CN201975679U - Spatial folding laser resonator with insensitive polarization - Google Patents
Spatial folding laser resonator with insensitive polarization Download PDFInfo
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- CN201975679U CN201975679U CN201120074952XU CN201120074952U CN201975679U CN 201975679 U CN201975679 U CN 201975679U CN 201120074952X U CN201120074952X U CN 201120074952XU CN 201120074952 U CN201120074952 U CN 201120074952U CN 201975679 U CN201975679 U CN 201975679U
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Abstract
The utility model discloses a spatial folding laser resonator with insensitive polarization, which comprises a totally reflecting mirror, 4*N turning mirrors, an output mirror and laser working media, wherein the totally reflecting mirror and the output mirror are vertical to an optical axis, and the centers of the totally reflecting mirror and the output mirror are on the optical axis; the 4*N turning mirrors are flat high-reflecting mirrors, and the centers of the turning mirrors are arranged on the optical axis; normal lines of the 2*N turning mirrors are parallel to a meridian plane, an included angle between the normal lines of each two adjacent turning mirrors is 90 degrees, normal lines of the rest 2*N turning mirrors are parallel to a sagittal plane, an included angle between the normal lines of each two adjacent turning mirrors is also 90 degrees, and included angles between the normal lines of the 4*N turning mirrors and the optical axis are respectively 45 degrees; and the laser working media are arranged on folding arms vertical to the totally reflecting mirror. According to the laser resonator, the phenomenon of polarization selection of the turning mirrors in the same plane is avoided. The polarization of outputted laser is decided by the polarization selectivity characteristic of the totally reflecting mirror, the output power is high, the beam quality is good, and the laser resonator can be applied to middle or high power gas or solid lasers.
Description
Technical field
The utility model belongs to laser device field, relates to laserresonator, particularly the folding laserresonator in a kind of space of polarization insensitive.
Background technology
In the laser commercial Application, as fields such as laser welding, laser cutting.The polarization characteristic of laser is used these all very big influence.In laser cutting, adopt linearly polarized light not high as the cut quality that the cutting light beam obtains, uniformity is very poor.And the cut quality that adopts circularly polarized light and random polarization to obtain is better than linearly polarized light.
General industrial adopts refrative cavity in the same plane with superpower laser, output all be linearly polarized light.Using needs to adopt the phase delay mirror with quarter-wave phase delay that linearly polarized light is converted into circularly polarized light as last.This method need add phase delay element, has increased the complexity of system of processing light path, and laser power is had certain loss, and cost improves, and assembling is complicated.
And general straight cavity laser is not when adopting polarization to select element in the chamber, output be random polarization laser.But this class laser chamber is long limited, so also limited output power of laser.Although so the straight cavity laser of this class to the polarization non-selectivity, can not output high-power laser, be difficult in industrial processes, use.
Summary of the invention
The utility model has proposed a kind of folding laserresonator in space of polarization insensitive at the deficiency of above-mentioned technology, and the utility model can be eliminated the influence of resonant cavity refrative mirror to vibration light beam polarization state in the chamber, and can realize the output of high power laser light.
The space of a kind of polarization insensitive that the utility model provides folds laserresonator, it is characterized in that: it comprises total reflective mirror, a 4*N turning mirror, outgoing mirror and laser working medium, N=1,2 or 3;
Total reflective mirror and outgoing mirror are perpendicular to optical axis, and the center all is positioned on the optical axis; 4*N turning mirror is the plane high reflection mirror.4*N turning mirror on the light path between total reflective mirror and outgoing mirror, and the center of each turning mirror all is positioned on the optical axis of laserresonator; The normal turning mirror number parallel with meridian plane equates with the parallel turning mirror number of normal and sagittal surface, wherein, in normal 2*N the turning mirror parallel with meridian plane, angle between adjacent two turning mirror normals is 90 °, in its co-normal 2*N turning mirror parallel with sagittal surface, the angle between adjacent two turning mirror normals also is 90 °.And the normal of 4*N turning mirror and the angle of optical axis are 45 °.On the optical axis, the minute surface center of each adjacent two turning mirror overlaps, and laser working medium is positioned on all folding arms vertical with total reflective mirror.
