91 results about "Optical parametric oscillator" patented technology

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.

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.

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.

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 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 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 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.

The invention discloses an ultra-short pulse optical parametric oscillator based on a bicrystal structure, and relates to a laser and an assembly, and the oscillator comprises a first beam shaper (2) which is used for shaping idler frequency light (1); a second beam shaper (4) for shaping the pump light (3); a dichroscope (5); the first nonlinear crystal (6) is arranged on a light emitting path of the dichroscope (5), and the first nonlinear crystal (6) is used as an input coupling mirror of the optical parametric oscillator; the second nonlinear crystal (7) is arranged on a light emitting path of the first nonlinear crystal (6), and the first nonlinear crystal (6) and the second nonlinear crystal (7) form a resonant cavity; and the three-direction color mirror (9) is arranged on a light emitting path of the second nonlinear crystal (7) and is used for separating the pump light, the signal light (8) generated by nonlinear frequency conversion and the amplified idle frequency light (1) and transmitting and outputting the idle frequency light. The conversion efficiency of the optical parameter amplification process is improved, and the overall amplification performance of the optical parameter amplifier is guaranteed.

The application discloses a kind of high stability optical parametric oscillator assisted by intelligent feedback algorithm, and relates to the technical field of optical parametric oscillator.The oscillator includes 515 nm pump laser source, half-wave plate, polarization beam splitter, plane mirror, dichroic mirror, concave focusing cavity mirror, nonlinear crystal, output coupling mirror, four-quadrant photodetector based on STM32, DAC high-voltage drive board and piezoelectric deflection mirror.The application utilizes four-quadrant photodetector to monitor laser output power in real time, and collects data through the combination of ADC and direct memory access (DMA), realizes double buffering operation by means of full transmission and half transmission mechanism, to efficiently obtain the performance indicators required by SPGD algorithm.The algorithm continuously iterates and optimizes, controls piezoelectric deflection mirror in real time, precisely adjusts cavity length and beam pointing, and effectively stabilizes laser output power.

Wavelength-tunable source of pulsed laser radiation for VIS-NIR spectroscopy which consists of a pump source (1) forming bursts of picosecond pulses of high pulse repetition rate, and a synchronously pumped optical parametric oscillator (2). The pump source (1) comprises a solid-state regenerative amplifier (31) having one or two electro-optical switches (32,33) inside its resonator (44). The switches create partial transmission of the resonator for a time interval longer than a resonator roundtrip time, and eject a part of energy of a pulse circulating inside. Bursts of 5-10 ns duration are formed, which are filled with high peak power picosecond pulses. Pulse repetition rate of the order of GHz of pump pulses allows the construction of a compact optical parametric oscillator. The whole set of parameters ensures high energy efficiency, stability and an ability to provide output pulse bursts repeating at up to 10 kHz repetition rate.

The application discloses a device and method for generating 193nm waveband ultraviolet laser, which comprises a near-infrared laser driving unit 1, a nonlinear frequency conversion system 2 and an ultraviolet laser generating system 3 connected in sequence. The near-infrared laser driving unit is a high-power picosecond laser for generating near-infrared laser with a wavelength of 1064nm. The near-infrared laser is divided into two parts by a beam splitter, one part of which is used as pump light of a first optical parametric oscillator (OPO1) and generates 840nm laser, and the 840nm laser is converted into 210nm laser through four frequency doubling; the other part is directly used as pump light of a second optical parametric oscillator (OPO2) and generates 2380nm laser. In the last ultraviolet laser generating system, the 210nm laser and the 2380nm laser are combined through sum frequency mixing to finally realize the output of 193nm waveband ultraviolet laser. The application provides a new idea and technical route for the development of vacuum ultraviolet 193nm waveband solid-state laser by using mature nonlinear crystal and nonlinear frequency conversion process.

The application provides a narrow linewidth continuous tuning middle infrared optical parametric oscillator and a working method thereof. The middle infrared optical parametric oscillator comprises a pump source, a convex lens, a plane mirror, a MgO:PPLN crystal, a concave mirror, a first etalon, a second etalon and a plane output mirror which are arranged in sequence along an optical path in a resonant cavity. The MgO:PPLN crystal is placed in a temperature control furnace, the first etalon is provided with a heating sheet, and the thickness of the first etalon is greater than that of the second etalon. On the basis of crystal temperature tuning, the application combines a thermal tuning etalon to realize continuous wavelength tuning output.

A kind of lidar technology for atmospheric waveguide fast measurement, temperature and humidity profile, the key factor of atmospheric waveguide, can be measured simultaneously, the device includes laser emission module: 822nm online seed laser, 822nm offline seed laser, 1064nm pump laser, laser frequency locking module, optical parametric oscillator, acoustooptic modulator, frequency doubling module and emission optical assembly;Echo receiving module: optical receiving telescope and optical lens assembly, F-P filter, polarization light splitting prism, iodine molecular absorption cell, Fizeau interferometer and photodetector;Data acquisition and processing module.The present application fuses differential absorption lidar and two detection systems based on interferometer high spectral lidar, adopts seed injection optical parametric oscillator laser technology, obtains high frequency stability 822nm laser to realize atmospheric humidity profile fast measurement, remaining 532nm laser realizes atmospheric temperature profile fast measurement, finally inverts atmospheric waveguide parameter, realizes atmospheric waveguide efficient and accurate measurement.

