173 results about "Optical parametric oscillator" patented technology

The invention discloses a series of alkali metal borate compounds and alkali metal borate crystals as well as a preparation method and application thereof, and belongs to the technical field of photoelectric functional crystal materials. The chemical general formula of the series of compounds and crystals thereof is A3RE (B3O6) 2, wherein A is K, Rb, Cs or NH4; rE = Sc and Y, the molecular weight is 355.93-744.48, the series of crystals belong to a trigonal system, the space group is P321, the cell parameters a = b = 10.5237 (13)-135237 (13), and # imgabs0 # Z = 3. The series of alkali metal borate compounds are synthesized by adopting a solid-phase reaction method or a hydrothermal method, and the series of crystals grow by adopting a high-temperature melt method or a hydrothermal method or a solution method. The series of materials can be used for manufacturing second harmonic generators, upper and lower frequency converters, optical parametric oscillators, polarizing prisms and the like.

The invention provides a dual-wavelength tunable all-solid-state mid-far infrared laser, relates to the technical field of lasers, and is used for solving the technical problems that high-performance dual-wavelength 3 [mu] m waveband laser and mid-far infrared waveband laser generated by pumping of the high-performance dual-wavelength 3 [mu] m waveband laser are difficult to obtain in the prior art. The middle and far infrared laser comprises an erbium-doped laser and an optical parametric oscillator, the erbium-doped laser is used for providing dual-wavelength 3-micron wave band pulse laser, and the erbium-doped laser comprises a pumping source, an erbium-doped laser medium, a gain modulator, a high reflective mirror and an output mirror; the optical parametric oscillator is used for obtaining medium-wave infrared laser and long-wave infrared laser which are output in a dual-wavelength mode under the pumping effect of the dual-wavelength pulse laser in the 3-micron wave band. The mid-far infrared laser is simple in structure and convenient to use, can obtain tunable dual-wavelength mid-far infrared pulse laser with high beam quality, and meets the light source requirements of differential absorption of toxic gas telemetering of laser radar and photoelectric countermeasure.

The invention belongs to the technical field of spectrum detection, and relates to a polarization LIBS-LIF system for trace element detection, the system comprises a laser emission unit, a first light path structure, an optical parametric oscillator, a second light path structure, a displacement platform, a polarization acquisition module and an analysis control module; the laser emitting unit is used for emitting a first laser beam to the first light path structure; the first light path structure is used for converting the received first laser beam into circularly polarized light and emitting the circularly polarized light into a sample on the displacement platform; the optical parametric oscillator is used for emitting a second laser beam into the second light path structure; the second light path structure is used for focusing the second laser beam and then emitting the second laser beam into the same position of the circularly polarized light to the sample so as to excite the to-be-detected element in the plasma; the polarization acquisition module is used for acquiring plasma spectral signals, converting the plasma spectral signals into electric signals and transmitting the electric signals to the analysis control module. The plasma excitation efficiency can be improved, the detection limit can be reduced, and the stability of the detection result can be improved.

An optical parametric oscillator and method for generating coherent signal light involve a resonant optical cavity for coherent signal light, and in the cavity a non-parametric gain element for amplifying the coherent signal light to only partially compensate for passive optical roundtrip losses, thereby obtaining lower effective roundtrip losses. A parametric gain element is arranged in the cavity, for converting coherent pump light into coherent signal light through an instantaneous nonlinear optical interaction. The parametric oscillator has means for adjusting an intracavity optical power of the coherent pump light above a threshold value, where the parametric gain is balancing the effective roundtrip losses, thus inducing sustained oscillations of the signal light in the optical cavity. The non-parametric gain element is configured to have a limited non-parametric gain over a gain bandwidth of the parametric gain element, which is less than the passive optical roundtrip losses in the gain bandwidth.

