CN208707068U - A kind of power proportions and pulse spacing adjustable dual wavelength light parametric oscillator - Google Patents
A kind of power proportions and pulse spacing adjustable dual wavelength light parametric oscillator Download PDFInfo
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- CN208707068U CN208707068U CN201821342766.8U CN201821342766U CN208707068U CN 208707068 U CN208707068 U CN 208707068U CN 201821342766 U CN201821342766 U CN 201821342766U CN 208707068 U CN208707068 U CN 208707068U
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Abstract
The utility model discloses a kind of power proportions and pulse spacing adjustable dual wavelength light parametric oscillators, the utility model utilizes two pieces of laser gain mediums and one block of nonlinear crystal using coaxial pumping configuration, the operating of dual wavelength signal light is realized in double pumping action source of the dual wavelength fundamental frequency light generated by two pieces of laser gain mediums as nonlinear crystal.The power proportions and pulse interval that neatly adjust dual-wavelength laser may be implemented in the position of laser gain medium or change pump wavelength by changing pump light focus point, and the tuning that the temperature, angle or polarization cycle for controlling nonlinear crystal realize wavelength can be passed through.The utility model is not only simple in structure compact, tuning convenience, and low in cost.
Description
Technical field
The utility model relates to solid state laser and nonlinear optical frequency conversion fields, and in particular to a kind of power proportions
And pulse spacing adjustable dual wavelength light parametric oscillator.
Background technique
The dual-wavelength laser generated using optical parametric oscillator is in accurate measurement, spectrum analysis, remote sensing and non-linear
The Applied research fields such as frequency transformation have similar in great scientific research value and wide application prospect, especially wavelength
Tunable dual-wavelength laser can be used for converting generating terahertz wave band coherent source under difference frequency, be in laser technology field
One important research direction.
Method currently used for generating dual-wavelength laser output mainly has:
1. generating dual-wavelength laser respectively as optical parameter using two pieces of laser gain mediums in composite laser carity to shake
The double wave pumping source in device is swung, realizes the output of dual wavelength signal light.However for composite laser carity, need to insert in the laser
Enter Amici prism and multiple reflecting mirrors to give positive feedback respectively to the fundamental frequency light of two different wave lengths, though the method be able to achieve it is double
The tuning in wavelength power ratio and pulse spacing, but its structure is complex, higher cost.
2. being realized using the nonlinear crystal of two pieces of variety classes of Single wavelength fundamental frequency optical pumping or different cutting angles double
The output of wavelength signals light cannot tune dual wavelength power proportions and pulse although this mode structure is simple, cost is relatively low
It is spaced (P.Liu, et al, Appl.Phys.Lett.108 (1), 011104 (2016)).
3. passing through the double resonance outputting dual wavelength laser of signal light and ideler frequency light, this mode using optical parametric oscillator
It can only generally be realized at nearly degeneracy point, and can not achieve tuning (J.Mei, the et in dual wavelength power proportions and pulse spacing
Al, Opt.Express 24 (20), 23368-23375 (2016)).
4. using the combination level structure of single laser gain medium while output dual wavelength fundamental frequency light is as optical parameter
Double wave pumping source in oscillator realizes the output of dual wavelength signal light.But this method is since that there are gains is competing for two fundamental frequency lights
It strives, causes the dual wavelength signal photostability of output poor, and can not achieve the tuning in dual wavelength power proportions and pulse spacing
(M.Wang, et al, Journal of Physics D:Appl.Phys.49 (6), 065101 (2015)).
And following shortcoming and defect exists in the prior art: the power proportions of dual wavelength signal light and pulse spacing are non-adjustable
Humorous, dual wavelength fundamental frequency light gain competition leads to the dual wavelength signal photo-labile exported or apparatus structure complexity and higher cost
Deng.
Utility model content
The purpose of this utility model is to overcome deficiency in the prior art, a kind of power proportions and pulse spacing are provided
Adjustable dual wavelength light parametric oscillator, the utility model utilize two pieces of laser gain mediums and one piece using coaxial pumping configuration
Nonlinear crystal, double pumping action source of the dual wavelength fundamental frequency light generated by two pieces of laser gain mediums as nonlinear crystal are real
Existing dual wavelength signal light operating.It can in the position of laser gain medium or change pump wavelength by changing pump light focus point
To realize the power proportions and pulse interval that neatly adjust dual-wavelength laser, and can be by controlling nonlinear crystal
Temperature, angle or polarization cycle realize the tuning of wavelength.The utility model is not only simple in structure compact, tuning convenience, and
It is low in cost.
