CN106711745B - Infrared parametric oscillator in broad tuning, narrow linewidth nanosecond pulse double resonance - Google Patents
Infrared parametric oscillator in broad tuning, narrow linewidth nanosecond pulse double resonance Download PDFInfo
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- CN106711745B CN106711745B CN201710105513.2A CN201710105513A CN106711745B CN 106711745 B CN106711745 B CN 106711745B CN 201710105513 A CN201710105513 A CN 201710105513A CN 106711745 B CN106711745 B CN 106711745B
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/0602—Crystal lasers or glass lasers
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08059—Constructional details of the reflector, e.g. shape
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
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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
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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
- H01S3/10084—Frequency control by seeding
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
A kind of double resonance, broad tuning, all solid state nanosecond pulse mid-infrared light parametric oscillator of narrow linewidth, device includes: single-frequency pump light, four part of double resonance resonant cavity, electricity control section and seed light, using 1.064 μm of pure-tone pulse laser pumping quasi-phase matched multicycle polarized crystal double resonant optical parameter oscillators, obtain broad tuning range near infrared signal light, in infrared idle light the output of two waveband laser；Output center wavelength can tune in wide spectral range, long by electro-optic crystal dynamic regulation chamber in conjunction with single-frequency continuous semiconductor laser injection seeded technology, realize the narrow-linewidth laser output of optical parametric oscillator.It the composite can be widely applied to the fields such as high-resolution laser spectroscopy, laser radar, laser remote sensing, environment detection, photoelectronic warfare, laser medicine.
Description
Technical field
The present invention relates to a kind of optical device more particularly to the nanosecond pulse double resonance mid-infrared lights of broad tuning, narrow linewidth
Learn parametric oscillator.The output of broad tuning range laser is realized by temperature, period, angle tuning, it is real by double resonance annular chamber
Existing two waveband oscillation realizes narrow-linewidth laser output in conjunction with injection seeded technology.Suitable for laser spectroscopy, laser radar, swash
The fields such as light remote sensing, environmental pollution detection, photodetection, laser medicine.
Background technique
Near-infrared and in it is infrared be very important atmospheric window in optical region.Near infrared band is not only laser pair
The safest wave band of human eye, and it is in propagation in atmosphere window, it is strong to the penetration capacity of smog, it thus can develop high-precision survey
Wind, radar etc. carry out weather forecast and global climate detection；Middle infrared band is to atmospheric transmittance height, by gas molecules sorb
It is small with the influence of suspended matter scattering, and many polluted gas (SO2、CO2、NO2、NH4、NH3Deng) have in middle infrared band it is strong
Absorption peak, therefore the wave band laser ranging, laser radar, laser remote sensing, it is highly sensitive in terms of there is weight
It applies.
Optical parametric oscillator is the current generation most common method of mid-infrared laser, still, it is contemplated that crystal and film
The damage threshold of system, traditional optical parametric oscillator reflection line width is usually several nanometers, continuous operation mode, poor signal to noise,
Detectivity is poor, it is difficult to meet the need in the fields such as spectroscopy, laser remote sensing, the environment detection relatively high for linewidth requirements
It asks.
Doubly resonant oscillator meets signal light simultaneously with idle light generation, it can be achieved that ultraviolet to 12 μm of far infrared of broad tuning
The output of range laser, and do not limited by pump wavelength.
Quasi-phase matching can utilize the nonlinear factor of crystal to greatest extent, using various ways tuning, rise
Shake threshold value it is low, without walk-off effect, it is compact-sized, can be achieved room temperature running, the matching of preferential direction can make energy constantly from
Fundamental frequency light is converted to parameteric light.
The periodic polarized crystal (MgO:PPLN, MgO:PPLT) for mixing magnesia is that a kind of efficient wavelength convert is non-
Linear crystal has transparency range wide (0.4~4.5 μm), long service life, and effective nonlinear coefficient is high, Low threshold, high efficiency
The characteristics of, it is to generate near-infrared-mid-infrared laser wave band important materials, compared with MgO:PPLN, MgO:PPLT has higher
The coefficient of heat conduction.By to multicycle polarized crystal carry out temperature, the period, angle tuning, it can be achieved that broad tuning dual wavelength
Output.
