CN114784607A - Tunable optical parametric oscillator - Google Patents
Tunable optical parametric oscillator Download PDFInfo
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- CN114784607A CN114784607A CN202210363705.4A CN202210363705A CN114784607A CN 114784607 A CN114784607 A CN 114784607A CN 202210363705 A CN202210363705 A CN 202210363705A CN 114784607 A CN114784607 A CN 114784607A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/1083—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using parametric generation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention relates to the technical field of laser, in particular to a tunable optical parametric oscillator, which comprises an optical fiber laser, a pump optical coupling device, a nonlinear crystal, a crystal temperature control furnace and a resonant cavity mirror, wherein the pump optical coupling device is connected with the nonlinear crystal; the fiber laser is used for outputting tunable pulse linear polarization pump laser; the pump light coupling device is used for isolating, beam-shrinking and polarization state adjustment of the tunable pulse linear polarization pump laser; the nonlinear crystal is used for generating signal light and idler frequency light; the crystal temperature control furnace is used for controlling the working temperature of the nonlinear crystal; the resonant cavity mirror is used for oscillating signal light; the tunable optical parametric oscillator can change the pumping wavelength by electrically controlling and changing the transmission wavelength of the tunable optical fiber filter in the seed optical fiber laser without changing the angle, the working temperature or the polarization period of a crystal, thereby realizing the large-range quick tuning of signal light and idler frequency light.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a tunable optical parametric oscillator.
Background
The Optical Parametric Oscillator (OPO) can convert pump laser light (with frequency ω p) into two signal light (with frequency ω s) and idler light (with frequency ω i and ω i < ω s) with lower frequencies through a second-order nonlinear effect of a nonlinear crystal, and the sum of the frequencies of the signal light and the idler light is equal to the frequency of the pump light, that is, ω s + ω i ═ ω p. OPO is one of the important methods for tunable laser generation, enabling tuning over a wide frequency range.
For a nonlinear crystal adopting angle phase matching, the angle of the crystal is rotated to meet the phase matching conditions of different wavelength signals and idler frequencies, so that wavelength tunable laser output is realized, but the precision requirement on a rotary table is extremely high.
Meanwhile, for a nonlinear crystal adopting quasi-phase matching, the crystal is usually periodically polarized in a fixed period to realize quasi-phase matching (for example, Periodically Polarized Lithium Niobate (PPLN), Periodically Polarized Lithium Tantalate (PPLT), etc.), when the wavelength of a pump light is fixed, the wavelengths of a signal light and an idler frequency light are related to the polarization period of the crystal, and therefore, an OPO based on the quasi-phase matching crystal cannot realize wavelength tuning laser output by simply rotating the angle of the crystal, and the wavelength tuning method generally includes the following modes:
adjusting the working temperature of the crystal: when the temperature of the crystal changes, the refractive index and the polarization period of the crystal slightly change, so that the wavelengths of the signal light and the idler frequency light are tuned, but the method has the defects that the wavelength tuning range is small, the change of the working temperature of the crystal needs time, and the wavelength is not easy to tune quickly;
adopting a multi-channel periodically poled crystal: the crystal is provided with a plurality of channels, the polarization period of each channel is different, and the channels are switched through the displacement table, so that the laser output with different wavelengths can be realized, but the method has the defects that the wavelength cannot be continuously tuned, and the precision requirement on the displacement table is extremely high;
the method adopts a periodically poled crystal with a special structure: as shown in fig. 1 and fig. 2, a novel sector-shaped periodic or circular end-face periodic polarization crystal is adopted, and the polarization period can be continuously adjusted by transversely moving the crystal or rotating the crystal, so that the wavelength can be continuously tuned without changing the working temperature. However, for a sector periodic polarization crystal, because a laser spot generally has a certain width, the polarization period in the spot is inconsistent, narrow linewidth laser output is not easy to realize, for a circular end face periodic polarization crystal, the circular end face can affect the quality of a laser beam, the movement of the two crystals has extremely high precision requirement on a displacement table or a rotating table, and meanwhile, the crystal with a special structure is relatively complex to manufacture and has higher cost.
