CN103560387A - Double-pass absorption spectral matching laser amplifier and amplifying method thereof - Google Patents
Double-pass absorption spectral matching laser amplifier and amplifying method thereof Download PDFInfo
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Abstract
The invention discloses a double-pass absorption spectral matching laser amplifier and an amplifying method thereof. The laser amplifier comprises a pump light focusing lens, a double-color coupling mirror, a polarization selecting mirror, a gain medium, a curve face double-color coupling mirror, a one fourth wave plate, a curve face total reflection mirror, a seed laser focusing lens and a total reflection mirror, wherein the polarization selecting mirror, the gain medium, the curve face double-color coupling mirror, the one-fourth wave plate and the curve face total reflection mirror are sequentially distributed on the same optical axis, and the seed laser focusing lens and the total reflection mirror are arranged in the direction parallel to the optical axis. Polarization seed laser and pump light are respectively emitted into the focus lens and enter to optical structure to be subjected to double-pass absorption and laser amplification, and after the seed laser is amplified, output laser with different seed laser polarization states is output. The amplifier and the amplifying method effectively utilize the pump light, and light-laser converting efficiency is improved.
Description
Technical field:
The present invention relates to field of lasers, particularly a kind of round trip absorbs light splitting coupling laser amplifier and amplification method thereof.
Background technology:
Laser has been widely used since nineteen sixty is invented, and it is applied to a plurality of fields, as laser radar, remote sensing, medical science, optical communication, and laser display, the fields such as laser processing.In a lot of fields, the good Laser output of high-energy hot spot pattern is to laser important requirement.
Tradition end pumped laser amplifier is one way pumping; be that pump light once passes through gain media; this laser often there will be because pump light can not effectively be absorbed and occurs that amplification efficiency is not high; this has caused the waste of energy; reduced the conversion efficiency of laser; also can cause the heating of laser medium, make to export the degradation of light simultaneously
As prior art CN10296648A, it discloses a kind of middle infrared laser of end pumping, and it adopts end pumping, and pump light once passes through gain media.This laser exists pump light absorption efficiency low, the defects such as crystal heating.In light path, increased after the optical elements such as lens, although pump light is focused on, increase optics and cause the whole optical loss of laser large, and the reliability of system has reduced.
In order to address the above problem, there is the method and apparatus that some conventional increase pump lights absorb this area at present, but it all exists shortcoming separately, causes it not to be widely used.As increase laser crystal length, and it often there will be pump light angle of divergence in crystal large, causes hot spot to become large, and axially most of region pump power density is lower to make crystal, cannot be got by effective body; Improve doping content, can make pump light absorb and strengthen, still, in most cases, because excessive concentration can make self-absorption loss, increase, amplification efficiency is reduced.Therefore how to make the laser medium can be effectively and receipts pump light, and by laser amplifier, be converted to efficiently laser and become this area technical problem urgently to be resolved hurrily.
Summary of the invention:
In order to overcome above-mentioned defect, obtain a kind of laser amplifier of high pumping efficiency, the present invention has adopted round trip to absorb light splitting coupling amplification mode, has realized the efficient conversion from pump light to laser.
The technical solution adopted for the present invention to solve the technical problems is as follows:
Absorb a light splitting coupling laser amplifier, it is characterized in that, this laser amplifier comprises:
Be positioned on same optical axis and distribute successively: pump light condenser lens (1), double-colored coupling mirror (3), polarization select mirror (5), gain media (6), the double-colored coupling mirror of curved surface (7), quarter wave plate (8) and curved surface total reflective mirror (9); And:
In the direction parallel with described optical axis, the seed light condenser lens (2) and the total reflective mirror (4) that distribute successively, seed light focus lamp (2) and total reflective mirror (4) are set to seed light by after seed light condenser lens (2), incide total reflective mirror (4) upper, after total reflective mirror (4) reflection, incided double-colored coupling mirror (3);
Pump light is after pump light condensing lens (1), and it is girdled the waist and is positioned at center of gain media (6);
Seed light is after seed light focus lamp (2), and it is girdled the waist and overlaps with pump light position with a tight waist, is positioned at the center of gain media (6);
If the double-colored coupling mirror of curved surface (7) radius of curvature is R1, curved surface total reflective mirror (9) radius of curvature is R2, the center of gain media (6) is L1 to the distance at the double-colored coupling mirror of curved surface (7) center, the center of gain media is L2 to the distance at curved surface total reflective mirror (9) center, the length of gain media (6) is d, and L1, L2, R1, R2 and d meet following numerical relation:
L1<L2，L1-d/2≤R1≤L1+d/2，L2-d/2≤R2≤L2+d/2。
Preferably, L1=R1, L2=R2.
