CN102255225B - Independent chirp parameter regulating system for realizing two-tone laser field - Google Patents
Independent chirp parameter regulating system for realizing two-tone laser field Download PDFInfo
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Abstract
The invention relates to an independent chirp parameter regulating system for realizing a two-tone laser field. A beam splitting piece which is inserted into an entrance of a pulse compressor of a femtosecond pulse laser divides the light from the femtosecond pulse laser through the regenerative amplifier to realize the energy amplification into two beams of light; the first beam of light enters into one pulse compressor and a hollow optical chirp system, and the other beam of light passes through a plane mirror B and enters into the other pulse compressor and the other hollow optical chirp system; the two beams of light are synthetized into one beam of light after passing through a reflector delayed time system and a frequency doubling crystal; and the synthesized beam of light passes through a reversible plane mirror and then is connected with a higher-order harmonic generating and detecting device and a spectrum phase interferometry instrument respectively so as to form the independent chirp parameter regulating system for realizing the two-tone laser field. The independent chirp parameter regulating system can carry out independent pulse compression on light with amplified energy in a femtosecond amplifier so as to acquire two beams of laser light sources capable of independently regulating the chirps; and the independent chirp parameter regulating system is simple in structure and easy to operate.
Description
Technical field
The present invention relates to a kind of parameter independent regulation system that warbles that realizes the two-color laser field.Can be used for two-color laser field or cycle magnitude two-color laser field, realize warble the separately independent regulation of parameter of two-beam source.
Background technology
Existing two-color laser field system all is after the pulse shortener of femtosecond laser amplifier, and light source is divided into two bundles, closes bundle with another bundle again after frequency multiplication is a branch of, makes up double-colored.Because two-beam overlaps on these parameters in intensity, wavelength, polarization, time-delay can separate regulation, therefore, produces in the process of the accurate spectrum of ultraviolet in high order harmonic component, the double-colored field method of this kind is widely used.Yet what this kind method was used is the light source of same pulse shortener output, and the chirp value that light comprised is identical, in case the regulating impulse compressor reducer, the content of warbling of the two-beam that the back separates all can change.Therefore, in the double-colored field that has constructed double-colored field or cycle magnitude now, the parameter of warbling can not independent regulation.But produce in the process of the accurate spectrum of ultraviolet in the high order harmonic component method; But the content of warbling of light source is a very important parameter, directly the time domain width of gained chirped pulse after the spectrum form of the accurate spectrum of the final ultraviolet that obtains of influence and the Fourier transform.Therefore, a kind of parameter of warbling of our needs can be by the two-color laser field system of accurate and independent tuning.
Summary of the invention
The invention discloses a kind of parameter independent regulation system that warbles that realizes the two-color laser field, purpose is to overcome prior art can not when using the two-color laser field to produce ultraviolet spectra, realize the warble shortcoming of parameter independent regulation of two-beam source.The source of the present invention from warbling and regulating---before the pulse shortener; Be about to light source separately; Separately through closing bundle again after pulse shortener and the subsequent adjustment; Not only can keep the multi-parameter adjusting function of original two-color laser field, and can effectively realize the warble independent regulation of parameter of double-colored light source, for the multidimensional regulation and control of the accurate spectrum of later stage ultraviolet and the single chirped pulse that obtains transform limit lay the foundation ultraviolet spectra.
A kind of parameter independent regulation system that warbles that realizes the two-color laser field; A beam splitting chip is inserted in pulse shortener porch at femto-second laser; With realizing that through the regenerative amplification chamber light after energy amplifies is divided into two bundles in the femto-second laser; Wherein the first bundle light gets into a cover pulse shortener, hollow optical fiber chirped system; Another beam optical path gets into another set of pulse shortener, hollow optical fiber chirped system behind plane mirror B, pass through speculum delayed time system, frequency-doubling crystal then after, two-beam through one close the bundle sheet be combined into a branch of light; Behind turnover plane mirror; Be connected with sniffer, spectrum position interference measuring instrument with the high order harmonic component generation respectively, constitute the parameter independent regulation system that warbles of two-color laser field, the independent regulation that two-beam can be realized warbling on light path separately, intensity, wavelength, polarization, time-delay overlap these parameters.
Realize the light after energy amplifies through the regenerative amplification chamber in the femto-second laser, in pulse shortener, carry out the compression of pulse duration.Pulse shortener is made up of grating, corner cube mirror delayed time system and a plane mirror A.Incident light by the grating dispersion broadening after; Be divided into the different light of a lot of wavelength; The light of these different wave lengths is through after being fixed on the prism square and plane mirror on the delayed time system, and the light path of being walked when getting back to grating is different, and this system promptly changes the distance between prism square and grating through regulating delayed time system; Just can adjust the optical path difference between the different wave length, thereby realize the adjustment of the pulse duration of final output light source.For attainable narrow pulse width, be called zero state of warbling this moment, and pulse duration is referred to as the state of warbling greater than the state of narrow pulse width, the pulse width information that is comprised in the corresponding pulse is called chirp value.Like this, we are in actual mechanical process, as long as the distance between appropriately change prism square and grating just can realize the adjusting of the parameter of warbling of output light source.
