CN1091316C - Dual-wavelength femtosecond laser directional ferrule - Google Patents
Dual-wavelength femtosecond laser directional ferrule Download PDFInfo
- Publication number
- CN1091316C CN1091316C CN 97108659 CN97108659A CN1091316C CN 1091316 C CN1091316 C CN 1091316C CN 97108659 CN97108659 CN 97108659 CN 97108659 A CN97108659 A CN 97108659A CN 1091316 C CN1091316 C CN 1091316C
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- laser
- dura mater
- coated
- input light
- mirror
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- 239000013078 crystal Substances 0.000 claims abstract description 16
- 210000001951 dura mater Anatomy 0.000 claims description 21
- 238000002310 reflectometry Methods 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 238000001228 spectrum Methods 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 230000008676 import Effects 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 230000008878 coupling Effects 0.000 abstract description 10
- 238000010168 coupling process Methods 0.000 abstract description 10
- 238000005859 coupling reaction Methods 0.000 abstract description 10
- 230000003287 optical effect Effects 0.000 abstract description 4
- 230000009977 dual effect Effects 0.000 description 11
- 238000005086 pumping Methods 0.000 description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 230000005374 Kerr effect Effects 0.000 description 1
- WPDZRHVMWVFREI-UHFFFAOYSA-N [Sr].[Li].[Cr] Chemical compound [Sr].[Li].[Cr] WPDZRHVMWVFREI-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 239000010437 gem Substances 0.000 description 1
- 229910001751 gemstone Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000000243 photosynthetic effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
A directional core insert of dual-wavelength femtosecond laser is characterized in that a coupling lens is arranged at the front outer end of a folding cavity provided with a laser crystal, input light can be focused on the laser crystal, an input light reflecting mirror is arranged at the front end of the coupling lens, the input light can be reflected to the coupling lens, and the optical devices are fixed into a whole. Therefore, the invention can be suitable for various dual-wavelength femtosecond lasers, and the comprehensive technical index of the laser can exceed the prior art.
Description
The invention belongs to the solid state laser technical field, relate to the making of the directed lock pin of dual wavelength ultrashort laser device.
At present, the development of femtosecond laser technology nearly all depends on the research to solid laser material, and makes the femto-second solid laser device replace dye laser to a great extent.Resemble and mix the titanium sapphire laser, mix chromium lithium strontium aluminium fluoride laser etc. very wide tuning range is all arranged, can both produce femto-second laser pulse.Along with science and technology development, the application of the ultrashort pulse laser of pulse sequence is restricted, even powerless in some application.As aspect the researchs such as the photosynthetic primary reaction mechanism of higher plant, many excited state spectroscopies, program control femtochemistry kinetics, selectivity biochemical reaction, all need the ultrashort laser pulse of dual wavelength or multi-wavelength, could carry out resonant excitation effectively and excite detection in order.Someone once utilized first-harmonic and frequency doubling light pulse thereof to carry out pump probe, was restricted equally.So the development of double wavelength femto-second laser more and more is subject to people's attention, begin the development work that a lot of countries have carried out this respect from the nineties.J.M，Evans?et?al，Optics?letters，Vol.18，NO.13(1993)1074；M.R.X.deBarros?et?al，SPIE?Vol.2116，(1994)37；A，leitenstorfer?et?al，Opticsletters，Vol.20，No.5(1995)916。The technical indicator of having only U.S.'s Bell Laboratory to be provided in these researchs is more complete, its dual wavelength pulsewidth 55-65fs, centre wavelength is 90nm at interval, synchronization accuracy between double-wavelength pulse is less than 20fs, power output with the pumping of 8w514nm argon laser is 240mW, and other report has only several single indexs, and the narrowest pulsewidth of Germany is between 28-64fs, synchronization accuracy is 1.7fs between double-wavelength pulse, and the tuning range of 100nm is just arranged with two groups of coupling followers.
Constituting of dual wavelength ultrashort laser device: pumping source, collector lens, resonant cavity, the front portion of resonant cavity has the refrative cavity of built-in laser crystal, middle part that the disperse compensating prism is arranged, and there are slit light hurdle and output coupling mirror in the rear portion.The set of optical component in the alleged directed lock pin of the present invention is meant from input light to this scope of refrative cavity, and these optical component fixtures are become directed lock pin in one, and constitute double wavelength femto-second laser miscellaneous part can change as required or install.
The objective of the invention is to design a kind of directed lock pin of double wavelength femto-second laser, can be used among the multiple dual wavelength ultrashort laser device, and make the comprehensive technical indexes of laser surpass prior art as the special-purpose member of laser.