Preferably, L1-300≤R1≤L1+300, L2-300≤R2≤L2+300.
Preferably, L1-100≤R1≤L1+100, L2-100≤R2≤L2+100.
In above-mentioned several relation, the unit of each value is mm.Preferably, the material of polarization selection mirror (5) is quartzy.
Preferably, double-colored coupling mirror (3) is 45 ° of double-colored coupling mirrors, and it is thoroughly high to pump light, high anti-to seed light.
Absorb light splitting coupling laser and put people's method, the method comprises:
On same optical axis, set gradually: pump light condenser lens (1), double-colored coupling mirror (3), polarization are selected mirror (5), gain media (6), double-colored coupling mirror (7), quarter wave plate (8) and curved surface total reflective mirror (9);
In the direction parallel with described optical axis, set gradually seed light condenser lens (2) and total reflective mirror (4); Seed light focus lamp (2) and total reflective mirror (4) are set to seed light by after seed light condenser lens (2), incide total reflective mirror (4) upper, after total reflective mirror (4) reflection, are incided double-colored coupling mirror (3);
Make pump light be incident to pump light condenser lens (1), by being incident to double-colored coupling mirror (3) after these lens, after seeing through double-colored coupling mirror (3), be incident to polarization selection mirror (5), after selecting to enter gain media (6) after mirror (5) by polarization, be partially absorbed, the pump light not being completely absorbed by gain media (6) outgoing is incident to curved surface dichroic mirror (7), after being reflected, get back to gain media (6), by gain media double absorption, curved surface dichroic mirror (7) makes the pump light returning form light beam inverible transform simultaneously;
The seed light of the first polarization is incided on total reflective mirror (4), after total reflective mirror (4) reflection, being incided double-colored coupling mirror (3) is reflected, reverberation is selected after mirror (5) by polarization, incide in gain media (6) and be exaggerated, light after amplification is by after curved surface dichroic mirror (7), by quarter-wave plate (8), after being incident to curved reflector (9), be reflected, Yan Yuan returns on road, make the light that returns form the inverible transform of light beam, reverberation is again by quarter-wave plate (8), polarization direction is compared with incident light and is produced 90 ° of rotations, after double color reflection mirror (7), incide gain media (6), by secondary, amplified, amplification light incides polarization to be selected to be totally reflected on mirror (5), export the output light of the second polarization,
If the double-colored coupling mirror of curved surface (7) radius of curvature is R1, curved surface total reflective mirror (9) radius of curvature is R2, the center of gain media (6) is L1 to the distance at the double-colored coupling mirror of curved surface (7) center, the center of gain media is L2 to the distance at curved surface total reflective mirror (9) center, the length of gain media (6) is d, and L1, L2, R1, R2 and d meet following numerical relation:
L1<L2，L1-d/2≤R1≤L1+d/2，L2-d/2≤R2≤L2+d/2。
Preferably, seed light is p polarization, and output light is s polarization.
Preferably, double-colored coupling mirror (3) and total reflective mirror (4) all can two dimension be adjusted.
Accompanying drawing explanation:
Figure: round trip absorbs light splitting coupling laser amplifier structure chart
In figure: 1. double-colored coupling mirror 4. total reflective mirror 5. polarizations of pump light condenser lens 2. seed light condenser lens 3. are selected the double-colored coupling mirror 8.1/4 wave plate 9. curved surface total reflective mirrors of mirror 6. gain media 7. curved surface
Embodiment:
Figure is that round trip of the present invention absorbs light splitting coupling laser amplifier schematic diagram.
This laser amplifier comprises: be positioned on same optical axis distribute successively with lower member: pump light condenser lens 1, double-colored coupling mirror 3, polarization are selected mirror 5, gain media 6, the double-colored coupling mirror 7 of curved surface, quarter wave plate 8 and curved surface total reflective mirror 9; In the direction parallel with described optical axis, be distributed with successively seed light condenser lens 2 and total reflective mirror 4, seed light focus lamp 2 and total reflective mirror 4 are set to seed light by after seed light condenser lens 2, incide on total reflective mirror 4, after total reflective mirror 4 reflections, are incided double-colored coupling mirror 3; If double-colored coupling mirror 7 radius of curvature of curved surface are R1, curved surface total reflective mirror 9 radius of curvature are R2, the center of gain media is L1 to the distance at the double-colored coupling mirror of curved surface 7 centers, the center of gain media is L2 to the distance at curved surface total reflective mirror 9 centers, the length of gain media 6 is d, L1<L2 now, L1-d/2≤R1≤L1+d/2, L2-d/2≤R2≤L2+d/2.
