CN101621172A - Titanium-doped sapphire laser for generating high repetition frequency few-cycle femtosecond pulses - Google Patents
Titanium-doped sapphire laser for generating high repetition frequency few-cycle femtosecond pulses Download PDFInfo
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Abstract
The invention discloses a titanium-doped sapphire laser for generating high repetition frequency few-cycle femtosecond pulses, which comprises a focusing lens, a laser gain crystal, two plano-concave broadband chatter all-reflecting mirrors which are respectively a first plano-concave broadband chatter all-reflecting mirror and a second plano-concave broadband chatter all-reflecting mirror, two pairs of small angle broadband plane chatter all-reflecting mirrors which are respectively a first small angle broadband plane chatter all-reflecting mirror, a second small angle broadband plane chatter all-reflecting mirror, a third small angle broadband plane chatter all-reflecting mirror and a fourth small angle broadband plane chatter all-reflecting mirror, a pair of small angle wedges and a broadband low-dispersion thin-output mirror. The titanium-doped sapphire laser for generating the high repetition frequency few-cycle femtosecond pulses compensates self-phase modulating effect generated in the gain crystal by the broadband chatter reflecting mirrors with special dispersion to generate laser with few-cycle pulses. The titanium-doped sapphire laser has compact and smart structure and simple mode-locked adjustment. The high repetition frequency low-cycle pulse width feature of the laser provides a reliable light source for difference frequency optical combs.
Description
Technical field
The present invention relates to a kind of lasing device, be specifically related to a kind of titanium-doped sapphire laser that produces high repetition frequency few-cycle femtosecond pulses.
Background technology
In laser technology research, ultra-short pulse laser discloses the dynamic (dynamical) unique property of material transient state as the human time period sign that can control and in microcosmos, it is one of the most popular laser research contents always, its application study is penetrated into the forefront problem of subjects such as physics, chemistry, biology, communication, and and then caused many new subjects, as the formation and development of subjects such as high field physics, femtochemistry, the big Capacity Optical communication of ultrahigh speed.Adopt ti sapphire laser oscillator (document 1, D.E.Spence, P.N.Kean, the W.Sibbert of KLM (Kerr LensModelocking) technology; Opt Lett.Vol.
1642 (1991)), simple in structure with it, good stability, advantages such as output pulse pulse width become the strong instrument of scientific research, but in many application studies field, as frequency comb, pump probe, Ah second's generation of Laser, laser pulse relevant synthetic often need the cycle magnitude and (or) femto-second laser pulse of high repetition frequency.Therefore, pursuing high repetition frequency few-cycle femtosecond laser technology and practical devices device, is significant content.
At present, can produce the common complex structure of laser of cycle magnitude pulse, components and parts are more, and repetition rate is low, and power output is low, and important components and parts are designed and produced by oneself mostly.For example MIT produces the work (document 2 of 5fs laser pulse; U.Morgner et al, Opt.Lett, 24,411, (1999)), adopting the two eyeglasses of warbling that design voluntarily, repetition rate is at 90MHz.Output average power 200mW.Rainbow (http://www.femtolasers.com/) the ultrashort laser device pulsewidth of Austria Femtolaser company is shorter than 7fs, but element is many in the chamber, comprise that outgoing mirror has 8 eyeglasses, and repetition rate is 80MHz.
Summary of the invention
Problem at the prior art existence, the purpose of this invention is to provide a kind of high repetition frequency and short pulse duration two aspects can being combined, can be in the requirement that reduces components and parts, the high repetition laser that when simplifying cavity configuration laser stability is greatly improved, it can satisfy frequency and comb requirements such as needed high repetition frequency, wide bandwidth.
