CN107528197B - Two-chamber compound unsteady cavity modeling pumping from optical parametric oscillation mid-infrared laser device - Google Patents
Two-chamber compound unsteady cavity modeling pumping from optical parametric oscillation mid-infrared laser device Download PDFInfo
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Abstract
Two-chamber compound unsteady cavity modeling pumping from optical parametric oscillation mid-infrared laser device, be related to field of lasers, solve the problems, such as based on Nd:MgO:PPLN crystal from optical parameter mid-infrared laser device how to take into account high power and high beam quality fundamental frequency light self- pomped and from optical parametric oscillation process focusing parameter match.The present invention includes two laser diode pumping sources, two energy-transmission optic fibres, four condenser lenses, two 45 degree of beam splitters, optical parametric osoillator total reflective mirror, optical parametric osoillator outgoing mirror, Nd:MgO:PPLN crystal, temperature controller and acousto-optic Q-switching.By using fundamental frequency optical cavity and parameter light generation chamber two-chamber composite construction, two chambers are made to be kept completely separate work while taking into account integrated compactedness, it ensure that two chamber cavity structure parameter designings are not interfere with each other, it can be realized the optical pumping of large base module high light beam quality fundamental frequency, oscillation parameter light and fundamental frequency light focusing parameter matched, energy conversion efficiency is high.
Description
Technical field
The present invention relates to field of laser device technology, and in particular to a kind of compound unsteady cavity modeling pumping of two-chamber from optical parameter
Vibrate mid-infrared laser device.
Background technique
Infrared band laser covers the mostly important transmission window of atmosphere in 3~5 μm, this wave band of laser environmental protection,
The fields such as medical treatment, national defence suffer from huge application prospect, are an important branch of laser technology research.Optical parametric oscillation
(OPO) as expand laser output wavelength one of important nonlinear frequency transformation technology, in recent years, based on phosphorus germanium zinc (ZGP),
The optical parametric oscillator of the frequency conversion crystals such as periodically poled lithium niobate (PPLN) has become acquisition mid-infrared laser and most adopts extensively
A kind of technological means.But since these crystal only have single frequency conversion function, it is also necessary to pass through rare earth ion doped increasing
Beneficial crystal provides fundamental frequency pump light.It shakes in contrast, rare earth ion incorporation additive mixing medium is formed to have from optical parameter
The Multifunctional centralized molding crystal swung is by more and more extensive concern, especially with the Nd of Nd (neodymium) ions binding magnesia doping:
MgO:PPLN crystal be representative, taken into account the integrated structural advantage of crystal function and quasi-phase matched frequency conversion advantage, be in it is red
The outer following very important developing direction of laser miniaturization.
For passing through Nd:MgO:PPLN from optical parametric oscillation output mid-infrared laser, the fundamental frequency gain of light is infrared in
Laser frequency conversion shares the same crystal of Nd:MgO:PPLN, and the fundamental frequency light that crystal generates is directly in the intracavitary pump formed to itself
Pu, this intracavity OPO pump framework, when gain crystal pumping source high power pump, fundamental frequency light beam quality and optical parameter
It is to obtain high efficiency mid-infrared laser key point that how oscillatory process focusing parameter matching degree, which ensures,.At present about Nd:MgO:
The report pump power of PPLN from optical parametric oscillation is lower, and problem encountered is not directed under high pump power, therefore institute
The cavity structure of use is to improving fundamental frequency light beam quality and ensureing focusing parameter matching not targetedly design, referring to document
“L.Barraco et al.,Self-optical parametric oscillation in periodically poled
Neodymium-doped lithium niobate, Opt.Lett.2002,27,1540 ", it is clear that this cavity structure can not be protected
Hinder and is operated under high power pump from the high efficiency of optical parametric oscillation.And it is infrared in the similar traditional inner cavity of operating system therewith
In PPLN-OPO report, causes fundamental frequency light beam quality to deteriorate for the reply serious fuel factor of high power pump bring, usually adopt
It is directly pumped with low Excited state, reducing fuel factor influences, and improves oscillation fundamental frequency facular model, while insertion is poly- in resonant cavity
Focus lens are designed in conjunction with compound cavity configuration, have both ensured that fundamental frequency light focal beam spot and place's parameteric light hot spot with a tight waist met matching relationship,
Play the role of " calm " to longer fundamental frequency optical cavity again, referring to document " Q.Sheng et al., Continuous-wave
mid-infrared intra-cavity single resonant PPLN-OPO under 880nm in-band
pumping,Opt.Express 2012,20,8041".It is to be noted that typically directly pumping wavelength is not in gain
Absorption of crystal main peak, relative to complete pump power, fundamental frequency light conversion efficiency is relatively low, in addition controls light for intracavitary insertion lens
The matched method of spot, in addition to causing loss to increase, complete machine integrated level reduces, due to gain crystal and frequency-changer crystal in PPLN-OPO
It is independent, it is clear that this method and not applicable this monocrystal of Nd:MgO:PPLN are from optical parametric oscillation structure.
