CN100486063C - High power pulsed laser maladjustment proof resonant cavity - Google Patents
High power pulsed laser maladjustment proof resonant cavity Download PDFInfo
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- CN100486063C CN100486063C CNB2006101245923A CN200610124592A CN100486063C CN 100486063 C CN100486063 C CN 100486063C CN B2006101245923 A CNB2006101245923 A CN B2006101245923A CN 200610124592 A CN200610124592 A CN 200610124592A CN 100486063 C CN100486063 C CN 100486063C
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- right angle
- resonant cavity
- surface speculum
- maladjustment
- high power
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Abstract
This invention discloses one high power impulse laser anti-lose resonance chamber, which comprises total reflection lens, plane output lens and laser work medium, wherein, the total reflection lens is composed of right angle inner and outer tamper surfaces; the reflection lens is combination of right angle outer tamper reflection lens and right angle round inside surface; these two reflection lens center axis are overlapped with height of outer round tamper larger than that of inner round reflection lens for around 2mm.
Description
Technical field
The present invention relates to a kind of laserresonator.
Background technology
Subject matter in the superlaser device design is, how to obtain the transverse mode distinguishing ability that big as far as possible mode volume is become reconciled, and realizing the running of high-energy single mode, thereby can extract energy expeditiously from activated material, can keep high beam quality again.
Laserresonator commonly used has stable cavity, unsteady cavity and critical resonator.
The major advantage of stable cavity is that loss is extremely low.In all stable cavities, how much deviation losses of paraxial ray are zero, and as long as the Fresnel in chamber is not too little, diffraction loss is also little of usually ignoring.But stable cavity also has its inherent shortcoming: (1) mode volume is little.Usually only account for the very little part of whole active medium volume for typical stable cavity laser basic mode volume.In fact, Gauss's basic mode of stable cavity is in the near axis of activated material just as an elongated belt, and most of activation energy all can not be converted into the laser energy of Gauss's basic mode effectively.It is worthy of note especially, the stable cavity bigger to the Fresnel number, the lateral dimension in spot radius and fundamental mode volume and chamber (it is determined by the diameter of gas discharge tube or solid laser rod usually) is irrelevant.Therefore, when the long timing in chamber, we can not increase fundamental mode volume with the way of the lateral dimension that increases activated material, thereby improve the power output of laser.On the contrary, the lateral dimension of activated material is big more, and the usage factor of operation material is low more.(2) when the Fresnel in chamber is big, the diffraction loss of some lower-order transverse modes is all little of can ignoring, thereby in fact resonant cavity also just lost the transverse mode selective power, and this will cause the multimode running inevitably, thus the reduction beam quality.Stable cavity runs on the multimode state can increase mode volume, thereby improves the usage factor of activated material and increase power output.Because the stable cavity mode volume increases with the order of mould, when enough Hermitian Gausses (or Laguerre Gauss) mould forms concussion, can improve effective usage factor of activated material, but at this moment beam quality will be more very different than basic mode light beam.
Unsteady cavity and critical resonator can guarantee to extract energy effectively from activated material and can obtain high-quality output beam simultaneously.The most frequently used unsteady cavity is a pseudo confocal unsteady resonator.It is made up of a concave mirror and a convex mirror.The real focus of concave mirror and the virtual focus of convex mirror overlap, and public focus is outside the chamber.By selecting the size of speculum, plane wave will pass through whole operation materials effectively.At this moment the utilization ratio of activated material is the highest and can obtain collimation, uniformly output beam.To its far-field pattern of circular mirror chamber be exactly one by the even diffraction pattern of the annulus of illumination of plane wave.The weak point of pseudo confocal unsteady resonator is exactly that the Energy distribution of circular ring diffraction pattern will have suitable Energy distribution around on the bright ring with respect to diffraction from circular aperture, and the far field Energy distribution is concentrated inadequately.The adjustment process complexity of pseudo confocal unsteady resonator requires high.
Plane-parallel resonator is made up of a plane total reflective mirror and a flat output mirror.Two level crossings are parallel to each other.Export even collimated light beam.The major advantage in average chamber is: beam divergence angle is little, and mode volume is bigger.Than being easier to obtain single-mode oscillation.Its major defect is to adjust the high and easy imbalance of required precision.The harsh depth of parallelism and optical cavity stability requirement have seriously limited its application.
