CN109659803A - A kind of rotational symmetry polarization hollow laser of the adjustable polarization direction of high polarization purity - Google Patents
A kind of rotational symmetry polarization hollow laser of the adjustable polarization direction of high polarization purity Download PDFInfo
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- CN109659803A CN109659803A CN201910065979.3A CN201910065979A CN109659803A CN 109659803 A CN109659803 A CN 109659803A CN 201910065979 A CN201910065979 A CN 201910065979A CN 109659803 A CN109659803 A CN 109659803A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08059—Constructional details of the reflector, e.g. shape
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
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Abstract
The invention discloses a kind of rotational symmetry polarization hollow lasers of high adjustable polarization direction of polarization purity, including negative conscope (1), positive round axicon lens (2), laser gain medium (3), plane mirror (4), gyrotropi crystal normal cone (7) and the negative circular cone of gyrotropi crystal (8) set gradually；Coupling optical system (5) and semiconductor laser array (6) are provided with below plane mirror (4)；Laser gain medium (3), positive round axicon lens (2), negative conscope (1), gyrotropi crystal normal cone (7) and the negative circular cone of gyrotropi crystal (8) constitute laser resonator, the right side of laser gain medium (3) is the input mirror of laser resonator, output coupling mirror of the negative circular cone of gyrotropi crystal (8) as laser resonator.The present invention has Laser Output Beam optical intensity on the cross section center compared with Great Dark Spot size, and polarisation distribution is in rotational symmetry distribution and polarization direction is continuously adjusted, and improves the polarization purity and beam quality of hollow laser beam.
Description
Technical field
The present invention relates to laser technology fields, more particularly to a kind of rotational symmetry of high adjustable polarization direction of polarization purity
Polarization hollow laser.
Background technique
Rotational symmetry polarised light is a kind of non-uniform polarisation light, and polarization direction is distributed as rotating along beam cross-section
It is symmetrical.In beam center due to there are position mutually odd height and polarization singular point, beam center intensity is zero.Rotation pair
Claim polarised light specific intensity distribution and non-uniform polarisation distribution allow to for laser machining, surface plasma excitation and
In the micro- equal application of near-field scan.
Grown up the various methods for obtaining rotational symmetry polarised light at present, mainly there is intracavitary method and the outer method of chamber.Chamber
Interior method is that the polarization selection element such as circular grating lens or birefringece crystal is arranged in laser resonator to keep laser directly defeated
Rotational symmetry polarised light out, intracavitary polarization selection element production is complicated, and stability is poor, and obtains the purity of deviation light not
It is high.The outer method of chamber mainly passes through the methods of higher order mode, optics coherence tomography and the liquid crystal torsion of excitation waveguide, and linearly polarized light or circle is inclined
Vibration light is converted into rotational symmetry polarised light, these method complex manufacturing technologies, transformation efficiency is low, and obtains the purity of polarised light
It is not ideal enough.In addition, the above method can only obtain the light beam in a rotational symmetry direction, light beam polarization direction cannot be continuous
It adjusts, has seriously affected the flexibility of light beam application.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of rotations of high adjustable polarization direction of polarization purity
Turn the hollow laser of symmetric polarized, makes Laser Output Beam optical intensity on the cross section center to having compared with Great Dark Spot size, polarization divides
Cloth is in rotational symmetry distribution and polarization direction is continuously adjusted, and effectively increases the polarization purity and beam quality of hollow laser beam.
The purpose of the present invention is achieved through the following technical solutions: a kind of rotation of the high adjustable polarization direction of polarization purity
Turn the hollow laser of symmetric polarized, including the negative conscope, positive round axicon lens, laser gain medium, flat set gradually from left to right
Face reflecting mirror, gyrotropi crystal normal cone and the negative circular cone of gyrotropi crystal；Coupling optical is provided with immediately below the plane mirror
System and semiconductor laser array；
The laser gain medium, positive round axicon lens, negative conscope, gyrotropi crystal normal cone and the negative circular cone of gyrotropi crystal are constituted
Laser resonator, the right side of laser gain medium are the input mirror of laser resonator, and the negative circular cone of gyrotropi crystal is humorous as laser
The output coupling mirror of vibration chamber；The pump light that pump beam issues is passed through pump light by plane mirror by coupling optical system
End pumping mode is coupled in gain media, and laser generation is generated in resonant cavity after reaching laser threshold.