For achieving the above object, the invention provides a kind of titanium-doped sapphire laser that produces high repetition frequency few-cycle femtosecond pulses, comprise a condenser lens, a laser gain crystal, two plano-concave broadbands total reflective mirror of warbling, be respectively the first plano-concave broadband total reflective mirror of warbling, the second plano-concave broadband total reflective mirror of warbling, plane, the two pairs of low-angle broadbands total reflective mirror of warbling, be respectively plane, the first low-angle broadband total reflective mirror of warbling, plane, the second low-angle broadband total reflective mirror of warbling, plane, the 3rd low-angle broadband total reflective mirror of warbling, plane, the 4th low-angle broadband total reflective mirror of warbling, a pair of low-angle wedge, the thin outgoing mirror of the low chromatic dispersion in broadband; Described condenser lens is used for incident beam is focused on described gain germ nucleus; Described gain crystal is placed on plano-concave respectively with Brewster's angle and warbles on the common focus of total reflective mirror; Plane, the described first low-angle broadband total reflective mirror of warbling is used for the warble light of total reflective mirror reflection of the second plano-concave broadband is reflexed to warble total reflective mirror and light is returned along former road of plane, the second low-angle broadband; Warbling between the light path of total reflective mirror in warble on plane, first low-angle broadband total reflective mirror and plane, the second low-angle broadband of described a pair of low-angle wedge, places with Brewster's angle, is used for accurately regulating the chamber internal dispersion; The thin outgoing mirror of the low chromatic dispersion in described broadband is used to make by the warble light part of total reflective mirror reflection of the first plano-concave broadband and is transmitted to plane, the 4th low-angle broadband total reflective mirror of warbling, all the other total reflective mirrors of warbling along the former road reflected back first plano-concave broadband; Total reflective mirror and plane, the 4th low-angle broadband parallel placement of total reflective mirror of warbling of warbling of plane, the 3rd low-angle broadband is carried out compression pulse with plane, the 4th low-angle broadband total reflective mirror of warbling to the light by the thin output mirror transmission of the low chromatic dispersion in broadband.
Further, the focal length of described condenser lens is 50mm, and bore is 25.4mm; Described gain crystal is the ti sapphire crystal of Brewster's angle cutting, is of a size of 3 * 2.8 * 1.85mm; The plano-concave broadband total reflective mirror of warbling is that radius of curvature is 50mm, bore is 12.7mm, thickness is the fused quartz glass of 6.35mm, and concave surface is coated with the anti-reflection and high anti-double-colored deielectric-coating of 700-950nm wave band to the 503-535nm wave band, and 680-940nm wave band 2nd order chromatic dispersion (GVD)-50fs is provided
2, the back side is coated with the anti-reflection film of 503-535nm wave band; Plane, the described low-angle broadband total reflective mirror of warbling is thickness 6.35mm, and bore is the fused quartz substrate of 25.4mm, and first, second plane, low-angle broadband total reflective mirror of warbling is coated with the 650-980nm wave band high instead, and the 650-980nm wave band provides 2nd order chromatic dispersion-40fs
2, warbling in plane, the 3rd, the 4th low-angle broadband, to be coated with the 580-1020nm wave band high anti-for total reflective mirror, and the 620-1000nm wave band provides 2nd order chromatic dispersion-50fs
2Described low-angle wedge is size 30 * 20mm, 2 ° 48 ' of angle, the fused quartz substrate of thinnest part 200 μ m; The thin outgoing mirror of the low chromatic dispersion in described broadband is bore 12.7mm, and thickness is the fused quartz substrate of 1mm, is coated with transmitance in the 660-920nm wave band and is 10% deielectric-coating.
Further, described gain crystal leads to light length 1.85mm, and the described broadband thin outgoing mirror thickness of low chromatic dispersion is 1mm.
Further, described low-angle wedge is regulated wedge insertion amount by stepping motor.
The present invention only uses 5 eyeglasses, and a gain crystal is formed resonant cavity, and all eyeglasses adopt commercial get final product, solved before this must the special chirped mirror of employing restriction.Owing to adopt components and parts to reduce, make cavity configuration more stable.Under the pumping laser of 5W, can obtain the output of average power greater than 500mW, typical pulse-widths can be less than 8fs, and repetition rate can reach 350MHz, spectral coverage 600-1000nm.This system configuration compactness is small and exquisite, and (size 400 * 250mm), locked mode is regulated easily simple.Its high repetition frequency and cycle magnitude pulsewidth characteristic provide a reliable light source for the difference frequency light comb.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:
Fig. 1 is a kind of schematic diagram that produces the titanium-doped sapphire laser of high repetition frequency few-cycle femtosecond pulses of the present invention;
Fig. 2 is the curve of spectrum of the laser pulse that is produced by laser of the present invention that measures with spectrometer;
The interference autocorrelator trace by the laser pulse of of the present invention laser generation of Fig. 3 for recording with the interference autocorrelation function analyzer.