Conventional seed injection laser system is long using the chamber of piezoelectric ceramics control laser, but due to piezoelectric ceramics
Nonlinear characteristic and oscillation often lead to laser output single-frequency characteristic and are deteriorated.
Summary of the invention
The purpose of the present invention is to provide a kind of miniaturization, broad tuning, all solid state nanosecond pulse mid-infrared lights of narrow linewidth
Parametric oscillator solves the key technology difficulties such as pulse optical parametric oscillator linewidth narrowing, frequency tuning and spectrum control, can
To inject any resonance single-frequency seed light, realize near infrared signal light, in the spectrum of infrared idle light two waveband narrow, before
Scape is bright.
Technical solution of the invention is as follows:
Infrared parametric oscillator in broad tuning, narrow linewidth nanosecond pulse double resonance is characterized in that the oscillator includes: single-frequency
Pump light, four part of double resonance resonant cavity, electricity control section and seed light；
The pumping optical path includes 1.064 μm of pumping sources, condenser lens, 1.064 μ being mounted on rotatable bracket
M half-wave plate and polarizing film；
The double resonance resonant cavity includes the first hysteroscope of plano-concave, the multicycle being fixed on crystal temperature controlling stove polarization crystalline substance
Body, the second hysteroscope of plano-concave, plane third hysteroscope, the 4th hysteroscope of plane and spectroscope, the multicycle polarized crystal and crystal
Temperature controlling stove is fixed on together on four-dimensional adjustment frame, for adjusting period and the angle of multicycle polarized crystal；In plane third chamber
The intermediate of the 4th hysteroscope of mirror and plane is inserted into electro-optic crystal, and the extended line of the two is equipped with photodiode；
The electricity control processing section includes photodiode, electro-optic crystal, electro-optic crystal driving source and electric light tune
Device and PID control system processed are constituted.The output end of electro-optic crystal driving source is connected with the input terminal of electro-optic crystal, described
The input terminal of PID control system be connected respectively with the output end of the photodiode output end, electrooptic modulator, it is described
The output end of PID control system be connected with the input terminal of the electro-optic crystal driving source.
The seed light includes single-frequency FPB seed laser, collimation lens, isolator, half-wave plate, condenser lens and half
Saturating semi-reflective mirror, the collimation lens, half-wave plate and condenser lens are coated with to the high saturating deielectric-coating of seed light, semi-transparent semi-reflecting lens
Transmitted light path be equipped with electrooptic modulator.
Along pumping optical path propagation path are as follows: 1.064 μm of pumping sources issue pump light by condenser lens coupling focus after,
Successively after 1.064 μm of half-wave plates, polarizing film and dichroic mirrors, then from the transmission of the first hysteroscope of plano-concave, it is brilliant to be incident on multicycle polarization
The center of body, by four-dimensional adjustment frame adjust multicycle polarized crystal position and angle, generate near infrared signal light and
In infrared idle light, residual pump light transmits away from the second hysteroscope of plano-concave.The polarizing film and pumping optical path in cloth scholar this
Special angle is placed, and the polarizing film and 1.064 μm of half-wave plates constitute light intensity adjusting device, for adjusting the light of incident pump light
By force；
Along seed optical path propagation path are as follows: single-frequency FPB seed laser issue seed laser successively pass through collimation lens,
It is coupled to pumping optical path after isolator, half-wave plate, condenser lens, semi-transparent semi-reflecting lens and dichroic mirror, and then penetrates the first chamber of plano-concave
Mirror, using after multicycle polarized crystal with 15 ° of degree incident angles to the second hysteroscope of plano-concave, after successively pass through the second chamber of plano-concave
Mirror, plane third hysteroscope, the total reflection effect of the 4th hysteroscope of plane are reflected back the first hysteroscope of plano-concave, and plano-concave is incident on after reflection
Seed laser a part of one hysteroscope is directed through the first hysteroscope of plano-concave and spectroscope directly exports, and another part is by plano-concave the
One hysteroscope is reflected back incident seed light road, and oscillation closed circuit is formed in annular chamber.The condenser lens is used for seed
Optically coupling to the center of multicycle polarized crystal, the dichroic mirror is coated with saturating to 1.064 μm of height, and 45 ° of height of seed light are anti-
Deielectric-coating, the spectroscope be coated with it is high near infrared signal light thoroughly, the high anti-deielectric-coating of the infrared idle light of centering.