Application number 200610018552.0 discloses a kind of " tuning laser resonance cavity ", and this laserresonator total reflective mirror is combined to form by the lateral surface of right angle, a center inner conical surface and a right angle round platform and the medial surface of a right angle round platform, uses flat output mirror.This laserresonator can be eliminated the influence of gain media uneven distribution, and the area of compression output laser facula realizes having the special ring-shaped light spot output of center spot.But this total reflective mirror is combined to form by three conical reflectors, and complex structure requires the inside and outside conical reflector in three right angles coaxial in the use, and processing and manufacturing is difficulty relatively.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art part, a kind of high power pulsed laser maladjustment proof resonant cavity is provided, this resonant cavity not only anti-imbalance ability is strong, can eliminate the influence of gain media uneven distribution, have high thermal stability, improve beam quality, and it is simple in structure, processing and manufacturing is easy, does not have the center focal line, therefore can be used for high energy pulse laser.
For achieving the above object, the technical solution used in the present invention is: a kind of high power pulsed laser maladjustment proof resonant cavity, comprise completely reflecting mirror, flat output mirror and laser working medium, completely reflecting mirror is the combination of right angle outer conical surface speculum and right angle round platform medial surface speculum, the central axes of these two speculums, the height of right angle outer conical surface speculum are greater than the height of right angle round platform medial surface speculum, and its difference in height is less than or equal to 2mm greater than zero.
The present invention compared with prior art has the following advantages:
(1) in the present invention, the height of right angle outer conical surface speculum is greater than the height of right angle round platform medial surface speculum, so high power pulsed laser maladjustment proof resonant cavity of the present invention does not have the center focal line, avoided the air on focal line breakdown, can be used for the macro-energy pulse laser; And, improved the ability of the anti-pulse light laser damage in the top position of outer conical surface speculum, right angle.
(2) in the present invention, the height of right angle outer conical surface speculum is greater than the height of right angle round platform medial surface speculum, utilize the retrodirective reflection characteristic, can eliminate the influence of the gain uneven distribution in the pulse high intensity laser, to solid laser rod, the inhomogeneities of solid laser crystal lath thin slice under excitation, the gas discharge inhomogeneities, gas refracting index inhomogeneities etc. plays the optical compensation effect, has fully guaranteed the quality and the energy of solid or pulse gas-laser device output beam.
(3) the present invention is simple in structure, and processing and manufacturing is easy.
(4) anti-imbalance ability is strong, total reflective mirror or outgoing mirror allow error angle considerably beyond the employed stable cavity of existing macro-energy pulse laser, unsteady cavity and plane-parallel resonator, working service is convenient and reliable.
(5) the present invention also can be used for solid or gas high power continuous wave laser.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of the present invention.
Fig. 2 is the front view of total reflective mirror among Fig. 1.
Fig. 3 is the right view of total reflective mirror among Fig. 1.
Embodiment
By Fig. 1～shown in Figure 3, high power pulsed laser maladjustment proof resonant cavity of the present invention, comprise completely reflecting mirror 1, flat output mirror 3 and laser working medium 2, completely reflecting mirror 1 is the combination of right angle outer conical surface speculum 4 and right angle round platform medial surface speculum 5, the central axes of these two speculums, the height h of right angle outer conical surface speculum 4
1Height h greater than right angle round platform medial surface speculum 5
2, its difference in height is less than or equal to 2mm greater than zero.
When this laserresonator was applied to superpower laser, completely reflecting mirror 1 and flat output mirror 3 water cooling heat dissipations generally at completely reflecting mirror 1 back side processing tank, used conventional running water cooling to get final product.Right angle outer conical surface speculum 4 and right angle round platform medial surface speculum 5 are positioned at the joint portion gap sealing at completely reflecting mirror 1 back side, to prevent generally to use bonding agent or welded seal to get final product to the inner infiltration of facetted mirrors.
The central axis of above-mentioned completely reflecting mirror 1 and flat output mirror 3 preferably overlaps with the resonant cavity optical axis.
Right angle outer conical surface speculum 4 and right angle round platform medial surface speculum 5 require to have higher surface figure accuracy, right angle precision, axiality and high reflectance.Facts have proved, heat-resisting and resisting laser damage performance with the oxygen-free copper mirror surface of diamond cutter ultra precision cutting surpasses polished surface, owing to being coated with even reflectance coating, the reflecting surface at right angle outer conical surface speculum 4 and right angle round platform medial surface speculum 5 has difficulties, the diamond lathe can directly cut into minute surface with interior male cone (strobilus masculinus), directly use, and needn't be coated with reflectance coating as reflective mirror.