The invention discloses a device for realizing low-loss work of a long-wave infrared femtosecond optical parametric oscillator, which belongs to the field of optical parametric oscillators and comprises a pumping source, a pumping focusing lens, a long-wave infrared nonlinear crystal cut at a Brewster angle, a laser medium dichroscope and an output coupling mirror. Wherein the nonlinear crystal meets the I-type phase matching condition for the optical parameter process, and the front and rear surfaces of the crystal cut the central wavelength of the oscillated signal pulse at a Brewster angle so as to reduce the loss of the pulse in the resonant cavity. According to the long-wave infrared femtosecond optical parametric oscillator, the limitation of residual loss of a crystal antireflection film is broken through by adopting Brewster angle cutting on the crystal, so that the construction of the femtosecond optical parametric oscillator based on the long-wave infrared nonlinear crystal becomes possible, and the bottleneck of the existing long-wave infrared femtosecond optical parametric oscillator in the aspects of wavelength tuning range, output power and the like is expected to be broken through; and a practical low-cost technical scheme is provided for construction and application of the long-wave infrared femtosecond optical parametric oscillator.

The invention belongs to the field of optical parametric oscillators, and particularly discloses a cavity length control device and method for a femtosecond pulse synchronous pump optical parametric oscillator, and a temperature control element is arranged on a metal bottom plate and used for adjusting the temperature of the metal bottom plate; and the temperature controller is electrically connected with the temperature control element and is used for adjusting the temperature of the temperature control element according to the characteristic parameters of the light output by the optical parametric oscillator so as to adjust the temperature of the metal bottom plate to adjust the cavity length of the optical parametric oscillator. The temperature of the temperature control element is accurately adjusted through the temperature controller, fine control over the temperature of the metal bottom plate is achieved, then fine control over the length of the metal bottom plate is achieved, small changes of the length of the metal bottom plate can be directly reflected to changes of the cavity length, and therefore high-precision adjustment of the cavity length is achieved; and compared with expensive devices such as piezoelectric ceramics and precise stepping motors, the manufacturing cost and the maintenance difficulty are reduced, and meanwhile, the overall performance and stability of the system are improved.

The invention discloses an ultra-wideband femtosecond optical parametric oscillator capable of being quickly tuned, and relates to the technical field of optical parametric oscillators. The oscillator comprises a frequency doubling device, an optical parametric oscillator resonant cavity device and a dispersion compensation chirp mirror pair module. According to the invention, the original phase matching bandwidth is further broken through by adopting a non-collinear phase matching mode that the transmission included angle between the pump light and the signal light is 2.5 degrees, and rapid wavelength tuning can be realized only by finely tuning the cavity length under the condition that the angle of the nonlinear crystal is not adjusted; the broadband tunable optical parametric oscillator can break through the bottlenecks in the aspects of wavelength tuning range, wavelength tuning speed and the like of the existing near-infrared optical parametric oscillator, and provides a novel light source with larger wavelength tuning range and higher tuning speed for the fields needing broadband tunable light sources, such as spectroscopy, micro-nano processing, optical frequency combs and the like.

The invention relates to an aminoguanidine oxalate second-order nonlinear optical crystal material and preparation and application thereof, the chemical formula of the crystal material is (CN4H7) + (C2O4H)-, the crystal material belongs to a monoclinic system, the space group is P21, the cell parameters are # imgabs0 # and # imgabs1 #, alpha is equal to 90 degrees, beta is equal to 95-100 degrees, gamma is equal to 90 degrees, and Z is equal to 2. The powder frequency-doubled effect of the nonlinear optical crystal (CN4H7) + (C2O4H)-disclosed by the invention under the irradiation of 1064nm laser is about 1.0 time of that of a KH2PO4 (KDP) crystal, and phase matching can be realized. In addition, the crystal material has the advantages of being short in ultraviolet absorption cut-off edge (290 nm), easy to grow and the like, and has important application value in the photoelectric conversion fields of stereolithography, solid-state lasers, optical communication, optical parametric amplifiers, optical parametric oscillators, laser frequency converters and the like.