Within the duty cycle, electrooptic modulator is carried out to by the seed light of semi-transparent semi-reflecting lens for the electricity control section
Frequency, amplitude modulation, the photodiode receive near infrared signal light and transmit the interference to be formed by plane third hysteroscope
Signal generates error signal with the signal mixing after electrooptic modulator, and the error signal is by PID control system
Reason, the output driving electro-optic crystal driving source of PID control system drive electric light brilliant by adjusting electro-optic crystal driving source voltage
Body, adjusting cavity is long, is locked in the signal light frequency of optical parametric oscillator in seed laser frequency, and it is defeated to obtain narrow-linewidth laser
Out.The electro-optic crystal is gallium arsenide, and the photodiode is in-Ga-As photoelectric detector.
The isolator is not less than 20dB to the isolation of seed laser, convenient for effectively being protected to seed laser
Shield.
The temperature control range of the crystal temperature controlling stove is 20~200 DEG C, and temperature-controlled precision is ± 0.1 DEG C.
The invention has the following advantages that
1,1.064 μm of laser pump (ing) multicycle polarized crystals based on the output of pure-tone pulse laser, pass through period, angle
Degree, thermal tuning can obtain tunable double resonance near-infrared-mid-infrared laser output, have and tune convenient, coverage area
Wide advantage；
2, ring cavity structure of the invention is conducive to the stable oscillation stationary vibration and seed laser injection of zlasing mode, dual resonant cavity energy
Enough realize the infrared idle light double resonance single-frequency parameter laser output in of near infrared signal light.
3, the present invention is using the main frequency control technology control semiconductor seed laser frequency characteristic passively combined, in turn
It is injected into optical resonator, by electro-optic crystal, the resonant cavity of optical parametric oscillator is locked in the frequency of seed laser
On, the characteristics of realizing the line width for narrowing optical parameter light, improve the efficiency of optical parameter conversion.
Detailed description of the invention
Fig. 1 is that broad tuning of the present invention, the structure of narrow linewidth nanosecond pulse double resonance mid-infrared laser oscillator embodiment are shown
It is intended to.
Fig. 2 is electricity control processing line graph.
Specific embodiment
To further illustrate particular technique content of the invention, with reference to embodiments and attached drawing detailed description are as follows:
With initial reference to Fig. 1, Fig. 1 be broad tuning of the present invention, in narrow linewidth nanosecond pulse double resonance infrared parametric oscillator knot
Structure schematic diagram, the present invention include four parts: single-frequency pump light, double resonance resonant cavity, electricity control section and seed light:
The single-frequency pump light includes 1.064 μm of pumping source 1-1, condenser lens 1-2, is mounted on rotatable bracket
1.064 μm of half-wave plate 1-3, polarizing film 1-4 and dichroic mirror 1-5；
The double resonance resonant cavity includes the first hysteroscope of plano-concave 2-1, the multicycle pole being fixed on crystal temperature controlling stove 2-3
Change crystal 2-2, the second hysteroscope of plano-concave 2-4, plane third hysteroscope 2-5, plane the 4th hysteroscope 2-6 and spectroscope 2-7, described is more
Periodical poled crystal 2-2 is fixed on four-dimensional adjustment frame together with crystal temperature controlling stove 2-3, for adjusting multicycle polarized crystal 2-
2 period and angle；Intermediate in the 4th hysteroscope 2-6 of plane third hysteroscope 2-5 and plane is inserted into electro-optic crystal 3-2, the two
Extended line is equipped with photodiode 3-1；
The seed light include single-frequency FPB seed laser 4-1, collimation lens 4-2, isolator 4-3, half-wave plate 4-4,
The transmitted light path of condenser lens 4-5 and semi-transparent semi-reflecting lens 4-6, semi-transparent semi-reflecting lens 4-6 are equipped with electrooptic modulator 3-4.
