CN109510056A - A kind of while output the hollow laser of dual wavelength - Google Patents
A kind of while output the hollow laser of dual wavelength Download PDFInfo
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- CN109510056A CN109510056A CN201910066066.3A CN201910066066A CN109510056A CN 109510056 A CN109510056 A CN 109510056A CN 201910066066 A CN201910066066 A CN 201910066066A CN 109510056 A CN109510056 A CN 109510056A
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0071—Beam steering, e.g. whereby a mirror outside the cavity is present to change the beam direction
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/101—Lasers provided with means to change the location from which, or the direction in which, laser radiation is emitted
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- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Physics & Mathematics (AREA)
- Lasers (AREA)
Abstract
The invention discloses a kind of hollow lasers of dual wavelength of output simultaneously, including plane output coupling mirror (1), V-arrangement conscope (2), positive round axicon lens (3), laser gain medium (4), plane mirror (5) and the negative conscope (8) set gradually from left to right；Coupling optical system (6) and semiconductor laser array (7) are provided with immediately below the plane mirror (5)；The laser gain medium (4), positive round axicon lens (3), V-arrangement conscope (2), negative conscope (8) and plane output coupling mirror (1) constitute laser resonator, the right side of the laser gain medium (4) is the input mirror of laser resonator, outgoing mirror of the plane output coupling mirror (1) as laser resonator.In the present invention, Laser Output Beam optical intensity on the cross section center has the concentric loop compared with Great Dark Spot size, and the wavelength of the inner and outer ring of concentric loop is different, increases the application prospect of hollow beam.
Description
Technical field
The present invention relates to laser technologies, more particularly to a kind of hollow laser of dual wavelength of output simultaneously.
Background technique
Dual laser is widely used in interfering rainbow holography, fine laser spectrum, differential absorption lidar, atom
With multi-photon distribution ionization, nonlinear optical frequency conversion technology, laser medicine, the laser display of high brightness and the laser of molecule
In the fields such as printing.However, the light beam that current dual laser exports is solid Gaussian function distribution, can not expire
The demand of the existing special dimension of foot, such as the dual-wavelength laser of solid Gaussian beam profile can not be to two microcosmic particles simultaneously
Manipulate, can not achieve space from phase-matching technique, two different biological cells cannot be captured simultaneously etc..
The characteristics of hollow beam is a kind of light beam that central light strength or axial intensity are zero in the propagation direction, such light beam
It is that the point that beam center intensity is zero has position mutually uncertain there are position phase singular point.This light beam is in addition to laser frequency
It is in cylinder there are also its unique physical property, such as intensity outside the general parameters of the laser beams such as rate, laser power and beam divergence angle
Shape distribution, the blackening size of very little, without heating effect, propagate invariance and there are spinning and orbit angular momentum etc., these property
Matter makes hollow beam in laser optics, optical information processing, particle waveguide, microelectronics and material science, biotechnology, medicine
And it has a wide range of applications in the fields such as atomics, molecules.However, current hollow beam is only limitted to single wave
It is long, therefore seriously affected the application of hollow beam.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of hollow laser of dual wavelength of output simultaneously
Device, Laser Output Beam optical intensity on the cross section center have the concentric loop compared with Great Dark Spot size, and the inner and outer ring of concentric loop
Wavelength it is different, increase the application prospect of hollow beam.
The purpose of the present invention is achieved through the following technical solutions: a kind of hollow laser of dual wavelength of output simultaneously
Device, including plane output coupling mirror, V-arrangement conscope, positive round axicon lens, the laser gain medium, plane set gradually from left to right
Reflecting mirror and negative conscope；Coupling optical system and semiconductor laser array are provided with immediately below the plane mirror；
The laser gain medium, positive round axicon lens, V-arrangement conscope, negative conscope and plane output coupling mirror constitute double wave
Long laser resonator, the right side of the laser gain medium are the input mirror of laser resonator, and plane output coupling mirror is made
For the outgoing mirror of laser resonator.The pump light that pumping source (semiconductor laser array) issues is by coupling optical system by plane
Pump light is coupled in gain media by reflecting mirror by end pumping mode, humorous after dual wavelength reaches laser threshold simultaneously
It shakes the hollow laser generation of intracavitary generation dual wavelength.
Preferably, the plane output coupling mirror, V-arrangement conscope, positive round axicon lens, laser gain medium, plane mirror
It is located on same level straight line with the center of negative conscope.The setting angle of the plane mirror is pressed from both sides from the horizontal by 45 degree
Angle, and the center of plane mirror and coupling optical system and semiconductor laser array is located in same vertical straight line.