Hollow optical fiber chirped system is comparatively ripe at present, as to be used to compress femtosecond light source pulse width device, the narrowest femtosecond pulse that obtains the cycle magnitude.This system mainly is made up of chirped mirror hollow optical fiber system and several.Be filled with inert gas in the hollow optical fiber, femtosecond laser in optical fiber with the effect of inert gas generation strong nonlinearity, spectrum is by broadening, through chirped mirror it carried out the pulsewidth compression again.This system can be according to actual needs, the last pulse duration that obtains of adjustment.Our the two-color laser field regulating system of warbling all is suitable for for the light source of various pulse durations.And the pulse duration of light is narrow more, and it is obvious more to the influence of the accurate spectrum of ultraviolet to regulate its content of warbling.
Closing the bundle sheet is the conllinear propagation that is used for realizing the double-colored light source of two bundles, and this light combination mirror sheet can be selected the anti-reflection film and the reflectance coating of corresponding its optical source wavelength according to actual conditions, thereby realizes the lowest loss of two-beam source energy.In addition, for the special circumstances that cycle magnitude femtosecond light source closes bundle, we can not ignore the influence of this eyeglass to two-beam source pulse duration.At this moment, we also can utilize the regulating system of independently warbling, and to the two-beam source precompensation of warbling, like this, both can not influence the energy of whole system respectively, can guarantee the pulse duration of every light source beam again.
Advantage of the present invention and good effect:
1. used two pulse shorteners, the light after energy in the femtosecond amplifier is amplified carries out independent pulse compression, thereby but two of the independent regulation that can obtain to warble is restrainted LASER Light Sources;
2. the present invention is simple in structure, easy to operate, and the result who regulates is stable.In actual mechanical process, need only the distance between appropriately change prism square and grating, just can realize the independent regulation of the parameter of warbling of output light source.Neither influence the adjusting of warbling of another beam optical path, also can guarantee the accurate pulse duration of every light source beam according to follow-up actual light path (the for example acquisition of cycle magnitude light source, the introducing of polarizer) appropriately change chirp value;
3. this two-color laser field regulating system of warbling all is suitable for for the light source of various pulse durations; Pulse duration not needing last output is narrower than under the pulse duration situation of laser itself; Can omit hollow optical fiber chirped system, make that system is more succinct, it is tuning to be prone to;
4. when being applied to this method in the process that high order harmonic component produces, except can realizing effective generation of the accurate spectrum of ultraviolet, can also be to the accurate spectrum of the ultraviolet that generates warble the accurate of content, spectrum form and control in real time.
Description of drawings
Fig. 1 realizes the parameter independent regulation system configuration sketch map of warbling of two-color laser field for the embodiment of the invention 1.
1. realize the light pulse after energy amplifies, 2. plane mirror A, 3. grating, 4. corner cube mirror delayed time system through the regenerative amplification chamber in the femto-second laser; 5. pulse shortener, 6. plane mirror B, 7. transmissibility of adjustable attenuation piece, 8. hollow optical fiber chirped system; 9. high order harmonic component produces and sniffer, 10. beam splitting chip, 11. polarizers, 12. speculum delayed time systems; 13. frequency-doubling crystal, 14. close the bundle sheet, 15. turnover plane mirrors, 16. spectrum position interference measuring instruments.
Embodiment
Describe the present invention below in conjunction with accompanying drawing and embodiment.
A kind of parameter independent regulation system that warbles that realizes the two-color laser field; Structure is as shown in Figure 1; A beam splitting chip 10 is inserted in porch at the pulse shortener 5 of femto-second laser; With realizing that through the regenerative amplification chamber light after energy amplifies is divided into two bundles in the femto-second laser, wherein the first bundle light directly gets into one and overlaps pulse shortener 5, hollow optical fiber chirped system 8, the another set of pulse shortener of entering 5, hollow optical fiber chirped system 8 behind another Shu Guangjing plane mirror B; After passing through speculum delayed time system 12, frequency-doubling crystal 13 then; Two-beam closes bundle sheet 14 through one and is combined into a branch of light, behind turnover plane mirror 15, is connected with sniffer 9, spectrum position interference measuring instrument 16 light paths with the high order harmonic component generation respectively; Constitute the parameter independent regulation system that warbles of two-color laser field, the independent regulation that two-beam can be realized warbling, intensity, wavelength, polarization, time-delay overlap these parameters on light path separately.
