CN1917306A - Adjustable femtosecond pulse generator in dual wavelengh synchronized accuratly - Google Patents
Adjustable femtosecond pulse generator in dual wavelengh synchronized accuratly Download PDFInfo
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- CN1917306A CN1917306A CN 200610015298 CN200610015298A CN1917306A CN 1917306 A CN1917306 A CN 1917306A CN 200610015298 CN200610015298 CN 200610015298 CN 200610015298 A CN200610015298 A CN 200610015298A CN 1917306 A CN1917306 A CN 1917306A
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Abstract
The laser pulse generator includes following parts and structures: laser in femtosecond; isolator setup at output end of the laser in femtosecond; holophote and beam splitter setup in sequence from the output end of the isolator; self frequency shift soliton generator composed of coupling lens, microstructure optical fiber and coupling lens is setup on one optical path from beam splitter; filter for passing 1000-1100nm pulse light is setup at output end of the said soliton generator; holophote and delay line of compensating time with accuracy are setup on the other optical path from beam splitter. In simple structure, and stable operation, the invention generates synchronous high precision laser pulse in femtosecond magnitude, which is higher more than three orders of magnitude compared with current electronic pulse synchronizer.
Description
Technical field
The present invention relates to a kind of adjustable femtosecond pulse generator in dual wavelengh synchronized accuratly, belonged to ultrafast laser pulse generator technology.
Background technology
The precision (needing a series of electronic motion processes such as electronics triggering) of electronics synchronizer commonly used has only nanosecond or hundred picosecond magnitudes at present, can not satisfy the demand of current some ultrafast subject, therefore needs the raising synchronization accuracy badly.And the new focus of current nonlinear optical fiber, microstructured optical fibers provides a new technical foundation (synchronizing process of a full light is provided) for this technology.Microstructured optical fibers (Microstructure fiber), be called photonic crystal fiber (Photonic Crystal fiber) again, perhaps porous optical fiber (Holey fiber) is a kind ofly to be made of homogenous material, has the periodically novel optical fiber of micron dimension airport structure in the covering.In this optical fiber, light field, can be strengthened nonlinear effect very consumingly, and be subjected to the influence of surrounding air pore structure in the pocket around the fibre core by airport height local, and its dispersion characteristics can artificially be controlled easily.The nonlinear effect of this enhancing and controlled dispersion characteristics make this optical fiber be fit to very much orphan's generation and transmission.The femto-second laser pulse of burnt magnitude received can produce the self-frequency shift orphan at infrared band expeditiously by high-order nonlinear interactions such as Raman effects in microstructured optical fibers.This self-frequency shift orphan can control its walking from the time with respect to pump light by the parameter of control optical fiber and ultrashort laser pulse.Under preset parameter, this walks from the time is a quite accurate numerical value, can be accurate to the femtosecond magnitude, utilizes this non-linear self-frequency shift effect can constitute the high precision time synchronization device.The time synchronism apparatus of femtosecond magnitude has very for the ultrashort pulse technology that needs precise synchronization, photochemistry, photobiology etc., and important use is worth, and can greatly widen femtosecond laser technology range of application, in the ultrafast research in fields such as physics, chemistry, biology, all be with a wide range of applications.About the document that relates to the technology of the present invention and report as follows:
1.Serebryannikov，E.E.，et?al.，Journal?of?Raman?Spectroscopy，2006.37(1-3)：p.416-420.
2.Liu，X.，et?al.，Optics?Letters，2001.26(6)：p.358-360.
3.Wadsworth，W.J.，et?al.，Electronics?Letters，2000.36(1)：p.53-55.
4.Fiorentino，M.，et?al.，Optics?Letters，2002.27(8)：p.649-651.
5.Serebryannikov，E.E.，et?al.，Applied?Physics?B-Lasers?And?Optics，2005.81(5)：p.585-588.
Summary of the invention
The object of the present invention is to provide a kind of adjustable femtosecond pulse generator in dual wavelengh synchronized accuratly.This pulse generator can produce near the two ultra-short pulse lasers of wavelength 800nm and 1050nm at infrared band, and this two bundles laser pulse can reach the femtosecond magnitude by synchronization accuracy in time, and has the stable and characteristics simple to operate of running.