The purpose of this utility model is achieved through the following technical solutions:
A kind of power proportions and pulse spacing adjustable dual wavelength light parametric oscillator, including set gradually pumping source,
Pumping coupling system, cavity mirror, first laser gain media, second laser gain media, Q-switching device, dual wavelength swash
Light total reflective mirror, nonlinear crystal and dual-wavelength laser outgoing mirror；
Under the feedback effect for the fundamental frequency optical cavity that the cavity mirror and dual-wavelength laser outgoing mirror are constituted, two
The coaxial and adjacent first laser gain media of block, second laser gain media generate dual wavelength fundamental frequency light；In dual-wavelength laser
The optical parametric oscillator effect that total reflective mirror and dual-wavelength laser outgoing mirror are constituted is lower to be converted to fundamental frequency light by nonlinear crystal
The signal light of its all band, and exported via dual-wavelength laser outgoing mirror part；
The pump light that pumping source issues is by pumping coupling system to first laser gain media, second laser gain media
It is pumped, it is anti-that the activation particle absorption pump light in first laser gain media and second laser gain media generates population
Turn, the feedback through resonant cavity generates the light generation of dual wavelength fundamental frequency after Q-switching device opening；Before changing pumping coupling system
Position adjusts position of the pump light focus point in first laser gain media, second laser gain media afterwards, so that first swashs
Pump light volume in optical gain medium, second laser gain media changes, and first laser gain media, second is caused to swash
Inverted population density changes in optical gain medium；Or the temperature by adjusting pumping source changes pump wavelength, leads
The pumping light power for causing first laser gain media, second laser gain media to absorb changes, so that first laser gain
Inverted population density changes in medium, second laser gain media；First laser gain media, second laser gain are situated between
When the photon density of dual wavelength fundamental frequency light and pulse are established in the variation influence fundamental frequency optical cavity of inverted population density in matter
Between；While dual wavelength fundamental frequency light generation, the photon density of the dual wavelength signal light in optical parametric oscillator and pulse are established
Time changes, and realizes that the power proportions of the dual wavelength signal light of dual-wavelength laser outgoing mirror output and pulse interval can
It adjusts.
Further, the first laser gain media and second laser gain media are by two pieces of different types of laser
Crystal or two pieces of laser crystal compositions with type but different cut direction, it is anti-reflection that the laser crystal both ends of the surface are coated with pump light
Film and fundamental frequency light anti-reflection film.
Further, the Q-switching device is A-O Q-switch device or electric-optically Q-switched device, and Q-switching device both ends are coated with fundamental frequency light
Anti-reflection film operates for realizing the pulse of fundamental frequency light, improves non-linear turn of optical parameter process by improving peak power
Change efficiency.
Further, meet collinear phase matching condition in the nonlinear crystal, and output wavelength is adjustable, pass through control
Temperature, angle or the polarization cycle of nonlinear crystal change the wavelength of output signal wave, the wavelength tuning of realization.Linear crystal plating
There are fundamental frequency light anti-reflection film and signal light anti-reflection film.
Further, the eyeglass of the cavity mirror is plane mirror or plano-concave mirror, is coated with fundamental frequency light and is all-trans film and pump
Pu light anti-reflection film.
Further, the dual-wavelength laser total reflective mirror is concave mirror or flat mirror, is coated with fundamental frequency light anti-reflection film and signal light is high
Anti- film；
Further, the dual-wavelength laser outgoing mirror is concave mirror or flat mirror, is coated with signal light part through film.
Compared with prior art, beneficial effect brought by the technical solution of the utility model is:
The utility model dual wavelength light parametric oscillator uses coaxial pumping configuration, utilizes two pieces of laser gain mediums and one
Block nonlinear crystal, double pumping action source of the dual wavelength fundamental frequency light generated by two pieces of laser gain mediums as nonlinear crystal,
Realize the operating of dual wavelength signal light, it can by adjusting position or pump wavelength of the pump light focus point in laser gain medium
Realize the dual wavelength signal light power ratio and double-wavelength pulse time interval for neatly controlling output, and can be non-thread by changing
Property crystal operating temperature, angle or polarization cycle tuning operation signal light wavelength without change mechanical structure, solve existing skill
Dual-wavelength laser power proportions and double-wavelength pulse interval are untunable present in art, structure is complicated, and system stability is poor
The problem of, there is significant application value in accurate measurement, spectrum analysis and nonlinear frequency transformation.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model dual wavelength light parametric oscillator.