Disclosure of Invention
In order to solve the above problems, the present invention provides a tunable optical parametric oscillator with a novel structure, which can change the pump wavelength by electrically controlling to change the transmission wavelength of the tunable optical fiber filter in the seed optical fiber laser without changing the angle, the working temperature or the polarization period of the crystal, thereby realizing the large-scale fast tuning of the signal light and the idler frequency light.
In order to achieve the purpose, the invention adopts the following specific technical scheme:
the invention provides a tunable optical parametric oscillator, which comprises an optical fiber laser, a pumping optical coupling device, a nonlinear crystal, a crystal temperature control furnace and a resonant cavity mirror, wherein the optical fiber laser is connected with the pump optical coupling device;
the fiber laser is used for outputting tunable pulse linear polarization pump laser; the pump light coupling device is used for isolating, beam-shrinking and polarization state adjustment of the tunable pulse linear polarization pump laser; the nonlinear crystal is used for generating signal light and idler frequency light; the crystal temperature control furnace is used for controlling the working temperature of the nonlinear crystal; the resonator cavity mirror is used for oscillation of the signal light.
Preferably, the fiber laser includes a seed fiber laser, a fiber pre-amplifier and a fiber main amplifier; the seed optical fiber laser is used for generating first linearly polarized laser as tunable pulse linearly polarized seed laser of an optical fiber preamplifier; the optical fiber pre-amplifier is used for pre-amplifying the power of the first linearly polarized laser to generate a second linearly polarized laser; the optical fiber main amplifier is used for carrying out power amplification on the second linearly polarized laser to generate tunable pulse linearly polarized pump laser.
Preferably, the seed fiber laser is in a ring cavity structure; the seed optical fiber laser comprises a first semiconductor laser pumping source, a first beam combiner, a first polarization-preserving gain optical fiber, a tunable optical fiber filter, a first optical fiber isolator, an optical fiber coupler and an optical fiber acousto-optic modulator;
the first semiconductor laser pump source is used for providing first pump light for the seed optical fiber laser;
the first beam combiner is used for coupling the first pump light and the first linearly polarized laser which is not coupled out into the first polarization-preserving gain fiber;
the first polarization-preserving gain fiber is used for converting the energy of the first pump light into the energy of first linearly polarized laser light;
the tunable optical fiber filter is used for tuning the wavelength of the first linearly polarized laser;
the first optical fiber isolator is used for controlling the transmission direction of the first linearly polarized laser;
the optical fiber coupler is used for coupling part of the first linear polarization laser and outputting the coupled laser as seed laser;
the optical fiber acousto-optic modulator is used for modulating the optical fiber laser to form pulse laser.
Preferably, the optical fiber preamplifier includes a second semiconductor laser pump source, a second beam combiner, a second polarization-maintaining gain optical fiber, and a second optical fiber isolator;
the second semiconductor laser pumping source is used for providing second pumping light for the optical fiber preamplifier;
the second beam combiner is used for coupling the second pump light and the first linearly polarized laser output by the optical fiber coupler into the second polarization-maintaining gain optical fiber;
the second polarization-maintaining gain fiber is used for converting the energy of the second pump light into the energy of second linearly polarized laser light and amplifying the power of the first linearly polarized laser light output by the seed laser.
Preferably, the power of the second semiconductor laser pump source is greater than the power of the first semiconductor laser pump source.
Preferably, the optical fiber main amplifier comprises a third semiconductor laser pumping source, a third beam combiner, a third polarization-maintaining gain optical fiber and an optical fiber collimator;
the third semiconductor laser pumping source is used for providing third pumping light for the optical fiber positive amplifier;
the third beam combiner is used for coupling the third pump light and the second linearly polarized laser light into the third polarization-maintaining gain fiber;
the third polarization-maintaining gain fiber is used for converting the energy of the third pump light into the energy of the tunable pulse linear polarization pump laser and amplifying the power of the second linear polarization laser output by the fiber preamplifier;
the optical fiber collimator is used for collimating the tunable pulse linear polarization pump laser output by the optical fiber main amplifier.
Preferably, the power of the third semiconductor laser pumping source is greater than the power of the second semiconductor laser pumping source.