The invention provides a bright low-frequency compressed light generation device and method, and belongs to the technical field of non-classical light field generation. The problems that an existing bright compressed light generating device still has technical defects in the aspects of optical power, compression degree, stability, preparation device complexity and the like are solved. According to the technical scheme, laser generated by a single-frequency laser is divided into two beams after passing through a laser preparation module, one beam enters a frequency doubling cavity to generate frequency doubling light, fundamental frequency light reflected by the frequency doubling light is subjected to passive noise suppression, and fundamental frequency reflected light is subjected to further noise suppression in an active feedback control loop; the frequency doubling light serves as pump light to be injected into an optical parametric oscillator, a coherent control technology is used to generate a stable amplitude compression vacuum state light field, and the compression vacuum state light field and fundamental frequency reflection light after passive and active noise suppression are coupled on a 99: 1 beam splitter to generate bright low-frequency amplitude compression light; the method is applied to bright low-frequency compressed light generation.

A calculation device of the present disclosure is characterized by implementing an item, which expresses a magnetic field, at each site by adding, to the conventional coherent Ising machine, a function for simulating the magnetic field item. Specifically, light having the amplitude of a predetermined sign is input in the conventional coherent Ising machine by dislocating an operation point of the push-pull-type optical modulator. When the operation point is dislocated to a + direction, DOPO (Degenerate Optical Parametric Oscillator) having the same wavelength as that of DOPO of an optical resonator and having a fixed initial phase difference from pump light into which the light is injected considerably tends to oscillate at 0 phase, and becomes reversed when the operation point is dislocated to a minus direction.

The invention provides a method for improving the wavelength tuning speed of an optical parametric oscillator. The repetition frequency adjustable pump laser outputs preset repetition frequency light, the light enters the frequency selection module after being amplified by the pre-amplification module, and the light is converted into 1 / N times of preset repetition frequency light according to the frequency selection ratio N. Afterwards, the light with the 1 / N times of preset repetition frequency is subjected to power compensation through the amplification module, enters the parameter conversion module through the coupler, generates signal light and idler frequency light, and is partially output by the output module, and the remaining light is sent back to the coupler module through the feedback module, so that intracavity resonance and parameter conversion are realized. When the cavity length of the repetition-frequency adjustable pump laser is changed by dL, the repetition-frequency adjusting amount is df, after the light passes through the frequency selection module, the repetition-frequency variable amount of the light is df / N which is equivalent to the repetition-frequency variable amount of the light in the optical parametric oscillator, and the corresponding cavity length is changed by N * dL, so that the output wavelength is also changed by N times. According to the method, the wavelength tuning speed of the optical parametric oscillator can be greatly improved, and compared with a traditional method, wavelength tuning is achieved faster.

A lidar system for simultaneously measuring the column concentration of methane and the profile concentration of water vapor in the atmosphere is disclosed. The device includes a laser emission module: a 1645nm monoline seed laser, a 1645nm offline1 seed laser, a 1645nm offline2 seed laser, a 1064nm pump laser, a laser frequency-locking module, an optical parametric oscillator, a frequency doubling module, and emitting optical components; an echo receiving module: an integrating sphere module, an optical receiving telescope assembly, a beam splitter, filter assembly 1, filter assembly 2, photodetector 1, and photodetector 2; and a data acquisition and processing module. This invention utilizes the frequency doubling relationship between the absorption lines of methane and water vapor to simplify the complex structure of a dual-band, multi-wavelength laser. It employs seed-injected optical parametric oscillator technology to obtain a high-frequency stable 1645nm fundamental frequency light, which is then frequency-doubled to obtain an 822nm laser. The profile concentration of water vapor and the column concentration of methane in the atmosphere can be measured using differential absorption lidar (DIAL) and integral path differential absorption (IPDA) technologies, respectively.