Appended drawing reference: 1- pumping source, 2- pumping coupling system, 3- cavity mirror, 4- first laser gain media, 5-
Second laser gain media, 6- Q-switching device, 7- dual-wavelength laser total reflective mirror, 8- nonlinear crystal, 9- dual-wavelength laser outgoing mirror
Specific embodiment
It is practical new to this below in conjunction with attached drawing to keep the purpose of this utility model, technical solution and advantage clearer
Type embodiment is described in further detail.
As shown in Figure 1, dual wavelength light parametric oscillator includes the pumping source 1 set gradually, pumping coupling system 2, resonance
It is resonant reflec-tors 3, first laser gain media 4, second laser gain media 5, Q-switching device 6, dual-wavelength laser total reflective mirror 7, non-thread
Property crystal 8 and dual-wavelength laser outgoing mirror 9, pumping source 1 is the semiconductor laser of fiber coupling output, exports the center of laser
Wavelength is 805nm, and the core diameter of optical fiber is 400 microns, and numerical aperture 0.22, the laser that pumping source 1 exports is led through energy-transmission optic fibre
Enter pumping coupling system 2.Pumping coupling system 2 is the coupled lens group of 1:2, can focus pump light and be incident on first laser
In gain media 4 and second laser gain media 5.First laser gain media 4 is Nd:YAG crystal, Nd3+Doping concentration is
0.6%, crystalline size is 4mm × 4mm × 7mm, and second laser gain media 5 is the Nd:YLF crystal cut along a axis, Nd3+It mixes
Miscellaneous concentration be 1%, crystalline size be 3mm × 3mm × 10mm, two pieces of laser gain medium both ends of the surface be coated with 800nm or so and
The anti-reflection film of 1050nm or so.Fundamental frequency optical cavity is made of cavity mirror 3 and dual-wavelength laser outgoing mirror 9, resonant cavity
Reflecting mirror 3 is plano-concave mirror, and concave curvature radius is 500mm, and eyeglass concave surface is coated with the high-reflecting film near 1050nm, pumping source 1 one
The mirror surface of side is coated with the high transmittance film near 800nm.The acousto-optic medium of Q-switching device 6 is fused quartz, medium length 35mm, ultrasound
Wave working frequency is 41MHz, driving power 20W, q-frequency 6kHz.Optical parametric oscillator is by dual-wavelength laser total reflective mirror 7
Constituted with dual-wavelength laser outgoing mirror 9, dual-wavelength laser total reflective mirror 7 is average mirror, be coated with anti-reflection film near 1050nm and
1500~1550nm high-reflecting film.Dual-wavelength laser outgoing mirror 9 is average mirror, the high-reflecting film being coated near 1050nm and 1500~
The part 1550nm reflectance coating, the transmitance T=20% of 1500~1550nm signal light, above-mentioned hysteroscope lens substrate is K9 glass
Material.Nonlinear crystal 8 is the KTA crystal cut along X-axis, and crystalline size is 4mm × 4mm × 20mm, and both ends of the surface are coated with
1050nm nearby and 1500~1550nm anti-reflection film.
First laser gain media 4Nd:YAG and second laser gain media 5Nd:YLF absorbs pump light, activates particle
Energy state is stored in pump energy in upper laser level by ground state transition to excitation state, when Q-switching device 6 is in close state
When, upper energy level population constantly accumulates and generates a large amount of inverted populations, when Q-switching device 6 is opened, meets laser generation item
Part realizes that rapidly violent stimulated radiation is amplified by the feedback of resonant cavity, giant-pulse fundamental frequency light generation is established in resonant cavity,
The wavelength of basic frequency laser is 1064nm and 1047nm, and pulse recurrence frequency consistent with q-frequency is 6kHz.Meanwhile by non-thread
The fundamental frequency light of the frequency conversion of property crystal 8KTA, 1064nm and 1047nm generate parametric oscillation under the action of optical parametric oscillator
Effect, it is defeated by the human eye safe waveband of fundamental frequency light frequency transformation to 1535nm and 1506nm, then via dual-wavelength laser outgoing mirror
The dual-wavelength laser of 1535nm and 1506nm out.
