CN108321669A - A kind of frequency multiplication light path module and the double-frequency laser system including the module - Google Patents
A kind of frequency multiplication light path module and the double-frequency laser system including the module Download PDFInfo
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- CN108321669A CN108321669A CN201810306395.6A CN201810306395A CN108321669A CN 108321669 A CN108321669 A CN 108321669A CN 201810306395 A CN201810306395 A CN 201810306395A CN 108321669 A CN108321669 A CN 108321669A
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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
- H01S3/0813—Configuration of resonator
- H01S3/0816—Configuration of resonator having 4 reflectors, e.g. Z-shaped resonators
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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
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06712—Polarising fibre; Polariser
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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
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
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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
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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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
- H01S3/109—Frequency multiplication, e.g. harmonic generation
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- Optics & Photonics (AREA)
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a kind of frequency multiplication light path module and the double-frequency laser system including the module, including the second optical fiber, collimator lens FC, set the thin metal gasket of thickness, first hysteroscope CM1, second hysteroscope CM2, third hysteroscope CM3, 4th hysteroscope CM4, periodic polarized crystal under set temperature environment, the first hysteroscope CM1, second hysteroscope CM2, third hysteroscope CM3, 4th hysteroscope CM4 forms the dish-like chamber that light path is transmitted in hysteroscope medial surface, the periodic polarized crystal is arranged in the light path between third hysteroscope CM3 and the 4th hysteroscope CM4, on the end face for the output end that the thin metal gasket one side is attached to the second optical fiber.The advantages of invention, is：Lens group and dish-like chamber progress pattern match can be replaced by setting the setting of the thin metal gasket of thickness, and the device used in this way is few, is easily integrated.
Description
Technical field
The present invention relates to laser technology, nonlinear optical physical technology field and Atomic Physics technical fields, especially a kind of
Frequency multiplication light path module and double-frequency laser system including the module.
Background technology
In double-frequency laser system, through being realized to frequency multiplication and light path frequently with various light path components and electronic component
Adjustment.For example, under the premise of assurance function, product is improved as possible so that product minimizes, often product improvement is chased after
The target asked.
Reduce parts be product miniaturization pass through frequently with technical solution because reduction parts one side not only may be used
So that structure is more simple and compact, and cost can also be further reduced.Therefore, how on the basis of reducing parts
Realize that preferable technical functionality becomes those skilled in the art's technical problem urgently to be resolved hurrily.
Invention content
In order to overcome the above-mentioned prior art, for this purpose, the present invention provides a kind of frequency multiplication light path module and times including the module
Frequency laser system.
To achieve the above object, the present invention uses following technical scheme：
A kind of frequency multiplication light path module, including the second optical fiber, collimator lens FC, the thin metal gasket for setting thickness, first
Periodic polarized crystal under hysteroscope CM1, the second hysteroscope CM2, third hysteroscope CM3, the 4th hysteroscope CM4, set temperature environment, institute
It states the first hysteroscope CM1, the second hysteroscope CM2, third hysteroscope CM3, the 4th hysteroscope CM4 and forms the dish that light path is transmitted in hysteroscope medial surface
Cavity, the periodic polarized crystal are arranged in the light path between third hysteroscope CM3 and the 4th hysteroscope CM4；The thin metal
Gasket one side is attached on the end face of the output end of the second optical fiber, the spacing between opposite another side and collimator lens FC
For focusing distance f, center and the collimator lens FC spacing of the first hysteroscope CM1 and the second hysteroscope CM2 lines are L12, described
Second optical fiber transmission light path successively after excessively thin metal gasket and collimator lens FC from the first hysteroscope CM1 backwards to dish-like chamber
Face passes through the first hysteroscope CM1, then in turn through the second hysteroscope CM2 towards the medial surface back reflection in the middle part of dish-like chamber to third chamber
Mirror CM3 towards in the middle part of dish-like chamber medial surface then be reflected into the 4th hysteroscope CM4 towards the medial surface in the middle part of dish-like chamber, frequency multiplication
Light beam passes through the 4th hysteroscope CM4 to be exported from from the lateral surface in the middle part of dish-like chamber.
Optimization, in the light path between the collimator lens FC and the first hysteroscope CM1 along the light path direction of the launch also according to
Secondary the first speculum M1 and the second speculum M2 being provided with for adjusting light path.