As follows for realizing the technical scheme that the object of the invention adopted, the structure of designed double wavelength femto-second laser directional plug core is, be built-in with laser crystal at the refrative cavity that constitutes by two concave mirrors, in the preceding outer end of refrative cavity coupled lens is arranged, it can focus on laser crystal with input light, be provided with the input light reflection mirror at its front end, input light can be reflexed to coupled lens, and these optics fixtures are become directed lock pin in one; Wherein be coated with broadband total-reflection laser dura mater at the back side of input light reflection mirror, it is fixed than beam splitting laser dura mater that its front is coated with the broadband; Be coated with high anti-reflection laser dura mater on the two sides of coupled lens, the planar ends of concave mirror is coated with high anti-reflection laser dura mater before refrative cavity, is coated with the selective laser dura mater in concave ends; Concave surface at refrative cavity back concave surface mirror is coated with high reflector laser dura mater.Feature of the present invention is that also two concave mirrors of refrative cavity are to be made by quartz glass, and wherein the reflectivity of back concave surface mirror plated film is greater than 99.9%; The selectivity plated film of preceding concave mirror can see through input light, and transmitance is greater than 85%, and to the then total reflection of spectrum that laser crystal is excited and is then produced, reflectivity is greater than 99.9%; The transmitance of coupled lens plated film is greater than 98% in addition, and the reflectivity of input light reflection mirror reflectance coating is greater than 99%, and fixed splitting ratio than beam splitting coating is 50%.
The key of double wavelength femto-second laser is the gain competition that suitably limits between the different wave length laser beam, so just can reach the intersection locked mode, exports stable dual wavelength femto-second laser pulse.The present invention adopts fixed than beam splitting, broadband film system, adjustment polarization, realizes gain allocation; Utilize dual-beam self-locking respectively, regulate the disperse of inner chamber group velocity, obtain the synchronous transmission of dual wavelength light beam, reach the intersection locked mode, adopt the aberration compensation coupled lens, the coupling pumping effectively reduces laser threshold, remedies gain loss.So the directed lock pin of the present invention's design is not only applicable to multiple double wavelength femto-second laser, and makes the comprehensive technical indexes of laser surpass prior art.
Describe specific embodiments of the present invention and result of use in detail below in conjunction with accompanying drawing.
The optical texture schematic diagram that accompanying drawing 1 uses in a kind of double wavelength femto-second laser example for the designed directed lock pin of the present invention.1 is pumping laser among the figure, and 2 are the input light reflection mirror, and 3 is coupled lens, and 4 is concave mirror before the refrative cavity, 5 is laser crystal, and 6 is concave mirror behind the refrative cavity, and 7 is speculum, and 8 are the disperse compensating prism, 9 is speculum, and 10 are the disperse compensating prism, and 11 is slit light hurdle, and 12 is output coupling mirror.Wherein 2,3,4,5,6 constitute directed lock pin of the present invention.
Referring to accompanying drawing, the structure of the double wavelength femto-second laser directional plug core that the present invention is designed is, mix titanium sapphire 5 being built-in with laser crystal by two concave mirrors 4 and 6 refrative cavities that constitute, concave mirror 4 and 6 is made by quartz glass, radius of curvature is 100mm, wherein be coated with the high reflector laser dura mater of 740-920nm wavelength at the concave surface of concave mirror 6, reflectivity is 99.95%, be coated with the high anti-reflection laser dura mater of 450-540nm wavelength in the planar ends of concave mirror 4, concave ends at concave mirror 4 is coated with the selective laser dura mater, requirement is 99.95% to the reflectivity of 740-920nm wavelength, is 87% to the transmitance of 450-540nm wavelength; Have coupled lens 3 input light can be focused on laser crystal 5 in the preceding outer end of refrative cavity, the two sides of its lens 3 all is coated with the high anti-reflection laser dura mater of 440-560nm wavelength, and transmitance is 99%; Be provided with input light reflection mirror 2 at the front end of lens 3 and input light can be reflexed to coupled lens 3, be coated with the high backward-reflected laser dura mater of passband 450--540nm wavelength at the back side of speculum 2, reflectivity is 99.9%, be coated with the fixed than beam splitting laser dura mater of passband 450-540nm wavelength in the front of speculum 2, reflectivity is 49.9%; And these optics 2,3,4,5,6 fixtures are become directed lock pin in one.Wherein said various laser dura mater all is a prior art.
