photon statistic is detected at a second output port from the plurality of output ports of the GBS circuit. At least one transformation matrix is estimated that represents a linear optical interferometer of the GBS circuit based on the first photon statistic and the second photon statistic.

The application discloses application of In2Te5 crystal in preparation of a nonlinear optical device in an infrared wave band. The In2Te5 crystal belongs to a monoclinic system, a Cc space group, has a cell parameter of alpha = gamma = 90 DEG, beta = 91.65 DEG, z = 4, and a unit cell volume of 0.56. The In2Te5 crystal can be used as a nonlinear optical material in preparation of a nonlinear optical device, and its frequency doubling coefficient is about 2-3 times of that of a ZnGeP2 crystal and 15 times of that of an AgGaS2 crystal. The infrared transmission range of the In2Te5 crystal can reach 30 microns. The optical birefringence of the In2Te5 crystal can reach 0.56, so the In2Te5 crystal can be used as a good mid-infrared nonlinear optical material, a mid-infrared photoconductive material and a mid-infrared birefringent material, and can be widely applied in various nonlinear optical fields, especially in the nonlinear optical application in the mid-infrared wave band.

A light management system includes a visible light source and a planar layered light confining structure having front and back sheets with a light converting layer between them. A microstructured front layer on the front sheet includes linear optical structures extending between opposite edges. The back sheet has an opaque reflective surface, and the structure includes a surface for total internal reflection. Light input ports having a cumulative area of no more than 10% of the converting layer area are arranged in a two-dimensional array and used to inject light into the structure. The light converting layer has an active layer containing light converting materials with different bandgaps that absorb light in a selected spectral band and transmit light in a different spectral band. The active layer includes quantum dots and has a thickness less than needed for complete single-pass absorption to accommodate multiple transverse light propagation.

The present invention relates to a preparation method for a trigonal nonlinear optical crystal frequency converter and an operating method. The frequency converter has a first group of parallel surfaces and a second group of parallel surfaces, wherein the first group of parallel surfaces is parallel to a c-axis and an a-axis of an optical crystal, an angle α is formed between a normal of the second group of parallel surfaces and the c-axis, and an included angle β is formed between the projection of the normal on an a-b plane and the a-axis; and θPM having a relation shown in Formula (1) and Formula (2) is a phase matching angle of the nonlinear optical crystal satisfying an incident fundamental frequency light and an emergent variable frequency light, where θB=arctann, which is a Brewster angle, n is the refractive index of the nonlinear optical crystal corresponding to the incident fundamental frequency light, and the second group of parallel surfaces includes a light transmission input surface and a light transmission output surface of the frequency converter. The present invention provides, on the basis of a thin sheet-like primary crystal, a preparation method for a nonlinear optical crystal frequency converter having a length in a light transmission direction as large as possible and suitable for continuous wave application and an operating method.

This invention discloses a laser frequency conversion system and method based on thermal lensing effect enhancement, belonging to the field of laser technology. The system includes a first pump source, a nonlinear frequency conversion crystal, and a second pump source. The crystal is a rare-earth-doped calcium borate crystal, which absorbs the first pump light to generate a controllable thermal lensing effect. The fundamental wave light emitted from the second pump source is coaxially incident on the crystal with the first pump light. The thermal lens focuses the fundamental wave light, significantly increasing its power density within the crystal. The crystal then utilizes a nonlinear optical effect to efficiently convert the high-power-density fundamental wave light into harmonic light output. This invention solves the problem of low efficiency in traditional extracavity frequency doubling. Through an active focusing mechanism, high-efficiency and high-stability visible light laser output can be achieved with only a lower fundamental wave power, making it particularly suitable for biological detection and medical aesthetics.