Summary of the invention
In order to solve how to take into account high-power and high-lighting beam from optical parameter mid-infrared laser device based on Nd:MgO:PPLN crystal
Quality fundamental frequency light self- pomped and from optical parametric oscillation process focusing parameter matching the problem of, it is compound non-that the present invention provides a kind of two-chamber
Steady chamber modeling pumping from optical parametric oscillation mid-infrared laser device.
Used technical solution is as follows in order to solve the technical problem by the present invention:
Two-chamber of the invention compound unsteady cavity modeling pumping from optical parametric oscillation mid-infrared laser device, comprising: temperature controller；
The Nd:MgO:PPLN crystal being fitted on temperature controller controls the temperature of Nd:MgO:PPLN crystal by temperature controller；
Tertiary focusing lens, the one 45 degree are successively arranged on the light pass surface reflection direction of Nd:MgO:PPLN crystal left end
Beam splitter, the first condenser lens, the first energy-transmission optic fibre, first laser diode pumping source, first condenser lens and third
Condenser lens constitutes first laser diode pumping source coupled system；
The 4th condenser lens, the 2nd 45 degree are successively arranged on the light pass surface reflection direction of Nd:MgO:PPLN crystal right end
Beam splitter, the second condenser lens, the second energy-transmission optic fibre, second laser diode pumping source, second condenser lens and the 4th
Condenser lens constitutes second laser diode pumping source coupled system；
The acousto-optic Q-switching being located between the one 45 degree of beam splitter and the 2nd 45 degree of beam splitter, for realizing the arteries and veins of fundamental frequency light
Punching operating；
One 45 degree of beam splitter, tertiary focusing lens, Nd:MgO:PPLN crystal, the 4th condenser lens, the 2nd 45 degree
Beam splitter, acousto-optic Q-switching constitute fundamental frequency optical cavity, and the tertiary focusing lens and the 4th focus lens group are at biconvex unsteady cavity
Modeling structure；
The confocal type optical parametric osoillator being made of optical parametric osoillator total reflective mirror, optical parametric osoillator outgoing mirror, the Nd:MgO:
PPLN crystal is located at confocal type optical parametric osoillator place with a tight waist；
Emit the pump light of Nd:MgO:PPLN absorption of crystal peak wavelength by two pumping sources, pump light passes through respectively
The corresponding energy-transmission optic fibre of two pumping sources and laser diode pumping source coupled system are focused in Nd:MgO:PPLN crystal and are formed
Both-end high power pump；The Nd:MgO:PPLN absorption of crystal pump light forms population inversion, in holding for fundamental frequency optical cavity
Fundamental frequency light generation is formed under continuous feedback effect, the fundamental frequency light of oscillation obtains large base module high light beam quality fortune through biconvex unsteady cavity modeling
Turn, large base module high light beam quality fundamental frequency light simultaneously pumps Nd:MgO:PPLN Crystallization, keeps being formed by the process
Oscillation parameter light hot spot is with a tight waist to be overlapped with fundamental frequency light fundamental mode spot beam waist position, guarantees oscillation parameter light spot size and fundamental frequency light
Fundamental mode spot size meets focusing parameter matching；It is formed and is synchronized after fundamental frequency optical pump power is higher than optical parametric osoillator starting of oscillation threshold value
The signal light of oscillation is operated, the corresponding middle infrared band ideler frequency light generated is exported through optical parametric osoillator outgoing mirror.
Further, equal 400 μm of the core diameter of first energy-transmission optic fibre and the second energy-transmission optic fibre, numerical aperture equal 0.22.
Further, first condenser lens uses focal length for the biconvex mirror of 40mm or planoconvex lens, two-sided to be coated with
813nm pump light anti-reflection film；Second condenser lens uses focal length for the biconvex mirror of 40mm or planoconvex lens, two-sided to be coated with
813nm pump light anti-reflection film.