A stimulated Raman photothermal (SRP) microscope for imaging a sample. A first optical source without an optical resonator emits a pump beam. A second optical source emits an intensity-modulated Stokes beam. The Stokes beam is combined with the pump beam to form a combined beam. The combined beam is directed to the sample to induce a thermal effect caused by the stimulated Raman process. A third optical source emits a probe beam, the probe beam is directed to the sample. An optical detector detects modulation of the probe beam after modulation by the sample to measure an SRP signal. Because noise in the pump and Stokes beam do not significantly effect the measurements from the probe beam, these beams can use a high-powered optical parametric amplifier (OPA) source for improved sensitivity and imaging speed compared to SRP microscopes using an optical parametric oscillator (OPO) source.

The invention provides a preparation method and application of a compound cesium ammonium fluoborate and a cesium ammonium fluoborate nonlinear optical crystal. The chemical formula of the compound is CsNH4B8O12F2; the chemical formula of the crystal is CsNH4B8O12F2, the crystal belongs to a trigonal system, the space group is P321, and the unit cell parameters are as follows: a = b = 6.5858 (4) + / -0.02, c = 7.8163 (6) + / -0.02, alpha = beta = 90 degrees, gamma = 120 degrees and Z = 1. The crystal is grown by adopting a vacuum high-temperature solution method, a room-temperature solution method or a hydrothermal method, and the ultraviolet transmission cut-off edge of the crystal is lower than 190 nm. The nonlinear optical effect of the crystal is about 2.5 times of that of KH2PO4 (KDP), and the shortest I-type phase matching wavelength is 175.5 nm. The crystal has the advantages of simple preparation method, low toxicity of used initial raw materials, small harm to human bodies, stable physical and chemical properties, uniaxial crystal, easiness in application and the like. The method can be widely applied to nonlinear optical devices such as ultraviolet and deep ultraviolet all-solid-state lasers, optical parametric oscillators and the like.

The mid-infrared optical parametric oscillator pumped by the dual-wavelength nanosecond pulse solid laser can simultaneously output 1.9 micron laser and 2.1 micron laser, realizes broad spectrum / multi-wavelength output of the mid-infrared optical parametric oscillator, and can ensure that mid-infrared laser has excellent beam quality and relatively high output power. The output power of the 1.9 [mu] m optical fiber laser pumping source is hectowatt magnitude, and the 1.9 [mu] m optical fiber laser pumping source serves as a pumping source of a Ho crystal in the solid laser oscillator. In a Tm solid laser oscillator and a Ho solid laser oscillator, a resonant cavity comprises two plano-concave sub-cavities, the two plano-concave sub-cavities are a Tm crystal oscillation cavity and a Ho crystal oscillation cavity respectively, the two plano-concave sub-cavities share one output mirror, the Tm crystal oscillation cavity adopts a 793 nm semiconductor laser for pumping, and the Ho crystal oscillation cavity adopts a 1.9 [mu] m optical fiber laser pumping source I for pumping; in the phosphorus-germanium-zinc optical parametric oscillator, a planar four-mirror annular cavity is used as a single-resonance optical parametric oscillation cavity.

A stimulated Raman photothermal (SRP) microscope for imaging a sample. A first optical source without an optical resonator emits a pump beam. A second optical source emits an intensity-modulated Stokes beam. The Stokes beam is combined with the pump beam to form a combined beam. The combined beam is directed to the sample to induce a thermal effect caused by the stimulated Raman process. A third optical source emits a probe beam, the probe beam is directed to the sample. An optical detector detects modulation of the probe beam after modulation by the sample to measure an SRP signal. Because noise in the pump and Stokes beam do not significantly effect the measurements from the probe beam, these beams can use a high-powered optical parametric amplifier (OPA) source for improved sensitivity and imaging speed compared to SRP microscopes using an optical parametric oscillator (OPO) source.

The invention relates to a device for generating laser pulses. It is the object of the invention to make the frequency range of molecular vibrations of 0-700 cm−1, which is highly interesting for a large number of applications of coherent Raman spectroscopy / microscopy, accessible. For this purpose, the device proposed by the invention comprises:a pump source which is configured to emit pulsed pump laser radiation with a first spectral bandwidth,a beam splitting element which is configured to split the pump laser radiation into two or more separate beam paths,at least one spectral filter element which is arranged in one of the beam paths, wherein the spectral passband of the filter element is smaller than the spectral bandwidth of the pump laser radiation, andat least one optical parametric oscillator or amplifier which is configured to convert the spectrally filtered pump laser radiation supplied to it via one of the beam paths at least in part into laser radiation at a signal wavelength and into laser radiation at an idle wavelength different from the signal wavelength. The invention also relates to a method for generating laser pulses.