Along pumping optical path propagation path are as follows: the pump light that 1.064 μm of pumping source 1-1 are issued is coupled by condenser lens 1-2
After focusing, successively after 1.064 μm of half-wave plate 1-3, polarizing film 1-4 and dichroic mirror 1-5, then from plano-concave the first hysteroscope 2-1 transmit,
It is incident on the center of multicycle polarized crystal 2-2, the position and angle of multicycle polarized crystal are adjusted by four-dimensional adjustment frame
Degree generates near infrared signal light infrared idle light, residual pump light in and transmits away from the second hysteroscope of plano-concave 2-3.Described
Polarizing film 1-4 and pumping optical path are placed in Brewster's angle, and the polarizing film 1-4 and 1.064 μm of half-wave plate 1-3 constitute light intensity
Regulating device, for adjusting the light intensity of incident pump light；
Along seed optical path propagation path are as follows: the seed laser that single-frequency FPB seed laser 4-1 is issued is successively saturating by collimation
It is coupled to pump light after mirror 4-2, isolator 4-3, half-wave plate 4-4, condenser lens 4-5, semi-transparent semi-reflecting lens 4-6 and dichroic mirror 1-5
Road, and then penetrate the first hysteroscope of plano-concave 2-1, using after multicycle polarized crystal 2-2 with 15 ° of degree incident angles to plano-concave the
Two hysteroscope 2-4, after successively by the second hysteroscope of plano-concave 2-4, plane third hysteroscope 2-5, the 4th hysteroscope 2-6 of plane total reflection make
With plano-concave the first hysteroscope 2-1 is reflected back, be incident on after reflection the first hysteroscope of plano-concave 2-1 seed laser a part be directed through it is flat
Recessed first hysteroscope 2-1 and spectroscope 2-7 are directly exported, and another part is reflected back incident seed light by the first hysteroscope of plano-concave 2-1
Road forms oscillation closed circuit in annular chamber.The condenser lens 4-5 is used to seed polarize optically coupling to the multicycle brilliant
The center of body 2-2, the dichroic mirror 1-5 is coated with, seed light 45 ° height anti-deielectric-coating saturating to 1.064 μm of height, described
Spectroscope 2-7 is coated with high near infrared signal light saturating, the high anti-deielectric-coating of the infrared idle light of centering.
The electricity control section is within the duty cycle, and electrooptic modulator 3-4 is to the seed for passing through semi-transparent semi-reflecting lens 4-6
Light carries out frequency, amplitude modulation, and it is saturating by plane third hysteroscope 2-5 that the photodiode 3-1 receives near infrared signal light
The interference signal to be formed is penetrated, generates error signal, the error signal with the seed photo-signal mixing after electrooptic modulator 3-4
Using the processing of PID control system 3-4, the output action of PID control system 3-4 passes through tune in electro-optic crystal driving source 3-3
The luminescent crystal driving source voltage that economizes on electricity drives electro-optic crystal 3-2, and adjusting cavity is long, makes the near infrared signal optical frequency of optical parametric oscillator
Rate is locked in seed laser frequency, obtains narrow linewidth near infrared signal light infrared idle light output in.The electric light is brilliant
Body 3-2 is gallium arsenide, and the photodiode 3-1 is in-Ga-As photoelectric detector.
1.064 μm of pumping source 1-1 are laser diode-pumped Nd:YAG Q-switched laser, and output wavelength is
1.064 μm, line width is close to the Fourier transformation limit.
The first hysteroscope of plano-concave 2-1 be coated with it is anti-reflection to 1.064 μm, near infrared signal light and in infrared idle light it is equal
Part penetrates and the identical deielectric-coating of transmitance；The second hysteroscope of plano-concave 2-4 be coated with it is anti-reflection to 1.064 μm, to near-infrared
Signal light and in the high anti-deielectric-coating of infrared idle light, the plane third hysteroscope 2-5, intracavitary reflective surface is coated with pair
1.064 μm of height are saturating, high near infrared signal light saturating, and the high anti-deielectric-coating of the infrared idle light of centering, another side is coated with to 1.064 μm
It is high saturating, the high-reflecting film of the infrared idle light of centering；The 4th hysteroscope 2-6 of plane is coated with the saturating, near infrared signal to 1.064 μm of height
The high anti-deielectric-coating of light infrared idle light in.