Further, the one 45 degree of beam splitter uses flat-flat mirror, two-sided to be coated with 813nm pump light anti-reflection film, leans on
Nearly Nd:MgO:PPLN crystal side single side is coated with 45 ° of high-reflecting films of 1084nm fundamental frequency light；The 2nd 45 degree of beam splitter using it is flat-
Flat mirror, it is two-sided to be coated with pump light anti-reflection film, 45 ° of high-reflecting films of fundamental frequency light are coated with close to Nd:MgO:PPLN crystal side single side.
Further, the light pass surface of the acousto-optic Q-switching is coated with 1084nm fundamental frequency light anti-reflection film, and driving ultrasonic frequency is
40.68MHz, radio-frequency power 20W.
Further, the tertiary focusing lens use focal length for the biconvex mirror of 80mm or planoconvex lens, two-sided to be coated with
813nm pump light anti-reflection film and 1084nm fundamental frequency light anti-reflection film；4th condenser lens uses focal length for the biconvex mirror of 80mm
Or planoconvex lens, it is two-sided to be coated with 813nm pump light anti-reflection film and 1084nm fundamental frequency light anti-reflection film.
Further, it is 200mm that the optical parametric osoillator total reflective mirror and optical parametric osoillator outgoing mirror, which are all made of radius of curvature,
Plano-concave mirror, be coated with 1400nm~1700nm signal light wave band high-reflecting film and 3300nm~4200nm ideler frequency optical band be high anti-
Film.
Further, the Nd:MgO:PPLN crystal is cut using a axis, and fundamental frequency light output wavelength is 1084nm, size
Are as follows: thickness × width x length=2mm × 2mm × 30mm, MgO doping concentration are 5%, Nd3+Ion doping concentration is 0.2%, polarization week
Phase length is 29.5 μm, and temperature is controlled at 25 DEG C.
Further, the light pass surface at Nd:MgO:PPLN crystal both ends does 45 ° of sections, and the light pass surface at both ends is plated
Have 45 ° of high-reflecting films of 813nm pump light, 45 ° of high-reflecting films of 1084nm fundamental frequency light, 1400nm~1700nm signal light wave band high transmittance film,
3300nm~4200nm ideler frequency optical band high transmittance film.
Further, the focusing parameter ξ=L/b, L are Nd:MgO:PPLN crystal length, confocal parameter b=2 π n ω2/
λ, n are corresponding laser refraction rate, and ω is corresponding laser beam waist radius, and λ is corresponding optical maser wavelength.
The beneficial effects of the present invention are: the present invention breaches tradition from optical parametric oscillation mid-infrared laser device in high power pumps
Technology limitation in terms of Pu, solves how to realize from optical parameter mid-infrared laser device currently based on Nd:MgO:PPLN crystal
Preferable fundamental frequency light beam quality and how effective from optical parametric oscillation process focusing parameter matching degree is obtained under high power pump
Control the two difficulties.
The present invention is based on what Nd:MgO:PPLN crystal had to integrate advantage from optical parametric oscillation function, by using fundamental frequency
Optical cavity and parameter light generation chamber two-chamber composite construction, while taking into account integrated compactedness, so that two chambers are kept completely separate
Work, ensure that two chamber cavity structure parameter designings are not interfere with each other, does not increase the basis of additional optical elements in two chambers
On, condenser lens a part of in pumping source coupled system is cleverly introduced into fundamental frequency optical cavity and forms biconvex unsteady cavity, and root
According to the chamber length and hysteroscope curvature of two-chamber overlapping region fundamental frequency light hot spot parameter optimization parameter light generation chamber with a tight waist, finally can be realized
The optical pumping of large base module high light beam quality fundamental frequency, oscillation parameter light and fundamental frequency light focusing parameter matched reach promotion from beche-de-mer without spike
The purpose of amount oscillation mid-infrared laser device delivery efficiency.This compound unsteady cavity modeling of two-chamber pumps red from optical parametric oscillation
Outer laser is suitable for pumping source high power pump, with the high protrusion of Highgrade integration, good beam quality, energy conversion efficiency
Feature.
Detailed description of the invention
Fig. 1 is a kind of compound unsteady cavity modeling pumping of two-chamber provided by the invention from optical parametric oscillation mid-infrared laser device
Structural schematic diagram.