Embodiment
Embodiment 1:
As shown in Figure 1, the invention provides a kind of titanium-doped sapphire laser that produces high repetition frequency few-cycle femtosecond pulses, comprise a condenser lens 1, a laser gain crystal 2, two plano-concave broadbands total reflective mirror of warbling, be respectively the first plano-concave broadband total reflective mirror 3 of warbling, the second plano-concave broadband total reflective mirror 4 of warbling, plane, the two pairs of low-angle broadbands total reflective mirror of warbling, be respectively plane, the first low-angle broadband total reflective mirror 5 of warbling, plane, the second low-angle broadband total reflective mirror 6 of warbling, plane, the 3rd low-angle broadband total reflective mirror 7 of warbling, plane, the 4th low-angle broadband total reflective mirror 8 of warbling, a pair of low-angle fused quartz wedge, be respectively first wedge 9, second wedge 10, thin 11, one base plates of outgoing mirror of the low chromatic dispersion in broadband.
First plano-concave broadband total reflective mirror 3, second plano-concave broadband total reflective mirror 4, plane, first low-angle broadband total reflective mirror 5, plane, the second low-angle broadband thin outgoing mirror 11 of the low chromatic dispersion of total reflective mirror 6 and broadband of warbling of warbling of warbling of warbling has constituted resonant cavity.Plane, the 3rd low-angle broadband total reflective mirror 7, plane, the 4th low-angle broadband total reflective mirror 8 of warbling of warbling constitutes the chamber external compression.
According to different needs, resonant cavity can select plane, the second low-angle broadband to warble the thin outgoing mirror 11 of the low chromatic dispersion of total reflective mirror 6 or broadband as outgoing mirror.
The concrete parameter of element is as follows: base plate size is 400 * 250mm, and the focal length of condenser lens 1 is 50mm, and bore is 25.4mm; The laser gain crystal 2 is the ti sapphire crystal of Brewster's angle cutting, is of a size of 3 * 2.8 * 1.85mm; First plano-concave broadband total reflective mirror 3, the second plano-concave broadband total reflective mirror 4 of warbling of warbling is 50mm for radius of curvature, bore is 12.7mm, thickness is the fused quartz glass of 6.35mm, concave surface is coated with the anti-reflection and high anti-double-colored deielectric-coating of 700-950nm wave band to the 503-535nm wave band, and 680-940nm wave band 2nd order chromatic dispersion GVD-50fs is provided
2, the back side is coated with the anti-reflection film of 503-535nm wave band; Plane, four the low-angle broadbands total reflective mirror of warbling is thickness 6.35mm, bore is the fused quartz substrate of 25.4mm, plane, first low-angle broadband total reflective mirror 5, plane, the second low-angle broadband total reflective mirror 6 of warbling of warbling is coated with the high inverse medium film of 650-980nm wave band, and the 650-980nm wave band provides 2nd order chromatic dispersion-40fs
2Plane, the 3rd low-angle broadband total reflective mirror 7, plane, the 4th low-angle broadband total reflective mirror 8 of warbling of warbling is coated with the high inverse medium film of 580-1020nm wave band, and the 620-1000nm wave band provides 2nd order chromatic dispersion-50fs
2Low- angle wedge 9,10 is 30 * 20mm, and angle is 2 ° 48 ', and thinnest part is the fused quartz substrate of 200 μ m.The thin outgoing mirror 11 of the low chromatic dispersion in broadband be bore 12.7mm, and thickness is the fused quartz substrate of 1mm, is coated with the interior transmitance of 660-920nm wave band and is 10% deielectric-coating.
All element is installed on the base plate, and whole laser generation light path is 6cm apart from the height of base plate.
Concrete installation requirement is as follows:
Regulate plane, the second low-angle broadband thin outgoing mirror 11 of the low chromatic dispersion in total reflective mirror 6 and broadband of warbling, incident ray is returned along former road, can realize the continuous oscillation of titanium precious stone laser.The locked mode running can be realized in condenser lens 1, the first plano-concave broadband of further optimizing pump light warble total reflective mirror 3, the second plano-concave broadband warble total reflective mirror 4 and laser gain crystal 2 position.Laser is from realizing by the warble lengthwise movement of total reflective mirror 5 of plane, the first low-angle broadband to the jump of lock film continuously.
Realizing regulating the insertion amount of wedge on the basis of locked mode, and finely tuning the first plano-concave broadband and warble the position of total reflective mirror 3 and laser gain crystal 2 so that output spectrum is the wideest.