Optimization, the 4th hysteroscope CM4 is provided with dichroic mirror DM on output light path at the lateral surface in the middle part of dish-like chamber.
Optimization, second optical fiber is polarization maintaining optical fibre PMF.
Optimization, the periodic polarized crystal is PPLN.
Optimization, the periodic polarized crystal is arranged in temperature controlling stove, and the temperature range of the temperature controlling stove is 15-120
℃。
Optimization, the first hysteroscope CM1 and the second hysteroscope CM2 are average chamber, the third hysteroscope CM3 and the 4th hysteroscope
It is the flat-concave cavity of concave surface that CM4, which is towards the medial surface in the middle part of dish-like chamber,；Outsides of the first hysteroscope CM1 in the middle part of dish-like chamber
Face is coated with the anti-reflection film of setting wavelength, the reflectance coating that it is T to the transmissivity of the wavelength that medial surface, which is coated with,；Second hysteroscope CM2 towards
Medial surface in the middle part of dish-like chamber is coated with the film that is all-trans of the wavelength；The third hysteroscope CM3 and the 4th concave surfaces hysteroscope CM4 are that setting is bent
Rate, third hysteroscope CM3 are coated with the film that is all-trans of the wavelength in curved surface towards the medial surface in the middle part of dish-like chamber, the 4th hysteroscope CM4 towards
Medial surface in the middle part of dish-like chamber is coated with the film that the wavelength is all-trans, half-wave grows tall, and the lateral surface in the middle part of dish-like chamber is coated with half
The anti-reflection film of wavelength；Periodic polarized crystal outer surface is coated with the wavelength and double anti-reflection films of half-wavelength, dish-like chamber it is best
The coefficient of coup isWherein PcIt is dish-like cavity circulation power, L is other than inputting dish-like chamber
Intracavitary linear impairments；Γ is non-linear transfer coefficient, wherein Γ=ENL+Eabs；ENLIt is the frequency multiplication in the case of once-through
Coefficient, EabsFor non-linear conversion absorption coefficient.
In various element；
The q parameter of second fiber-optic output endface is q0=iZ0=i π w02/λ；First hysteroscope CM1 and the second hysteroscope CM2
Q parameter be q1=iZ1=i π w12/λ；W0 is the core diameter of the second fiber end face, and w1 is the first hysteroscope CM1 and the of dish-like intracavitary
Waist radius size between two hysteroscope CM2, i are imaginary unit, and λ is the setting wavelength of frequency multiplication, Z0And Z1For Ruili distance；
The center of first hysteroscope CM1 and the second hysteroscope CM2 lines to collimator lens FC be setpoint distance L12, L12Meet
Formula
It can be expressed as in one week total matrix of cavity circulationR is third hysteroscope CM3's and the 4th hysteroscope CM4 in formula
Radius of curvature, LcFor the length of crystal, l1For the distance of third hysteroscope CM3 and the 4th hysteroscope CM4, remaining chamber distance between mirrors is l,
Distance l subtracts the distance between third hysteroscope CM3 and the 4th hysteroscope CM4 equal to one week total length of cavity circulation, and n is periodical pole
Change the refractive index of crystal, A2、B2、C2、D2For the various element in propogator matrix；Meeting condition | A2+D2|<2, third hysteroscope CM3
And the 4th waist radius size between hysteroscope CM4 is
A kind of double-frequency laser system including above-mentioned frequency multiplication light path module further includes laser, the first optical fiber, optical fiber electricity
Optical modulator EOM, EDFA Erbium-Doped Fiber Amplifier EDFA, servo circuit, quick coupling PD, piezoelectric ceramics PZT, the laser pass through
First optical fiber is connect with the input terminal of fiber electro-optic modulator EOM, and the fiber electro-optic modulator EOM includes connecting with servo circuit
The first output end connect and the second output terminal being connect with EDFA Erbium-Doped Fiber Amplifier EDFA input terminals, the EDFA Erbium-Doped Fiber Amplifier
The output end of EDFA is connect with the input terminal of the second optical fiber, and lateral surfaces of the first hysteroscope CM1 in the middle part of dish-like chamber passes through
One input terminal of quick coupling PD and servo circuit connects, and the output end of the servo circuit is connect with piezoelectric ceramics PZT, described
Piezoelectric ceramics is arranged on the lateral surface of the second hysteroscope CM2.