Activation particle absorption pumping in first laser gain media 4Nd:YAG and second laser gain media 5Nd:YLF
Light generates population inversion, and the front-rear position by changing 1:2 coupled lens in pumping coupling system 2 adjusts pump light focus point
Position in first laser gain media 4, second laser gain media 5 can make first laser gain media 4, second
Pump light volume in laser gain medium 5 changes, and leads to first laser gain media 4, in second laser gain media 5
Inverted population density changes, or the temperature by adjusting pumping source 1 changes pump wavelength, so that first laser increases
Beneficial medium 4, second laser gain media 5 absorption coefficient change, cause first laser gain media 4, second laser increase
The pumping light power that beneficial medium 5 absorbs changes, so that reversion in first laser gain media 4, second laser gain media 5
Population density changes.The variation of inverted population density in first laser gain media 4, second laser gain media 5
It is bis- to will affect 1064nm and 1047nm in the fundamental frequency optical cavity being made of cavity mirror 3 and dual-wavelength laser outgoing mirror 9
The photon density and pulse build-up time of wavelength fundamental frequency light.Simultaneously as nonlinear crystal 8KTA have nonlinear effect, by
The lower parametric oscillation that passes through of the optical parametric oscillator effect that dual-wavelength laser total reflective mirror 7 and dual-wavelength laser outgoing mirror 9 form is by base
Frequency laser is converted to the signal light of its all band, leads to 1535nm the and 1506nm dual wavelength signal light in optical parametric oscillator
Photon density and pulse build-up time change, realize change the 1535nm that export through dual-wavelength laser outgoing mirror 9 with
The power proportions and pulse interval of 1506nm dual-wavelength laser.
To sum up, power proportions provided by the embodiment of the utility model and pulse spacing adjustable dual wavelength light parametric oscillation
Device utilizes two pieces of laser gain mediums and one block of nonlinear crystal using coaxial pumping configuration, passes through two pieces of laser gain mediums
The operating of dual wavelength signal light is realized in double pumping action source of the dual wavelength fundamental frequency light of generation as nonlinear crystal.It is pumped by adjusting
Position or pump wavelength of the light focus point in laser gain medium can neatly control the power of dual-wavelength laser when arteries and veins
Punching interval, and output wavelength can be adjusted without changing mechanical structure, surely by changing crystal operating temperature, angle or polarization cycle
Qualitative good, solving the power of dual-wavelength laser existing in the prior art, when the pulse spacing is untunable, structure is complicated, system
The poor problem of stability.
In the utility model embodiment, the kind of laser gain medium, nonlinear crystal can be selected according to actual needs
Class, doping concentration or size and the curvature of cavity mirror, dual-wavelength laser total reflective mirror and dual-wavelength laser outgoing mirror half
Diameter, plated film wave band and transmitance.
To the model of each device in addition to doing specified otherwise, the model of other devices does not limit the utility model embodiment
System, as long as the device of above-mentioned function can be completed.
The utility model is not limited to embodiments described above.Above the description of specific embodiment is intended to describe
With illustrate the technical solution of the utility model, the above mentioned embodiment is only schematical, is not restrictive.?
In the case of not departing from the utility model aims and scope of the claimed protection, those skilled in the art are practical at this
The specific transformation of many forms can be also made under novel enlightenment, these are belonged within the protection scope of the utility model.