This application discloses an optical parametric oscillator and a laser generating device, relating to the field of laser technology. The optical parametric oscillator includes a first optical fiber, a mirror assembly, a nonlinear crystal, and a second optical fiber. The first optical fiber has a first receiving end and a first output end. The first receiving end is used to receive pump light. The second optical fiber has a second receiving end and a second output end. Light output from the first output end can be transmitted to the second receiving end via the mirror assembly and the nonlinear crystal. The second output end is used to output signal light. The mirror assembly includes multiple mirrors. The nonlinear crystal is located in the optical path between two mirrors. A first grating is disposed on the first optical fiber, and a second grating is disposed on the second optical fiber. Both the first and second gratings are fiber Bragg gratings. Because this application uses a first optical fiber and a second optical fiber to define the light transmission path, compared to a free-space optical path, the optical fiber can be coiled, which is beneficial for reducing the overall size and improving integration.

The invention discloses a high-efficiency optical parametric oscillator, and belongs to the technical field of lasers, the high-efficiency optical parametric oscillator comprises a pumping source output assembly, a coupling system, a first resonant cavity mirror and a nonlinear crystal which are sequentially arranged along the direction of an optical path, a dispersion prism is arranged at a light outlet of the nonlinear crystal, and the dispersion prism can divide light into signal light and idler frequency light; the dispersion prism and the light source are transmitted along a first light path and a second light path respectively, a second resonant cavity mirror is arranged on the first light path, an optical parameter adjusting assembly is arranged between the dispersion prism and the second resonant cavity mirror, and a third resonant cavity mirror is arranged on the second light path. According to the high-efficiency optical parametric oscillator provided by the invention, the light-light conversion efficiency and high light beam quality of parametric light can be simultaneously obtained under different power pumps under the conditions of not changing a cavity type structure and not needing to be reassembled and adjusted under the different power pumps.

This invention relates to a potassium hydroxyborate nonlinear optical crystal, its preparation method, and its applications. The crystal has the chemical formula K₂B₅O₈(OH), a molecular weight of 277.26, belongs to the orthorhombic crystal system, and has a space group of [missing information]. Pca 21, with unit cell parameters a=8.5523(8)Å, b=7.3326(7)Å, c=12.9739(10)Å, α=β=γ=90°, V=813.60(13)Å. 3 A nonlinear optical crystal composed of potassium hydroxyborate can be obtained using a mild hydrothermal (solvothermal) method through programmed or natural cooling. The frequency doubling effect of this crystal powder is approximately twice that of KDP (KH₂PO₄), and its ultraviolet cutoff edge is below 200 nm, making it suitable as a deep-ultraviolet nonlinear optical crystal. The crystal growth process offers advantages such as simple operation, low raw material toxicity, short growth cycle, low cost, and stable physicochemical properties. It has been widely applied in the fabrication of nonlinear optical devices such as frequency doubling generators, up- or down-frequency converters, or optical parametric oscillators.

The invention discloses an external cavity type annular human eye safety optical parametric oscillator, and relates to the technical field of laser. The oscillator sequentially comprises a first cavity mirror, a first nonlinear crystal, a second cavity mirror, a second nonlinear crystal, a third cavity mirror and a third nonlinear crystal, the pump light is converted into human eye safety laser through optical parameters to be output, and the remaining pump light is transmitted and output from the first cavity mirror. An external cavity type OPO technology and a three-mirror annular cavity structure are adopted, a plurality of nonlinear crystals are placed in an annular cavity to fully absorb pump light, high conversion efficiency can be obtained under low pump power density, the problem that optical devices are damaged due to the fact that the power density in an internal cavity type OPO cavity is too high is solved, pump light pumping is an annular route, and the pumping efficiency is greatly improved. And the residual pump light cannot return to the pump light resonant cavity, so that the reliability of the laser is improved.