This invention relates to a compound strontium borate nitrate and a strontium borate nitrate nonlinear optical crystal, as well as their preparation methods and uses. The chemical formula of the compound is Sr3B9O. 16 (NO3), with a molecular weight of 678.16, was prepared using a vacuum-sealed tube method; the chemical formula of this crystal is Sr3B9O. 16 (NO3), with a molecular weight of 678.16, belongs to the monoclinic crystal system and has a space group of Cc The unit cell parameters are a =11.2574(9)Å, b =6.6400(9)Å, c =18.1027(13)Å, Z=4, V=1348.9(2)Å 3 It is prepared using a high-temperature melt method or hydrothermal method under vacuum sealing conditions. Its nonlinear optical effect is approximately three times that of KDP, and its birefringence is 0.088@546 nm. This method has advantages such as simple preparation, short growth cycle, low toxicity of starting materials, and minimal harm to humans. Sr3B9O obtained by the method described in this invention... 16 (NO3) Nonlinear optical crystals have stable physicochemical properties, large nonlinear effects, and can be applied to phase-matching wavelengths in the ultraviolet band. They can be widely used in nonlinear optical devices such as frequency doubling converters and optical parametric oscillators.

This application discloses a fluorinated zirconium phosphate compound, its nonlinear optical crystal, its preparation method, and its applications. The chemical formula of the fluorinated zirconium phosphate compound is Zr(H2PO4)(HPO4)F·nH2O, where 0≤n≤3, and n is an integer. Its nonlinear optical crystal consists of a two-dimensional infinite layered structure formed by [ZrO5F] coordination polyhedra and [HPO4] and [H2PO4] tetrahedra connected by shared oxygen atoms, with interlayer crystal water molecules forming a hydrogen bond network. The nonlinear optical crystal is a non-centrosymmetric crystal; it belongs to the monoclinic crystal system; and its space group is [missing information - likely a specific space group or group]. I 2; The unit cell parameters of a nonlinear optical crystal are a =10.1200(5)Å, b =6.5653(3)Å, c =15.6899(8), β =92.340(5), unit cell volume V =1041.58(9)Å 3 This nonlinear optical crystal possesses deep ultraviolet transparency, a considerable frequency doubling response, and high birefringence, thus meeting the application requirements of nonlinear optical devices. Furthermore, the preparation method has the advantages of simple operation, low cost, low pollution, and low toxicity of the raw materials used.

The application relates to a method for enhancing the nonlinear optical performance of SnS2 nanosheets through electrostatic doping. First, SnS2 nanosheets are prepared on a fluorine-doped tin oxide (FTO) substrate by a chemical vapor deposition method, and then hydrogen ion intercalated SnS2-H + The electrostatic doping causes the band gap to shrink and a strong built-in electric field to be generated, so that the nonlinear optical performance of the material is enhanced. In addition, the saturated absorption response of the material enables the application to an optical neural network as a nonlinear activation function, and exhibits application potential in machine learning tasks. The SnS2-H + The application establishes a promising and convenient nonlinear optical material, and provides new insights for the design exploration and simple synthesis of high-performance nonlinear absorption materials.

This invention relates to a series of malonate borate nonlinear optical crystals, their preparation methods, and applications. The general molecular formula of this series of compounds is AM[C3H2O4]B(OH)3(H2O). x Where A = K, Rb, Cs; M = K, Rb, Cs, x = 0, 1, molecular weight is 242.08–436.72, prepared by room temperature solution method, orthorhombic crystal system, space group P 212121 (No. 19), with cell parameters a = 6.6168(11) - 7.256(3) Å, b = 9.574(5) - 10.271(3) Å, c = 13.0172(12) - 13.984(5) Å. α =90, β =90, gamma =90, Z =4, V=851.3(4)-1042.2(7)Å 3 The series of malonate borate nonlinear optical crystals obtained by this method have advantages such as a wide transmission band, stable physicochemical properties, moderate mechanical hardness, resistance to breakage, and ease of cutting, polishing, and storage. They can withstand 1064nm infrared light incident on AM[C3H2O4]B(OH)3(H2O). x The crystal can produce green frequency-doubled light with a wavelength of 532nm, and the output intensity is about 0.5-1.2 times that of KDP under the same conditions.

This invention discloses a method and system for measuring electric field strength, applied in the field of electric field strength measurement technology. The method includes: acquiring gas environment parameters of the electrical equipment under test; obtaining optical parameter variation information of each incident laser in the electrical equipment under test during simulation testing using selected incident lasers; determining a first parameter correction amount based on the response curve, refractive index correction factor, and gas density distribution field; determining a second parameter correction amount for each linear optical parameter based on the gas environment parameters; optimizing the electric field strength measurement model of the electrical equipment under test based on the first parameter correction amount and each of the second parameter correction amounts to obtain an optimized electric field strength measurement model; and obtaining the electric field strength result. The electric field strength measurement method and system provided by this invention effectively improve the accuracy and reliability of parameter optimization in the electric field strength measurement process, thereby enabling the acquisition of accurate electric field strength.

