CN1271756C - Microstructure fibre-optical femto second white light laser generator - Google Patents
Microstructure fibre-optical femto second white light laser generator Download PDFInfo
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- CN1271756C CN1271756C CN 200410018688 CN200410018688A CN1271756C CN 1271756 C CN1271756 C CN 1271756C CN 200410018688 CN200410018688 CN 200410018688 CN 200410018688 A CN200410018688 A CN 200410018688A CN 1271756 C CN1271756 C CN 1271756C
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- optical fibers
- microstructure optical
- white light
- microstructured optical
- femtosecond
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Abstract
The present invention discloses a microstructure optical fiber femtosecond white light laser generator which belongs to the technical fields of ultra-fast lasers and non-linear optics. The microstructure optical fiber femtosecond white light laser generator comprises a self-starting mode-locked laser and microstructure optical fibers. The microstructure optical fiber femtosecond white light laser generator is characterized in that an isolator is arranged in a light path of femtosecond laser output to the microstructure optical fibers; a coupling lens and a coaxial imaging monitoring system are respectively arranged on the input end and the output end of the microstructure optical fibers; the air ratio of the microstructure optical fibers is more than 60% and the diameter of each microstructure optical fiber is smaller than 2 um. The present invention has the advantages of simple starting and stable operation; the coaxial imaging monitoring system can simply and accurately couple femtosecond laser pulses into the cores of the microstructure optical fibers; the jitter performance of an output spectrum is small; the microstructure optical fibers with high air ratio and small fiber cores are used, so the reinforced nonlinear effect of the microstructure optical fiber femtosecond white light laser generator can widen the spectrum in short optical fiber distance, and the transmission loss can be correspondingly reduced.
Description
Technical field
The present invention relates to a kind of microstructured optical fibers femtosecond white light laser generator, belonged to ultrafast laser technique and non-linear optical field.
Background technology
Microstructured optical fibers (Microstructure fiber) is called photonic crystal fiber (Photonic Crystal fiber) again, perhaps porous optical fiber (Holey fiber).In microstructured optical fibers, light field is by in the pocket of airport height local around the fibre core, enhancing nonlinear effect that can be very strong.The nonlinear effect of this enhancing and controlled dispersion characteristics make it become the effective means that produces the super continuum light spectrum---compose through the femto-second laser pulse of burnt magnitude just can produce an octave (octave) even two octaves in optical fiber the super continuum light of receiving that amplifies.Since Ranka etc. is reported in the super continuum light spectrum that produces two octaves (390nm to 1600nm) in the microstructured optical fibers, in microstructured optical fibers, produce the super continuum light spectrum and just become a new research focus, and the super continuum light spectrum is measured at phase stabilization, the optical frequency of control femto-second laser pulse, important breakthrough has been brought in optical coherence tomography aspects such as (OCT), and increasing attentiveness attracted on the video stretching that utilizes femto-second laser pulse in the microstructured optical fibers.In addition, the super continuum light spectrum has great application potential at aspects such as optical communication, ultrashort pulse compression, laser spectroscopy, sensing technologies.About the document that relates to the technology of the present invention and report as follows:
[1]、J.C.Knight，et.al.Optics?Letters，Vol.21?Issue?19(October?1996)Page?1547
[2]、Jinendra?K.Ranka?et.al?Optics?Letters，Vol.25?Issue?1(January?2000)Page?25
[3]、D?J?Jones?et?al..Science，288：635
[4]、S?A?Diddams?et?al.Phy.Rev.Lett.，2000，84：5102
[5]、I?Hartl?et?al.Optics?Letters.，2001，26：608
Summary of the invention
The object of the present invention is to provide a kind of microstructured optical fibers femtosecond white light laser generator.This laser generator not only can produce ultra broadband, super smooth ultrashort laser pulse light source.And have stable and characteristics simple to operate of running.
The present invention is realized by the following technical programs: comprise the mode-locked laser of self-starting, the super continuous white light generator that microstructured optical fibers constitutes, it is characterized in that: export in the light path of microstructured optical fibers at femto-second laser, isolator is set, and, coupled lens is set and the coaxial imaging monitoring system of the microstructured optical fibers end face that constitutes by beam splitting chip and CCD watch-dog respectively at the input and output side of microstructured optical fibers; The air ratio of employed microstructured optical fibers is 80%, and core diameter is less than 2um;
Above-mentioned coupled lens is that 20 times, numerical aperture are that 0.25 or 40 times, numerical aperture are that 0.65 or 60 times, numerical aperture are 0.8 coupled lens;
The beam splitting chip of above-mentioned coaxial supervisory control system is that reflectivity is 2～10% beam splitting chip;
Advantage of the present invention: 1, start simply, use the femto-second laser of semiconductor saturable absorber SESAM (SemiconductorSaturabe Mirror) can the steady running of self-starting locked mode; 2, isolator can guarantee that laser operation is not subjected to the influence of feedback light; 3, coaxial imaging monitoring system can be coupled to femto-second laser pulse in the microstructured optical fibers fibre core simply accurately; 4, the adjusting knob of the part of the arrangement optical fiber of design and high precision high stability guarantees the stable and repeatable of coupling voluntarily, and guarantees that the jitter of output spectrum is very little; 5, use microstructured optical fibers with high air ratio, little fibre core (air ratio be 80%, core diameter 2um), the enhancing nonlinear effect that it has guarantees in very short fiber distance spectrum widening, and can corresponding minimizing loss.