Preferably, L1=R1, L2=R2.
Its working method of this laser amplifier is as follows:
Pump light is incident to pump light condenser lens 1, by being incident to double-colored coupling mirror 3 after these lens, after seeing through double-colored coupling mirror 3, be incident to polarization selection mirror 5, after selecting to enter gain media 6 after mirror 5 by polarization, be partially absorbed, the pump light not being completely absorbed by gain media 6 outgoing is incident to 7 reflections of curved surface dichroic mirror, gets back to gain media 6 after being reflected, and again passes through gain media, by gain media, absorbed, curved surface dichroic mirror 7 makes the light returning form light beam inverible transform simultaneously.The seed light of P polarization incides on total reflective mirror 4, after total reflective mirror 4 reflections, being incided double-colored coupling mirror 3 is reflected, reverberation is selected after mirror 5 by polarization, incide in gain media 6 and be exaggerated, light after amplification is by curved surface dichroic mirror 7, pass through quarter-wave plate, after being incident to curved reflector 9, be reflected, Yan Yuan returns on road, make the light that returns form the inverible transform of light beam, reverberation is again by inciding gain media 6 after quarter-wave plate 8 and double color reflection mirror 7, by secondary, put people, putting people solely incides polarization and selects to be reflected on mirror 5, carry out exporting after polarization is selected the output light of s polarization.By making the curvature of the double-colored coupling mirror of curved surface and curved reflector meet certain numerical relation, make each self-forming inverible transform of pump light and reverberation, increased the absorption efficiency of gain media, improved the optical quality of output beam.
Double-colored coupling mirror 3 is 45 ° of double-colored coupling mirrors, thoroughly high to pump light, high anti-to seed light; Total reflective mirror 4 is 45 ° of total reflective mirrors, high anti-to seed light; Double-colored coupling mirror 3 and total reflective mirror 4 all can 2 dimensions be adjusted, by adjusting double-colored coupling mirror 3, can make through the seed light of its reflection parallel with the pump light that sees through it, by adjust total reflective mirror 4 can pump light and seed light on the reflecting surface of double-colored coupling mirror 3, intersect, by the adjustment of double-colored coupling mirror 3 and total reflective mirror 4, can easily adjust pump light and strictly overlap with seed light light path after double-colored coupling mirror 3; It is quartzy that polarization is selected mirror 5 materials, and its seed light to pump light and p polarization is thoroughly high, high anti-to the output light of s polarization; Gain media is solid state gain medium; 7 pairs of pump lights of the double-colored coupling mirror of curved surface are high anti-, thoroughly high to the light of seed light wavelength; Curved surface total reflective mirror 9 curvature are high anti-to seed light.
The above-mentioned people's of putting device and put people's method, by making pump light Multiple through then out gain media, has increased the absorption efficiency of gain media to pump light, adopts the laser of above-mentioned amplifying device, has obtained good output quality and higher output energy.
Claims (10)
1. round trip absorbs light splitting coupling laser amplifier in one, it is characterized in that, this laser amplifier comprises:
Be positioned on same optical axis and distribute successively: pump light condenser lens (1), the full mirror of double-colored coupling (3), polarization select mirror (5), gain media (6), the double-colored coupling mirror of curved surface (7), quarter wave plate (8) and curved surface total reflective mirror (9); And:
In the direction parallel with described optical axis, the seed light condenser lens (2) and the total reflective mirror (4) that distribute successively, seed light focus lamp (2) and total reflective mirror (4) are set to seed light by after seed light condenser lens (2), incide total reflective mirror (4) upper, after total reflective mirror (4) reflection, incided double-colored coupling mirror (3);
Pump light is after pump light condensing lens (1), and it is girdled the waist and is positioned at center of gain media (6);
Seed light is after seed light focus lamp (2), and it is girdled the waist and overlaps with pump light position with a tight waist, is positioned at the center of gain media (6);
If the double-colored coupling mirror of curved surface (7) radius of curvature is R1, curved surface total reflective mirror (9) radius of curvature is R2, the center of gain media (6) is L1 to the distance at the double-colored coupling mirror of curved surface (7) center, the center of gain media is L2 to the distance at curved surface total reflective mirror (9) center, the length of gain media (6) is d, and L1, L2, R1, R2 and d meet following numerical relation:
L1<L2，L1-d/2≤R1≤L1+d/2，L2-d/2≤R2≤L2+d/2。
2. a kind of laser amplifier according to claim 1, is characterized in that:
L1-300≤R≤L1+300, L2-300≤R2≤L2+300, in this numerical relation, the unit of each value is mm.