A light management system includes a visible light source and a planar layered light confining structure having front and back sheets with a light converting layer between them. A microstructured front layer on the front sheet includes linear optical structures extending between opposite edges. The back sheet has an opaque reflective surface, and the structure includes a surface for total internal reflection. Light input ports having a cumulative area of no more than 10% of the converting layer area are arranged in a two-dimensional array and used to inject light into the structure. The light converting layer has an active layer containing light converting materials with different bandgaps that absorb light in a selected spectral band and transmit light in a different spectral band. The active layer includes quantum dots and has a thickness less than needed for complete single-pass absorption to accommodate multiple transverse light propagation.

The application discloses a nonlinear optical superstructure surface and a design and preparation method and an image encryption system thereof. The nonlinear optical superstructure surface comprises a C3 metal layer, a dielectric layer and an ENZ layer; the dielectric layer comprises a dielectric film with multiple step thicknesses; the C3 metal layer comprises a plurality of metal plasmonic superstructure units with three-fold rotational symmetry; the dielectric layer is located on the surface of the ENZ layer, and the C3 metal layer is located on the surface of the dielectric layer. The intensity of nonlinear emergent light is regulated through the dielectric film with multiple step thicknesses, so that an encrypted gray-scale image is read based on the nonlinear emergent light field distribution, and the image encryption application is realized. Moreover, the nonlinear optical superstructure surface provided by the application presents a uniform light field distribution under linear optical measurement, does not leak the encrypted information, and improves the confidentiality and decryption difficulty of the nonlinear optical superstructure surface image encryption.

This invention relates to a nonlinear optical crystal of guanidinoacetic acid chloride, its preparation method, and its uses. The crystal has the molecular formula C3N3O2H8Cl, a molecular weight of 153.57, belongs to the tetragonal crystal system, and has a space group of [missing information]. I 2 d The unit cell parameters are a =15.7150(13)Å, b =15.7150(13)Å, c =11.0742(15)Å, α =90.00° β =90.00° gamma =90.00° Z =16, V =2734.9(6)Å 3 Centimeter-sized crystals were grown using evaporation, aqueous solution cooling, or hydrothermal methods. Under 1064 nm laser irradiation, the crystal exhibited a frequency doubling response similar to that of potassium dihydrogen phosphate. The ultraviolet absorption edge of the crystal was approximately 250 nm, and the experimental birefringence was approximately 0.08 at 546 nm. This crystal preparation method is simple and low-cost, possesses significant nonlinear optical effects, a large birefringence, a wide transmission range, and is easy to grow and process. It can be used as an ultraviolet nonlinear optical crystal and a birefringent crystal.

This invention relates to a compound, alkali metal antimony fluoride phosphate, and an alkali metal antimony fluoride phosphate ultraviolet birefringent crystal, as well as their preparation methods and uses. The compound has the chemical formula Na₄Sb₃F₇(PO₄)₂ and a molecular weight of 780.15 g / mol. The crystal has the chemical formula Na₄Sb₃F₇(PO₄)₂ and is monoclinic. P twenty one / m Space group, cell parameters are a =5.3557(2)Å, b =15.1697(6)Å, c =8.1164(3)Å, α = gamma =90°, β =97.6170(10)°, Z =2, V =653.59(4)Å 3 The crystal is grown using a hydrothermal method or a high-temperature melt method. The crystal obtained by this invention has a cutoff edge of 226 nm and a birefringence of 0.120@546 nm. It has advantages such as ease of growth, easy cutting, easy grinding, easy polishing, easy storage, stability in air, and resistance to deliquescence. It is widely used in linear optical devices such as Glan prisms, Wollaston prisms, Lochte prisms, or beam splitting polarizers.