The utlity model has following advantage: the refrative cavity structure does not influence the polarizability of light field in the chamber, and the loss of resonator is low, and gain length is big, can realize high power output, and the beam quality of laser also improves simultaneously.Wide adaptability adopts common spherical mirror or level crossing as the chamber mirror, can obtain the laser of high power random polarization.And adopt have different polarization optionally the chamber mirror can obtain all kinds of light beams such as linearly polarized light, radial polarisation light, hoop polarised light.Simple in structure, Installation and Debugging convenience can satisfy the requirement of middle and high power laser output.
Description of drawings
Fig. 1 is the utility model embodiment 1 space three fold resonator structural representations;
Fig. 2 is the utility model embodiment 2 spaces five fold resonator structural representations;
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 1, the structure of a kind of embodiment 1 of the present utility model specifically comprises total reflective mirror 1, a 4*N turning mirror (N=1 in this example) 2,3,4,5, outgoing mirror 6 and laser working medium 7.
Total reflective mirror 1 is a speculum with high reflectance, simultaneously is positioned at meridian plane with the vertical plane of completely reflecting mirror and first, second turning mirror 2,3, and is positioned at sagittal surface with the 3rd, the 4th turning mirror 4,5 with the vertical plane of outgoing mirror 6 simultaneously.Outgoing mirror is the speculum of a partial reflectance.Folding arm is meant in the folding laserresonator, on the optical axis, and the space between adjacent two mirror bodies.Laser working medium can be a gas, solid or liquid, and it is positioned on all folding arms vertical with total reflective mirror.
Turning mirror 2,3, on 4,5 the optical axis that is centered close to laserresonator, turning mirror 2,3,4,5 the normal and the angle of optical axis are 45 °.Angle between the normal of first, second turning mirror 2,3 is 90 °, and the angle between the normal of the 3rd, the 4th turning mirror 4,5 also is 90 °.Each adjacent two minute surface center overlaps on the optical axis.
The light that is parallel to optical axis incident will be parallel to the optical axis reflection through behind first, second turning mirror 2,3.After light beam reflected through first, second turning mirror 2,3, the intensity of polarized component will be than polarized component intensity height on the meridian direction on the sagitta of arc direction.The light that is parallel to optical axis incident will be parallel to the optical axis reflection through behind the turning mirror 4,5.After light beam reflects through turning mirror 4,5, the intensity of polarized component will be lower than the intensity of polarized component on the meridian direction on the sagitta of arc direction.After light beam reflected through turning mirror 2,3,4,5, the intensity of the polarized component on all directions was identical.So just eliminated the depolarization influence of turning mirror in the same plane to the chamber inner light beam.Meanwhile also increased the length of resonant cavity, helped improving laser beam quality and strengthen laser power.
As shown in Figure 2, example 2 is space five fold resonator structures.Specifically comprise total reflective mirror 1, a 4*N turning mirror (N=2 in this example) 2,3,4,5,8,9,10,11, outgoing mirror 6 and laser working medium 7.
Turning mirror 2,3,8,9 normal all is parallel to meridian plane, turning mirror 2,3,8,9 the normal and the angle of optical axis are 45 °, and the angle between angle between turning mirror 2,3 normals and turning mirror 8,9 normals is 90 °.After the light that is parallel to optical axis incident passes through turning mirror 2,3 or turning mirror 8,9 respectively, will be parallel to the optical axis reflection.After light beam reflected through turning mirror 2,3,8,9, the intensity of polarization light on the sagitta of arc direction will be than the intensity height of polarized component on the meridian direction.Turning mirror 4,5,10,11 normal all is parallel to sagittal surface, turning mirror 4,5,10,11 the normal and the angle of optical axis are 45 °, and the angle between turning mirror 8,9 normals is 90 ° with angle between turning mirror 10,11 normals.After the light that is parallel to optical axis incident passes through turning mirror 4,5 or turning mirror 10,11 respectively, will be parallel to optical axis and be reflected.Light beam will be lower than the intensity of polarized component on the meridian direction through the intensity of polarized component on turning mirror 4,5,10, the 11 reflection back sagitta of arc directions.After light beam reflected through turning mirror 2,3,4,5,8,9,10,11, the intensity of polarized component was identical on all directions.Equally not only eliminated the depolarization influence of turning mirror in the same plane, and increased the length of resonant cavity, helped improving the power and the beam quality of output laser the chamber inner light beam.