The present disclosure belongs to the field of photoacoustic signal detection, and specifically relates to a quantum-enhanced all-optical photoacoustic signal detection device and method. The problem of low sensitivity of photoacoustic signals based on interference measurement is solved, and high-sensitivity detection of photoacoustic signals generated by living organisms including human bodies can be achieved. A degenerate optical parametric oscillator based on a first-type phase matching crystals is used for preparing a vacuum squeezed state light field, a coherent control technology is used for locking the squeezed angle to obtain the quadrature phase vacuum squeezed state, the prepared quadrature phase vacuum squeezed state light field is injected into the vacuum channel of a Michelson interferometer, and a balanced homodyne detection mode is used for achieving detection of the quantum-enhanced photoacoustic signals.

The present invention relates to a nonlinear optical converter (11) for a laser radiation source which comprises a pump laser for generating a pump laser beam, the nonlinear optical converter comprising: a first optical parametric oscillator (OPO) crystal (2) which faces the pump laser and which is designed to generate, from the pump laser beam (6), a first pair of gain bands, in particular a signal band and an idler band, as well as residual pump radiation, and which has a first phase-matching angle (7); and a second optical parametric oscillator (OPO) crystal (3) which is arranged downstream of the first optical parametric oscillator (OPO) crystal (2) and is designed to generate, from the residual pump radiation, a second pair of further gain bands, in particular a signal band and an idler band.

The invention provides an optical parametric oscillator. The optical parametric oscillator comprises a light beam emitting device and an optical parametric oscillation device. The optical parametric oscillation device comprises an oscillation cavity, a first nonlinear crystal and a second nonlinear crystal, wherein the first nonlinear crystal is arranged in the oscillation cavity and meets I-type phase matching, the second nonlinear crystal is arranged in the oscillation cavity and meets II-type phase matching, and the length ratio of the first nonlinear crystal to the second nonlinear crystal in the optical axis direction ranges from 1: 9 to 9: 1. When the optical parametric oscillation device works, fundamental frequency pump light emitted by the light beam emitting device enters the oscillation cavity, two beams of parametric light are generated under the action of the first nonlinear crystal and the second nonlinear crystal, the parametric light is resonated through the optical parametric oscillation device, and finally the required parametric light is output. Wherein the spectral line widths of the parametric light with the same wavelength generated by the first nonlinear crystal and the second nonlinear crystal are different, the first nonlinear crystal and the second nonlinear crystal are simultaneously placed in the oscillation cavity along the optical axis direction, and the output of the parametric light with different spectral line widths is realized by adjusting the length proportion of the two nonlinear crystals.

The present application belongs to but is not limited to the technical field of oscillator, and particularly relates to a cavity length locking system and method of a pulse type optical parametric oscillator, comprising an OPO pulse light source, a pulse width feedback locking loop and a power-based auxiliary locking loop; the OPO pulse light source comprises a seed pulse light source and an OPO resonant cavity; the pulse width feedback locking loop is composed of a pulse width measuring device, a signal processing circuit and a cavity length control element; the power-based auxiliary locking loop is composed of a power signal measuring device, a signal processing circuit and a cavity length control element. The locking system works simultaneously using the pulse width feedback locking loop and the power-based auxiliary locking loop. The pulse width feedback locking loop has a Hz level bandwidth and a high gain feature, and the power-based auxiliary locking loop has a kHz-MHz level larger bandwidth. The two are matched for application, and can realize more stable OPO cavity length locking.