3. a kind of laser amplifier according to claim 1, is characterized in that:
L1-100≤R1≤L1+100, L2-100≤R2≤L2+100, in this numerical relation, the unit of each value is mm.
4. according to a kind of laser amplifier described in claim 1-3, it is characterized in that: polarization selects the material of mirror (5) for quartzy.
5. according to a kind of laser amplifier described in claim 1-4, it is characterized in that: double-colored coupling mirror (3) is 45 ° of double-colored coupling mirrors, it is thoroughly high to pump light, high anti-to seed light.
6. round trip absorbs a light splitting coupling laser amplification method, and the method comprises:
On same optical axis, set gradually: pump light condenser lens (1), double-colored coupling mirror (3), polarization are selected mirror (5), gain media (6), the double-colored coupling mirror of curved surface (7), quarter wave plate (8) and curved surface total reflective mirror (9);
In the direction parallel with described optical axis, set gradually seed light condenser lens (2) and total reflective mirror (4), seed light focus lamp (2) and total reflective mirror (4) are set to seed light by after seed light condenser lens (2), incide total reflective mirror (4) upper, after total reflective mirror (4) reflection, incided double-colored coupling mirror (3);
Make pump light be incident to pump light condenser lens (1), by being incident to double-colored coupling mirror (3) after these lens, after seeing through double-colored coupling mirror (3), be incident to polarization selection mirror (5), after selecting to enter gain media (6) after mirror (5) by polarization, be partially absorbed, the pump light not being completely absorbed by gain media (6) outgoing is incident to curved surface dichroic mirror (7), after being reflected, get back to gain media (6), by gain media double absorption, curved surface dichroic mirror (7) makes the pump light returning form light beam inverible transform simultaneously;
The seed light of the first polarization is incided on total reflective mirror (4), after total reflective mirror (4) reflection, being incided double-colored coupling mirror (3) is reflected, reverberation is selected after mirror (5) by polarization, incide in gain media (6) and be exaggerated, light after amplification is by curved surface dichroic mirror (7), by quarter-wave plate (8), after being incident to curved reflector (9), be reflected, Yan Yuan returns on road, make the light that returns form the inverible transform of light beam, reverberation is again by quarter-wave plate (8), after double color reflection mirror (7), incide gain media (6), by secondary, amplified, amplification light incides polarization to be selected to be totally reflected on mirror (5), export the output light of the second polarization,
If the double-colored coupling mirror of curved surface (7) radius of curvature is R1, curved surface total reflective mirror (9) radius of curvature is R2, the center of gain media (6) is L1 to the distance at the double-colored coupling mirror of curved surface (7) center, the center of gain media is L2 to the distance at curved surface total reflective mirror (9) center, the length of gain media (6) is d, and L1, L2, R1, R2 and d meet following numerical relation:
L1<L2，L1-d/2≤R1≤L1+d/2，L2-d/2≤R2≤L2+d/2。
7. laser amplification method according to claim 6,
L1-300≤R1≤L1 10, L2-300≤R2≤L2+300, and in this numerical relation, the unit of each value is mm.
8. laser amplification method according to claim 6, is characterized in that: L1-100≤R1≤L1+100, and L2-100≤R2≤L2+100, in this numerical relation, the unit of each value is mm.
9. laser amplification method according to claim 6, is characterized in that: seed light is p polarization, and output light is s polarization.
10. laser amplification method according to claim 6, is characterized in that: double-colored coupling mirror (3) and total reflective mirror (4) all can two dimension be adjusted.
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| CN107482432A (en) * | 2017-08-16 | 2017-12-15 | 中国科学院上海光学精密机械研究所 | Annular multi-pass laser amplification device |
| CN109936041A (en) * | 2019-03-18 | 2019-06-25 | 苏州贝林激光有限公司 | A kind of solid femtosecond amplifying device and its method |
| CN110521070A (en) * | 2017-04-19 | 2019-11-29 | Eo 科技股份有限公司 | Laser amplification device |
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| CN117220122A (en) * | 2023-11-07 | 2023-12-12 | 中国工程物理研究院应用电子学研究所 | Plane waveguide laser gain module and laser amplifying device for 1.3um |
| CN117220122B (en) * | 2023-11-07 | 2024-03-08 | 中国工程物理研究院应用电子学研究所 | Plane waveguide laser gain module and laser amplifying device for 1.3um |
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Application publication date: 20140205 |