In double wavelength femto-second laser as shown in the figure, wherein pumping laser 1 adopts argon ion laser directed lock pin device of the present invention, and is coated with the high backward-reflected laser dura mater of 740-920nm wavelength at output coupling mirror 12, and reflectivity is 97%.Its operation principle is: from the full spectral line light beam of argon ion laser 1 ejaculation, being decided than beam splitting by input reflection mirror 2 is two bundles, focus on by dual wavelength refrative cavity speculum 4 by coupled lens 3, focus on and advance to mix titanium sapphire laser crystal 5, produce strong self-focusing effect, the spectrum light beam that laser crystal 5 is launched, collect and reflect in the laser cavity by speculum 4 and 6 respectively, obtain gain through repeatedly coming and going, reach intersection locked mode threshold value, penetrate two bundle sequence laser pulses through light hurdle 11 and output coupling mirror 12.Since the generation of Kerr effect, and suitably carry out inner chamber disperse compensation, and then laser enters the running of intersection locked mode, adjusts light hurdle slit and can obtain required dual wavelength femto-second laser pulse.This laser is under the argon ion laser beam pumping of all fronts of 7W, output dual wavelength pulsewidth 26-39fs, centre wavelength is 95nm at interval, adopts two groups of coupling followers that the tuning range of 140nm is arranged, the about 1fs of synchronization accuracy between double-wavelength pulse, output average pulse power is greater than 200mW.Because the present invention has gain competition between the control mode of laser, interaction between the dual wavelength crossing beam and coupling effect become more little, obtain stable output easilier, thereby make the what of beating relatively between the double-wavelength pulse sequence littler.
The use of the directed lock pin of the present invention, other selection of components of laser and place should be according to demand with cavity structure and different, can carry out spread spectrum with two prisms as disperse compensating prism 8; The size of laser crystal 5 does not influence the effect of directed lock pin, and the adjustment of each position of components of lock pin is determined with collimated light beam; Very strict to the requirement of laser cavity, titanium jewel femto-second laser that in principle can single wavelength running is all applicable, and suitably increasing and decreasing other elements needs.In order to obtain stable intersection locked mode running, it is necessary carefully regulating inner chamber disperse compensation, and makes two loop light beams come and go vibration as far as possible in same plane.The relative position of two slits on the mobile light hurdle 11 can reach the purpose of wavelength tuning.
Claims (2)
1. double wavelength femto-second laser directional plug core, employing has collector lens, two refrative cavities that concave mirror constitutes, it is built-in with laser crystal, and the coating technique of laser dura mater, it is characterized in that, in the described preceding outer end of refrative cavity that is equipped with laser crystal coupled lens is set, it can focus on laser crystal with input light, be provided with the input light reflection mirror at its front end, input light can be reflexed to coupled lens, and these optics fixtures are become directed lock pin in one; Wherein import the light reflection mirror back side and be coated with broadband total-reflection laser dura mater, it is fixed than beam splitting laser dura mater that its front is coated with the broadband; Be coated with high anti-reflection laser dura mater on the two sides of coupled lens; The planar ends of concave mirror is coated with high anti-reflection laser dura mater before the refrative cavity, and its concave ends is coated with the selective laser dura mater; The concave surface of refrative cavity back concave surface mirror is coated with high reflector laser dura mater.
2. lock pin according to claim 1, it is characterized in that, two concave mirrors of refrative cavity are made by quartz glass, thereafter the reflectivity of concave mirror plated film is greater than 99.9%, before concave mirror the selectivity plated film to the input light transmitance greater than 85%, and to laser crystal be excited the back spectrum that produces reflectivity greater than 99.9%; The transmitance of the high anti-reflection coating of coupled lens is greater than 98%; The reflectivity of input light reflection mirror reflectance coating is greater than 99%, and fixed splitting ratio than beam splitting coating is 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97108659 CN1091316C (en) | 1997-09-24 | 1997-09-24 | Dual-wavelength femtosecond laser directional ferrule |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97108659 CN1091316C (en) | 1997-09-24 | 1997-09-24 | Dual-wavelength femtosecond laser directional ferrule |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1212488A CN1212488A (en) | 1999-03-31 |
| CN1091316C true CN1091316C (en) | 2002-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97108659 Expired - Fee Related CN1091316C (en) | 1997-09-24 | 1997-09-24 | Dual-wavelength femtosecond laser directional ferrule |
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| Country | Link |
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| CN (1) | CN1091316C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1332188C (en) * | 2002-12-31 | 2007-08-15 | 中国科学院西安光学精密机械研究所 | Double independent tuning femtosecond resolution pumping-detection spectrometer core |
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1997
- 1997-09-24 CN CN 97108659 patent/CN1091316C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1212488A (en) | 1999-03-31 |
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