CN201425689Y - Cascade bi-pass laser amplifier light path structure - Google Patents
Cascade bi-pass laser amplifier light path structure Download PDFInfo
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- CN201425689Y CN201425689Y CN2009201061488U CN200920106148U CN201425689Y CN 201425689 Y CN201425689 Y CN 201425689Y CN 2009201061488 U CN2009201061488 U CN 2009201061488U CN 200920106148 U CN200920106148 U CN 200920106148U CN 201425689 Y CN201425689 Y CN 201425689Y
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- wave plate
- laser medium
- polaroid
- quarter wave
- catoptron
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Abstract
The utility model relates to a laser amplifier light path, in particular to a light path structure designed to amplify the principal oscillating light of a laser through multiply stages, which comprises an optical isolator and an amplifying part, wherein, the optical isolator comprises a first polarizer, a 1/2 wave plate, a Faraday rotator and a second polarizer, and the amplifying part comprisesan amplifying branch circuit made up of a first laser medium, a first 1/4 wave plate and a first reflecting mirror and an amplifying support arm made up of a third polarizer, a second laser medium, asecond 1/4 wave plate, a second reflecting mirror, a third laser medium, a third 1/4 wave plate and a third reflecting mirror. When in use, the lights from the amplifying branch circuit and the amplifying support arm are coupled through the third polarizer at the center of the structure, and seed lights, after undergoing the third-stage bi-pass amplification, are reflected out by the second polarizer. The utility model ensures each laser medium is bi-pass amplified, raises the plus efficiency while suppressing the self-excitation oscillation, guarantees the beam quality of the amplified lasers, and proves convenient in the cascading of amplifying arms.
Description
Technical field
The utility model is a kind of laser amplifier light path, is specially a kind of light channel structure that laser main oscillations light is carried out multistage amplification, and this amplifier is easy to carry out multi-stage cascade, can realize multistage bilateral amplification to the laser that main oscillations produces.
Background technology
It is a kind of realization high power commonly used that the laser main oscillations is amplified, the technology of high energy laser output.At first by a laser instrument (being called king oscillator) produce function admirable than low light level signal (seed light), be injected into then and obtain light amplification in one or more levels laser amplifier.In order to obtain higher gain enlargement factor, take to increase gain media quantity usually or allow seed light repeatedly by the method for gain media, precedingly a kind ofly be called multistage single-pass and amplify, the back is a kind of to be called many logical amplifications.The single-pass amplifier only allows seed light once by gain media at present, and its utilization factor is low; And during multi-stage cascade, make hot depolarization and heat distortion be difficult to obtain fine compensation because the gain media parameter is inconsistent, when seed light was exaggerated, beam quality seriously descended.And amplify for many logical amplifications, particularly four-way, easily produce self-sustained oscillation, have a strong impact on amplification efficient.How when guaranteeing that gain media has very high utilization ratio, again can good restraining self-sustained oscillation, compensation thermal depolarization and heat distortion guarantee the problem that need consider when beam quality is design light amplification structure.
The utility model content
The purpose of this utility model is the technical characterstic at laser amplifier, the method of utilizing polarizer and laser polarization state to change, proposed a kind of be easy to cascade, simultaneously satisfy very high gain media utilization ratio is arranged, again can good restraining self-sustained oscillation, the multistage bilateral amplifier light channel structure of compensation thermal depolarization.
For achieving the above object, the utility model has been taked following technical scheme: the utility model comprises optoisolator that is used for the importing of seed light and the amplifier section that the seed light from optoisolator output is amplified.Described optoisolator comprises first polaroid, 1/2 wave plate, Faraday rotator and second polaroid of placing successively along the seed optical propagation direction.Described amplifier section comprises amplification branch road of being made up of first laser medium, first quarter wave plate, first catoptron and the amplification support arm of being made up of the 3rd polaroid, second laser medium, second quarter wave plate, second catoptron, the 3rd laser medium, the 3rd quarter wave plate and the 3rd catoptron.Amplify first laser medium in the branch road, first quarter wave plate and first catoptron set gradually along optoisolator output optical propagation direction, amplifying the 3rd polaroid in the support arm is placed on second polaroid and amplifies between first laser medium in the branch road, the 3rd polaroid tiltedly below a side be placed with second laser medium successively, second quarter wave plate and second catoptron, oblique upper one side is placed with the 3rd laser medium successively, the 3rd quarter wave plate and the 3rd catoptron, and the 3rd polaroid, second laser medium, second quarter wave plate, second catoptron, the 3rd laser medium, the 3rd quarter wave plate and the 3rd catoptron are in same optical axis.Angle between the optical axis of the optical axis of amplification branch road and amplification support arm is
All polaroids satisfy light Brewster angle θ incident.