The multicycle polarized crystal 2-2, material are MgO:PPLN or MgO:PPLT, and polarization structure is the multicycle
Structure, polarization cycle are 29 μm, 29.5 μm, 30 μm, 30.5 μm, and equidistant to change, size 50mm*3mm*7mm, this is more
Two end faces of periodical poled crystal are coated with to 1.064 μm, near-infrared and the antireflective deielectric-coating of middle infrared band.For the side of tuning
Just, multicycle polarized crystal and crystal temperature controlling stove are fixed on together on a four-dimensional adjustment frame, convenient for carrying out period, angle to crystal
Degree and thermal tuning.
The single-frequency FPB seed laser 4-1 is to be locked by fine temperature and high-precision current frequency stabilization scheme
Single-frequency semiconductor seed laser.
The temperature control range of the crystal temperature controlling stove 2-3 is 20~200 DEG C, and temperature-controlled precision is ± 0.1 DEG C.
The collimation lens 4-2 and condenser lens 4-5 carries out light beam variation to seed laser, makes it in ring resonator
It is interior consistent with parametric reasonance light spot size, reach optimal pattern match.
The isolator 4-3 can guarantee the one-way transmission of seed laser, and surface optical device is avoided to reflect or from rear
The laser that hysteroscope leaks out enters seed laser and breaks seed laser, which is not less than the isolation of seed laser
20dB。
The specific embodiments of the present invention course of work, which is that 1.064 μm of Nd:YAG pump laser 1-1 output are unpolarized, to swash
Light passes through condenser lens 1-2, and focal point is coupled to multicycle polarized crystal at the center of multicycle polarized crystal 2-2
The pump spot diameter of 2-2 is 800 μm；Using the light intensity adjusting device that half-wave plate 1-3 and polarizing film 1-4 is formed, adjust
Section is incident on the pumping light intensity of ring resonator；The single-frequency laser that single-frequency FPB seed laser 4-1 is generated passes through collimation lens 4-
After 2 are collimated into collimated light beam, by isolator 4-3, then the center of multicycle polarized crystal 2-2 is focused on by condenser lens 4-5
Place, the seed spot diameter size for being coupled to multicycle polarized crystal is 600 μm, using dichroic mirror 1-5 and pumping optical path weight
It closes, it is intracavitary to be incident on double resonance annular.1.064 μm of pump lights carry out frequency transformation and vibration inside multicycle polarized crystal 2-2
Swing, by the frequency conversion of multicycle polarized crystal 2-2, near infrared signal light (1.3~1.7 μm) and in infrared idle light
(3.0~4.5 μm) are emitted in 30 ° of direction by plano-concave the first hysteroscope 2-1 along with incident pump light, and residual pump light is by plano-concave the
Two hysteroscope 2-4 outgoing；Infrared idle light and near infrared signal light are separated by light splitting piece 2-7 in output, signal light warp
It crosses fiber coupling and imports wavemeter, the specific resonance wavelength of output signal light is measured, by adjusting single-frequency DFB seed laser 4-
1 electric current and temperature parameter is controlled, and keeps its output wavelength center consistent with the central wavelength of signal light output of measurement.It is single
Frequency FPB seed laser 4-1 a part is injected into double resonance annular chamber, and a part carries out frequency, width by electrooptic modulator 3-4
Degree tuning, photodiode 3-2 is used to detect the signal optical signal through plane third hysteroscope, and is converted to electric signal, the electricity
Signal carries out being mixed into error signal with the signal after Electro-optical Modulation after bandpass filtering, amplification, and then the error is believed
Number by PID controller system 3-5 handle, the output driving electro-optic crystal driving source 3-3 of PID control system, electro-optic crystal drive
Dynamic source gives piezo-electric crystal 3-2 to apply voltage, the refractive index of electro-optic crystal linear change therewith, and then quickly adjusting cavity is long, so that
Output signal light frequency is locked in always in seed laser frequency, thus export narrow linewidth near infrared signal light and in infrared sky
Not busy light.
Experiment shows.The present invention is polarized by 1.064 μm of laser pump (ing) annular double resonance resonant cavities of single-frequency in conjunction with the multicycle
Crystal period, angle, thermal tuning realize the broad tuning model of signal light (1.3~1.7 μm) and idle light (3.0~4.5 μm)
Enclose laser output；Again by injecting identical with signal light frequency seed laser, it can be achieved that infrared idle light, near-infrared in single-frequency
Signal light output, has effectively narrowed line width, so that the laser spectrum width of output is less than 0.1nm, overcomes traditional optical parameter
Oscillator transmission line width is usually several nanometers, the technical problem of continuous operation mode, poor signal to noise, detectivity difference.This hair
It is bright to have the characteristics that broad tuning, double resonance, single-frequency are good.