Wherein, the V-arrangement conscope, positive round axicon lens and negative conscope are made of K9 glass；Inside and outside the V-arrangement conscope
The angle of bus is equal to the angle of positive round axicon lens bus and bottom surface；The negative cone angle of the V-arrangement conscope is equal to the cone of positive round axicon lens
Angle angle；The positive cone angle and negative cone angle of the V-arrangement conscope meet following relationship:
ω2=2 ω1-π；
Wherein, ω2For the positive angle of taper of V-arrangement conscope, ω1For the negative angle of taper of V-arrangement conscope, V-arrangement conscope with
Normal cone microscope group, which is closed, constitutes telescopic system.
The cone angle of the negative conscope and the cone angle of positive round axicon lens meet following relationship:
ω3=2arcsin [ncos (ω1/2)]+3ω1-2π；
Wherein n is the refractive index of K9 glass, ω3Be negative the angle of taper of conscope；ω1Be positive the angle of taper of conscope,
Positive round axicon lens, V-arrangement conscope and negative conscope constitute telescopic system.
Preferably, the V-arrangement conscope is to wavelength X1Anti-reflection film is plated, while the concave surface of V-arrangement conscope is to wavelength X2Plating is high anti-
Penetrate film；Positive round axicon lens is to wavelength X1And λ2Plate anti-reflection film；Laser gain medium plates anti-reflection film, while right side to pumping wavelength
To wavelength X1And λ2Plate highly reflecting films；Plane mirror plates highly reflecting films to pumping wavelength；The conical surface of negative conscope is to wavelength X1
And λ2Plate highly reflecting films, wherein wavelength X1、λ2Two output wavelengths of laser respectively.The plane output coupling mirror is to wave
Long λ1And λ2The reflectivity plated meets following relationship:
Wherein, R1And R2Respectively wavelength X1And λ2Reflectivity, σ1And σ2Respectively wavelength X1And λ2Emission cross section face
Product, L1And L2Respectively wavelength X1And λ2Passive loss.
For intracavitary λ1(set λ1>λ2) wavelength laser shift theory are as follows: laser beam is intracavitary to swash after the refraction of positive round axicon lens
Light beam becomes the hollow beam of diverging, as the negative cone angle ω of V-arrangement conscope2The cone angle ω of positive round axicon lens1Sufficient ω2=2 ω1- π is closed
When being, V-arrangement conscope and positive round axicon lens constitute telescopic system, i.e. wavelength is λ1The hollow laser beam of diverging passes through V-arrangement conscope
The hollow beam for becoming parallel afterwards is output to outside chamber through plane output coupling mirror.For intracavitary λ2Wavelength laser shift theory are as follows:
Laser beam is after the refraction of positive round axicon lens, the hollow beam of endovenous laser Shu Bianwei diverging, and the hollow beam of diverging is by V-arrangement circle
Axicon lens and the reflection of negative conscope, as the cone angle ω of negative conscope3With the cone angle ω of positive round axicon lens1When meeting following relationship:
ω3=2arcsin [ncos (ω1/2)]+3ω1-2π
Positive round axicon lens, V-arrangement conscope and negative conscope constitute telescopic system, i.e. wavelength is λ2The hollow beam of diverging passes through
Become parallel hollow laser beam after negative conscope reflection to be output to outside chamber through plane output coupling mirror.Dual wavelength reaches threshold simultaneously
The condition of value are as follows:That is plane output coupling mirror is to λ1And λ2That is plated is anti-
The rate of penetrating should meet the formula.
The beneficial effects of the present invention are: Laser Output Beam optical intensity on the cross section center has compared with Great Dark Spot ruler in the present invention
Very little concentric loop, and the wavelength of the inner and outer ring of concentric loop is different, increases the application prospect of hollow beam.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of laser of the present invention；
Fig. 2 is intracavity wavelength λ1Optical beam transformation schematic diagram；
Fig. 3 is intracavity wavelength λ2Optical beam transformation schematic diagram；
Fig. 4 is negative the cone angle ω of conscope3With the negative cone angle ω of V-arrangement conscope1Relation curve schematic diagram；
In figure, 1- plane output coupling mirror, 2-V shape conscope, 3- positive round axicon lens, 4- laser gain medium, 5- plane is anti-
Penetrate mirror, 6- coupling optical system, 7- semiconductor laser array, the negative conscope of 8-.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing, but protection scope of the present invention is not limited to
It is as described below.