The number of the amplification support arm that is provided with between second polaroid and first laser medium is 1～5, and when the number of amplifying support arm was 2-5, each optical axis that amplifies support arm was arranged in parallel.
The quarter wave plate that amplifies branch road and amplify in the support arm can be replaced by 45 ° of Faraday rotators.
Compare with existing structure, the utlity model has following advantage: guaranteed that 1) each laser medium all is that bilateral is amplified, and has improved gain efficiency; 2) since light in amplification process, the continuous variation of polarization state has reasonably compensated the thermal depolarization effect of laser medium, has guaranteed the beam quality of amplifying laser; 3), make that laser is difficult to realize directly coming and going between catoptron, thereby suppress self-sustained oscillation because the continuous variation of polarization state; When laser during because of the thermal depolarization of multimode running or the too high generation of energy, the light that depolarization is shaken can enter optoisolator along primary optical axis, from polaroid 1 reflection and go out, and not can and catoptron between form and repeatedly come and go, suppressed self-oscillatory generation from another point of view; 4) gain amplifier higher as needs can amplify support arm cascade (seeing accompanying drawing 2) easily; 5) compact conformation.
Description of drawings
Fig. 1 is first structural representation of the present utility model
Among the figure: 1, first polaroid, 2,1/2 wave plate, 3,45 ° of Faraday rotators, 4, second polaroid, the 5, the 3rd polaroid, 6, first laser medium, 7, first quarter wave plate, 8, first catoptron, 9, second laser medium, 10, second quarter wave plate, 11, second catoptron, 12, the 3rd laser medium, the 13, the 3rd quarter wave plate, the 14, the 3rd catoptron
Fig. 2 is second structural representation of the present utility model
Among the figure: a is the first amplification support arm, comprises 5 among Fig. 1,9,10,11,12,13,14 elements
B amplifies support arm for second of expansion, and structure is identical with a
C amplifies support arm for the 3rd of expansion, and structure is identical with a
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
As shown in Figure 1, present embodiment comprises optoisolator that is used for the importing of seed light and the amplifier section that the seed light from optoisolator output is amplified.Optoisolator comprises first polaroid, 1,1/2 wave plate 2, Faraday rotator 3 and second polaroid of placing successively along the seed optical propagation direction 4.Amplifier section comprises amplification branch road of being made up of first laser medium 6, first quarter wave plate 7, first catoptron 8 and the amplification support arm of being made up of the 3rd polaroid 5, second laser medium 9, second quarter wave plate 10, second catoptron 11, the 3rd laser medium 12, the 3rd quarter wave plate 13 and the 3rd catoptron 14.First laser medium 6, first quarter wave plate 7 and first catoptron 8 that amplify in the branch road set gradually along optoisolator output optical propagation direction, amplify the 3rd polaroid 5 in the support arm and be placed on second polaroid 4 and amplify between first laser medium 6 in the branch road, and 2,45 ° of Faraday rotators of first polaroid, 1,1/2 wave plate 3, second polaroid 4, the 3rd polaroid 5, first laser medium 6, first quarter wave plate 7, first completely reflecting mirror 8 are on the same optical axis.The 3rd polaroid 5 tiltedly below a side be placed with second laser medium 9, second quarter wave plate 10 and second catoptron 11 successively according to direction away from the 3rd polaroid 5, oblique upper one side is placed with the 3rd laser medium 12, the 3rd quarter wave plate 13 and the 3rd catoptron 14 successively according to the direction away from the 3rd polaroid 5, and the 3rd polaroid 5, second laser medium 9, second quarter wave plate 10, second catoptron 11, the 3rd laser medium 12, the 3rd quarter wave plate 13 and the 3rd catoptron 14 are in same optical axis.Amplification branch road and three polaroid 5 couplings of the light that amplifies support arm by structure centre, the angle between the optical axis of the optical axis of amplification branch road and amplification support arm is
All polaroids satisfy light Brewster angle θ incident.Seed light is from the incident of Fig. 1 left end, after amplifying through three grades of bilaterals, by 4 reflections of second polaroid and go out.