In figure: 1, first laser diode pumping source；2, second laser diode pumping source；3, the first energy-transmission optic fibre；4,
Second energy-transmission optic fibre；5, the first condenser lens；6, the second condenser lens；7, the one 45 degree of beam splitter；8, the 2nd 45 degree of beam splitter；
9, tertiary focusing lens；10, the 4th condenser lens；11, optical parametric osoillator total reflective mirror；12, optical parametric osoillator outgoing mirror；13,Nd:
MgO:PPLN crystal；14, temperature controller；15, acousto-optic Q-switching.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
As shown in Figure 1, a kind of two-chamber of the invention compound unsteady cavity modeling pumping from optical parametric oscillation mid-infrared laser
Device specifically includes that first laser diode pumping source 1, second laser diode pumping source 2, the first energy-transmission optic fibre 3, second pass
It can optical fiber 4, the first condenser lens 5, the second condenser lens 6, the 1st degree of beam splitters 7, the 2nd 45 degree of beam splitters 8, tertiary focusing
Lens 9, the 4th condenser lens 10, optical parametric osoillator total reflective mirror 11, optical parametric osoillator outgoing mirror 12, Nd:MgO:PPLN crystal 13,
Temperature controller 14 and acousto-optic Q-switching 15.
Nd:MgO:PPLN crystal 13 is fitted tightly on temperature controller 14, controls Nd:MgO:PPLN crystal by temperature controller 14
13 temperature.Optical parametric osoillator total reflective mirror 11 and parametric oscillation are disposed in 13 horizontal optical path of Nd:MgO:PPLN crystal
Chamber outgoing mirror 12, i.e. optical parametric osoillator total reflective mirror 11 are arranged in 13 horizontal optical path left end of Nd:MgO:PPLN crystal, optical parametric osoillator
Outgoing mirror 12 is arranged in 13 horizontal optical path right end of Nd:MgO:PPLN crystal.
13 both ends light pass surface reflection direction of Nd:MgO:PPLN crystal be on the optical path direction vertical with horizontal optical path direction according to
Secondary first laser diode pumping source 1, second laser diode pumping source 2, the first energy-transmission optic fibre 3, second of being provided with passes energy light
Fine 4, first condenser lens 5, the second condenser lens 6, the 1st degree of beam splitters 7, the 2nd 45 degree of beam splitters 8, tertiary focusing lens
9, the 4th condenser lens 10, acousto-optic Q-switching 15.Particularly: the light pass surface reflection direction in 13 left end of Nd:MgO:PPLN crystal
(optical path direction vertical with 13 horizontal optical path direction of Nd:MgO:PPLN crystal is the reflection of 13 light pass surface of Nd:MgO:PPLN crystal
Direction) on be disposed with: 9, the 1st degree of beam splitters 7 of tertiary focusing lens, the first condenser lens 5, the first energy-transmission optic fibre 3,
First laser diode pumping source 1；It is disposed on the light pass surface reflection direction of 13 right end of Nd:MgO:PPLN crystal: the
Four 10, the 2nd 45 degree of condenser lens beam splitter 8, the second condenser lens 6, the second energy-transmission optic fibres 4, second laser diode pumping source
2.Acousto-optic Q-switching 15 is arranged between the one 45 degree of beam splitter 7 and the 2nd 45 degree of beam splitter 8.The one 45 degree of setting of beam splitter 7 exists
Between first condenser lens 5 and tertiary focusing lens 9, the 2nd 45 degree of setting of beam splitter 8 is focused in the second condenser lens 6 and the 4th
Between lens 10.
Equal 400 μm of the core diameter of first energy-transmission optic fibre 3 and the second energy-transmission optic fibre 4, while numerical aperture equal 0.22.
First condenser lens 5 uses focal length for the biconvex mirror of 40mm or planoconvex lens, and two-sided to be coated with 813nm pump light anti-reflection
Film.
Second condenser lens 6 uses focal length for the biconvex mirror of 40mm or planoconvex lens, and two-sided to be coated with 813nm pump light anti-reflection
Film.
One 45 degree of beam splitter 7 is two-sided to be coated with 813nm pump light anti-reflection film using flat-flat mirror, single side (close to Nd:
13 side of MgO:PPLN crystal) it is coated with 45 ° of high-reflecting films of 1084nm fundamental frequency light.
2nd 45 degree of beam splitter 8 is two-sided to be coated with pump light anti-reflection film using flat-flat mirror, single side (close to Nd:MgO:
13 side of PPLN crystal) it is coated with 45 ° of high-reflecting films of fundamental frequency light.
The light pass surface of acousto-optic Q-switching 15 is coated with 1084nm fundamental frequency light anti-reflection film, and driving ultrasonic frequency is 40.68MHz, penetrates
Frequency power is 20W.