This invention relates to imidazole trifluoroacetamidine nonlinear optical crystals, their preparation methods, and applications. The crystal has the molecular formula C(NH₂)₂CF₃(C₃N₂H₃), a molecular weight of 180.15, belongs to the orthorhombic crystal system, and has a space group of [missing information]. I 212121, cell parameters are a =8.781(1)Å, b =9.0684(9)Å, c =9.1540(8)Å, α =90.00° β =90.00° gamma =90.00° Z =4, V =728.93(13)Å 3 A millimeter-sized crystal was grown using an evaporation method and an aqueous solution cooling method. The crystal's ultraviolet absorption edge is shorter than 210 nm, and its experimental birefringence is approximately 0.12 at 546 nm. The preparation method is simple and low-cost, exhibiting significant nonlinear optical effects, a large birefringence, a wide transmission range, and ease of growth and processing. It can be used as an ultraviolet nonlinear optical crystal and a birefringent crystal.

The application discloses a fluorine-containing zirconium phosphate compound, a nonlinear optical crystal thereof and a preparation method and application thereof, and belongs to the technical field of inorganic functional crystal materials. The chemical formula of the fluorine-containing zirconium phosphate compound is ZrPO4F. The nonlinear optical crystal is composed of a [PO4] tetrahedron and a fluorine-containing zirconium coordination polyhedron to form a three-dimensional skeleton structure, zirconium is six-coordinated and forms a zirconium oxygen coordination polyhedron containing F; the nonlinear optical crystal is a non-centrosymmetric crystal; the nonlinear optical crystal is of an orthorhombic system; the space group of the nonlinear optical crystal is Pna 21; the cell parameters of the nonlinear optical crystal are a = 11.6094 (5) Å, b = 6.9038 (3) Å, c = 5.4921 (2) Å, α = β = γ = 90°, Z = 4, and the unit cell volume is V = 440.19 (3) Å 3 . The nonlinear optical crystal has a nonlinear optical effect, a large band gap (deep ultraviolet transparency), a wide transmission range and easy preservation, and is a nonlinear optical crystal material with great potential application value.

This invention relates to the compounds strontium lanthanum chloroborate and barium lanthanum chloroborate, as well as nonlinear optical crystals of strontium lanthanum chloroborate and barium lanthanum chloroborate, their preparation methods, and their uses. The general chemical formula for both the compounds and crystals is A3La4B3O. 13 Cl, where A = Sr, Ba, space group P63, belongs to the hexagonal crystal system, and cell parameter Z = 2. The compounds lanthanum strontium chloroborate and lanthanum barium chloroborate are synthesized by a solid-state reaction method. The nonlinear optical crystals of lanthanum strontium chloroborate and lanthanum barium chloroborate are grown using a high-temperature melt method. This material can be used to manufacture second harmonic generators, up-down frequency converters, optical parametric oscillators, etc.

This application discloses a fluorinated zirconium phosphate compound, its nonlinear optical crystal, its preparation method, and its applications. The chemical formula of the fluorinated zirconium phosphate compound is Rb. x (NH4) y Zr4(H2PO4)F 21 Where 0≤x≤6, 0≤y≤6, and x+y=6. The nonlinear optical crystal is a one-dimensional chain structure formed by connecting [H2PO4] tetrahedra with [ZrF7] / [ZrOF7] fluorine-containing zirconium coordination polyhedra; the nonlinear optical crystal is a non-centrosymmetric crystal; the nonlinear optical crystal is an orthorhombic crystal system; the space group of the nonlinear optical crystal is... Pna 21; The unit cell parameters of a nonlinear optical crystal are a =13.6933(3)Å, b =15.2014(4)Å, c =11.4304(2)Å, α = β = γ =90°, unit cell volume V =2379.32(9)Å 3 This nonlinear optical crystal possesses both deep ultraviolet transparency and a strong second harmonic response. The fabrication method utilizes a hydrothermal reaction, which is simple and operates under mild conditions. The resulting nonlinear optical crystal can be used to construct nonlinear optical devices such as frequency multipliers, sum / difference frequency converters, and optical parametric oscillators.