Seed light by the king oscillator generation, must be the horizontal direction polarized light, as shown in Figure 1, from left end with the brewster angle incidence of this wavelength to first polaroid 1, process is by 1/2 wave plate 2,45 ° of Faraday rotators 3, incide the 3rd polaroid 5 behind the optoisolator that second polaroid 4 is formed, continue to be transmitted to first laser medium 6 and carry out first order amplification, then through becoming circularly polarized light behind first quarter wave plate 7, return once more behind first catoptron 8 and become vertical polarized light through first quarter wave plate 7, carrying out the first order through first laser medium 6 amplifies once more, to the 3rd polaroid 5, reflex to second laser medium 9 and carry out second level amplification, by becoming circularly polarized light behind second quarter wave plate 10, incide again on second catoptron 11, return second quarter wave plate and become horizontal polarization light, carrying out the second level by second laser medium 9 amplifies once more, being transmitted to the 3rd laser medium 12 behind the 3rd polaroid 5 carries out the third level and amplifies, incide the 3rd quarter wave plate 13 afterwards and become circularly polarized light, incide the 3rd catoptron 14 again, become the vertical direction polarized light through the 3rd quarter wave plate 13 after returning, amplify once more carrying out the third level through the 3rd laser medium 12, incide reflection on the 3rd polaroid 5 again, secondary reflection again to second polaroid 4, finishing amplification process to this, is that three bilaterals are amplified altogether.Higher if desired gain amplifier can amplify the support arm expansion, and present embodiment has selected for use three to amplify support arms, has promptly added second, third (optional) and has amplified support arm, and as shown in Figure 2, and the optical axis that respectively amplifies support arm is arranged in parallel.Annotate: when laser makes quarter wave plate change whole polarization state of light because of the thermal depolarization of multimode running or the too high generation of energy is serious, be in the interchangeable Faraday rotator at 45 of quarter wave plate (as 7,10,13 in the accompanying drawing 1) between laser medium and catoptron.
Claims (3)
1, light path structure for cascade bi-pass laser amplifier comprises optoisolator that is used for the importing of seed light and the amplifier section that the seed light from optoisolator output is amplified; Described optoisolator comprises first polaroid (1), 1/2 wave plate (2), Faraday rotator (3) and second polaroid of placing successively along the seed optical propagation direction (4); It is characterized in that: described amplifier section comprises amplification branch road of being made up of first laser medium (6), first quarter wave plate (7), first catoptron (8) and the amplification support arm of being made up of the 3rd polaroid (5), second laser medium (9), second quarter wave plate (10), second catoptron (11), the 3rd laser medium (12), the 3rd quarter wave plate (13) and the 3rd catoptron (14); Amplify first laser medium (6) in the branch road, first quarter wave plate (7) and first catoptron (8) set gradually along optoisolator output optical propagation direction, amplifying the 3rd polaroid (5) in the support arm is placed between first laser medium (6) in second polaroid (4) and the amplification branch road, a side is placed with second laser medium (9) successively in the oblique below of the 3rd polaroid (5), second quarter wave plate (10) and second catoptron (11), oblique upper one side is placed with the 3rd laser medium (12) successively, the 3rd quarter wave plate (13) and the 3rd catoptron (14), and the 3rd polaroid (5), second laser medium (9), second quarter wave plate (10), second catoptron (11), the 3rd laser medium (12), the 3rd quarter wave plate (13) and the 3rd catoptron (14) are in same optical axis; Angle between the optical axis of the optical axis of amplification branch road and amplification support arm is
All polaroids satisfy light Brewster angle θ incident.
2, light path structure for cascade bi-pass laser amplifier according to claim 1 is characterized in that: the number of the amplification support arm that is provided with between second polaroid (4) and first laser medium (6) is 1-5; When the number of amplifying support arm was 2-5, each optical axis that amplifies support arm was arranged in parallel.
3, according to claim 1 or the described light path structure for cascade bi-pass laser amplifier of claim 2, it is characterized in that: the quarter wave plate that amplifies in branch road and the amplification support arm can be replaced by 45 ° of Faraday rotators.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201061488U CN201425689Y (en) | 2009-03-13 | 2009-03-13 | Cascade bi-pass laser amplifier light path structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201061488U CN201425689Y (en) | 2009-03-13 | 2009-03-13 | Cascade bi-pass laser amplifier light path structure |
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| CN201425689Y true CN201425689Y (en) | 2010-03-17 |
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| CN2009201061488U Expired - Fee Related CN201425689Y (en) | 2009-03-13 | 2009-03-13 | Cascade bi-pass laser amplifier light path structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570261A (en) * | 2011-02-25 | 2012-07-11 | 北京国科世纪激光技术有限公司 | Self-adjusting resonant cavity and regeneration laser amplifier with resonant cavity |
| CN103001108A (en) * | 2012-12-03 | 2013-03-27 | 华中科技大学 | Excimer laser regeneration type amplifier |
-
2009
- 2009-03-13 CN CN2009201061488U patent/CN201425689Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570261A (en) * | 2011-02-25 | 2012-07-11 | 北京国科世纪激光技术有限公司 | Self-adjusting resonant cavity and regeneration laser amplifier with resonant cavity |
| CN103001108A (en) * | 2012-12-03 | 2013-03-27 | 华中科技大学 | Excimer laser regeneration type amplifier |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100317 Termination date: 20110313 |