Tertiary focusing lens 9 use focal length for the biconvex mirror of 80mm or planoconvex lens, and two-sided to be coated with 813nm pump light anti-reflection
Film and 1084nm fundamental frequency light anti-reflection film.
4th condenser lens 10 uses focal length for the biconvex mirror of 80mm or planoconvex lens, two-sided to be coated with the increasing of 813nm pump light
Permeable membrane and 1084nm fundamental frequency light anti-reflection film.
Optical parametric osoillator total reflective mirror 11 uses radius of curvature for the plano-concave mirror of 200mm, is coated with 1400nm~1700nm signal
Optical band and 3300nm~4200nm ideler frequency optical band high-reflecting film.
Optical parametric osoillator outgoing mirror 12 uses radius of curvature for the plano-concave mirror of 200mm, is coated with 1400nm~1700nm signal
Optical band high-reflecting film and 3300nm~4200nm ideler frequency optical band high transmittance film.
Nd:MgO:PPLN crystal 13 is cut using a axis, and fundamental frequency light output wavelength is 1084nm, crystalline size are as follows: thick ×
Width x length=2mm × 2mm × 30mm, MgO doping concentration are set in 5%, Nd3+Ion doping concentration is set in 0.2%, polarization week
Phase length is set as 29.5 μm, and the light pass surface at 13 both ends of Nd:MgO:PPLN crystal does 45 ° of sections, and the light pass surface at both ends is plated
Have 45 ° of high-reflecting films of 813nm pump light, 45 ° of high-reflecting films of 1084nm fundamental frequency light, 1400nm~1700nm signal light wave band high transmittance film,
3300nm~4200nm ideler frequency optical band high transmittance film.Nd:MgO:PPLN crystal 13 is fitted tightly on temperature controller 14, and temperature is accurate
Control is at 25 DEG C.
The light pass surface of acousto-optic Q-switching 15 is coated with fundamental frequency light anti-reflection film, so that fundamental frequency light is realized pulse fortune by acousto-optic Q-switching 15
Turn.
A kind of two-chamber of the invention compound unsteady cavity modeling pumping from optical parametric oscillation mid-infrared laser device, it is described
First condenser lens 5 and tertiary focusing lens 9 constitute first laser diode pumping source coupled system, 6 He of the second condenser lens
4th condenser lens 10 constitutes second laser diode pumping source coupled system.
Described the one 45 degree of beam splitter 7, tertiary focusing lens 9, the 2nd 45 degree of beam splitters 8, the 4th condenser lens 10, sound
Light Q-switch 15, Nd:MgO:PPLN crystal 13 constitute fundamental frequency optical cavity.
Described optical parametric osoillator total reflective mirror 11,13 optical parametric osoillator outgoing mirror 12 of Nd:MgO:PPLN crystal, constitute it is confocal
Type optical parametric osoillator, Nd:MgO:PPLN crystal 13 are located at confocal type optical parametric osoillator place with a tight waist.
A kind of two-chamber of the invention compound unsteady cavity modeling pumping from optical parametric oscillation mid-infrared laser device, first laser
Diode pumping source 1 and second laser diode pumping source 2 emit the pumping that Nd:MgO:PPLN crystal 13 absorbs peak wavelength
Light, pump light are respectively focused in Nd:MgO:PPLN crystal 13 by energy-transmission optic fibre and pumping source coupled system by left and right ends,
Both-end pumping mode is constituted, Nd:MgO:PPLN crystal 13 absorbs pump light and forms population inversion, holds in fundamental frequency optical cavity
Fundamental frequency light generation, tertiary focusing lens 9, the 4th condenser lens 10 for including in the fundamental frequency optical cavity are formed under continuous feedback effect
Biconvex unsteady cavity modeling structure is formed, the fundamental frequency light of oscillation obtains the operating of large base module high light beam quality through biconvex unsteady cavity modeling；
Large base module high light beam quality fundamental frequency light forms Nd:MgO:PPLN crystal 13 pump simultaneously, by optical parametric osoillator total reflective mirror 11
With the long design of curvature design, optical parametric osoillator chamber of optical parametric osoillator outgoing mirror 12, guarantee oscillation parameter light hot spot is girdled the waist and base
Frequency light fundamental mode spot beam waist position is overlapped, and guarantees that oscillation parameter light spot size is corresponding with fundamental frequency light fundamental mode spot size satisfaction
Focusing parameter ξ=L/b matching, wherein L is 13 length of Nd:MgO:PPLN crystal, confocal parameter b=2 π n ω2/ λ, wherein n is phase
Stress optical index, ω be corresponding laser beam waist radius, λ be corresponding optical maser wavelength, when fundamental frequency optical pump power be higher than parameter vibration
After swinging chamber starting of oscillation threshold value, the signal light for operating synchronously stable oscillation stationary vibration is formed, the corresponding middle infrared band ideler frequency light generated is by ginseng
Amount oscillation chamber outgoing mirror 12 exports.