This invention discloses a two-dimensional infrared spectroscopy system and its detection method that combines acid-base step and pulsed heating. The system includes a femtosecond laser, an optical parametric amplifier and difference frequency generator, a frequency divider, an electronic time delay generator, a nanosecond laser, a detachable optical parametric oscillator providing 355nm light pulses, an optical parametric oscillator providing 2020nm light pulses, a monochromator and a mercury cadmium telluride array detector, an integrator and data acquisition card, a computer, a chopper, a time-resolved pulse generation chamber, and a sample chamber. This invention retains the original pulsed heating trigger mode by using a nanosecond light source with a detachable optical parametric oscillator providing 355nm light pulses. It achieves convenient switching between the acid-base step and pulsed heating modes through a dichroic mirror and a reversible reflector. Before and after switching, the propagation direction of the nanosecond pulses is completely consistent, and the relative time delay is corrected by the electronic time delay device.

The application relates to a high-power mid-infrared optical parametric oscillation amplification device directly pumped by a Tm laser, and belongs to the technical field of high-power mid-infrared lasers. The device comprises a Tm:YLF seed laser, a Tm:YLF slab amplifier, a ZGP optical parametric oscillator and a ZGP optical parametric amplifier in sequence. The Tm:YLF seed laser outputs 1.908-micron fundamental light, the power of the 1.908-micron fundamental light is amplified through the Tm:YLF slab amplifier, and then the ZGP optical parametric oscillator and the ZGP optical parametric amplifier are directly pumped. The injection end and the output end of the Tm:YLF slab amplifier are both provided with a fundamental light coupling isolation system. A mid-infrared laser coupling isolation system is arranged between the ZGP optical parametric oscillator and the ZGP optical parametric amplifier. The ZGP optical parametric oscillator and the ZGP optical parametric amplifier are directly pumped by high-power Tm:YLF lasers, so that the power of the mid-infrared laser and the overall efficiency of the system are improved.

The purpose of the present invention is to provide an optical computer having high scalability and capable of reducing noise. This optical computer is characterized by including: an input layer which accepts an input signal as a computer; a reservoir layer which responds to a signal input from the input layer, and in which using a plurality of degenerate optical parametric oscillator (DOPO) pulses of a DOPO that are generated by an optical phase-sensitive amplifier (PSA) based on pump light as nodes, a connection relation between the nodes is determined by a measurement feedback method or a method equivalent to the measurement feedback method; and an output layer which outputs an output signal based on the respective responses of the plurality of DOPO pulses to the input signal from the reservoir layer.

The invention provides a sequence pulse optical parametric oscillation laser for combustion field measurement. The sequence pulse optical parametric oscillation laser for combustion field measurement comprises an optical fiber laser, a solid amplifier, an optical parametric oscillator and a frequency doubling and light splitting unit. The fiber laser is used for continuously outputting pulse laser as seed laser, and the repetition frequency of the seed laser can be controlled and adjusted. The seed laser is configured to enter a solid state amplifier capable of outputting a sequence pulse laser. The sequence pulse laser is configured to enter an optical parametric oscillator to change wavelength. And the frequency doubling and light splitting unit is configured in a light path formed by the fiber laser, the solid amplifier and the optical parametric oscillator, and can adjust the frequency of the laser, so that the laser of 283nm can be finally output. The fiber laser is used as a seed laser of the front end, pulse energy storage amplification is achieved through the solid amplifier, sequence pulse output can be achieved, and the pulse interval is convenient to adjust.

The present application discloses a single-frequency continuous-wave optical parametric oscillator, comprising a pumping source, a focusing lens, a resonant cavity, an optical parametric down-conversion crystal, and a birefringent crystal. The resonant cavity comprises a concave-convex lens, an output planoconcave lens, and at least two transitional planoconcave lenses; and a waist spot of pump light obtained through the focusing lens is located between the concave-convex lens and a first transitional planoconcave lens adjacent to the concave-convex lens on a light path. The center of the optical parametric down-conversion crystal coincides with a waist spot of the pump light; the birefringent crystal is located at the beam waist between the output planoconcave lens and the second transitional planoconcave lens adjacent to the output planoconcave lens on the light path; and the birefringent crystal adopts a critical phase matching or non-critical phase matching mode.