Right angle outer conical surface speculum 4 can be realized removable coaxial the connection with screw thread, key, spline or bonding agent with right angle round platform medial surface speculum 5.Right angle outer conical surface speculum 4 and right angle round platform medial surface speculum 5 also available being welded to connect.
At the circular film that is all-trans of the inner surface of above-mentioned flat output mirror 3 plating, the annulus external diameter equals the diameter of outgoing mirror, and ring width is less than half of flat output mirror 3 diameters.Like this, can produce the effect of compression laser output facula radius.
The optical property of completely reflecting mirror 1 is: the incident ray of any direction is after completely reflecting mirror 1 reflection, and reflection ray is parallel with incident ray.In other words, as long as the incident ray direction is constant, no matter how completely reflecting mirror 1 rocks around the summit of right angle outer conical surface speculum 4, and the direction of reflection ray is constant all the time, is consistent with the incident ray direction.According to this character, the direction of high power pulsed laser maladjustment proof resonant cavity output light of the present invention is identical with the normal direction of flat output mirror 3, and when the summit of right angle outer conical surface speculum 4 is positioned near the optical axis, the central axis of completely reflecting mirror 1 gets final product bright dipping with optical axis is approximate when overlapping, and goes out light energy and beam quality and does not obviously descend.
Claims (6)
1. high power pulsed laser maladjustment proof resonant cavity, comprise completely reflecting mirror, flat output mirror and laser working medium, it is characterized in that: completely reflecting mirror (1) is the combination of right angle outer conical surface speculum (4) and right angle round platform medial surface speculum (5), the central axes of these two speculums, the height of right angle outer conical surface speculum (4) is greater than the height of right angle round platform medial surface speculum (5), its difference in height greater than zero less than or etc. 2mm.
2. high power pulsed laser maladjustment proof resonant cavity according to claim 1, it is characterized in that: when this laserresonator is applied to superpower laser, completely reflecting mirror (1) and flat output mirror (3) water cooling heat dissipation, right angle outer conical surface speculum (4) and right angle round platform medial surface speculum (5) are positioned at the joint portion gap sealing at completely reflecting mirror (1) back side.
3. high power pulsed laser maladjustment proof resonant cavity according to claim 1 and 2 is characterized in that: the central axis and the resonant cavity optical axis coincidence of completely reflecting mirror (1) and flat output mirror (3).
4. high power pulsed laser maladjustment proof resonant cavity according to claim 3 is characterized in that: right angle outer conical surface speculum (4) is connected with screw thread, key, spline or bonding agent with right angle round platform medial surface speculum (5).
5. high power pulsed laser maladjustment proof resonant cavity according to claim 3 is characterized in that: right angle outer conical surface speculum (4) and right angle round platform medial surface speculum (5) are with being welded to connect.
6. high power pulsed laser maladjustment proof resonant cavity according to claim 3, it is characterized in that: at the circular film that is all-trans of inner surface plating of above-mentioned flat output mirror (3), the annulus external diameter equals the diameter of outgoing mirror, and ring width is less than half of flat output mirror (3) diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101245923A CN100486063C (en) | 2006-09-22 | 2006-09-22 | High power pulsed laser maladjustment proof resonant cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101245923A CN100486063C (en) | 2006-09-22 | 2006-09-22 | High power pulsed laser maladjustment proof resonant cavity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1929217A CN1929217A (en) | 2007-03-14 |
| CN100486063C true CN100486063C (en) | 2009-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006101245923A Expired - Fee Related CN100486063C (en) | 2006-09-22 | 2006-09-22 | High power pulsed laser maladjustment proof resonant cavity |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904538B (en) * | 2012-12-26 | 2017-06-06 | 清华大学 | Laser |
| CN103904539B (en) * | 2012-12-26 | 2017-02-22 | 清华大学 | Laser device |
| CN110985256B (en) * | 2019-12-19 | 2021-05-14 | 哈尔滨工程大学 | Constant volume elastic reflector end cover and porous oil sprayer spraying test system applying same |
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Granted publication date: 20090506 Termination date: 20091022 |