A kind of specific reality from optical parametric oscillation mid-infrared laser device of the compound unsteady cavity modeling pumping of two-chamber of the invention
Existing process is as follows:
The laser for being 813nm by 1 launch wavelength of first laser diode pumping source is realized through the first energy-transmission optic fibre 3 and is swashed
Light output, then the first laser diode pumping source coupled system constituted through the first condenser lens 5 and tertiary focusing lens 9 focus
Into Nd:MgO:PPLN crystal 13；The laser for being simultaneously 813nm by 2 launch wavelength of second laser diode pumping source, through the
Two energy-transmission optic fibres 4 realize laser output, then the second laser diode constituted through the second condenser lens 6 and the 4th condenser lens 10
Pumping source coupled system focuses in Nd:MgO:PPLN crystal 13, forms a kind of both-end pumping mode at this time, while in Nd:
13 both ends of MgO:PPLN crystal are respectively formed 1:2 hot spot ratio (ratio of pump spot diameter and focal beam spot diameter is 1:2)
Focal pumping, focal beam spot diameter be 800 μm.
First laser diode pumping source 1, second laser diode pumping source 2, energy-transmission optic fibre and pumping source coupled system
Both-end high power pump is formed to Nd:MgO:PPLN crystal 13, it is anti-that Nd:MgO:PPLN crystal 13 absorbs pump light formation population
Turn, under the constant feedback effect for the fundamental frequency optical cavity being made of the one 45 degree of beam splitter 7 and the 2nd 45 degree of beam splitter 8,
The light generation of 1084nm fundamental frequency is formed in fundamental frequency optical cavity, the tertiary focusing lens the 9, the 4th for including in the fundamental frequency optical cavity are poly-
Focus lens 10 form biconvex unsteady cavity modeling structure, and the 1084nm fundamental frequency light of oscillation obtains large base module height through biconvex unsteady cavity modeling
Beam quality operating, while the narrow arteries and veins of 1084nm high light beam quality to Nd:MgO:PPLN crystal 13 is formed by acousto-optic Q-switching 15
Punching pumping.
The confocal type optical parametric osoillator being made of optical parametric osoillator total reflective mirror 11 and optical parametric osoillator outgoing mirror 12, chamber are a length of
200mm, Nd:MgO:PPLN crystal 13 is in this optical parametric osoillator place with a tight waist.Under 1084nm fundamental frequency light action, work as parametric oscillation
Chamber starts infrared ideler frequency light in the synchronous 1516nm signal light and 3800nm for generating oscillation, optical parametric osoillator after reaching starting of oscillation threshold value
The 1516nm oscillation parameter light hot spot of middle oscillation meets focusing parameter with 1084nm fundamental frequency light fundamental mode spot size and matches, 3800nm
In infrared ideler frequency light constantly amplify between optical parametric osoillator total reflective mirror 11 and optical parametric osoillator outgoing mirror 12, while passing through parameter
Chamber outgoing mirror 12 is vibrated to export.