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.

The present application relates to a kind of Gaussian mirror unstable cavity optical parametric oscillator double-pass pumping structure and its building method, including the OPO input mirror, nonlinear crystal, OPO output coupling mirror, 45 degree beam splitter, concave lens, 0 degree high reflectivity lens placed in order along the light path in sequence;OPO input mirror and OPO output coupling mirror are curved mirror, the curvature of OPO input mirror is R1, the curvature of OPO output coupling mirror is R2, R1 is positive, R2 is negative.The present application is based on the defect of existing unstable cavity Gaussian output mirror coating technology to realize double-pass pumping structure, innovatively proposes cavity mirror combination idea, uses 45 degree beam splitter and 0 degree high reflectivity lens combination, realizes pump light double-pass pumping, innovatively adds concave lens in pump light return light path to compensate the focusing effect caused by unstable cavity lens, improves the output energy of signal light and idler light, expands the application scenario of Gaussian mirror unstable cavity optical parametric oscillator.

To provide a vertical resonator optical parametric oscillator. [Solution] In some embodiments, a vertical resonator optical parametric oscillator may be provided. The vertical resonator optical parametric oscillator may include a first mirror layer, a second mirror layer, and a nonlinear optical layer between the first and second mirror layers. The nonlinear optical layer may be configured to resonate both the fundamental harmonic optical signal and the second harmonic optical signal. Each of the first and second mirror layers may have a reflective surface for both the fundamental harmonic optical signal and the second harmonic optical signal to be reflected back and forth within the nonlinear optical layer.

The invention relates to a high-repetition-frequency narrow-pulse-width 1645nm non-planar laser, which comprises three parts, namely a pump laser injection system, a seed laser injection system and a spatial four-mirror-cavity optical parametric oscillator system. The laser has the advantages that the beam quality is high, the injection energy of the pump light is adjustable, the injection light spots and the power density of the pump light and the seed light are adjustable, the service life of the nonlinear crystal is long, the tuning range is wide, and three wavelengths are output; the high-repetition-frequency large-pulse-energy high-beam-quality laser light source can be widely applied to a plurality of applications such as laser radar systems, remote sensing, telemetering and range finders, and is an important laser light source.

The invention discloses a mid-infrared laser with tunable broadband wavelength, which comprises an electric control optical parametric oscillator, a nonlinear gain part of the electric control optical parametric oscillator is periodically poled lithium niobate, a laser incident surface and a laser emergent surface of the periodically poled lithium niobate are plated with endoscope films to form a resonant cavity, and the resonant cavity is formed by applying voltage to the periodically poled lithium niobate. By changing the polarization state of the light, the wavelength tuning range of the mid-infrared laser can be 2.5-4.0 [mu] m.

The invention discloses a picosecond optical fiber optical parametric oscillator based on acousto-optic wavelength tuning, which comprises an embedded integrated control platform, and the embedded integrated control platform controls a mode-locked laser seed source, a narrow-spectrum high-power tunable pumping source and an optical fiber optical parametric resonant cavity in a coordinated manner; the mode-locked laser seed source adopts a mode-locked laser oscillator as a seed source, a tunable spectrum filter and a laser amplifier are arranged behind the mode-locked laser seed source, and the tunable spectrum filter can also be arranged in a resonant cavity of the mode-locked laser oscillator. And a laser amplifier is arranged behind the mode-locked laser oscillator to obtain narrow-spectrum high-power tunable pulse laser. On the basis of the laser saturation gain amplification process of bi-pass filtering, narrow-spectrum, high-power and picosecond pulse laser output with the adjustable center wavelength of 1035-1065 nm is achieved, and on the basis of the optical fiber optical parametric oscillation process, high-power, narrow-spectrum and picosecond pulse laser output with the rapidly-adjusted center wavelength of 785-985 nm is achieved.

The present application relates to a kind of light beam pointing stability large rotation angle tuning short wave infrared coherent light source, and the present coherent light source includes: pump laser, magneto-optical isolator, condensing lens group, two 45 ° reflector, optical parametric oscillator (OPO), optical filter, fixed right-angle prism and mobile right-angle prism.The pump laser is used to generate pump light;The magneto-optical isolator is used to ensure one-way transmission of laser;The condensing lens group is used to improve beam energy density;Two 45 ° reflector is used to fold pump light path;The optical parametric oscillator is used to generate coherent short wave infrared light;The nonlinear crystal is used to adjust the output wavelength of short wave infrared light source;The optical filter is used to block remaining pump light;Fixed right-angle prism and displacement right-angle prism are used to compensate the lateral displacement of output beam caused in the process of crystal rotation.The present application compensates the lateral displacement of light beam by moving prism, realizes the position of output beam unchanged in the process of large rotation angle tuning, ensures its directionality stability, and is suitable for spectral analysis, remote sensing and imaging and other needs.