Optimization, the servo circuit includes local oscillator LO, frequency mixer M, the low-pass filter LP set gradually, ratio
Example integral-derivative controller PID, high-voltage amplifier HV, the first output end and the local oscillator LO of fiber electro-optic modulator EOM
Connection, the local oscillator LO and quick coupling PD are connect with the input terminal of frequency mixer M respectively, and the low-pass filter LP is set
Set the output end in frequency mixer M.
The advantage of the invention is that：
(1) in the invention, other lens group and dish-like chamber can be replaced by setting the setting of the thin metal gasket of thickness
Pattern match is carried out, the device used in this way is few, is easily integrated.
(2) for the alignment of light path, when directly adjusting the angle of collimator lens FC, the angle for rotating very little may be inclined
Difference is larger, and the setting of the first speculum M1 and the second speculum M2 can reduce the first chamber of collimator lens FC and dish-like intracavitary
The difficulty of the optical path adjusting of mirror CM1.
(3) dichroic mirror DM is set at the lens combination light path output of dish-like chamber, so that the fundamental frequency light of double-frequency laser and leakage
Separation.
(4) powerful narrow linewidth laser is generated there are mainly two types of mode at present, and one is swashed using cavity semiconductor
Light pipe adds taper image intensifer, and this structure can generate the laser of high-power narrow line width, however semiconductor laser radiation
Facular model poor quality out, if with Single-Mode Fiber Coupling, coupling efficiency only up to reach near 60%, therefore
It needs first can just use pattern progress shaping in Atomic Physics experiment and nonlinear optics experiment.This just brings very to experiment
Big is not convenient.When using single mode optical fiber, need that four for controlling phase are added in the subsequent optical path of collimator lens FC
/ mono- wave plate QWP and half-wave plate HWP, and the present invention uses polarization maintaining optical fibre PWF, you can save quarter-wave plate QWP and half
Wave plate HWP, this also reduces the numbers of parts.The pattern exported by polarization maintaining optical fibre makes the pumping laser quality of output remote
Higher than the quality of the pump light exported by semiconductor TA amplifiers so that the pattern match efficiency exports laser than semiconductor TA
Pattern match efficiency it is much higher.
(5) periodic polarized PPLN crystal beams are along the optical axis of crystal, the light come out without walk-off effect, frequency multiplication
Beam, mould field quality are high.The once-through frequency-doubling conversion efficiency of periodic polarized crystal is high simultaneously, reaches needed for best shg efficiency
The pump power wanted can be relatively low, greatly reduces the requirement to pump laser power.
(6) since the frequency-doubled wavelength of periodic polarized PPLN crystal has a certain range of tunable characteristic, work as pumping wave
When length changes, the phase-matching temperatures for changing periodic polarized PPLN crystal by temperature controlling stove can be under new wavelength in fact
Now best frequency multiplication output, the tuning range of pumping wavelength is generally in 10nm or so, when needing larger range of adjustable range,
The crystal with other polarization cycles can be replaced, chirp polarized crystal can also be used to realize that large-scale tunable wave length is special
Property.
(7) present invention by the filming parameter of each hysteroscope meets impedance matching, by adjusting between component distance or portion
Part attribute meets pattern match, to realizing the Best Coupling coefficient of entire light path module, realizes stable frequency multiplication output.
(8) this system realizes the locking of dish-like chamber by PDH lock-in techniques, and this lock chamber robustness is good, dynamic range
Greatly, dish-like chamber is locked on the formant of pump light.
Description of the drawings
Fig. 1 is the structural schematic diagram of double-frequency laser system in the present invention；
Fig. 2 is that the present invention coordinates the matched frequency multiplication light path module of implementation pattern using thin metal gasket and the quasi- finger of optical fiber
Principle schematic；
Fig. 3 is the servo circuit principle schematic in double-frequency laser system of the present invention；
Fig. 4 is frequency-doubling crystal temperature curve schematic diagram in the embodiment of the present invention；
Fig. 5 is the reflection schematic diagram of dish-like chamber in the embodiment of the present invention；
Fig. 6 is frequency multiplication luminous power in the embodiment of the present invention with the schematic diagram of the variation of pump power.