Claims (6)
1. infrared parametric oscillator in a kind of broad tuning, narrow linewidth nanosecond pulse double resonance is characterized in that the oscillator includes: single
Frequency pump light, four part of double resonance resonant cavity, electricity control section and seed light；
The single-frequency pump light includes 1.064 μm of pumping sources (1-1), condenser lens (1-2), is mounted on rotatable bracket
1.064 μm of half-wave plates (1-3), polarizing film (1-4) and dichroic mirror (1-5)；
The multicycle pole that the double resonance resonant cavity includes the first hysteroscope of plano-concave (2-1), is fixed on crystal temperature controlling stove (2-3)
Change crystal (2-2), the second hysteroscope of plano-concave (2-4), plane third hysteroscope (2-5), the 4th hysteroscope (2-6) of plane and spectroscope (2-
7), the multicycle polarized crystal (2-2) and crystal temperature controlling stove (2-3) are fixed on together on four-dimensional adjustment frame, for adjusting
The period of multicycle polarized crystal (2-2) and angle；In the centre of the 4th hysteroscope (2-6) of plane third hysteroscope (2-5) and plane
It is inserted into electro-optic crystal (3-2), the extended line of the two is equipped with photodiode (3-1)；
The electricity control section include photodiode (3-1), electro-optic crystal (3-2), electro-optic crystal driving source (3-3) and
Electrooptic modulator (3-4) and PID control system (3-5), the output end and electro-optic crystal of the electro-optic crystal driving source (3-3)
The input terminal of (3-2) is connected, and the input terminal of the PID control system (3-5) is defeated with the photodiode (3-1) respectively
Outlet is connected with the output end of electrooptic modulator (3-4), the output end of the PID control system (3-5) and the electric light
The input terminal in crystal-driven source (3-3) is connected；
The seed light includes single-frequency FPB seed laser (4-1), along the kind of single-frequency FPB seed laser (4-1) sending
Collimation lens (4-2) that sub- laser direction is sequentially placed, isolator (4-3), half-wave plate (4-4), condenser lens (4-5) and semi-transparent
Semi-reflective mirror (4-6), the electrooptic modulator (3-4) are arranged on the transmitted light path of semi-transparent semi-reflecting lens (4-6)；
Along pumping optical path propagation path are as follows: the pump light that 1.064 μm of pumping sources (1-1) issue is coupled by condenser lens (1-2)
After focusing, successively after 1.064 μm of half-wave plates (1-3) and polarizing film (1-4), it is incident on dichroic mirror (1-5), through the dichroic mirror
The transmitted light of (1-5) is incident on the center of multicycle polarized crystal (2-2) after the first hysteroscope of plano-concave (2-1) transmission, leads to
Position and angle that four-dimensional adjustment frame adjusts multicycle polarized crystal (2-2) are crossed, near infrared signal light infrared free time in is generated
Light, residual pump light transmit away from the second hysteroscope of plano-concave (2-4)；The polarizing film (1-4) and pumping optical path in cloth scholar this
Special angle is placed, and the polarizing film (1-4) constitutes light intensity adjusting device with 1.064 μm of half-wave plates (1-3), for adjusting incident pump
The light intensity of Pu light；
Along seed optical path propagation path are as follows: the seed laser that single-frequency FPB seed laser (4-1) issues successively passes through collimation lens
After (4-2), isolator (4-3), half-wave plate (4-4) and condenser lens (4-5), it is incident on semi-transparent semi-reflecting lens (4-6), it is semi-transparent through this
Dichroic mirror (1-5) is injected after semi-reflective mirror (4-6) reflection, pumping optical path is coupled to by dichroic mirror (1-5), through the first chamber of plano-concave
Mirror (2-1), using after multicycle polarized crystal (2-2) with after 15 ° of degree incident angles to the second hysteroscope of plano-concave (2-4) successively
Total reflection effect by the second hysteroscope of plano-concave (2-4), plane third hysteroscope (2-5), the 4th hysteroscope (2-6) of plane is reflected back flat
Recessed first hysteroscope (2-1), which successively penetrates the first hysteroscope of plano-concave (2-1) and spectroscope (2-7) is directly defeated