As shown in Figure 1, a kind of hollow laser of dual wavelength of output simultaneously, the plane including setting gradually from left to right are defeated
Coupling mirror 1, V-arrangement conscope 2, positive round axicon lens 3, laser gain medium 4, plane mirror 5 and negative conscope 8 out；The plane
The underface of reflecting mirror 5 is provided with coupling optical system 6 and semiconductor laser array 7；The laser gain medium 4, normal cone
Mirror 3, V-arrangement conscope 2, negative conscope 8 and plane output coupling mirror 1 constitute laser resonator, the right side of the laser gain medium 4
End face is the input mirror of laser resonator, outgoing mirror of the plane output coupling mirror 1 as laser resonator.The plane exports coupling
The center of mirror 1, V-arrangement conscope 2, positive round axicon lens 3, laser gain medium 4, plane mirror 5 and negative conscope 8 is closed positioned at same
On horizontal linear.The setting angle of the plane mirror 5 from the horizontal by 45 degree of angles, and plane mirror 5 with couple
The center of optical system 6 and semiconductor laser array 7 is located in same vertical straight line.
As shown in Fig. 2, being intracavity wavelength λ1Optical beam transformation schematic diagram, if the negative cone angle and positive cone angle of V-arrangement conscope 2 point
It Wei not ω1And ω2, the cone angle of positive round axicon lens 3 and negative conscope 8 is respectively ω1And ω3。
For endovenous laser wavelength X1, the angle of bus is equal to positive round axicon lens bus and bottom surface inside and outside V-arrangement conscope
When angle α, it can be obtained according to geometrical relationship: ω2=2 ω1- π, i.e., when the cone angle of the negative cone angle of V-arrangement conscope 2 and positive round axicon lens 3 is full
Sufficient ω2=2 ω1Telescopic system is constituted when-π relationship.Distinguishingly, the present embodiment chooses the cone of V-arrangement conscope 2 and positive round axicon lens 3
Angle ω1=120 °, it can obtain the positive cone angle ω of V-arrangement conscope 22=60 °.
As shown in figure 3, being intracavity wavelength λ2Optical beam transformation schematic diagram: for endovenous laser wavelength X2, according to the law of refraction
Have: nsin α=sin γ, γ are refraction angle of the light beam after positive round axicon lens 3.
If the refracted light of positive round axicon lens 3 is with the held angle of horizontal axisIt can obtainTo
If it is δ that light beam, which is incident on the incidence angle in V-arrangement conscope 2 on side bus, then have
When light becomes horizontal light beam after the refraction of negative conscope 8, the angle of incident ray and reflection light is
β, from the geometric relations:
Again due to α=(π-ω1)/2, β=(π-ω3)/2, then have
ω3=2arcsin [ncos (ω1/2)]+3ω1-2π
The material of all conscopes of the present invention is selected as K9 glass, dispersion of refractive index Cauchy's expression formula of K9 glassWith λ2=1064nm is updated to above formula analog and goes out ω3And ω1Relation curve such as
Shown in Fig. 4, ω3And ω1When meeting above formula, V-arrangement conscope 2, positive round axicon lens 3 and negative conscope 8 constitute telescopic system.Distinguishingly,
The cone angle ω of the present embodiment selection V-arrangement conscope 2 and positive round axicon lens 31=120 °, it can obtain the cone angle ω of negative conscope 83=
108°。
In embodiments herein, pumping wavelength (the i.e. output light wavelength of pumping source, that is, semiconductor laser array
Output light wavelength) be 808nm, laser wavelength lambda1=1342nm, λ2=1064nm, specifically, the pumping source use output wave
The semiconductor laser of a length of 808nm fiber-coupled diode array；Coupling optical system 6 uses core diameter for 400 μm of light
The fine plano-convex lens composition opposite with a pair of of convex surface, is injected into laser gain medium 4 for pump power by end pumping mode
In, specifically, pumping source is impinged perpendicularly on pump light in two plano-convex lens by optical fiber, after pump light passes through plano-convex lens
After coupling, pump light is reflected in injection laser gain medium 4 through plane mirror 5；The use of laser gain medium 4 Φ 3mm ×
The Yttrium Orthovanadate Nd:YVO of the neodymium ion doped concentration of 3mm × 5mm, 0.4at.%4Crystal；To pumping source and Nd:YVO4Carry out TEC cause
Cold, temperature is controlled in 15 ° of ± 0.5 ° of ranges；4 light pass surface of laser gain medium plates anti-reflection film to 808nm, while right side is as humorous
The input mirror of vibration chamber plates highly reflecting films to 1064nm and 1342nm；ByShow that plane is defeated
Coupling mirror is to wavelength R out1When=98%, R2=87%, wherein σ1=7.6 × 10-19cm2, σ2=25 × 10-19cm2, L1=
0.005, L2=0.006.Plane output coupling mirror is to wavelength X1And λ2Plating reflectivity is R1=98% and R2=87% deielectric-coating.