The present invention is realized by the following technical programs: a kind of adjustable femtosecond pulse generator in dual wavelengh synchronized accuratly, it is characterized in that: the output that comprises femto-second laser 1, femto-second laser is provided with isolator 2, the isolator output sets gradually total reflective mirror 3 and beam splitting chip 4, the self-frequency shift orphan generator of being made up of coupled lens 5, microstructured optical fibers 6 and coupled lens 7, the filter 8 of the only saturating 1000～1100nm pulsed light of output setting of this self-frequency shift orphan generator are being set on a beam optical path of beam splitting chip 4 beam splitting; Total reflective mirror 9 and chronometer time delay compensation line 10 are being set on another beam optical path of beam splitting chip 4 beam splitting.
The core diameter of above-mentioned microstructured optical fibers 6 is 1.5～2.5um, and length is 50～100cm, covering air ratio 60%～80%.
It is that 0.25,40 times numerical aperture is that 0.65 or 60 times numerical aperture is 0.8 coupled lens that above-mentioned coupled lens 5 and coupled lens 7 are respectively 20 times numerical aperture, or two coupled lens are that 20 times numerical aperture is that 0.25,40 times numerical aperture is that 0.65 or 60 times numerical aperture is 0.8 coupled lens simultaneously.
Above-mentioned beam splitting chip reflectivity is 40～60%.
Advantage of the present invention: femto-second laser adopts the titanium-doped sapphire laser with kerr lens effect locked mode, easily starts, and running is stable; This pulse generator can produce near the two ultra-short pulse lasers of wavelength 800nm and 1050nm at infrared band, this two bundles laser pulse can reach the femtosecond magnitude by synchronization accuracy in time, improved 3 more than the order of magnitude than present used electronic impulse synchronizer, and simple to operate.
Description of drawings
Fig. 1 is the adjustable femtosecond pulse generator in dual wavelengh synchronized accuratly structured flowchart.1 is the femtosecond laser oscillator among the figure, and 2 is isolator, and 3,9 is total reflective mirror, and 4 is beam splitting chip, and 5,7 is coupled lens, and 6 is the microstructured optical fibers device, and 8 for only allowing the filter of 1000～1100nm pulse full impregnated, and 10 is chronometer time delay compensation line.
The end face ESEM micrograph of microstructured optical fibers among Fig. 2 the present invention.
The spectrogram of the 1050nm soliton pulse of 800nm pumping pulse and generation among Fig. 3 the present invention.
Among Fig. 4 the present invention 1050nm pulse orphan by optical fiber after walking with respect to the 800nm pulse from time diagram.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in detail:
A whole set of instrument is by stablizing output pulse width 15～100fs, single pulse energy 2～10nJ, the titanium-doped sapphire laser 1 of the femto-second laser pulse of repetition rate 60～120MHz, prevent that feedback light from influencing the isolator 2 of locked mode (being made of Faraday polarization apparatus, half-wave plate and the polarizer), can near the centre wavelength 800nm of the femtosecond laser that the titanium-doped sapphire mode-locked laser is exported, provide negative dispersion and have the microstructured optical fibers 6 of enhancing nonlinear effect and chronometer time delay compensation line 10 compositions of single step precision micron dimension.At first the femto-second laser pulse of femto-second laser output outputs to coupled lens 7 places by isolator.Before Lens Coupling, use the beam splitting chip 4 of reflectivity 40% or 50% or 60% that the 800nm femtosecond laser is divided into two bundles.The numerical aperture of using 20 times is that 0.25 or 40 times numerical aperture is that 0.65 or 60 times numerical aperture is 0.8 coupled lens 5, the input that a branch of femto-second laser pulse wherein is coupled to microstructured optical fibers 6 enters in the fibre core of optical fiber 6, under high-order nonlinear interactions such as Raman effect, produce the self-frequency shift orphan of centre wavelength at 1000～1100nm.The self-frequency shift orphan of the 1000～1100nm that is produced is from optical fiber 6 outputs output, is that 0.25 or 40 times numerical aperture is that 0.65 or 60 times numerical aperture is 0.8 coupled lens 7 coupling outputs by 20 times numerical apertures.Use the filter 8 of only saturating 1000～1100nm pulsed light that non-self-frequency shift orphan light is filtered, this road light is had to the self-frequency shift orphan of 1000～1100nm at last.Go into to inject delay line 10 by other a branch of 800nm femtosecond laser that the beam splitting chip 4 of reflectivity 40% or 50% or 60% is told by total reflective mirror 9, compensate the self-frequency shift orphan's of these Lu Guangyu last one tunnel 1000～1100nm time difference by delay line 10.Obtain like this from the self-frequency shift soliton pulse of the 800nm femtosecond laser of delay line 10 outgoing and another road 1000～1100nm synchronous accurately in time, synchronization accuracy femtosecond magnitude.