Claims (8)
1. a kind of power proportions and pulse spacing adjustable dual wavelength light parametric oscillator, which is characterized in that including setting gradually
Pumping source (1), pumping coupling system (2), cavity mirror (3), first laser gain media (4), second laser gain
Medium (5), Q-switching device (6), dual-wavelength laser total reflective mirror (7), nonlinear crystal (8) and dual-wavelength laser outgoing mirror (9)；
Under the feedback effect for the fundamental frequency optical cavity that the cavity mirror (3) and dual-wavelength laser outgoing mirror (9) are constituted,
Two pieces of coaxial and adjacent first laser gain medias (4), second laser gain media (5) generate dual wavelength fundamental frequency light；Double
Pass through nonlinear crystal under the optical parametric oscillator effect that wavelength laser total reflective mirror (7) and dual-wavelength laser outgoing mirror (9) are constituted
(8) fundamental frequency light is converted to the signal light of its all band, and is exported via dual-wavelength laser outgoing mirror (9) part；
The pump light that pumping source (1) issues increases first laser gain media (4), second laser by pumping coupling system (2)
Beneficial medium (5) is pumped, the activation particle absorption pump in first laser gain media (4) and second laser gain media (5)
Pu light generates population inversion, and the feedback through resonant cavity generates the light generation of dual wavelength fundamental frequency after Q-switching device (6) are opened；Pass through
The front-rear position for changing pumping coupling system (2) adjusts pump light focus point and increases in first laser gain media (4), second laser
Position in beneficial medium (5), so that the pump light volume in first laser gain media (4), second laser gain media (5) is sent out
Changing causes first laser gain media (4), second laser gain media (5) interior inverted population density to change；Or
Person changes pump wavelength by adjusting the temperature of pumping source (1), leads to first laser gain media (4), second laser gain
The pumping light power that medium (5) absorbs changes, so that in first laser gain media (4), second laser gain media (5)
Inverted population density changes；First laser gain media (4), second laser gain media (5) interior inverted population are close
The variation of degree influences the photon density and pulse build-up time of dual wavelength fundamental frequency light in fundamental frequency optical cavity；In dual wavelength fundamental frequency light
While oscillation, the photon density and pulse build-up time of the dual wavelength signal light in optical parametric oscillator change, and realize
The power proportions and pulse interval of the dual wavelength signal light of dual-wavelength laser outgoing mirror (9) output are adjustable.
2. a kind of power proportions according to claim 1 and pulse spacing adjustable dual wavelength light parametric oscillator, special
Sign is that the first laser gain media (4) and second laser gain media (5) are by two blocks of different types of laser crystals
Or two pieces with the laser crystal of type but different cut direction composition, the laser crystal both ends of the surface be coated with pump light anti-reflection film and
Fundamental frequency light anti-reflection film.
3. a kind of power proportions according to claim 1 and pulse spacing adjustable dual wavelength light parametric oscillator, special
Sign is that the Q-switching device (6) is A-O Q-switch device or electric-optically Q-switched device, and it is anti-reflection that Q-switching device (6) both ends are coated with fundamental frequency light
Film operates for realizing the pulse of fundamental frequency light, and the non-linear conversion that optical parameter process is improved by improving peak power is imitated
Rate.
4. a kind of power proportions according to claim 1 and pulse spacing adjustable dual wavelength light parametric oscillator, special
Sign is, meets collinear phase matching condition in the nonlinear crystal (8), and output wavelength is adjustable, non-linear by controlling
Temperature, angle or the polarization cycle of crystal change the wavelength of output signal wave, the wavelength tuning of realization.
5. a kind of power proportions according to claim 1 and pulse spacing adjustable dual wavelength light parametric oscillator, special
Sign is, the eyeglass of the cavity mirror (3) is plane mirror or plano-concave mirror, be coated with fundamental frequency light be all-trans film and pump light it is anti-reflection
Film.
6. a kind of power proportions according to claim 1 or 4 and pulse spacing adjustable dual wavelength light parametric oscillator,
It is characterized in that, the nonlinear crystal (8) is coated with fundamental frequency light anti-reflection film and signal light anti-reflection film.
7. a kind of power proportions according to claim 1 and pulse spacing adjustable dual wavelength light parametric oscillator, special
Sign is that the dual-wavelength laser total reflective mirror (7) is concave mirror or flat mirror, is coated with fundamental frequency light anti-reflection film and signal light high-reflecting film.
8. a kind of power proportions according to claim 1 and pulse spacing adjustable dual wavelength light parametric oscillator, special
Sign is that the dual-wavelength laser outgoing mirror (9) is concave mirror or flat mirror, is coated with signal light part through film.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110797750A (en) * | 2019-09-27 | 2020-02-14 | 中国科学院电子学研究所 | Optical parametric oscillator for outputting dual-wavelength mid-infrared light |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110797750A (en) * | 2019-09-27 | 2020-02-14 | 中国科学院电子学研究所 | Optical parametric oscillator for outputting dual-wavelength mid-infrared light |
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