The utility model not only is confined to above-mentioned embodiment; persons skilled in the art are according to the disclosed content of the utility model; can adopt other multiple embodiment to implement the utility model; therefore; every employing project organization of the present utility model and thinking; do some simple designs that change or change, all fall into the scope of the utility model protection.
Claims (3)
1. the space of a polarization insensitive folds laserresonator, and it is characterized in that: it comprises total reflective mirror, a 4*N turning mirror, outgoing mirror and laser working medium, N=1,2 or 3;
Total reflective mirror and outgoing mirror are perpendicular to optical axis, and the center all is positioned on the optical axis; 4*N turning mirror is the plane high reflection mirror, 4*N turning mirror on the light path between total reflective mirror and outgoing mirror, and the center of each turning mirror all is positioned on the optical axis of laserresonator; The normal turning mirror number parallel with meridian plane equates with the parallel turning mirror number of normal and sagittal surface, wherein, the normal of 2*N turning mirror is parallel with meridian plane, and the angle between adjacent two turning mirror normals is 90 °, the normal of all the other 2*N turning mirror is parallel with sagittal surface, angle also is 90 ° between adjacent two turning mirror normals, and the normal of 4*N turning mirror and the angle of optical axis are 45 °, on the optical axis, the minute surface center of each adjacent two turning mirror overlaps, and laser working medium is positioned on all folding arms vertical with total reflective mirror.
2. the space of polarization insensitive according to claim 1 folds laserresonator, and it is characterized in that: completely reflecting mirror is polarizer, level crossing, concave mirror or other double-curved surface mirror of high reflectance.
3. the space of polarization insensitive according to claim 2 folds laserresonator, and it is characterized in that: the polarizer of high reflectance is the high reflection mirror face of common no polarization selectivity, perhaps has the high reflection mirror of polarization selectivity film, perhaps grating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120074952XU CN201975679U (en) | 2011-03-21 | 2011-03-21 | Spatial folding laser resonator with insensitive polarization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120074952XU CN201975679U (en) | 2011-03-21 | 2011-03-21 | Spatial folding laser resonator with insensitive polarization |
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| Publication Number | Publication Date |
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| CN201975679U true CN201975679U (en) | 2011-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201120074952XU Expired - Lifetime CN201975679U (en) | 2011-03-21 | 2011-03-21 | Spatial folding laser resonator with insensitive polarization |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102157890A (en) * | 2011-03-21 | 2011-08-17 | 华中科技大学 | Polarization-insensitive space folding laser resonator |
| CN106735924A (en) * | 2017-03-17 | 2017-05-31 | 天津欧泰激光科技有限公司 | A kind of ultrafast marking machine based on ultrafast optical fiber laser |
-
2011
- 2011-03-21 CN CN201120074952XU patent/CN201975679U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102157890A (en) * | 2011-03-21 | 2011-08-17 | 华中科技大学 | Polarization-insensitive space folding laser resonator |
| CN102157890B (en) * | 2011-03-21 | 2012-07-25 | 华中科技大学 | Polarization-insensitive space folding laser resonator |
| CN106735924A (en) * | 2017-03-17 | 2017-05-31 | 天津欧泰激光科技有限公司 | A kind of ultrafast marking machine based on ultrafast optical fiber laser |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110914 Effective date of abandoning: 20130227 |
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| RGAV | Abandon patent right to avoid regrant |