Claims (4)
1. adjustable femtosecond pulse generator in dual wavelengh synchronized accuratly, it is characterized in that: comprise femto-second laser (1), the output of femto-second laser is provided with isolator (2), the isolator output sets gradually total reflective mirror (3) and beam splitting chip (4), the self-frequency shift orphan generator of being made up of coupled lens (5), microstructured optical fibers (6) and coupled lens (7), the filter (8) of the only saturating 1000～1100nm pulsed light of output setting of this self-frequency shift orphan generator are being set on a beam optical path of beam splitting chip (4) beam splitting; Total reflective mirror (9) and chronometer time delay compensation line (10) are being set on another beam optical path of beam splitting chip (4) beam splitting.
2. by the described adjustable femtosecond pulse generator in dual wavelengh synchronized accuratly of claim 1, it is characterized in that: the core diameter of microstructured optical fibers (6) is 1.5～2.5um, and length is 50～100cm, covering air ratio 60%～80%.
3. by the described adjustable femtosecond pulse generator in dual wavelengh synchronized accuratly of claim 1, it is characterized in that: it is that 0.25,40 times numerical aperture is that 0.65 or 60 times numerical aperture is 0.8 coupled lens that coupled lens (5) and coupled lens (7) are respectively 20 times numerical aperture, or two coupled lens are that 20 times numerical aperture is that 0.25,40 times numerical aperture is that 0.65 or 60 times numerical aperture is 0.8 coupled lens simultaneously.
4. by the described adjustable femtosecond pulse generator in dual wavelengh synchronized accuratly of claim 1, it is characterized in that: the beam splitting chip reflectivity is 40～60%.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101599610B (en) * | 2008-06-04 | 2011-01-26 | 中国科学院物理研究所 | Precise active synchronization unit of different ultrashort pulse lasers |
| CN104201549A (en) * | 2014-07-24 | 2014-12-10 | 深圳大学 | Wavelength space adjustable double-color soliton pulse light source system |
| CN105207048A (en) * | 2015-09-21 | 2015-12-30 | 苏州龙格库塔光电科技有限公司 | Full-fabric wavelength-tunable ultrashort-pulse laser |
| CN105446120A (en) * | 2015-11-25 | 2016-03-30 | 天津大学 | Optical fiber link time-frequency distribution device based on femtosecond laser and stabilizing method thereof |
| CN105896248A (en) * | 2016-05-10 | 2016-08-24 | 西北大学 | High-power tunable 1.7mum mode-locked fiber laser |
| CN109346913A (en) * | 2018-09-06 | 2019-02-15 | 天津大学 | A kind of round trip flight second laser optics frequency comb locking device based on fibre delay line |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1284284C (en) * | 2003-12-23 | 2006-11-08 | 中国科学院物理研究所 | High precison femtosecond synchronous technology and device |
| CN1570749A (en) * | 2004-04-30 | 2005-01-26 | 天津大学 | Tunable femtosecond laser frequency transformer |
-
2006
- 2006-08-10 CN CNB2006100152989A patent/CN100426603C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101599610B (en) * | 2008-06-04 | 2011-01-26 | 中国科学院物理研究所 | Precise active synchronization unit of different ultrashort pulse lasers |
| CN104201549A (en) * | 2014-07-24 | 2014-12-10 | 深圳大学 | Wavelength space adjustable double-color soliton pulse light source system |
| CN104201549B (en) * | 2014-07-24 | 2017-01-25 | 深圳大学 | Wavelength space adjustable double-color soliton pulse light source system |
| CN105207048A (en) * | 2015-09-21 | 2015-12-30 | 苏州龙格库塔光电科技有限公司 | Full-fabric wavelength-tunable ultrashort-pulse laser |
| CN105446120A (en) * | 2015-11-25 | 2016-03-30 | 天津大学 | Optical fiber link time-frequency distribution device based on femtosecond laser and stabilizing method thereof |
| CN105896248A (en) * | 2016-05-10 | 2016-08-24 | 西北大学 | High-power tunable 1.7mum mode-locked fiber laser |
| CN105896248B (en) * | 2016-05-10 | 2018-11-27 | 西北大学 | A kind of 1.7 μm of mode locked fiber lasers of high power tunable |
| CN109346913A (en) * | 2018-09-06 | 2019-02-15 | 天津大学 | A kind of round trip flight second laser optics frequency comb locking device based on fibre delay line |
| CN109346913B (en) * | 2018-09-06 | 2020-10-27 | 天津大学 | Double-femtosecond laser optical frequency comb locking device based on optical fiber delay line |
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