The meaning of label symbol is as follows in figure：
The thin metal gasket 5- temperature controlling stoves of 1- lasers 2- the first optical fiber the second optical fiber of 3- 4-
6- periodic polarized crystal 7- servo circuits
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing
Step ground detailed description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
This programme is by taking wavelength X is the frequency multiplication light path module of 780nm as an example.
As shown in Figs. 1-2, a kind of frequency multiplication light path module, including the second optical fiber 3, collimator lens FC, setting thickness are thin
Week under metal gasket 4, the first hysteroscope CM1, the second hysteroscope CM2, third hysteroscope CM3, the 4th hysteroscope CM4, set temperature environment
Phase property polarized crystal 6, the periodic polarized crystal 6 are arranged in temperature controlling stove 5, and the temperature range of the temperature controlling stove 5 is 15-
120 DEG C, temperature-controlled precision 2mK.Second optical fiber 3 is polarization maintaining optical fibre PMF.The periodic polarized crystal 6 is PPLN.Described
One hysteroscope CM1, the second hysteroscope CM2, third hysteroscope CM3, the 4th hysteroscope CM4 formation light path are transmitted dish-like in hysteroscope medial surface
Chamber, the periodic polarized crystal 6 are arranged in the light path between third hysteroscope CM3 and the 4th hysteroscope CM4.The thin metal gasket
4 one side of piece is attached on the end face of the output end of the second optical fiber 3, the spacing between opposite another side and collimator lens FC
For focusing distance f, the center of the first hysteroscope CM1 and the second hysteroscope CM2 lines to collimator lens FC spacing is L12, described
Second optical fiber 3 transmission light path successively after excessively thin metal gasket 4 and collimator lens FC from the first hysteroscope CM1 backwards to dish-like chamber
Face pass through the first hysteroscope CM1, then in turn through the second hysteroscope CM2 towards the medial surface back reflection in the middle part of dish-like chamber to third
Hysteroscope CM3 towards in the middle part of dish-like chamber medial surface then be reflected into the 4th hysteroscope CM4 towards the medial surface in the middle part of dish-like chamber, times
Frequency light beam passes through the 4th hysteroscope CM4 to be exported from from the lateral surface in the middle part of dish-like chamber, and the 4th hysteroscope CM4 is in the middle part of dish-like chamber
Lateral surface at be provided with dichroic mirror DM on output light path.
It is also disposed with along the light path direction of the launch in light path between the collimator lens FC and the first hysteroscope CM1
The first speculum M1 and the second speculum M2 for adjusting light path.First speculum M1 and the second speculum M2 is 1560nm
Total reflective mirror.
The first hysteroscope CM1 and the second hysteroscope CM2 is average chamber, and the third hysteroscope CM3 and the 4th hysteroscope CM4 are face
Medial surface in the middle part of to dish-like chamber is the flat-concave cavity of concave surface；Lateral surfaces of the first hysteroscope CM1 in the middle part of dish-like chamber is coated with
The anti-reflection film of 1560nm, the reflectance coating that it is T to the transmissivity of 1560nm that medial surface, which is coated with,；Second hysteroscope CM2 is towards in dish-like chamber
The medial surface in portion is coated with the film that is all-trans of 1560nm；The third hysteroscope CM3 and the 4th concave surfaces hysteroscope CM4 are setting curvature, curvature
Radius is 80mm, and third hysteroscope CM3 is coated with the film that is all-trans of 1560nm, the 4th hysteroscope in curved surface towards the medial surface in the middle part of dish-like chamber
CM4 is coated with the film that 1560nm is all-trans, 780nm high is saturating towards the medial surface in the middle part of dish-like chamber, the lateral surface in the middle part of dish-like chamber
It is coated with the anti-reflection film of 780nm；6 outer surface of periodic polarized crystal is coated with double anti-reflection films of 1560nm and 780nm.Periodical pole
Change 6 length of crystal is 20mm, and the distance between third hysteroscope CM3 and the 4th hysteroscope CM4 is 108mm, and the distance l between other hysteroscopes is
260mm.W with a tight waist between third hysteroscope CM3 and the 4th hysteroscope CM42Size is 66 μm, selects 4 thickness of thin metal gasket in this way
So that focusing distance f, which is 450mm, can be realized best pattern match.