Following examples: laser output center wavelength of light is 800nm; Pulse duration is 40fs; The frequency doubled light that obtains the 800nm light source with BBO frequency-doubling crystal 13 is an example; The parameter independent regulation process of warbling of concrete realization two-color laser field is following: by realizing the light pulse 1 after energy amplifies through the regenerative amplification chamber in the femto-second laser, get into pulse shortener 5, realize the adjusting of its pulse chirp amount through the relative distance between adjusting grating 3 and the corner cube mirror delayed time system 4.After this adjustable laser pulse of warbling is regulated its intensity through transmissibility of adjustable attenuation piece 7, converge in the hollow optical fiber chirped system 8, can obtain the tunable femtosecond laser of warbling (the pulsewidth scope: 40～4fs) of pulsewidth.At this moment, 1: but 1 beam splitting chip 10 and the femtosecond laser of warbling that closes another identical independent tuning in road of bundle sheet 14 places parallel connection.In this road, also add a transmissibility of adjustable attenuation piece 7, made things convenient for the continuous adjusting of laser intensity; Increased the light source that a BBO frequency-doubling crystal 13 is used to obtain 400nm, its polarization state changes through polarizer 11.Polarizer 11 is placed on before the hollow optical fiber chirped system 8, can avoids under the situation of cycle magnitude light source the loss of 11 pairs of cycles of polarizer magnitude energy of light source.Close bundle sheet 14 and close the two-color laser field that the Shu Chengwei conllinear is propagated with 800 with the light source of 400nm, both adjust through speculum delayed time system 12 in coincidence in time.This light source that closes behind the bundle gets into the generation and the sniffer 9 of high order harmonic component, realizes the effective generation and the multidimensional regulation and control of the accurate spectrum of ultraviolet, and the parameter of regulation and control comprises: this two-beam of 800nm and 400nm intensity, pulsewidth, chirp value and relative polarization separately.In addition, the information of warbling that the two-color laser place that this conllinear is propagated comprises can reflex in the spectrum position interference measuring instrument 16 through turnover plane mirror 15 and go, and constantly measures and confirms.
Claims (1)
1. parameter independent regulation system that warbles that realizes the two-color laser field; It is characterized in that: a beam splitting chip is inserted in the pulse shortener porch at femto-second laser; With realizing that through the regenerative amplification chamber light after energy amplifies is divided into two bundles in the femto-second laser; Wherein the first bundle light gets into a cover pulse shortener, hollow optical fiber chirped system, gets into another set of pulse shortener, hollow optical fiber chirped system behind another Shu Guangjing plane mirror B, passes through speculum delayed time system, frequency-doubling crystal again; Two-beam closes the bundle sheet through one and is combined into a branch of light; Behind turnover plane mirror, be connected with sniffer, spectrum position interference measuring instrument with the high order harmonic component generation respectively, constitute the parameter independent regulation system that warbles of two-color laser field.
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| CN102494767B (en) * | 2011-12-13 | 2013-10-02 | 上海理工大学 | Device for generating orthogonal polarized double-color laser field |
| CN103560388B (en) * | 2013-11-05 | 2016-07-20 | 温州大学 | A kind of apparatus and method producing higher hamonic wave super continuous spectrums |
| CN109546522A (en) * | 2018-11-29 | 2019-03-29 | 广东工业大学 | A kind of high repetition frequency extreme ultraviolet pulse generating device |
| CN109510054B (en) * | 2018-12-27 | 2020-05-05 | 中国科学技术大学 | Method for generating multi-frequency ultrashort laser pulse train |
| CN111555101A (en) * | 2020-05-20 | 2020-08-18 | 中国科学技术大学 | Device for generating laser pulse train with adjustable frequency chirp |
| CN113644528A (en) * | 2021-07-20 | 2021-11-12 | 中国科学院上海光学精密机械研究所 | Multi-path beam splitting device and method for high-peak-power femtosecond laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2419710Y (en) * | 2000-03-30 | 2001-02-14 | 中国科学院上海光学精密机械研究所 | Femto second and tera watt level multi-pulse laser generator |
| CN1870359A (en) * | 2006-04-12 | 2006-11-29 | 中国科学院上海光学精密机械研究所 | Laser pulse stretching and compression device |
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| US6765201B2 (en) * | 2000-02-09 | 2004-07-20 | Hitachi, Ltd. | Ultraviolet laser-generating device and defect inspection apparatus and method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2419710Y (en) * | 2000-03-30 | 2001-02-14 | 中国科学院上海光学精密机械研究所 | Femto second and tera watt level multi-pulse laser generator |
| CN1870359A (en) * | 2006-04-12 | 2006-11-29 | 中国科学院上海光学精密机械研究所 | Laser pulse stretching and compression device |
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Application publication date: 20111123 Assignee: JIANGSU TUOLING PHOTOELECTRIC SCIENCE & TECHNOLOGY CO., LTD. Assignor: University of Shanghai for Science and Technology Contract record no.: 2015310000056 Denomination of invention: Independent chirp parameter regulating system for realizing two-tone laser field Granted publication date: 20120822 License type: Exclusive License Record date: 20150415 |
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