Preferably, the negative conscope, positive round axicon lens, laser gain medium, plane mirror, gyrotropi crystal normal cone and
The center of the negative circular cone of gyrotropi crystal is located on same level straight line；The setting angle and horizontal direction of the plane mirror are in 45
Angle is spent, and the center of plane mirror, coupling optical system and semiconductor laser array is located in same vertical straight line.
Preferably, the cone angle beta of the negative conscope=2 θB, cone angle=π -2 θ of positive round axicon lensB, wherein θBExist for light beam
The incidence angle of positive round axicon lens bus, the incidence angle are Brewster's angle, are combined by positive and negative circular cone and constitute telescopic system: intracavitary to swash
Light beam is incident on the bus of positive round axicon lens, as cone angle=π -2 θ of positive round axicon lensB, light beam is anti-through one bus of positive round axicon lens
The light beam penetrated is linearly polarized light (S wave), and entire 2 side π is looked up and (rotated a circle), the polarization from the reflected light of all buses is
Symmetrically；As cone angle beta=2 θ of negative conscopeB, positive and negative conscope combination constitutes telescopic system, by rotational symmetry polarised light
Transformation is horizontally；When the cone angle of the cone angle of gyrotropi crystal normal cone and the negative circular cone of optically-active is equal, rotational symmetry polarizes empty
Heart light beam is exported in parallel by the bottom surface of the negative circular cone of gyrotropi crystal.
Preferably, the gyrotropi crystal normal cone and the negative circular cone of gyrotropi crystal are made of quartz crystal, and gyrotropi crystal is just
The optical axis of circular cone and the negative circular cone of gyrotropi crystal is perpendicular to respective bottom surface；The positive cone angle and gyrotropi crystal of gyrotropi crystal normal cone are negative
The negative cone angle of circular cone is equal, and between 30 ° -60 °；According to the optically-active characteristic of crystal, when certain wavelength polarised light along
When gyrotropi crystal optical axis direction passes through, vibration plane can rotate an angle, and the angle that light vector turns over passes through substance with this
Apart from directly proportional；When adjusting the distance between gyrotropi crystal normal cone and the negative circular cone of optically-active, pass through gyrotropi crystal normal cone
The sum of cone angle and the negative cone-distance of optically-active can just change, so as to change the polarization direction of outgoing hollow beam.Work as edge
When axis adjusts negative conscope, the polarization direction of rotational symmetry light beam also can consecutive variations.
Preferably, the conical surface of the negative conscope plates highly reflecting films to optical maser wavelength；The conical surface of positive round axicon lens not plated film, institute
It states laser gain medium and anti-reflection film is plated to pumping wavelength, while high reflection is plated to optical maser wavelength in the right side of laser gain medium
Film；The plane mirror plates highly reflecting films to pumping wavelength；The gyrotropi crystal normal cone plates anti-reflection film to optical maser wavelength；Institute
The conical surface for stating the negative circular cone of gyrotropi crystal plates anti-reflection film, deielectric-coating of the bottom surface to optical maser wavelength plating 10% to optical maser wavelength.
The beneficial effects of the present invention are: output beam optical intensity on the cross section of the present invention center to have compared with Great Dark Spot size, partially
Vibration distribution is distributed in rotational symmetry and polarization direction is continuously adjustable, effectively increases the polarization purity and light beam matter of hollow laser
Amount.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of laser of the present invention；
Fig. 2 is high polarization purity Great Dark Spot optically-active rotational symmetry polarization sections schematic diagram；
Fig. 3 is the schematic diagram of adjustable rotary symmetric polarized light beam polarization direction；
Fig. 4 is negative conscope schematic cross-section；
Fig. 5 is positive conscope schematic cross-section；
In figure, the negative conscope of 1-, 2- positive round axicon lens, 3- laser gain medium, 4- plane mirror, 5- coupling optical system
System, 6- semiconductor laser array, 7- gyrotropi crystal normal cone, the negative circular cone of 8- gyrotropi crystal.