Double-frequency laser system including above-mentioned frequency multiplication light path module further includes laser 1, the first optical fiber 2, fiber electro-optic tune
Device EOM processed, EDFA Erbium-Doped Fiber Amplifier EDFA, servo circuit 7, quick coupling PD, piezoelectric ceramics PZT, the laser 1 pass through
One optical fiber 2 is connect with the input terminal of fiber electro-optic modulator EOM, and the fiber electro-optic modulator EOM includes connecting with servo circuit 7
The first output end connect and the second output terminal being connect with EDFA Erbium-Doped Fiber Amplifier EDFA input terminals, the EDFA Erbium-Doped Fiber Amplifier
The output end of EDFA is connect with the input terminal of the second optical fiber 3, and lateral surfaces of the first hysteroscope CM1 in the middle part of dish-like chamber passes through
Quick coupling PD is connect with an input terminal of servo circuit 7, and the output end of the servo circuit 7 is connect with piezoelectric ceramics PZT, institute
Piezoelectric ceramics is stated to be arranged on the lateral surface of the second hysteroscope CM2.Wherein the first optical fiber 2 is also polarization maintaining optical fibre.
As shown in figure 3, the servo circuit 7 includes local oscillator LO, frequency mixer M, the low-pass filter set gradually
LP, proportional plus integral plus derivative controller PID, high-voltage amplifier HV, the first output end and local oscillation of fiber electro-optic modulator EOM
Device LO connections, the local oscillator LO and quick coupling PD are connect with the input terminal of frequency mixer M respectively, the low-pass filter
The output end in frequency mixer M is arranged in LP.
Herein by taking the double-frequency laser system of 780nm as an example, wherein laser 1 generates the seed laser of 1560nm, by the
After one optical fiber 2 enters the EOM modulation of fiber electro-optic modulator, output is as frequency multiplication after the EDFA amplifications of input EDFA Erbium-Doped Fiber Amplifier
Pumping laser.Laser of the pumping laser after the second optical fiber 3, collimator lens focusing is coupled into dish through speculum M1 and M2
In cavity；Then frequency multiplication output is carried out by periodic polarized crystal 6.
Quickly probe PD is used to monitor the reflection spectrum signal of butterfly-type chamber, and believes with the modulation of fiber electro-optic modulator EOM
The error signal for locking chamber is generated number after frequency mixer M, low-pass filter LP, error signal is through PID control parameter
For controlling piezoelectric ceramics PZT after device PID, high-voltage amplifier HV amplifications, for the locking of dish-like chamber.When dish-like chamber is in
Lock-out state, and when crystal temperature effect is in phase-matching condition, double-frequency laser output is just will produce, double-frequency laser passes through double-colored
Mirror DM is detached with the fundamental frequency light of leakage.
In order to realize the extra cavity frequency-doubled laser output for realizing high efficiency and height mode quality with compact highly integrated light path
Purpose, design includes the following steps.
(1) design completed determines the geometric dimension implementation pattern matching of butterfly chamber.
The end face of second optical fiber, 3 output end is to the optical path Center point between the first hysteroscope CM1 and the second hysteroscope CM2
Spread fiber matrix is expressed asF is the poly- of collimator lens FC in formula
Defocus distance, x are the thickness of thin metal gasket 4, and X is 0.2mm, A in this embodiment1、B1、C1、D1For the set of data in propogator matrix
Element；
The q parameter of second optical fiber, 3 output end endface is q0=iZ0=i π w02/λ；First hysteroscope CM1 and the second hysteroscope
The q parameter of CM2 is q1=iZ1=i π w12/λ；W0 is the core diameter of 3 end face of the second optical fiber, and w1 is the first hysteroscope CM1 of dish-like intracavitary
And the second waist radius size between hysteroscope CM2, i are imaginary unit, λ is the setting wavelength of frequency multiplication, Z0And Z1For Ruili distance；
The center of collimator lens FC to the first hysteroscope CM1 and the second hysteroscope CM2 lines is setpoint distance L12Coincidence formulaIn this embodiment, L12Value is 475mm.
