CN100442133C - Laser-beam mode control device - Google Patents
Laser-beam mode control device Download PDFInfo
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- CN100442133C CN100442133C CNB200610030004XA CN200610030004A CN100442133C CN 100442133 C CN100442133 C CN 100442133C CN B200610030004X A CNB200610030004X A CN B200610030004XA CN 200610030004 A CN200610030004 A CN 200610030004A CN 100442133 C CN100442133 C CN 100442133C
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Abstract
The laser-beam-mode controller comprises: a laser, a flat lens on output beam direction of laser whose convex surface is opposite to laser output side, an antireflection film on the convex surface of lens matched with work wavelength, and a semi-permeable film on lens center, wherein the distance between the lens flat surface and laser output end is the focal length. This invention improves system stability and beam quality with simple structure.
Description
Technical field
The present invention relates to the laser beam resonant cavity, particularly a kind of laser-beam mode control device.
Background technology
Along with of the raising of fields such as present industry, military affairs, communication to the laser beam requirement, the beam quality that also will guarantee when promptly requiring laser beam power to increase.When but the power of laser instrument improved usually, the pattern of output beam increased, and beam quality descends.The pattern control technology of utilizing laser beam is the effective way that solves these high requests, and especially exocoel pattern control technology can obtain high-quality output.In the prior art, usually adopt the technology of combination of elements such as a plurality of laser instrument coherent beam combinations or employing exocoel and grating, wave filter to reach the purpose that improves beam quality, more relatively being difficult to of used optical element realizes, the position of importing many laser beam also there is strict demand, referring to technology [Opt.Lett. formerly, 2005, Vol.30 (12), 1485-1487; Opt.Lett., 1993, Vol.18 (18), 1520-1522], more than the coupling that the output laser of fiber array can be concerned with of the method for two kinds of exocoels improve output beam quality, but used optical element is many, the operation of multichannel light beam, it is very high that light path is regulated requirement, distance between each optical element and the distance between the input beam also need strict control, and the stability of total system is not high yet, implement difficulty, repeatedly pass through the surface of each element when coming and going in resonator cavity owing to light beam in addition, optical energy loss is bigger.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned technology formerly, a kind of laser-beam mode control device is provided,, improve system stability and beam quality with simplified structure; Overcome the restriction of the element that uses wave filter and grating, carry out coherent combination without the multichannel light beam.
Technical solution of the present invention is as follows:
A kind of laser-beam mode control device, comprise laser instrument, it is characterized in that putting a plano-convex lens with optical axis ground in the output beam direction of described laser instrument, the convex surface of this plano-convex lens is relative with the output end face of described laser instrument, distance between the plane of this plano-convex lens and the output end face of described laser instrument equals the focal length of described plano-convex lens, the convex surface plating of described plano-convex lens is to the anti-reflection film of operation wavelength coupling, and plating has the semi-permeable diaphragm of certain reflectivity in the disc of the planar central place certain radius of this plano-convex lens to the laser work wavelength.
Described semi-permeable diaphragm is 20%～90% to the reflectivity of operation wavelength.Assurance has only the laser beam of low step mode to vibrate in Compound Cavity to obtain high-quality laser beam output
The area of the planar central of described plano-convex lens plating semi-permeable diaphragm directly projects facula area on the described plano-convex lens less than the laser beam by described laser instrument output.
The laser beam of described laser instrument output projects on the described plano-convex lens, because the effect of semi-permeable diaphragm, have only near the laser of the low step mode of close optical axis center to obtain reflecting to form feedback, in laser cavity and coupler, also just have only the laser of low step mode to form the last output of vibration.This system controls the pattern of light beam, and the quality of output beam is improved.
The present invention has compared a lot of significantly advantages with technology formerly, the single beam operation is simple in structure, light path is uncomplicated, be convenient to regulate, do not need formerly a plurality of optical elements in the technology, also not needing has strict requirement to relative position between the multi-laser beam and arrangement mode.The present invention is applicable to multiple laser instrument, comprises solid state laser, gas laser and fiber laser or the like.