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 rotational symmetry polarization hollow laser of the adjustable polarization direction of high polarization purity, including from a left side
Negative conscope 1, positive round axicon lens 2, laser gain medium 3, plane mirror 4,7 and of gyrotropi crystal normal cone set gradually to the right side
The negative circular cone 8 of gyrotropi crystal；The underface of the plane mirror 4 is provided with coupling optical system 5 and semiconductor laser array 6；
The laser gain medium 3, positive round axicon lens 2, negative conscope 1, gyrotropi crystal normal cone 7 and the negative circular cone 8 of gyrotropi crystal constitute and swash
Optical cavity, the right side of laser gain medium 3 are the input mirror of laser resonator, and the negative circular cone 8 of gyrotropi crystal is humorous as laser
The output coupling mirror of vibration chamber.
Wherein, the negative conscope 1, positive round axicon lens 2, laser gain medium 3, plane mirror 4, gyrotropi crystal normal cone
7 and the center of the negative circular cone 8 of gyrotropi crystal be located on same level straight line；The setting angle of the plane mirror 4 and level side
To being in 45 degree angles, and the center of plane mirror 4, coupling optical system 5 and semiconductor laser array 6 be located at it is same it is vertical directly
On line.
Wherein, the cone angle beta of the negative conscope 1=2 θB, cone angle=π -2 θ of positive round axicon lens 2B, wherein θBExist for light beam
The incidence angle of 2 bus of positive round axicon lens, the incidence angle are Brewster's angle, are combined by positive and negative circular cone and constitute telescopic system.
Endovenous laser beam is incident on the bus of positive round axicon lens 2, as cone angle=π -2 θ of positive round axicon lens 2B, light beam is through just
The light beam of 2 one buses of conscope reflection is linearly polarized light S wave, is looked up to entire 2 side π, from all 2 buses of positive round axicon lens
The polarization of reflected light is that rotational symmetry polarizes；As cone angle beta=2 θ of negative conscope 1B, positive round axicon lens 2 and negative conscope 1 combine structure
At telescopic system, horizontally by the direction of propagation transformation of rotational symmetry light beam；Rotational symmetry polarised light passes through optically-active
Crystal normal cone 7 and the negative circular cone 8 of gyrotropi crystal, when the cone angle of the cone angle of gyrotropi crystal normal cone 7 and the negative circular cone 8 of optically-active is equal
When, the negative circular cone bottom surface of rotational symmetry light beam gyrotropi crystal exports in parallel, output beam cross-sectional view as shown in Fig. 2,
The characteristics of light beam is that the cross section of light beam has larger hollow area, the polarization direction of light beam is rotational symmetry polarization, light beam tool
There is the polarization direction of high polarization purity and light beam to continuously adjust.
As shown in figure 3, being the schematic diagram of adjustable rotary symmetric polarized light beam polarization direction, the calculating process of principle is as follows:
If the cone angle of gyrotropi crystal positive round axicon lens 7 and the negative conscope 8 of gyrotropi crystal is γ, the bottom surface and top of gyrotropi crystal positive round axicon lens 7
Point arrive respectively light beam and its bus intersection point along wheelbase from for l0And l1, the beam radius on 7 bottom surface of gyrotropi crystal positive round axicon lens is
ω1, the beam radius on negative 8 bus of conscope of gyrotropi crystal is ω2, the vertex of the negative conscope 8 of gyrotropi crystal to light beam and it is female
Line intersection point along wheelbase from for l2, the distance on the vertex of the negative conscope 8 of gyrotropi crystal to bottom surface is d, light beam through gyrotropi crystal just
Conscope 7 with the angle of horizontal axis is ρ after reflecting, and is A, A point to the bottom of the negative conscope 8 of gyrotropi crystal with the intersection point of axis
Identity distance is from for l3.The deflection angle ρ of conscope 7 are as follows:
It can be obtained according to geometrical relationship
(3) formula substitution (2) formula is obtained
(4) and (5) formula are substituted into (6) formula to obtain
(1) formula substitution (7) formula is obtained
Therefore, light beam passes through distance L=l in the negative conscope 8 of gyrotropi crystal in gyrotropi crystal positive round axicon lens 70+d+l2。
According to the optically-active characteristic of crystal, when the polarised light of certain wavelength passes through along gyrotropi crystal optical axis direction, vibration plane can turn
An angle is moved, the angle that light vector turns over was directly proportional by substance distance L with this；When along the axis adjusting negative circular cone of gyrotropi crystal
When, l2It can change, and then L is caused to change, so that the polarization direction of outgoing beam can be changed.