As shown in Figure 2, it has covered the ultra-wide spectrum scope from 600nm～1050nm as can be seen from the curve of spectrum of the laser pulse that is produced by laser of the present invention that measures with spectrometer.
As shown in Figure 3, the interference autocorrelator trace of the laser pulse that is produced by laser of the present invention that records with the interference autocorrelation function analyzer shows pulse duration less than 8fs, corresponding about 3 optics cycles of oscillation.
Proposed by the invention a kind of produce high repetition frequency few-cycle femtosecond pulses to mix titanium blue precious The stone laser instrument is compared with traditional femto-second laser, need not prism to compensation of dispersion, but adopts Zhou The mirror locked mode compensation of dispersion of singing. In addition, element used in the present invention all is that commercialization can be buied, Need the designed, designed plated film to compare with eyeglass in other same devices, this is conducive to such laser system Batch production and popularization. End is got up, and main feature of the present invention has:
1, repetition rate height can reach 350MHz.
2, pulsewidth is short, can reach below the 8fs.
3, because pulsewidth of the present invention is short, spectral width can be used for difference frequency and frequently combs.
4, using eyeglass all is commercial eyeglasses of import and domestic production.
Claims (4)
1. titanium-doped sapphire laser that produces high repetition frequency few-cycle femtosecond pulses, it is characterized in that, comprise a condenser lens, a laser gain crystal, two plano-concave broadbands total reflective mirror of warbling, be respectively the first plano-concave broadband total reflective mirror of warbling, the second plano-concave broadband total reflective mirror of warbling, plane, the two pairs of low-angle broadbands total reflective mirror of warbling, be respectively plane, the first low-angle broadband total reflective mirror of warbling, plane, the second low-angle broadband total reflective mirror of warbling, plane, the 3rd low-angle broadband total reflective mirror of warbling, plane, the 4th low-angle broadband total reflective mirror of warbling, a pair of low-angle wedge, the thin outgoing mirror of the low chromatic dispersion in broadband; Described condenser lens is used for incident beam is focused on described gain germ nucleus; Described gain crystal is placed on plano-concave respectively with Brewster's angle and warbles on the common focus of total reflective mirror; Plane, the described first low-angle broadband total reflective mirror of warbling is used for the warble light of total reflective mirror reflection of the second plano-concave broadband is reflexed to warble total reflective mirror and light is returned along former road of plane, the second low-angle broadband; Warbling between the light path of total reflective mirror in warble on plane, first low-angle broadband total reflective mirror and plane, the second low-angle broadband of described a pair of low-angle wedge, places with Brewster's angle, is used for accurately regulating the chamber internal dispersion; The thin outgoing mirror of the low chromatic dispersion in described broadband is used to make by the warble light part of total reflective mirror reflection of the first plano-concave broadband and is transmitted to plane, the 4th low-angle broadband total reflective mirror of warbling, all the other total reflective mirrors of warbling along the former road reflected back first plano-concave broadband; Total reflective mirror and plane, the 4th low-angle broadband parallel placement of total reflective mirror of warbling of warbling of plane, the 3rd low-angle broadband is carried out compression pulse with plane, the 4th low-angle broadband total reflective mirror of warbling to the light by the thin output mirror transmission of the low chromatic dispersion in broadband.
2. the titanium-doped sapphire laser of generation high repetition frequency few-cycle femtosecond pulses according to claim 1 is characterized in that, the focal length of described condenser lens is 50mm, and bore is 25.4mm; Described gain crystal is the ti sapphire crystal of Brewster's angle cutting, is of a size of 3 * 2.8 * 1.85mm; The plano-concave broadband total reflective mirror of warbling is that radius of curvature is 50mm, bore is 12.7mm, thickness is the fused quartz glass of 6.35mm, and concave surface is coated with the anti-reflection and high anti-double-colored deielectric-coating of 700-950nm wave band to the 503-535nm wave band, and 680-940nm wave band 2nd order chromatic dispersion (GVD)-50fs is provided
2, the back side is coated with the anti-reflection film of 503-535nm wave band; Plane, the described low-angle broadband total reflective mirror of warbling is thickness 6.35mm, and bore is the fused quartz substrate of 25.4mm, and first, second plane, low-angle broadband total reflective mirror of warbling is coated with the 650-980nm wave band high instead, and the 650-980nm wave band provides 2nd order chromatic dispersion-40fs
2, warbling in plane, the 3rd, the 4th low-angle broadband, to be coated with the 580-1020nm wave band high anti-for total reflective mirror, and the 620-1000nm wave band provides 2nd order chromatic dispersion-50fs
2Described low-angle wedge is size 30 * 20mm, 2 ° 48 ' of angle, the fused quartz substrate of thinnest part 200 μ m; The thin outgoing mirror of the low chromatic dispersion in described broadband is bore 12.7mm, and thickness is the fused quartz substrate of 1mm, is coated with transmitance in the 660-920nm wave band and is 10% deielectric-coating.