The present invention is further illustrated below in conjunction with accompanying drawing and embodiment.
Description of drawings
Fig. 1 is a laser-beam mode control device structural representation of the present invention.
Embodiment
See also Fig. 1 earlier, Fig. 1 is the structural representation of laser-beam mode control device of the present invention.As seen from the figure, laser-beam mode control device of the present invention is made up of laser instrument 1 and plano-convex lens 2, and this plano-convex lens 2 and the coaxial placement of laser instrument 1 output beam is characterized in that described plano-convex lens 2 equates with the focal length of plano-convex lens 2 with the distance of laser instrument 1; The convex surface of described plano-convex lens 2 is coated with the anti-reflection film 22 that is complementary with operation wavelength, plate the semi-permeable diaphragm 21 that has with the certain reflectivity of operation wavelength in the little disc of the certain radius of the center on plano-convex lens 2 planes, the reflectivity of 21 pairs of operation wavelengths of semi-permeable diaphragm can be between 20%-90%, the area of the little disc of the certain radius of center plating semi-permeable diaphragm 21 must directly be exported the facula area that projects on the plano-convex lens 2 less than laser beam, like this, this semi-permeable diaphragm 21 constitutes a coupler with the output end face of laser instrument 1.The principle of work of this device is, the output beam 3 of laser instrument 1 projects on the plano-convex lens 2 collimated, then because the reflex of semi-permeable diaphragm 21, make the low step mode 4 of close optical axis center obtain reflection, form feedback and enter once more in the laser instrument 1, and do not feed back from optical axis higher order mode far away.In laser instrument 1 and coupler, have only low step mode to form vibration, finally obtain 5 outputs of high-quality laser beam.
Be two specific embodiments below:
Embodiment 1:
Nd:YVO to a diode pumping source
4The control of solid state laser implementation pattern, used pumping source is the diode array laser instrument of 810nm, Nd:YVO
4The long 1mm of crystal, Nd:YVO
4The high saturating Double-color film of one end of crystal plating 1064nm high-reflecting film and 810nm is as the input end of laser instrument 1 pump light, and the other end plates the output terminal of 1064nm wavelength laser semi-permeable diaphragm 21 as laser instrument, and reflectivity is 15%.The diameter of our used plano-convex lens 2 is 30mm, and focal length 150mm, the anti-reflection film of convex surface plating 1064nm, plano-convex lens planar central place radius are that the roundlet face plating of 0.5mm is 80% semi-permeable diaphragm 21 to the 1064nm reflectivity.Assurance has only the laser beam 4 of low step mode to vibrate in Compound Cavity to obtain high-quality laser output 5.The area of the little disc of the certain radius of described center plating semi-permeable diaphragm 21 must project facula area on the plano-convex lens 2 less than laser instrument 1 direct outgoing laser beam 3.With the plane separation laser output 150mm place of this plano-convex lens 2 and with the coaxial setting of output beam.System finally exports the light beam of the nearly diffraction limit of 1064nm, the quality factor M of light beam
2Equal 1.03, we have measured the quality factor M of the Laser Output Beam when not adopting plano-convex lens to carry out pattern control simultaneously
2=1.5, prove that thus adopting special plano-convex lens to carry out pattern control is that effectively beam quality is improved.