In embodiments herein, pumping wavelength (the i.e. output light wavelength of pumping source, that is, semiconductor laser array
6 output light wavelength) it is 808nm, optical maser wavelength (output light wavelength of i.e. entire laser) is 1064nm, specifically, described
Pumping source uses output wavelength for the semiconductor laser of 808nm fiber-coupled diode array；Coupling optical system 7 uses core
The optical fiber that diameter the is 400 μm plano-convex lens composition opposite with a pair of of convex surface, is injected pump power by end pumping mode
Into laser gain medium 3, specifically, pumping source is impinged perpendicularly on pump light in two plano-convex lens by optical fiber, pumping
After light after plano-convex lens by coupling, pump light is reflected in injection laser gain medium 3 through plane mirror 4；Laser gain
Medium 3 is using Φ 6mm × 3mm, the yttrium-aluminium-garnet Nd:YAG crystal of the neodymium ion doped concentration of 1.0at.%；To pumping source and
Nd:YAG carries out TEC refrigeration, and temperature is controlled in 15 ° of ± 0.5 ° of ranges；3 light pass surface of laser gain medium plates anti-reflection film to 808nm,
Highly reflecting films are plated to 1064nm as the input mirror of resonant cavity in right side simultaneously；As shown in figure 4, negative conscope 1 is made of K9 glass,
Its cone angle beta=115.8 °, basal diameter d1The conical surface of=50mm, negative conscope 1 plate highly reflecting films to 1064nm wavelength；Such as Fig. 5
Shown, positive round axicon lens 2 is made of K9 glass, cone angle=64.2 °, basal diameter d2=10mm, the conical surface of positive round axicon lens 2 is not
Plated film；Laser gain medium 3 plates anti-reflection film to 808nm wavelength, while highly reflecting films are plated to 1064nm wavelength in right side；Plane is anti-
It penetrates mirror 4 and highly reflecting films is plated to 808nm wavelength；Gyrotropi crystal normal cone 7 and gyrotropi crystal normal cone 8 are made of quartz crystal,
Optical axis is each perpendicular to bottom surface, and positive and negative cone angle gamma is 120 °.Gyrotropi crystal normal cone 7 plates anti-reflection film to 1064nm wavelength；Optically-active
The conical surface of the negative circular cone of crystal plates anti-reflection film, deielectric-coating of the bottom surface to 1064nm wavelength plating 10% to 1064nm wavelength.
To sum up, output beam optical intensity on the cross section of the present invention center is to having compared with Great Dark Spot size, and polarisation distribution is in rotation pair
Claim distribution and polarization direction is continuously adjustable, effectively increases the polarization purity and beam quality of hollow laser；The laser produces
Raw light beam can be used for optical acquisition, optics imprison, microcosmic particle manipulation, two-photon fluorescence imaging, laser boring and welding etc.
In field.
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 (10)
1. a kind of rotational symmetry polarization hollow laser of the adjustable polarization direction of high polarization purity, it is characterised in that: including from a left side
Negative conscope (1), positive round axicon lens (2), laser gain medium (3), the plane mirror (4), gyrotropi crystal set gradually to the right side
Normal cone (7) and the negative circular cone of gyrotropi crystal (8)；Be provided with immediately below the plane mirror (4) coupling optical system (5) and
Semiconductor laser array (6)；
The laser gain medium (3), positive round axicon lens (2), negative conscope (1), gyrotropi crystal normal cone (7) and gyrotropi crystal are negative
Circular cone (8) constitutes laser resonator, and the right side of laser gain medium (3) is the input mirror of laser resonator, and gyrotropi crystal is negative
Output coupling mirror of the circular cone (8) as laser resonator.