3. the titanium-doped sapphire laser of generation high repetition frequency few-cycle femtosecond pulses according to claim 1 is characterized in that, described gain crystal leads to light length 1.85mm, and the described broadband thin outgoing mirror thickness of low chromatic dispersion is 1mm.
4. the titanium-doped sapphire laser of generation high repetition frequency few-cycle femtosecond pulses according to claim 1 is characterized in that, described low-angle wedge is regulated wedge insertion amount by stepping motor.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102844941A (en) * | 2010-02-24 | 2012-12-26 | 爱尔康手术激光股份有限公司 | High power femtosecond laser with adjustable repetition rate and simplified structure |
| CN102879969A (en) * | 2012-09-27 | 2013-01-16 | 中国科学院物理研究所 | Optical frequency comb on basis of spectral shaping self difference frequency generation technology |
| CN102967274A (en) * | 2012-11-14 | 2013-03-13 | 广东汉唐量子光电科技有限公司 | Method for measuring object surface topography |
| CN103762496A (en) * | 2014-01-06 | 2014-04-30 | 中国科学院物理研究所 | Astronomical optical frequency comb device based on all-solid femtosecond laser |
| CN104201548A (en) * | 2014-08-12 | 2014-12-10 | 中国科学院物理研究所 | Kerr lens mode locking Ti (Titanium) sapphire laser unit of 488nm laser pumping |
| CN108075349A (en) * | 2016-11-15 | 2018-05-25 | 中国科学院光电研究院 | A kind of picosecond laser of conveniently adjusted laser pulse width |
| CN110120622A (en) * | 2019-05-20 | 2019-08-13 | 西安电子科技大学 | A kind of 10 femtosecond Ti:Sapphire oscillator of the Asia that laser diode directly pumps |
| CN112362173A (en) * | 2020-11-18 | 2021-02-12 | 中国航空工业集团公司北京长城计量测试技术研究所 | Laser wavelength measuring device and method based on difference frequency double combs |
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2008
- 2008-06-30 CN CN2008101159109A patent/CN101621172B/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102844941A (en) * | 2010-02-24 | 2012-12-26 | 爱尔康手术激光股份有限公司 | High power femtosecond laser with adjustable repetition rate and simplified structure |
| CN102879969A (en) * | 2012-09-27 | 2013-01-16 | 中国科学院物理研究所 | Optical frequency comb on basis of spectral shaping self difference frequency generation technology |
| CN102967274A (en) * | 2012-11-14 | 2013-03-13 | 广东汉唐量子光电科技有限公司 | Method for measuring object surface topography |
| CN103762496A (en) * | 2014-01-06 | 2014-04-30 | 中国科学院物理研究所 | Astronomical optical frequency comb device based on all-solid femtosecond laser |
| CN103762496B (en) * | 2014-01-06 | 2016-05-25 | 中国科学院物理研究所 | Astronomicalc optics frequency comb device based on all solid state femto-second laser |
| CN104201548A (en) * | 2014-08-12 | 2014-12-10 | 中国科学院物理研究所 | Kerr lens mode locking Ti (Titanium) sapphire laser unit of 488nm laser pumping |
| CN108075349A (en) * | 2016-11-15 | 2018-05-25 | 中国科学院光电研究院 | A kind of picosecond laser of conveniently adjusted laser pulse width |
| CN110120622A (en) * | 2019-05-20 | 2019-08-13 | 西安电子科技大学 | A kind of 10 femtosecond Ti:Sapphire oscillator of the Asia that laser diode directly pumps |
| CN112362173A (en) * | 2020-11-18 | 2021-02-12 | 中国航空工业集团公司北京长城计量测试技术研究所 | Laser wavelength measuring device and method based on difference frequency double combs |
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