Preferably, the pump light coupling device comprises a spatial light isolator, a half-wave plate and a beam-shrinking mirror group; the beam reducing lens group comprises a convex lens and a concave lens.
Preferably, the resonant cavity mirror comprises a front cavity mirror and an output mirror;
the front cavity mirror transmits the fiber laser to the nonlinear crystal, the fiber laser is reflected back to the nonlinear crystal through the output mirror, the signal light oscillates between the front cavity mirror and the output mirror and repeatedly passes through the nonlinear crystal, and the idler frequency light is generated along with the signal light and is output from the output mirror and the signal light in the same path.
Preferably, the nonlinear crystal is a periodically poled crystal;
the front cavity mirror is plated with a first optical film, and the first optical film is highly transparent to the tunable pulse linear polarization pump laser, highly reflective to the signal light and highly reflective to the idler frequency light; the transmittance of the first optical film to the tunable pulse linear polarization pump laser is greater than 95%, the reflectivity of the first optical film to the signal light is greater than 95%, and the reflectivity of the first optical film to the idler frequency light is greater than 95%;
the output mirror is plated with a second optical film, and the second optical film is used for reflecting the tunable pulse linear polarization pump laser, partially reflecting the signal light and transmitting the idler frequency light; the reflectivity of the second optical film to the tunable pulse linear polarization pump laser is larger than 95%, the reflectivity of the second optical film to the signal light is 70%, and the transmissivity of the second optical film to the idler frequency light is larger than 95%.
The tunable optical parametric oscillator provided by the invention comprises an optical fiber laser, a pumping light coupling device, a nonlinear crystal, a crystal temperature control device and a resonant cavity mirror: the optical fiber laser is used for emitting pump laser with tunable wavelength; the pump light coupling device is used for isolating, beam shrinking, polarization state adjustment and the like of pump light, and coupling the pump light into the nonlinear crystal and the resonant cavity; the nonlinear crystal is used for converting the pump light into signal light and idler frequency light; the crystal temperature control device is used for controlling the working temperature of the nonlinear crystal; the resonant cavity mirror is used for realizing the oscillation of the parametric light.
The tunable optical parametric oscillator provided by the invention realizes tunable laser output of the tunable optical parametric oscillator by changing the wavelength of the optical fiber laser; namely, a tunable laser is used as a pumping source, the angle, the working temperature or the polarization period of a crystal do not need to be changed, and the large-range fast tunable laser output can be realized by changing the pumping wavelength.
Drawings
FIG. 1 is a schematic diagram of a sector period poled crystal in the prior art.
FIG. 2 is a schematic diagram of a prior art circular end-face periodically poled crystal.
Fig. 3 is a schematic diagram of a tunable optical parametric oscillator according to an embodiment of the present invention.
FIG. 4 is a graph showing the tuning relationship of a MgO: PPLN crystal in one embodiment of the present invention.
Reference numerals are as follows:
the device comprises a first LD pump source 1, a first beam combiner 2, a first polarization-preserving gain fiber 3, a tunable fiber filter 4, a first fiber isolator 5, a fiber coupler 6, a fiber acousto-optic modulator 7, a second LD pump source 8, a second beam combiner 9, a second polarization-preserving gain fiber 10, a second fiber isolator 11, a third LD pump source 12, a third beam combiner 13, a third polarization-preserving gain fiber 14, a fiber collimator 15, an optical isolator 16, a half-wave plate 17, a convex lens 18, a concave lens 19, a front cavity mirror 20, a nonlinear crystal 21, a crystal temperature control furnace 22 and an output mirror 23.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 3, which is a tunable optical parametric oscillator according to an embodiment of the present invention, it can be seen that the tunable optical parametric oscillator includes: the laser comprises an optical fiber laser for outputting tunable pulse linear polarization pump laser, a pump light coupling device for isolating, beam shrinking and polarization state adjustment of the tunable pulse linear polarization pump laser, a nonlinear crystal 21 for generating signal light and idle frequency light, a crystal temperature control furnace 22 for controlling the working temperature of the nonlinear crystal 21, and a resonant cavity mirror for signal light oscillation.