Out, another part again passes by the first hysteroscope of plano-concave (2-1) and reflexes to multicycle polarized crystal (2-2), is formed in annular chamber
Vibrate closed circuit；The condenser lens (4-5) is used for seed optically coupling to the centre bit of multicycle polarized crystal (2-2)
It sets, the dichroic mirror (1-5) is coated with, seed light 45 ° height anti-deielectric-coating saturating to 1.064 μm of height, the spectroscope (2-7)
It is coated with high near infrared signal light saturating, the high anti-deielectric-coating of the infrared idle light of centering；
Within the duty cycle, electrooptic modulator (3-4) carries out frequency, amplitude tune to by the seed light of semi-transparent semi-reflecting lens (4-6)
System, the photodiode (3-1) receive the interference letter that near infrared signal light is formed by plane third hysteroscope (2-5) transmission
Number, error signal is generated with the signal mixing after electrooptic modulator (3-4), PID control system (3-5) receives error letter
Number and carry out processing of circuit to it, the output driving electro-optic crystal driving source (3-3) of PID control system (3-5) passes through and changes electricity
The voltage of luminescent crystal driving source (3-3) drives electro-optic crystal (3-2), and real-time dynamic regulation chamber is long, makes optical parametric oscillator
Near infrared signal light frequency is locked in seed laser frequency, and it is defeated to obtain narrow linewidth near infrared signal light infrared idle light in
Out.
2. infrared parametric oscillator in broad tuning as described in claim 1, narrow linewidth nanosecond pulse double resonance, it is characterised in that
1.064 μm of pumping sources (1-1) are the single-frequency laser of pulse operating, and output wavelength is 1.064 μm, the pump light of output
For non-polarized light, line width is close to the Fourier transformation limit.
3. infrared parametric oscillator in broad tuning as described in claim 1, narrow linewidth nanosecond pulse double resonance, it is characterised in that
First hysteroscope of plano-concave (2-1) be coated with it is anti-reflection to 1.064 μm, near infrared signal light and in infrared idle light part thoroughly
It crosses and the identical deielectric-coating of transmitance；Second hysteroscope of plano-concave (2-4) be coated with it is anti-reflection to 1.064 μm, near infrared signal
The high anti-deielectric-coating of light infrared idle light in, the plane third hysteroscope (2-5), intracavitary reflective surface are coated with to 1.064 μ
M high thoroughly, it is high near infrared signal light thoroughly, the high anti-deielectric-coating of the infrared idle light of centering, another side be coated with it is saturating to 1.064 μm of height,
The high-reflecting film of the infrared idle light of centering；The 4th hysteroscope (2-6) of plane is coated with saturating, the near infrared signal light to 1.064 μm of height
The high anti-deielectric-coating of infrared idle light in.
4. infrared parametric oscillator in broad tuning as described in claim 1, narrow linewidth nanosecond pulse double resonance, it is characterised in that
The single-frequency FPB seed laser (4-1) is the single frequency locked by fine temperature and high-precision current frequency stabilization scheme
Rate semiconductor seed laser.
5. infrared parametric oscillator in broad tuning as described in claim 1, narrow linewidth nanosecond pulse double resonance, feature exist
In the polarization structure of the multicycle polarized crystal (2-2) is multicycle structure, and polarization cycle is 29 μm, 29.5 μm, 30 μ
M, 30.5 μm, polarization cycle equidistantly changes, and two end faces of the multicycle polarized crystal are coated with to 1.064 μm, near-infrared letter
Number light and in the infrared antireflective deielectric-coating of idle light, the crystalline material of the multicycle polarized crystal is MgO:PPLN or MgO:
PPLT。
6. infrared parametric oscillator in broad tuning as described in claim 1, narrow linewidth nanosecond pulse double resonance, it is characterised in that
Near infrared signal light and in infrared idle light wavelength tuning mode be by change multicycle polarized crystal (2-2) temperature,
Angle the realization temperature, period, angle tuning for translating temperature control multicycle polarized crystal, adjusting multicycle polarized crystal.
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