The object of this invention is to provide a copolymer with nonlinear optically active sites capable of forming a crack-free film, a nonlinear optical material comprising the copolymer, and an electro-optical element. The copolymer of this invention is characterized by comprising repeating structural units (A) having adamantyl alkyl groups and repeating structural units (B) having nonlinear optically active sites, as represented by formula (1). (Where R...) 1 W represents a hydrogen atom or a methyl group. 1 Indicates -O-, -S-, or -NH-, L 1 This indicates a divalent hydrocarbon group with 1 to 30 carbon atoms that may contain single bonds, ether bonds, and / or ester bonds, or *-L. 2 -NHC(=O)O- (* indicates W) 1 (bonding end), L 2 Ad represents a divalent hydrocarbon group with 1 to 30 carbon atoms that may contain ether bonds and / or ester bonds; Ad represents an adamantyl group that may be substituted by an alkyl group with 1 to 5 carbon atoms; R represents a divalent hydrocarbon group that may contain ether bonds and / or ester bonds. 2 The alkoxy group represents 1 to 10 carbon atoms bonded to any carbon atom constituting the adamantyl alkyl group, where n represents an integer from 1 to 15. (1)

A nonlinear optical microdevice array that enables low energy and massively parallel nonlinear optical control with incoherent light. Optical computing has been a goal long sought after, because it allows for massively parallel information processing. The major roadblock has been the difficulty to achieve efficient optical nonlinearity that is required in controlling one light by another light beam. A semiconductor pn junction and electro-optical modulator (e.g., liquid crystal or micromirror array) are integrated at a single pixel scale, to achieve artificial optical nonlinearity that is highly parallel (with millions of pixels), extremely energy efficient (at sub picojoule level), and compatible with incoherent LED light sources.

The application discloses a noise suppression device of a multi-wavelength direct modulation laser, which comprises a direct modulation laser array, an optical splitter, a four-port fiber circulator, a low-loss nonlinear optical resonant cavity and a modulation module, the output of the direct modulation laser array is connected with the second port of the four-port fiber circulator, the third port of the four-port fiber circulator is connected with the low-loss nonlinear optical resonant cavity, the fourth port of the four-port fiber circulator is connected with the first port, and an injection locking closed loop is formed; the modulation module is electrically connected with the direct modulation laser array, the modulation frequency of the corresponding direct modulation laser is independently adjusted, and each wavelength laser can meet the resonance condition and the injection locking condition in the low-loss nonlinear optical resonant cavity, that is, the characteristic frequency shift is equal to the modulation frequency or an integer multiple of the modulation frequency. The application utilizes the super-narrow linewidth characteristic of nonlinear stimulated scattering and combines the injection locking technology, so that the linewidth of the direct modulation laser can be compressed to the Hz order, that is, the frequency noise is well suppressed. In addition, the application has the characteristics of multi-wavelength flexible adaptation, high cavity power utilization rate, simple structure and high integration degree.

A laser assembly and a method for generating continuous-wave (CW) light at approximately 193 nm (between 180 nm and 200 nm) and at a power of 1 W or higher using two CW laser sources: one laser source generating first fundamental light that is twice frequency doubled or otherwise converted into first CW light having a first deep-ultraviolet (DUV) wavelength between 250 nm and 275 nm, the other laser source generating second CW light having an infrared (IR) wavelength between 1300 nm and 1700 nm. A resonant cavity receives the second CW light and generates enhanced CW light at 100 W or higher. A first non-linear optical (NLO) crystal mixes a first enhanced CW light portion and the first CW light to generate sum-frequency generation (SFG) light having a second DUV wavelength. A second NLO crystal mixes a second enhanced CW light portion and the SFG light to generate output CW light at approximately 193 nm.

This invention relates to a method for generating terahertz radiation and a terahertz radiation source. In the method according to the invention, a pump beam (14) emitted from a pump beam source is incident on a block of a semiconductor nonlinear optical medium (10) having a planar parallel front boundary surface and a rear boundary surface (11, 12), wherein the pump beam (14) is decomposed into a set of sub-pump beams upon refraction on a periodic structure (13) formed by pairs of planar surfaces in the front boundary surface of the block. The sub-pump beams travel in angular directions required to satisfy velocity matching conditions. The envelope of the pump pulse leading edge segment propagating in the sub-pump beam segment propagates in a direction perpendicular to the rear boundary surface (12) (i.e., the exit surface of the optical medium (10)) at the propagation speed of terahertz radiation, and generates terahertz radiation in the semiconductor optical medium (10) by means of optical rectification to satisfy the velocity matching condition; here, is the group velocity of the pump beam (14), is the phase velocity of the generated terahertz radiation, and y is the angle between the envelope of the pulse leading edge of the pump beam (14) and the phase leading edge.