In a specific embodiment, the fiber laser includes 1 seed fiber laser for generating tunable pulse linearly polarized seed laser, 1 fiber preamplifier for pre-amplifying power of the tunable pulse linearly polarized seed laser, and 1 fiber main amplifier for amplifying power of the tunable pulse linearly polarized laser. Specifically, the seed fiber laser is used for generating a first linearly polarized laser as a tunable pulse linearly polarized seed laser of the fiber preamplifier; the optical fiber pre-amplifier is used for pre-amplifying the power of the first linear polarization laser to generate a second linear polarization laser; the optical fiber main amplifier is used for carrying out power amplification on the second linearly polarized laser to generate tunable pulse linearly polarized pump laser.
The seed fiber laser is used for generating first linearly polarized laser as tunable pulse linearly polarized seed laser of the fiber preamplifier, and specifically can output laser with a wave band of 1 micrometer and also can output laser with a wave band of 2 micrometers; when the first polarization maintaining gain fiber 3 in the seed fiber laser adopts a polarization maintaining Yb-doped fiber, 1 micron waveband laser is output; when the first polarization-maintaining gain fiber 3 in the seed fiber laser adopts a polarization-maintaining doped Tm, Ho or Tm/Ho co-doped fiber, 1.9-2.1 μm interval waveband laser is output.
In a specific embodiment, the seed fiber laser adopts an annular cavity design and specifically comprises a first semiconductor Laser (LD) pump source 1, a first beam combiner 2, a first polarization-preserving gain fiber 3, a tunable fiber filter 4, a first fiber isolator 5, a fiber coupler 6 and a fiber acousto-optic modulator 7; the seed fiber laser generates a first linear polarization laser, the first LD pump source 1 outputs a first pump light of 976nm, and the first pump light and the first linear polarization laser which is not coupled out are coupled to the first polarization maintaining gain fiber 3 through the first beam combiner 2.
Specifically, the first polarization maintaining gain fiber 3 adopts a polarization maintaining Yb-doped fiber, and generates linearly polarized 1 μm-band laser by stimulated radiation after absorbing the first pump light energy. The wavelength of the laser is tuned by the tunable optical fiber filter 4, the tunable optical fiber filter 4 is a band-pass filter, and the center wavelength of the transmission spectrum of the tunable optical fiber filter can be adjusted by electric control, so that the wavelength tuning of the seed optical fiber laser is realized, and the wavelength tuning range is 1.01-1.09 μm in the specific embodiment. The first fiber isolator 5 makes the seed laser transmit in one way in the annular cavity. The fiber acousto-optic modulator 7 performs acousto-optic Q-switching on the seed fiber laser to generate pulse laser. The seed laser is output to the fiber pre-amplifier through the fiber coupler 6.
The fiber pre-amplifier generates a second linearly polarized laser, and in an embodiment, includes a second semiconductor Laser (LD) pump source 8, a second beam combiner 9, a second polarization maintaining gain fiber 10, and a second fiber isolator 11. In particular, the second LD pump source 8 provides 976nm second pump light with a power higher than that of the first LD pump source 1, so that the fiber preamplifier obtains a second linearly polarized laser output with high power under a higher power pumping condition. The second beam combiner 9 couples the second pump light and the first linear polarization laser output by the optical fiber coupler 6 to the first double-clad polarization-maintaining gain fiber 10 of the optical fiber preamplifier, and the second polarization-maintaining gain fiber 10 may be a double-clad polarization-maintaining Yb-doped fiber, and can bear higher pump power by using the double clad, and perform power pre-amplification on the seed laser after absorbing the pump light energy. The second line of polarization laser after prevention is big and enters the optical fiber main amplifier through the second optical fiber isolator 11, and the second optical fiber isolator 11 can prevent the reflected light from the optical fiber main amplifier from returning to the optical fiber preamplifier, so that the damage of the device is avoided.