By using fundamental frequency optical cavity and parameter light generation chamber two-chamber composite construction, do not increasing additional optical elements
On the basis of, condenser lens a part of in pumping source coupled system is introduced into fundamental frequency optical cavity and forms biconvex unsteady cavity modeling, root
According to the chamber length and hysteroscope curvature of two-chamber overlapping region fundamental frequency light hot spot parameter optimization parameter light generation chamber with a tight waist, to realize big base
The optical pumping of mould high light beam quality fundamental frequency, oscillation parameter light and fundamental frequency light focusing parameter matched reach promotion and shake from optical parameter
The delivery efficiency for swinging mid-infrared laser device, solve based on Nd:MgO:PPLN crystal from optical parameter mid-infrared laser device how
Take into account high power and high beam quality fundamental frequency light self- pomped and from the problem of the matching of optical parametric oscillation process focusing parameter.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. two-chamber compound unsteady cavity modeling pumping from optical parametric oscillation mid-infrared laser device characterized by comprising temperature controller
(14)；
The Nd:MgO:PPLN crystal (13) being fitted on temperature controller (14) controls Nd:MgO:PPLN crystal by temperature controller (14)
(13) temperature；
Tertiary focusing lens (9), the 1st are successively arranged on the light pass surface reflection direction of Nd:MgO:PPLN crystal (13) left end
Degree beam splitter (7), the first condenser lens (5), the first energy-transmission optic fibre (3), first laser diode pumping source (1), described first
Condenser lens (5) and tertiary focusing lens (9) constitute first laser diode pumping source coupled system；
The 4th condenser lens (10), second are successively arranged on the light pass surface reflection direction of Nd:MgO:PPLN crystal (13) right end
45 degree of beam splitters (8), the second condenser lens (6), the second energy-transmission optic fibre (4), second laser diode pumping source (2), described
Two condenser lenses (6) and the 4th condenser lens (10) constitute second laser diode pumping source coupled system；
The acousto-optic Q-switching (15) being located between the one 45 degree of beam splitter (7) and the 2nd 45 degree of beam splitter (8), for realizing fundamental frequency
The pulse of light operates；
The laser uses fundamental frequency optical cavity and parameter light generation chamber two-chamber composite construction, in which: described one 45 degree point
Shu Jing (7), tertiary focusing lens (9), Nd:MgO:PPLN crystal (13), the 4th condenser lens (10), the 2nd 45 degree of beam splitter
(8), acousto-optic Q-switching (15) constitutes the fundamental frequency optical cavity, the tertiary focusing lens (9) and the 4th condenser lens (10) group
At biconvex unsteady cavity modeling structure；Confocal type ginseng is made of optical parametric osoillator total reflective mirror (11), optical parametric osoillator outgoing mirror (12)
Amount oscillation chamber, the Nd:MgO:PPLN crystal (13) are located at confocal type optical parametric osoillator place with a tight waist；
The pump light of peak wavelength is absorbed by two pumping source transmittings Nd:MgO:PPLN crystal (13), pump light passes through respectively
The corresponding energy-transmission optic fibre of two pumping sources and laser diode pumping source coupled system focus in Nd:MgO:PPLN crystal (13)
Form both-end high power pump；The Nd:MgO:PPLN crystal (13) absorbs pump light and forms population inversion, humorous in fundamental frequency light
Fundamental frequency light generation is formed under the constant feedback effect of vibration chamber, the fundamental frequency light of oscillation obtains large base module bloom through biconvex unsteady cavity modeling
Beam quality operating, large base module high light beam quality fundamental frequency light form Nd:MgO:PPLN crystal (13) pump simultaneously, in the process
Holding is formed by that oscillation parameter light hot spot is with a tight waist to be overlapped with fundamental frequency light fundamental mode spot beam waist position, guarantee oscillation parameter light hot spot
Size meets focusing parameter with fundamental frequency light fundamental mode spot size and matches；When fundamental frequency optical pump power is higher than optical parametric osoillator starting of oscillation threshold
The signal light for operating synchronously oscillation is formed after value, the corresponding middle infrared band ideler frequency light generated is through optical parametric osoillator outgoing mirror (12)
Output.
2. the compound unsteady cavity modeling pumping of two-chamber according to claim 1 from optical parametric oscillation mid-infrared laser device,
It is characterized in that, equal 400 μm of core diameter of first energy-transmission optic fibre (3) and the second energy-transmission optic fibre (4), numerical aperture equal 0.22.
3. the compound unsteady cavity modeling pumping of two-chamber according to claim 1 from optical parametric oscillation mid-infrared laser device,
It is characterized in that, first condenser lens (5) uses focal length for the biconvex mirror of 40mm or planoconvex lens, two-sided to be coated with 813nm pump
Pu light anti-reflection film；Second condenser lens (6) uses focal length for the biconvex mirror of 40mm or planoconvex lens, two-sided to be coated with 813nm
Pump light anti-reflection film.
4. the compound unsteady cavity modeling pumping of two-chamber according to claim 1 from optical parametric oscillation mid-infrared laser device,
It being characterized in that, the one 45 degree of beam splitter (7) uses flat-flat mirror, and it is two-sided to be coated with 813nm pump light anti-reflection film, close to Nd:
MgO:PPLN crystal (13) side single side is coated with 45 ° of high-reflecting films of 1084nm fundamental frequency light；The 2nd 45 degree of beam splitter (8) uses
Flat-flat mirror, it is two-sided to be coated with pump light anti-reflection film, 45 ° of height of fundamental frequency light are coated with close to Nd:MgO:PPLN crystal (13) side single side
Anti- film.