From 6 center of periodic polarized crystal, can be expressed as in one week total abcd matrix of cavity circulationR is third hysteroscope CM3's and the 4th hysteroscope CM4 in formula
Radius of curvature, LcFor the length of crystal, l1For the distance of third hysteroscope CM3 and the 4th hysteroscope CM4, l is remaining chamber distance between mirrors,
Distance l subtracts the distance between third hysteroscope CM3 and the 4th hysteroscope CM4 equal to one week total length of cavity circulation, and n is periodical pole
Change the refractive index of crystal 6, A2、B2、C2、D2For the various element in propogator matrix；
Meeting condition | A2+D2|<2, the waist radius size between third hysteroscope CM3 and the 4th hysteroscope CM4 isThe present invention selects | A+D | the situation of ≈ 0, at this moment the stability of dish-like chamber is best.
(2) it determines the filming parameter of each hysteroscope, realizes the impedance matching of frequency multiplication light path module.
(3) the best coefficient of coup is obtained
The Best Coupling coefficient of dish-like chamber isWherein PcIt is dish-like cavity circulation work(
Rate, L are the linear impairments of the intracavitary other than input coupling hysteroscope；Γ is non-linear transfer coefficient, wherein Γ=ENL+Eabs；
ENLIt is the Clock Multiplier Factor in the case of once-through, EabsFor non-linear conversion absorption coefficient.Corresponding double frequency power isThe frequency doubled light of generation is by the part of absorption of crystal
In present example, efficient frequency multiplication output in order to obtain, the phase of the non-linear PPLN crystal of determination first
Position matching temperature, by measuring once-through double frequency power variation with temperature curve, it may be determined that the phase matched temperature of crystal
Degree, for the temperature curve for the crystal in this example as shown in figure 4, best match temperature is 99 degrees Celsius, temperature bandwidth is 5
Degree.In order to characterize the parameter of butterfly chamber, we are firstly the need of the pattern match efficiency for seeing dish-like chamber.Pattern match efficiency can be from
The reflectance spectrum of dish-like chamber can calculate, and the ratio with the recess ratio of reflectance spectrum and the recess ratio of ideal situation is exactly mould
Formula matching efficiency, reflectance spectrum are as shown in Figure 5.Carrying out the matched efficiency of implementation pattern by using the thickness of thin metal gasket 4 can be with
Reach 90% or so, effect is ideal.The use that lens group can be reduced in this way, makes light channel structure greatly simplify.
To obtain stable frequency multiplication output, need the lock for stablizing dish-like chamber in the resonant position of dish-like chamber, the present invention
Example locks chamber technology using ripe PDH, is loaded on fiber electro-optic modulator EOM using radio frequency source, gives one sideband of light field
It modulates, after the light field after sideband modulation is mixed low pass after dish-like cavity reflection is arrived by quick probe detection with the radiofrequency signal of modulation
The error signal of lock chamber is generated, error signal controls piezoelectric ceramics for locking chamber after the processing amplification of servo circuit 7.It is dish-like
Stable frequency multiplication output can be formed after chamber locking.
The final step of frequency multiplication light path module design is characterization, shg efficiency and input power and the input cavity of dish-like chamber
The relationship of the mirror coefficient of coup.There is one most preferably for given pump power it can be seen from Best Coupling coefficient formula
The coefficient of coup, the coefficient of coup depend on nonlinear loss caused by the linear impairments and frequency multiplication of intracavitary.Pump power is higher, coupling
It is bigger to close coefficient T.In service life polarized crystal 6, even if pump power is relatively low, turning for optimization can also be realized
Change efficiency.Fig. 6 is in present example, and the pump power and transfer efficiency at coefficient of coup T=4.5% are with pump power
Relationship.Frequency multiplication internal conversion efficiency reaches as high as being more than 75%, and peak power is up to 430mW.
The preferred embodiment that these are only the invention is not intended to limit the invention creation, all in the present invention
All any modification, equivalent and improvement etc., should be included in the guarantor of the invention made by within the spirit and principle of creation
Within the scope of shield.