In embodiments herein, the V-arrangement conscope plates anti-reflection film to wavelength 1342nm, and concave surface plates 1064nm high
Reflectance coating；Positive round axicon lens plates anti-reflection film to wavelength 1342nm and 1064nm；Laser gain medium plates 808nm wavelength anti-reflection
Film, while highly reflecting films are plated to wavelength 1342nm and 1064nm in right side；Plane mirror plates high reflection to 808nm wavelength
Film；The conical surface of negative conscope plates highly reflecting films to optical maser wavelength 1342nm and 1064nm.
To sum up, Laser Output Beam optical intensity on the cross section center has the concentric loop compared with Great Dark Spot size in the present invention,
And the wavelength of the inner and outer ring of concentric loop is different, increases the application prospect of hollow beam；The light beam that the laser generates can answer
Manipulated simultaneously for two microcosmic particles, different from phase-matching technique and two biological cell in space while capture etc..
It should be noted that the above is a preferred embodiment of the present invention, it should be understood that the present invention is not limited to
Form disclosed herein should not be viewed as excluding other embodiments, and can be used for other combinations, modification and environment,
And can be in contemplated scope described herein, modifications can be made through the above teachings or related fields of technology or knowledge.And ability
The modifications and changes that domain personnel are carried out do not depart from the spirit and scope of the present invention, then all should be in appended claims of the present invention
In protection scope.
Claims (7)
1. a kind of hollow laser of dual wavelength of output simultaneously, it is characterised in that: the plane including setting gradually from left to right is defeated
Coupling mirror (1), V-arrangement conscope (2), positive round axicon lens (3), laser gain medium (4), plane mirror (5) and negative conscope out
(8)；Coupling optical system (6) and semiconductor laser array (7) are provided with immediately below the plane mirror (5)；
The laser gain medium (4), positive round axicon lens (3), V-arrangement conscope (2), negative conscope (8) and plane output coupling mirror
(1) laser resonator is constituted, the right side of the laser gain medium (4) is the input mirror of laser resonator, and plane exports coupling
Close the outgoing mirror of mirror (1) as laser resonator.
2. a kind of hollow laser of dual wavelength of output simultaneously according to claim 1, it is characterised in that: the plane is defeated
Coupling mirror (1), V-arrangement conscope (2), positive round axicon lens (3), laser gain medium (4), plane mirror (5) and negative conscope out
(8) center is located on same level straight line.
3. a kind of hollow laser of dual wavelength of output simultaneously according to claim 1, it is characterised in that: the plane is anti-
The setting angle of mirror (5) is penetrated from the horizontal by 45 degree of angles, and plane mirror (5) is led with coupling optical system (6) and partly
The center of volumetric laser array (7) is located in same vertical straight line.
4. a kind of hollow laser of dual wavelength of output simultaneously according to claim 1, it is characterised in that: the V-arrangement circle
Axicon lens (2), positive round axicon lens (3) and negative conscope (8) are made of K9 glass；The angle of bus inside and outside the V-arrangement conscope (2)
Equal to the angle of positive round axicon lens (3) bus and bottom surface；The negative cone angle of the V-arrangement conscope (2) is equal to the cone angle of positive round axicon lens (3)
Angle；The positive cone angle and negative cone angle of the V-arrangement conscope (2) meet following relationship:
ω2=2 ω1-π；
Wherein, ω2For the positive angle of taper of V-arrangement conscope (2), ω1For the negative angle of taper of V-arrangement conscope (2), V-arrangement conscope
(2) it is combined with positive round axicon lens (3) and constitutes telescopic system.
5. a kind of hollow laser of dual wavelength of output simultaneously according to claim 4, it is characterised in that: the negative circular cone
The cone angle of mirror (8) and the cone angle of positive round axicon lens (3) meet following relationship:
ω3=2arcsin [ncos (ω1/2)]+3ω1-2π；
Wherein n is the refractive index of K9 glass, ω3Be negative the angle of taper of conscope (8)；ω1Be positive the cone angle angle of conscope (3)
Degree, positive round axicon lens (3), V-arrangement conscope (2) and negative conscope (8) constitute telescopic system.