5. the compound unsteady cavity modeling pumping of two-chamber according to claim 1 from optical parametric oscillation mid-infrared laser device,
It is characterized in that, the light pass surface of the acousto-optic Q-switching (15) is coated with 1084nm fundamental frequency light anti-reflection film, and driving ultrasonic frequency is
40.68MHz, radio-frequency power 20W.
6. the compound unsteady cavity modeling pumping of two-chamber according to claim 1 from optical parametric oscillation mid-infrared laser device,
It is characterized in that, the tertiary focusing lens (9) use focal length for the biconvex mirror of 80mm or planoconvex lens, two-sided to be coated with 813nm pump
Pu light anti-reflection film and 1084nm fundamental frequency light anti-reflection film；4th condenser lens (10) uses focal length as the biconvex mirror of 80mm or puts down
Convex lens, it is two-sided to be coated with 813nm pump light anti-reflection film and 1084nm fundamental frequency light anti-reflection film.
7. the compound unsteady cavity modeling pumping of two-chamber according to claim 1 from optical parametric oscillation mid-infrared laser device,
It is characterized in that, the optical parametric osoillator total reflective mirror (11) and optical parametric osoillator outgoing mirror (12) are all made of radius of curvature as 200mm
Plano-concave mirror, be coated with 1400nm~1700nm signal light wave band high-reflecting film and 3300nm~4200nm ideler frequency optical band be high anti-
Film.
8. the compound unsteady cavity modeling pumping of two-chamber according to claim 1 from optical parametric oscillation mid-infrared laser device,
It is characterized in that, the Nd:MgO:PPLN crystal (13) is cut using a axis, and fundamental frequency light output wavelength is 1084nm, size are as follows:
Thickness × width x length=2mm × 2mm × 30mm, MgO doping concentration are 5%, Nd3+Ion doping concentration is 0.2%, and polarization cycle is long
Degree is 29.5 μm, and temperature is controlled at 25 DEG C.
9. the compound unsteady cavity modeling pumping of two-chamber according to claim 1 from optical parametric oscillation mid-infrared laser device,
It is characterized in that, the light pass surface at Nd:MgO:PPLN crystal (13) both ends does 45 ° of sections, and the light pass surface at both ends is coated with
45 ° of high-reflecting films of 813nm pump light, 45 ° of high-reflecting films of 1084nm fundamental frequency light, 1400nm~1700nm signal light wave band high transmittance film,
3300nm~4200nm ideler frequency optical band high transmittance film.
10. the compound unsteady cavity modeling pumping of two-chamber according to claim 1 from optical parametric oscillation mid-infrared laser device,
It is characterized in that, the focusing parameter ξ=L/b, L are Nd:MgO:PPLN crystal (13) length, confocal parameter b=2 π n ω2/ λ, n
For corresponding laser refraction rate, ω is corresponding laser beam waist radius, and λ is corresponding optical maser wavelength.
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| CN108899753B (en) * | 2018-08-21 | 2024-04-02 | 深圳市格镭激光科技有限公司 | End-face uniform pumping solid laser |
| CN112993727B (en) * | 2021-02-02 | 2022-06-03 | 长春理工大学 | Intermediate infrared differential dual-wavelength laser based on multi-period Nd-MgO-PPLN servo matching control |
| CN112993729B (en) * | 2021-02-02 | 2022-10-28 | 长春理工大学 | Low-quantum-loss 1.6-micrometer high-peak-power pumping source of medium-wave optical parametric oscillator |
| CN113314940B (en) * | 2021-05-27 | 2022-06-03 | 长春理工大学 | Multi-wavelength mid-infrared laser pulse train cavity emptying laser based on Nd, MgO and APLN crystals |
| CN114256721B (en) * | 2021-12-16 | 2022-12-02 | 长春理工大学 | Intermediate infrared self-frequency-conversion laser based on sandwich waveguide Nd-MgO-PPLN crystal |
| CN114243434B (en) * | 2021-12-16 | 2022-12-30 | 长春理工大学 | Multi-wavelength mid-infrared parametric oscillator based on gain clipping regulation |
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| CN103236633B (en) * | 2013-04-24 | 2015-04-29 | 哈尔滨工业大学 | 3-5-micron waveband intermediate infrared solid laser |
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