2. a kind of rotational symmetry polarization hollow laser of high adjustable polarization direction of polarization purity according to claim 1,
It is characterized by: the negative conscope (1), positive round axicon lens (2), laser gain medium (3), plane mirror (4), gyrotropi crystal
The center of normal cone (7) and the negative circular cone of gyrotropi crystal (8) is located on same level straight line.
3. a kind of rotational symmetry polarization hollow laser of high adjustable polarization direction of polarization purity according to claim 3,
It is characterized by: the setting angle of the plane mirror (4) and horizontal direction are in 45 degree of angles, and plane mirror (4), coupling
The center for closing optical system (5) and semiconductor laser array (6) is located in same vertical straight line.
4. a kind of rotational symmetry polarization hollow laser of high adjustable polarization direction of polarization purity according to claim 1,
It is characterized by: cone angle beta=2 θ of the negative conscope (1)B, cone angle=π -2 θ of positive round axicon lens (2)B, wherein θBFor light beam
In the incidence angle of positive round axicon lens (2) bus, which is Brewster's angle, is combined by positive and negative circular cone and constitutes telescopic system.
5. a kind of rotational symmetry polarization hollow laser of high adjustable polarization direction of polarization purity according to claim 1,
It is characterized by: the gyrotropi crystal normal cone (7) and the negative circular cone of gyrotropi crystal (8) are made of quartz crystal, gyrotropi crystal
The optical axis of normal cone (7) and the negative circular cone of gyrotropi crystal (8) is perpendicular to respective bottom surface；The positive cone angle of gyrotropi crystal normal cone (7)
It is equal with the negative cone angle of the negative circular cone of gyrotropi crystal (8), and between 30 ° -60 °.
6. a kind of rotational symmetry polarization hollow laser of high adjustable polarization direction of polarization purity according to claim 1,
It is characterized by: the conical surface of the negative conscope (1) plates highly reflecting films to optical maser wavelength.
7. a kind of rotational symmetry polarization hollow laser of high adjustable polarization direction of polarization purity according to claim 1,
It is characterized by: the laser gain medium (3) plates anti-reflection film, while the right side of laser gain medium (3) to pumping wavelength
Highly reflecting films are plated to optical maser wavelength.
8. a kind of rotational symmetry polarization hollow laser of high adjustable polarization direction of polarization purity according to claim 1,
It is characterized by: the plane mirror (4) plates highly reflecting films to pumping wavelength.
9. a kind of rotational symmetry polarization hollow laser of high adjustable polarization direction of polarization purity according to claim 1,
It is characterized by: the gyrotropi crystal normal cone (7) plates anti-reflection film to optical maser wavelength.
10. a kind of rotational symmetry polarization hollow laser of high adjustable polarization direction of polarization purity according to claim 1,
It is characterized by: the conical surface of the negative circular cone of gyrotropi crystal (8) plates anti-reflection film to optical maser wavelength, optical maser wavelength is plated in bottom surface
10% deielectric-coating.
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| CN201910065979.3A CN109659803B (en) | 2019-01-24 | 2019-01-24 | high-polarization-purity polarization-direction-adjustable rotationally-symmetric polarization hollow laser |
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| CN201910065979.3A CN109659803B (en) | 2019-01-24 | 2019-01-24 | high-polarization-purity polarization-direction-adjustable rotationally-symmetric polarization hollow laser |
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| CN109659803B CN109659803B (en) | 2019-12-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10226280A1 (en) * | 2002-06-13 | 2004-01-08 | Joachim Franek | Beam guidance element has reflective surfaces for generating hollow beam from solid beam (or vice-versa) has odd number of reflective surfaces used for beam deflection |
| 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 |
-
2019
- 2019-01-24 CN CN201910065979.3A patent/CN109659803B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10226280A1 (en) * | 2002-06-13 | 2004-01-08 | Joachim Franek | Beam guidance element has reflective surfaces for generating hollow beam from solid beam (or vice-versa) has odd number of reflective surfaces used for beam deflection |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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