The structure of the optical fiber main amplifier is similar to that of the optical fiber preamplifier, and the optical fiber main amplifier generates tunable pulse linear polarization pump laser; in the specific embodiment, the fiber main amplifier includes a third semiconductor Laser (LD) pump source 12, a third beam combiner 13, a third polarization maintaining gain fiber 14, and a fiber collimator 15. The third LD pump source 12 provides 976nm third pump light, which has a higher power than the second LD pump source 8, and the number of the third LD pump sources 12 may be 1, 2 or more, and the total power thereof may be higher than that of the second LD pump source 8. The third combiner 13 couples the third pump light and the second linearly polarized laser to a third polarization maintaining gain fiber 14 of the fiber main amplifier, and the third polarization maintaining gain fiber 14 may be a double-clad polarization maintaining Yb-doped fiber, and after absorbing the energy of the third pump light, converts the energy of the third pump light into the energy of the tunable pulsed linearly polarized pump laser. The amplified tunable pulse linear polarization pump laser is collimated by the optical fiber collimator 15 and then enters the pump light coupling device.
The pump light coupling device comprises a spatial light isolator 16, a half-wave plate 17 and a beam reducing mirror group. The fiber laser firstly passes through the spatial optical isolator 16, and the spatial optical isolator 16 can prevent the backward reflected light of the tunable optical parametric oscillator from returning to the fiber main amplifier, so that the damage of the device is avoided. The tunable pulse linear polarization pump laser output by the spatial optical isolator 16 adjusts the polarization state through the half-wave plate 17 to meet the optimal phase matching condition, and then is subjected to beam reduction through the beam reduction mirror group. The beam-shrinking mirror group consists of a convex lens 18 and a concave lens 19, the diameter of a light spot of the tunable pulse linear polarization pump laser is reduced by matching the convex lens 18 and the concave lens 19, and beam shrinking with different multiplying powers can be realized by selecting different focal length combinations.
Tunable pulse linear polarization pump laser enters a nonlinear crystal 21 and a resonant cavity after passing through a pump optical coupling device, in a specific embodiment, the nonlinear crystal 21 is a periodically polarized crystal, and more specifically, the nonlinear crystal 21 can be a MgO-doped periodically polarized lithium niobate (MgO: PPLN) crystal, or a periodically polarized lithium tantalate crystal, and the like; taking a MgO PPLN crystal as an example, the MgO PPLN crystal converts the fiber laser into signal light and idler frequency light based on quasi-phase matching, and in a specific embodiment, the polarization period of the MgO PPLN crystal is 29.5 μm. The crystal temperature control furnace 22 is used for controlling the working temperature of the MgO PPLN crystal, which is 100 ℃ in the embodiment.
As shown in FIG. 4, in the embodiment of the invention, the polarization period of the MgO: PPLN crystal is 29.5 μm, the working temperature is 100 ℃, and when the pump light is tuned in the pumping interval of 1.01 μm to 1.09 μm, tunable signal light with the wave band of 1.47 μm to 1.51 μm and tunable idler light with the wave band of 3.10 μm to 3.93 μm are output; by tuning the wavelength of the tunable pulsed linearly polarized pump laser, the wavelength of the signal light and the wavelength of the idler can be tuned without changing the polarization period of the periodically polarized crystal.
When the tunable pulse linear polarization pump laser is tuned between 1.01-1.09 mu m, the tuning ranges of the corresponding signal light and idler light are respectively 1.47-1.51 mu m and 3.10-3.93 mu m. The resonant cavity comprises a front cavity mirror 20 and an output mirror 23, and the optical-optical conversion efficiency is improved by adopting the technical scheme of pump light double-communication signal light single resonance; specifically, the front cavity mirror 20 transmits the tunable pulse linear polarization pump laser into the MgO PPLN crystal 21, and then the tunable pulse linear polarization pump laser is reflected back to the MgO PPLN crystal through the output mirror 23, so that the tunable pulse linear polarization pump laser passes through the MgO PPLN crystal 2 times, the signal light oscillates between the front cavity mirror 20 and the output mirror 23 and repeatedly passes through the MgO PPLN crystal, and the idle frequency light is generated along with the signal light and directly output from the output mirror 23 in the same path with the signal light.
In a specific embodiment, the front cavity mirror 20 is coated with a first optical thin film, the first optical thin film is highly transparent to pump light with a wavelength of 1.01 μm to 1.09 μm, and highly reflective to tunable pulse linear polarization pump laser light with a wavelength of 1.47 μm to 1.51 μm and idler frequency light with a wavelength of 3.10 μm to 3.93 μm, specifically, the light transmittance of the pump light with a wavelength of 1.01 μm to 1.09 μm is greater than 95%; the reflectivity of signal light with wave band of 1.47-1.51 μm is more than 95%; the reflectivity of idler frequency light with the wave band of 3.10-3.93 mu m is more than 95 percent; so as to transmit the pump light into the MgO PPLN crystal and reflect the signal light and the idler light.