Claims (10)
1. a kind of frequency multiplication light path module, which is characterized in that including the second optical fiber (3), collimator lens FC, the thin gold for setting thickness
Belong to the week under gasket (4), the first hysteroscope CM1, the second hysteroscope CM2, third hysteroscope CM3, the 4th hysteroscope CM4, set temperature environment
Phase property polarized crystal (6), the first hysteroscope CM1, the second hysteroscope CM2, third hysteroscope CM3, the 4th hysteroscope CM4 form light path and exist
The dish-like chamber that hysteroscope medial surface transmits, the periodic polarized crystal (6) setting third hysteroscope CM3 and the 4th hysteroscope CM4 it
Between light path on；On the end face for the output end that thin metal gasket (4) one side is attached to the second optical fiber (3), opposite is another
Spacing between side and collimator lens FC is in focusing distance f, the first hysteroscope CM1 and the second hysteroscope CM2 lines
The heart is L with collimator lens FC spacing12, the light path of the second optical fiber (3) transmission is successively through excessively thin metal gasket (4) and collimation
The first hysteroscope CM1 is passed through from the first hysteroscope CM1 backwards to the face of dish-like chamber after device lens FC, then in turn through the second hysteroscope CM2
Towards the medial surface back reflection in the middle part of dish-like chamber to third hysteroscope CM3 towards in the middle part of dish-like chamber medial surface then be reflected into
Four hysteroscope CM4 pass through the 4th hysteroscope CM4 from the outside in the middle part of dish-like chamber towards the medial surface in the middle part of dish-like chamber, frequency multiplication light beam
It is exported at face.
2. a kind of frequency multiplication light path module according to claim 1, which is characterized in that the collimator lens FC and the first chamber
The the first speculum M1 and second for being useful for adjustment light path is also set gradually in light path between mirror CM1 along the light path direction of the launch
Speculum M2.
3. a kind of frequency multiplication light path module according to claim 1, which is characterized in that the 4th hysteroscope CM4 is in dish-like chamber
Dichroic mirror DM is provided at the lateral surface in portion on output light path.
4. a kind of frequency multiplication light path module according to claim 1, which is characterized in that second optical fiber (3) is polarization-maintaining light
Fine PMF.
5. a kind of frequency multiplication light path module according to claim 1, which is characterized in that the periodic polarized crystal (6) is
PPLN。
6. a kind of frequency multiplication light path module according to claim 1, which is characterized in that the periodic polarized crystal (6) sets
It sets in temperature controlling stove (5), the temperature range of the temperature controlling stove (5) is 15-120 DEG C.
7. a kind of frequency multiplication light path module according to claim 1, which is characterized in that the first hysteroscope CM1 and the second chamber
Mirror CM2 is average chamber, and it is the flat of concave surface that the third hysteroscope CM3 and the 4th hysteroscope CM4, which are towards the medial surface in the middle part of dish-like chamber,
Cavity；Lateral surfaces of the first hysteroscope CM1 in the middle part of dish-like chamber is coated with the anti-reflection film of setting wavelength, and medial surface is coated with to this
The transmissivity of wavelength is the reflectance coating of T；Second hysteroscope CM2 is coated with the film that is all-trans of the wavelength towards the medial surface in the middle part of dish-like chamber；
The third hysteroscope CM3 and the 4th concave surfaces hysteroscope CM4 are setting curvature, and third hysteroscope CM3 is in the middle part of curved surface is towards dish-like chamber
Medial surface is coated with the film that is all-trans of the wavelength, the 4th hysteroscope CM4 towards the medial surface in the middle part of dish-like chamber be coated with the wavelength be all-trans, half-wave
The film to grow tall, the lateral surface in the middle part of dish-like chamber are coated with the anti-reflection film of half-wavelength；Periodic polarized crystal (6) outer surface is equal
It is coated with the wavelength and double anti-reflection films of half-wavelength, the Best Coupling coefficient of dish-like chamber isIts
Middle PcIt is dish-like cavity circulation power, L is the linear impairments of the intracavitary other than inputting dish-like chamber；Γ is non-linear transfer system
Number, wherein Γ=ENL+Eabs；ENLIt is the Clock Multiplier Factor in the case of once-through, EabsFor non-linear conversion absorption coefficient.