Embodiment 2:
To fiber laser 1 an implementation pattern control, used pump light source is that wavelength is the diode array laser instrument of 975nm, used optical fiber is that inner cladding is a D shape, the inner cladding major and minor axis is of a size of 450 μ m/400 μ m, inner cladding numerical aperture NA=0.37, mix Yb core diameter 30 μ m, fibre core numerical aperture NA=0.16, fiber lengths 18.2m.One end of optical fiber is placed the pump light input end of a double color plate as laser instrument, and thoroughly simultaneously to the high reflection of 1080nm, the other end of optical fiber polishes has 4% the Fresnel reflection rate output terminal as laser instrument to this double color plate to the 975nm height.The diameter of the plano-convex lens 2 that we adopt is 30mm, and focal length is 30mm, the anti-reflection film of convex surface plating 1080nm, and it is 0.5mm that radius is plated at the planar central place respectively, the reflectivity to 1080nm of 1mm and 1.5mm is 80% semi-permeable diaphragm.Principle of work is identical with example 1, when we adopt the semi-permeable diaphragm of place, plano-convex lens plane plating radius 0.5mm, and system's output beam quality factor M
2=1.3, beam quality factor is respectively M when being 1mm and 1.5mm corresponding to the semi-permeable diaphragm radius
2=1.7 and M
2=2.1.But do not adopt special plano-convex lens to carry out pattern control, fiber laser output beam quality factor M
2=2.7, this shows that system's output beam quality improves gradually along with the reducing of semi-permeable diaphragm area, reach the purpose of pattern control.If the selection suitable parameters, it is possible fully obtaining single mode output.
Show that by above experiment the present invention not only improves system stability and beam quality, and simple in structure, easily adjust, overcome the difficult disadvantage of adjusting of prior art complex structure.
Claims (2)
1, a kind of laser-beam mode control device, it comprises laser instrument (1), it is characterized in that putting a plano-convex lens (2) with optical axis ground in the output beam direction of described laser instrument (1), the convex surface of this plano-convex lens (2) is relative with the output end face of described laser instrument, distance between the output end face of plane of this plano-convex lens (2) and described laser instrument (1) equals the focal length of described plano-convex lens (2), the convex surface plating of described plano-convex lens (2) is to the anti-reflection film (22) of operation wavelength coupling, plating has the semi-permeable diaphragm (21) of certain reflectivity to the laser work wavelength in the disc of the planar central place certain radius of this plano-convex lens (2), and the area of the planar central plating semi-permeable diaphragm (21) of described plano-convex lens (2) directly projects facula area on the described plano-convex lens (2) less than the laser beam by described laser instrument (1) output.
2, laser-beam mode control device according to claim 1 is characterized in that described semi-permeable diaphragm (21) is 20%～90% to the reflectivity of operation wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610030004XA CN100442133C (en) | 2006-08-11 | 2006-08-11 | Laser-beam mode control device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610030004XA CN100442133C (en) | 2006-08-11 | 2006-08-11 | Laser-beam mode control device |
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| CN1908796A CN1908796A (en) | 2007-02-07 |
| CN100442133C true CN100442133C (en) | 2008-12-10 |
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| CNB200610030004XA Expired - Fee Related CN100442133C (en) | 2006-08-11 | 2006-08-11 | Laser-beam mode control device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87214068U (en) * | 1987-10-10 | 1988-09-07 | 清华大学 | Miniature internal chamber raman frequency-shift laser |
| CN1209668A (en) * | 1997-08-22 | 1999-03-03 | 杭州大学 | Laser reflector having mutational reflectivity |
| CN1560966A (en) * | 2004-02-23 | 2005-01-05 | 中国科学院上海光学精密机械研究所 | Large core diameter fibre-optical laser |
| CN2932768Y (en) * | 2006-08-11 | 2007-08-08 | 中国科学院上海光学精密机械研究所 | Laser beam mode control device |
-
2006
- 2006-08-11 CN CNB200610030004XA patent/CN100442133C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87214068U (en) * | 1987-10-10 | 1988-09-07 | 清华大学 | Miniature internal chamber raman frequency-shift laser |
| CN1209668A (en) * | 1997-08-22 | 1999-03-03 | 杭州大学 | Laser reflector having mutational reflectivity |
| CN1560966A (en) * | 2004-02-23 | 2005-01-05 | 中国科学院上海光学精密机械研究所 | Large core diameter fibre-optical laser |
| CN2932768Y (en) * | 2006-08-11 | 2007-08-08 | 中国科学院上海光学精密机械研究所 | Laser beam mode control device |
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| CN1908796A (en) | 2007-02-07 |
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Granted publication date: 20081210 Termination date: 20110811 |