The output mirror 23 is coated with a second optical film, the second optical film is highly reflective to the pump light with the waveband of 1.01 μm to 1.09 μm, partially reflective to the signal light with the waveband of 1.47 μm to 1.51 μm, and highly transparent to the idle frequency light with the waveband of 3.10 μm to 3.93 μm, specifically, the reflectivity of the pump light with the waveband of 1.01 μm to 1.09 μm is more than 95%; the reflectivity of signal light with the wave band of 1.47-1.51 mu m is 70 percent; the transmissivity of idler frequency light with the wave band of 3.10-3.93 mu m is more than 95 percent; so as to reflect the pump light back to the MgO PPLN crystal and reflect part of the signal light to oscillate in the resonant cavity, and couple out the signal light and the idler light.
In the specific implementation mode of the invention, the wavelengths of the signal light and the idler light output by the tunable optical parametric oscillator are related to the crystal material, the polarization period, the working temperature and the pumping wavelength; in addition to the MgO PPLN crystal used in the above embodiments, when other nonlinear crystals are used, the polarization period of the crystal changes, the crystal material changes, or the pump wavelength band changes, and the wavelength bands of the signal light and the idler light also change, the coating films on the surfaces of the front cavity mirror 20 and the output mirror 23 also change accordingly.
The tunable optical parametric oscillator provided by the invention realizes tunable laser output of the tunable optical parametric oscillator by changing the wavelength of the tunable pump laser; namely, a tunable laser is used as a pumping source, the angle, the working temperature or the polarization period of a crystal do not need to be changed, and the large-range fast tunable laser output can be realized by changing the pumping wavelength.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be taken as limiting the invention. Variations, modifications, substitutions and changes to the embodiments described above will occur to those skilled in the art and are intended to be within the scope of the present invention.
The above embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A tunable optical parametric oscillator is characterized by comprising an optical fiber laser, a pumping optical coupling device, a nonlinear crystal, a crystal temperature control furnace and a resonant cavity mirror;
the fiber laser is used for outputting tunable pulse linear polarization pump laser;
the pump light coupling device is used for isolating, beam-shrinking and polarization state adjustment of the tunable pulse linear polarization pump laser;
the nonlinear crystal is used for generating signal light and idler frequency light; the crystal temperature control furnace is used for controlling the working temperature of the nonlinear crystal;
the resonator cavity mirror is used for oscillation of the signal light.
2. The tunable optical parametric oscillator of claim 1, wherein the fiber laser comprises a seed fiber laser, a fiber pre-amplifier, and a fiber main amplifier;
the seed optical fiber laser is used for generating first linearly polarized laser as tunable pulse linearly polarized seed laser of an optical fiber preamplifier;
the optical fiber pre-amplifier is used for pre-amplifying the power of the first linearly polarized laser to generate a second linearly polarized laser;
the optical fiber main amplifier is used for carrying out power amplification on the second linearly polarized laser to generate tunable pulse linearly polarized pump laser.
3. The tunable optical parametric oscillator of claim 2, wherein the seed fiber laser is a ring cavity structure;
the seed optical fiber laser comprises a first semiconductor laser pumping source, a first beam combiner, a first polarization-preserving gain optical fiber, a tunable optical fiber filter, a first optical fiber isolator, an optical fiber coupler and an optical fiber acousto-optic modulator;
the first semiconductor laser pumping source is used for providing first pumping light for the seed optical fiber laser;
the first beam combiner is used for coupling the first pump light and the first linearly polarized laser which is not coupled out into the first polarization-preserving gain fiber;
the first polarization-preserving gain fiber is used for converting the energy of the first pump light into the energy of the first linearly polarized laser light;
the tunable optical fiber filter is used for tuning the wavelength of the first linearly polarized laser;
the first optical fiber isolator is used for controlling the transmission direction of the first linearly polarized laser;
the optical fiber coupler is used for coupling part of the first linear polarization laser and outputting the coupled laser as seed laser;
the optical fiber acousto-optic modulator is used for modulating the first linear polarization laser to form pulse laser.