8. a kind of frequency multiplication light path module according to claim 7, which is characterized in that the second optical fiber (3) output end
The spread fiber matrix of end face to the optical path Center point between the first hysteroscope CM1 and the second hysteroscope CM2 is expressed asF is the focusing distance of collimator lens FC in formula, and x is thin metal gasket
The thickness of piece (4), A1、B1、C1、D1For the various element in propogator matrix；
The q parameter of the second optical fiber (3) output end endface is q0=iZ0=i π w02/λ；First hysteroscope CM1 and the second hysteroscope CM2
Q parameter be q1=iZ1=i π w12/λ；W0 is the core diameter of the second optical fiber (3) end face, and w1 is the first hysteroscope CM1 of dish-like intracavitary
And the second waist radius size between hysteroscope CM2, i are imaginary unit, λ is the setting wavelength of frequency multiplication, Z0And Z1For Ruili distance；
The center of first hysteroscope CM1 and the second hysteroscope CM2 lines to collimator lens FC be setpoint distance L12, L12Coincidence formula
It can be expressed as in one week total matrix of cavity circulation
, r is the radius of curvature of third hysteroscope CM3 and the 4th hysteroscope CM4, L in formulacFor the length of crystal, l1For third hysteroscope CM3 and
The distance of four hysteroscope CM4, remaining chamber distance between mirrors are l, and distance l subtracts third hysteroscope equal to one week total length of cavity circulation
Distance between CM3 and the 4th hysteroscope CM4, n are the refractive index of periodic polarized crystal (6), A2、B2、C2、D2For in propogator matrix
Various element；Meeting condition | A2+D2| ＜ 2, the waist radius size between third hysteroscope CM3 and the 4th hysteroscope CM4 are
9. a kind of double-frequency laser system including the frequency multiplication light path module described in claim 1-8 any one, which is characterized in that
Further include laser (1), the first optical fiber (2), fiber electro-optic modulator EOM, EDFA Erbium-Doped Fiber Amplifier EDFA, servo circuit (7),
Quick coupling PD, piezoelectric ceramics PZT, the input that the laser (1) passes through the first optical fiber (2) and fiber electro-optic modulator EOM
End connection, the fiber electro-optic modulator EOM include the first output end being connect with servo circuit (7) and amplify with erbium-doped fiber
The second output terminal of device EDFA input terminals connection, the output end of the EDFA Erbium-Doped Fiber Amplifier EDFA are defeated with the second optical fiber (3)
Enter end connection, lateral surfaces of the first hysteroscope CM1 in the middle part of dish-like chamber passes through quick coupling PD and the one of servo circuit (7)
Input terminal connects, and the output end of the servo circuit (7) is connect with piezoelectric ceramics PZT, and the piezoelectric ceramics is arranged in the second chamber
On the lateral surface of mirror CM2.
10. a kind of double-frequency laser system according to claim 9, which is characterized in that the servo circuit (7) includes the machine
Oscillator LO, frequency mixer M, the low-pass filter LP set gradually, proportional plus integral plus derivative controller PID, high-voltage amplifier HV, light
The first output end of fine electrooptic modulator EOM is connect with local oscillator LO, PD points of the local oscillator LO and quick coupling
It is not connect with the input terminal of frequency mixer M, the output end in frequency mixer M is arranged in the low-pass filter LP.
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| CN109239009A (en) * | 2018-09-03 | 2019-01-18 | 杭州电子科技大学 | Gaseous mercury concentration detection apparatus and method based on ring resonator frequency multiplication structure |
| CN109768464A (en) * | 2019-03-15 | 2019-05-17 | 中国科学院物理研究所 | A kind of low-noise high efficiency deep ultraviolet continuous wave laser |
| CN111900598A (en) * | 2020-07-28 | 2020-11-06 | 中国科学院半导体研究所 | Laser emitting device |
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| CN109768464A (en) * | 2019-03-15 | 2019-05-17 | 中国科学院物理研究所 | A kind of low-noise high efficiency deep ultraviolet continuous wave laser |
| CN109768464B (en) * | 2019-03-15 | 2023-06-20 | 中国科学院物理研究所 | Low-noise high-efficiency deep ultraviolet continuous laser |
| CN111900598A (en) * | 2020-07-28 | 2020-11-06 | 中国科学院半导体研究所 | Laser emitting device |
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