Description of drawings
Fig. 1 microstructured optical fibers femtosecond white light laser generator apparatus structure block diagram.1 is the femtosecond laser oscillator of self-starting among the figure, and 2 is isolator, and 3,4 is total reflective mirror, and 5,10 is beam splitting chip, and 7,9 is coupled lens, and 8 is the microstructured optical fibers device, and 6,11 is the CCD watch-dog.
The super continuous white-light spectrum figure that the 50cm microstructured optical fibers produces among Fig. 2 the present invention.From the visible spectrum width of Fig. 2 from 420nm to 1100nm, greater than an octave.
Fig. 3 is the electronic scanning micrograph of the microstructured optical fibers end face of femtosecond white light laser use.
Embodiment
A whole set of instrument can be monitored the coaxial imaging monitoring system of microstructured optical fibers end face by the mode-locked laser of the self-starting that can stablize the output femto-second laser pulse, prevents that feedback light from influencing the isolator of locked mode and having the microstructured optical fibers composition that strengthens nonlinear effect.At first the femto-second laser pulse of oscillator stage output outputs to the coupled lens place by isolator.Input/output terminal all uses the beam splitting chip beam split of reflectivity 5% that the coupling situation is carried out image supervisory control.Use 40 times, the coupled lens of numerical aperture 0.65 is coupled to femto-second laser pulse in the microstructured optical fibers fibre core, and adopts the CCD monitor to carry out coaxial image supervisory control coupling position, utilizes power meter monitoring coupling input efficiency.Because what take place when microstructured optical fibers and femtosecond laser interact modulates and the effect of the nonlinear effect of many enhancings such as self-steeping from phase modulated, higher-order soliton division, four wave mixing, cross-phase, the input spectrum width is that the femto-second laser pulse of 24nm is at the air ratio with 80%, core diameter is less than after transmitting 50cm in the microstructured optical fibers of 2.2um, its spectrum spectrum widening arrives greater than 600nm, flatness is in the 10dB scope, promptly obtained super smooth super continuous white light, spectrum such as Fig. 2.When input power 500mW, can arrive the super continuous white light output of 100mW, and have the light beam space quality of good single mode field distribution.
Claims (3)
1, a kind of microstructured optical fibers femtosecond white light laser generator, this generator comprises mode-locked laser, the microstructured optical fibers of self-starting, it is characterized in that: export in the light path of microstructured optical fibers at femto-second laser, isolator is set, and, coupled lens is set and the coaxial imaging monitoring system of the microstructured optical fibers end face that constitutes by beam splitting chip and CCD watch-dog respectively at the input and output side of microstructured optical fibers; The air ratio of employed microstructured optical fibers is 80%, and core diameter is less than 2um.
2, by the described microstructured optical fibers femtosecond of claim 1 white light laser generator, it is characterized in that: coupled lens is that 20 times, numerical aperture are that 0.25 or 40 times, numerical aperture are that 0.65 or 60 times, numerical aperture are 0.8 coupled lens.
3, by the described microstructured optical fibers femtosecond of claim 1 white light laser generator, it is characterized in that: the beam splitting chip of coaxial supervisory control system is that reflectivity is 2～10% beam splitting chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200410018688 CN1271756C (en) | 2004-02-26 | 2004-02-26 | Microstructure fibre-optical femto second white light laser generator |
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| CN 200410018688 CN1271756C (en) | 2004-02-26 | 2004-02-26 | Microstructure fibre-optical femto second white light laser generator |
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| CN1560965A CN1560965A (en) | 2005-01-05 |
| CN1271756C true CN1271756C (en) | 2006-08-23 |
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| CN 200410018688 Expired - Fee Related CN1271756C (en) | 2004-02-26 | 2004-02-26 | Microstructure fibre-optical femto second white light laser generator |
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| CN102436043A (en) * | 2011-12-23 | 2012-05-02 | 中国科学院长春光学精密机械与物理研究所 | Electrooptical countermeasure infield simulation-based low level laser transformation system |
| CN103658975B (en) * | 2013-12-03 | 2017-02-15 | 张立国 | Laser beam splitting and processing device |
| CN103706946B (en) * | 2013-12-03 | 2016-09-07 | 张立国 | A kind of laser beam splitter vibration mirror scanning processing unit (plant) |
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