4. The tunable optical parametric oscillator of claim 2, wherein the fiber preamplifier comprises a second semiconductor laser pump source, a second beam combiner, a second polarization maintaining gain fiber, and a second fiber isolator;
the second semiconductor laser pumping source is used for providing second pumping light for the optical fiber preamplifier;
the second beam combiner is used for coupling the second pump light and the first linear polarization laser output by the optical fiber coupler into the second polarization-maintaining gain optical fiber;
the second polarization maintaining gain fiber is used for converting the energy of the second pump light into the energy of the second linearly polarized laser and amplifying the laser power output by the seed laser.
5. The tunable optical parametric oscillator of claim 4, wherein the power of the second semiconductor laser pump source is greater than the power of the first semiconductor laser pump source.
6. The tunable optical parametric oscillator of claim 4, wherein the fiber main amplifier comprises a third semiconductor laser pump source, a third beam combiner, a third polarization maintaining gain fiber, and a fiber collimator;
the third semiconductor laser pump source is used for providing third pump light for the optical fiber positive amplifier;
the third beam combiner is used for coupling the third pump light and the second linearly polarized laser light into the third polarization-maintaining gain fiber;
the third polarization-maintaining gain fiber is used for converting the energy of the third pump light into the energy of the tunable pulse linear polarization pump laser and amplifying the laser power output by the fiber preamplifier;
the optical fiber collimator is used for collimating the tunable pulse linear polarization pump laser output by the optical fiber main amplifier.
7. The tunable optical parametric oscillator of claim 6, wherein the power of the third semiconductor laser pump source is greater than the power of the second semiconductor laser pump source.
8. A tunable optical parametric oscillator according to claim 1, wherein the pump optical coupling arrangement comprises a spatial optical isolator, a half-wave plate and a beam-shrinking mirror; the beam reducing mirror group comprises a convex lens and a concave lens.
9. A tunable optical parametric oscillator according to claim 1, wherein the resonator cavity mirror comprises a front cavity mirror and an output mirror;
the front cavity mirror transmits the tunable pulse linear polarization pump laser to the nonlinear crystal, and the tunable pulse linear polarization pump laser is reflected back to the nonlinear crystal through the output mirror, the signal light oscillates between the front cavity mirror and the output mirror and repeatedly passes through the nonlinear crystal, and the idle frequency light is generated along with the signal light and is output from the output mirror and the signal light in the same path.
10. The tunable optical parametric oscillator of claim 9, wherein the nonlinear crystal is a periodically poled crystal;
the front cavity mirror is plated with a first optical film, and the first optical film is highly transparent to the tunable pulse linear polarization pump laser, highly reflective to the signal light and highly reflective to the idler frequency light; the transmittance of the first optical film to the tunable pulse linear polarization pump laser is greater than 95%, the reflectivity of the first optical film to the signal light is greater than 95%, and the reflectivity of the first optical film to the idler light is greater than 95%;
the output mirror is plated with a second optical film, and the second optical film is used for reflecting the tunable pulse linear polarization pump laser, partially reflecting the signal light and transmitting the idler frequency light; the reflectivity of the second optical film to the tunable pulse linear polarization pump laser is larger than 95%, the reflectivity of the second optical film to the signal light is 70%, and the transmissivity of the second optical film to the idler frequency light is larger than 95%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210363705.4A CN114784607A (en) | 2022-04-08 | 2022-04-08 | Tunable optical parametric oscillator |
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| CN115377786A (en) * | 2022-10-27 | 2022-11-22 | 武汉中科锐择光电科技有限公司 | System and method for improving laser pulse time domain contrast |
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| CN115377786A (en) * | 2022-10-27 | 2022-11-22 | 武汉中科锐择光电科技有限公司 | System and method for improving laser pulse time domain contrast |
| CN115377786B (en) * | 2022-10-27 | 2023-02-14 | 武汉中科锐择光电科技有限公司 | System and method for improving laser pulse time domain contrast |
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