6. a kind of hollow laser of dual wavelength of output simultaneously according to claim 1, it is characterised in that: the V-arrangement circle
Axicon lens (2) is to wavelength X1Anti-reflection film is plated, while the concave surface of V-arrangement conscope (2) is to wavelength X2Plate highly reflecting films；Positive round axicon lens (3) is right
Wavelength X1And λ2Plate anti-reflection film；Laser gain medium (4) plates anti-reflection film to pumping wavelength, while right side is to wavelength X1And λ2
Plate highly reflecting films；Plane mirror (5) plates highly reflecting films to pumping wavelength；The conical surface of negative conscope (8) is to wavelength X1And λ2?
Plate highly reflecting films, wherein wavelength X1、λ2Two output wavelengths of laser respectively.
7. a kind of hollow laser of dual wavelength of output simultaneously according to claim 6, it is characterised in that: the plane is defeated
Coupling mirror (1) is to wavelength X out1And λ2The reflectivity plated meets following relationship:
Wherein, R1And R2Respectively wavelength X1And λ2Reflectivity, σ1And σ2Respectively wavelength X1And λ2Emission cross section area, L1
And L2Respectively wavelength X1And λ2Passive loss.
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| CN201910066066.3A CN109510056B (en) | 2019-01-24 | 2019-01-24 | A kind of while output the hollow laser of dual wavelength |
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| CN201910066066.3A CN109510056B (en) | 2019-01-24 | 2019-01-24 | A kind of while output the hollow laser of dual wavelength |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112928588A (en) * | 2021-01-25 | 2021-06-08 | 中国科学院上海光学精密机械研究所 | Multi-wavelength laser |
| CN114284849A (en) * | 2021-12-30 | 2022-04-05 | 云南大学 | Adjustable vortex phase orthogonal cylindrical vector laser based on zoom hollow optical pump |
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| DE4424726C1 (en) * | 1994-07-13 | 1996-02-01 | Rofin Sinar Laser Gmbh | Coaxial waveguide laser with stable resonator |
| JP2002210579A (en) * | 2001-01-16 | 2002-07-30 | Nippon Steel Corp | Ripple-oscillated yag laser beam device and equipment for welding thin steel plate using the same |
| JP4589546B2 (en) * | 2000-05-31 | 2010-12-01 | 住友重機械工業株式会社 | Laser processing apparatus and processing method |
| CN109217077A (en) * | 2018-11-15 | 2019-01-15 | 云南大学 | A kind of tunable hollow laser of self-mixing |
| CN109244811A (en) * | 2018-11-15 | 2019-01-18 | 云南大学 | A kind of anti-gauss hollow laser light source of Great Dark Spot |
| CN109256670A (en) * | 2018-11-30 | 2019-01-22 | 云南大学 | A kind of hollow laser of Great Dark Spot based on gyrotropi crystal circular cone continuous rotation polarization |
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2019
- 2019-01-24 CN CN201910066066.3A patent/CN109510056B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4424726C1 (en) * | 1994-07-13 | 1996-02-01 | Rofin Sinar Laser Gmbh | Coaxial waveguide laser with stable resonator |
| JP4589546B2 (en) * | 2000-05-31 | 2010-12-01 | 住友重機械工業株式会社 | Laser processing apparatus and processing method |
| JP2002210579A (en) * | 2001-01-16 | 2002-07-30 | Nippon Steel Corp | Ripple-oscillated yag laser beam device and equipment for welding thin steel plate using the same |
| CN109217077A (en) * | 2018-11-15 | 2019-01-15 | 云南大学 | A kind of tunable hollow laser of self-mixing |
| CN109244811A (en) * | 2018-11-15 | 2019-01-18 | 云南大学 | A kind of anti-gauss hollow laser light source of Great Dark Spot |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112928588A (en) * | 2021-01-25 | 2021-06-08 | 中国科学院上海光学精密机械研究所 | Multi-wavelength laser |
| CN114284849A (en) * | 2021-12-30 | 2022-04-05 | 云南大学 | Adjustable vortex phase orthogonal cylindrical vector laser based on zoom hollow optical pump |
| CN114284849B (en) * | 2021-12-30 | 2024-01-09 | 云南大学 | Adjustable vortex phase orthogonal cylindrical column vector laser based on zooming hollow optical pumping |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191001 Termination date: 20210124 |