The application discloses a kind of simultaneously generating 310nm and 355nm high-energy laser full solid-state ultraviolet laser, belongs to the technical field of laser.The frequency-doubled module of fundamental laser and it, intracavity sum-frequency module of optical parametric oscillator, sum-frequency module three parts, make full use of the output energy of 1064nm pulsed laser, adopt frequency conversion technology such as frequency doubling, optical parametric oscillation, sum-frequency, realize 310nm and 355nm ultraviolet pulsed laser output.The application has the advantages of multi-wavelength, high energy, high beam quality, compact structure, and the ultraviolet band is in ozone absorption band, especially suitable for the detection of troposphere and stratosphere atmospheric ozone concentration by spaceborne laser radar.

The invention belongs to the technical field of lasers. The invention provides an optical parametric oscillator based on a double compensation structure and secondary pumping energy extraction. The optical parametric oscillator comprises a pumping light input unit, a four-mirror plane annular cavity unit, a parametric gain unit composed of four KTA crystals, a signal light polarization control unit, a dichroscope light splitting unit and a residual pumping multiplexing and time sequence adjusting unit. The four crystals are divided into two paths, the two crystals in each path complete walk-off compensation in pairs, meanwhile, the two crystal pairs achieve transverse gain asymmetry caused by walk-off direction orthogonality, exchange and averaging through orientation transformation, transverse cavity mode offset compensation is achieved, and the spatial output characteristic of parametric light is effectively improved. The first path of residual pump light is guided to the second path of crystal for secondary energy extraction after separation and time sequence adjustment, so that the conversion efficiency is remarkably improved. According to the invention, laser output with high average power, high light beam quality and consistent two-axis divergence trend is realized.

An apparatus includes a photonic integrated circuit including: an optical parametric oscillator (OPO) that outputs at least one of signal light or idler light in response to pump light; and at least one of a source of pump light coupled to the OPO, an external injection lock input, or an auxiliary resonator. Tuning over a wide range and / or a difficult-to-reach wavelength region of coherent radiation generated on-chip (i.e., laser-like radiation) in an integration platform can be performed. And the target spectrum coverage exceeds the spectrum coverage which can be realized by the existing integrated laser system.

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 utility model discloses an all-fiber structure monolithic optical parametric oscillator device based on a PPLN waveguide. The all-fiber structure monolithic optical parametric oscillator device mainly comprises a pump light source, a monolithic optical parametric oscillator and a filtering module which are connected through a single-mode fiber. By means of the unique design of a monolithic optical parametric oscillator (and a temperature control module thereof) and a filtering module, double-end coating is allowed to be coupled with low-loss optical fibers, the monolithic optical parametric oscillator device of an all-fiber structure is achieved, the monolithic optical parametric oscillator device has higher stability compared with a spatial optical path, meanwhile, transmission loss between optical elements is avoided, and the optical parameter is more stable. And meanwhile, the scheme is simple in overall structure and low in cost, and can be applied to a complex environment.

The invention relates to the technical field of ultrafast laser, in particular to an optical parametric oscillator for generating a GHz repetition frequency femtosecond vortex beam, and the optical parametric oscillator comprises a pumping source which is used for generating a GHz repetition frequency femtosecond laser as pumping light; the pumping shaping module is used for shaping a light spot of the pumping light into an oval shape; the resonant cavity is used for generating signal light in a Hermite-Gaussian beam mode based on the pump light after the light spot is shaped to be oval; and the mode conversion module is used for converting the signal light from the Hermitian beam into a vortex beam with a corresponding order. By adjusting the position of a first spherical convex lens of the pumping shaping module along the light path direction, the size of an elliptical pumping light spot at the center of the crystal can be changed, and meanwhile, the order of a Hermitian beam is adjusted by finely adjusting the inclination angle of an output coupling mirror of the resonant cavity along the long axis direction of the elliptical pumping light spot at the center of the crystal. Therefore, the order of the vortex light beam after mode conversion can be adjusted.

The invention relates to a fluorinated biuret borate nonlinear optical crystal and a preparation method and application thereof, the chemical formula of the crystal is [C2N3O2BF2H5] [BF4], the molecular weight is 238.71, and the crystal is prepared by a hydrothermal method or a room temperature solution method; the crystal belongs to a monoclinic system, the space group is P21, and the cell parameters are as follows: a = 6.0521 (11), b = 9.4651 (18), c = 7.1398 (12), beta = 91.267 (7), Z = 2, and V = 408.90 (13) 3. The [C2N3O2BF2H5] [BF4] nonlinear optical crystal obtained by the method is used for manufacturing a second harmonic generator, an upper frequency converter, a lower frequency converter, an optical parametric oscillator and the like; meanwhile, the crystal can also be used as a birefringent crystal for manufacturing a refractive index modulator, a phase modulator and a polarization device.