CN101414726A - Picopulse optical fiber laser - Google Patents
Picopulse optical fiber laser Download PDFInfo
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- CN101414726A CN101414726A CNA2008102221056A CN200810222105A CN101414726A CN 101414726 A CN101414726 A CN 101414726A CN A2008102221056 A CNA2008102221056 A CN A2008102221056A CN 200810222105 A CN200810222105 A CN 200810222105A CN 101414726 A CN101414726 A CN 101414726A
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- optical fiber
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- fiber laser
- laser
- balzed grating
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Abstract
The invention discloses a picosecond pulse optical fibre laser which comprises a main cavity resonator and an outer cavity feedback part. A semiconductor laser is adopted as a pumping source; a dichroic mirror and double envelope optical fibre mixing with ytterbium form the main cavity resonator which is coupled to an outer cavity through a collimating lens; a acoustooptic modulator AOM in the outer cavity adopts Raman-Nath diffraction; and a blazed grating outputs zero-level diffraction light generated by a signal light and feeds back any level light in high-level light to the cavity resonator. The invention has simple structure and high cost performance, can realize wide-tune, narrow-line-width and stable picosecond pulse laser output and can be widely applied to the fields of laser processing, laser medical treatment, laser marking, seed light source, etc.
Description
Technical field
The present invention relates to a kind of laser technology, relate in particular to a kind of Picopulse optical fiber laser.
Background technology
The psec of broad tuning, narrow linewidth (ps) pulse Yb-doping double-clad optical fiber laser has huge using value at the aspects such as seed light source of laser processing, THz wave and femto-second laser.Picopulse optical fiber laser has that threshold value is low, low noise, high s/n ratio, miniaturization and need not unrivaled advantages such as refrigeration, and the Picopulse optical fiber laser that particularly utilizes Yb dosed optical fiber to make becomes the light source that haves a great attraction in THz wave and the femto-second laser seed light source in recent years.
In the Picopulse optical fiber laser of the prior art, a kind of is the active mode locking fiber laser, and what AOM (acousto-optic modulator) adopted is Bragg (Prague) diffraction, and zero order light and one-level light only occur behind the process AOM diffraction this moment, one-level light feeds back in the chamber via grating, zero order light output.
There is following shortcoming at least in above-mentioned prior art: the pulse period is depended on the radio frequency operation frequency of AOM, and the repetition rate of the psec light pulse of output is lower.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can export the more Picopulse optical fiber laser of the psec light pulse of high repetition frequency.
The objective of the invention is to be achieved through the following technical solutions:
Picopulse optical fiber laser of the present invention comprises main resonance cavity, exocoel feedback fraction, and the exocoel feedback fraction comprises acousto-optic modulator AOM, described AOM adopts this diffraction of Raman-how, in the diffraction light that is produced, zero order light output, the arbitrary level in the senior light feeds back in the described main resonance cavity.
As seen from the above technical solution provided by the invention, Picopulse optical fiber laser of the present invention is because acousto-optic modulator AOM adopts this diffraction of Raman-how, in the diffraction light that is produced, zero order light output, the arbitrary level in the senior light feeds back in the main resonance cavity.Can export the more psec light pulse of high repetition frequency.
Description of drawings
Fig. 1 is the structural representation of the main resonance cavity of Picopulse optical fiber laser of the present invention;
Fig. 2 is the structural representation of the exocoel feedback fraction of Picopulse optical fiber laser of the present invention;
Fig. 3 is the schematic diagram that concerns between the pulse energy of the output laser in the specific embodiments of the invention and the tuning wavelength;
Time domain performance chart when Fig. 4 is Picopulse optical fiber laser of the present invention running.
Embodiment
Picopulse optical fiber laser of the present invention, its preferable embodiment are to comprise main resonance cavity, exocoel feedback fraction.
Wherein, the exocoel feedback fraction comprises AOM (acousto-optic modulator), AOM adopt Raman-Nath (diffraction of Raman-Nai Si), in the diffraction light that is produced, zero order light output, the arbitrary level in the senior light feeds back in the main resonance cavity.The laser of main resonance cavity output can impinge perpendicularly on the plane of crystal of AOM behind the collimating lens collimation.Senior light can be the arbitrary level in 2 grades of light, 3 laser to the 5 grade light, also can be more senior time diffraction light.The modulating frequency of AOM can be more than or equal to 40MHz.
As shown in Figure 1, main resonance cavity can comprise dichroscope 3, yb-doped double-clad fiber 4.
In the specific embodiment, main resonance cavity can comprise semiconductor laser 1, coupled system 2, dichroscope 3 and yb-doped double-clad fiber 4 from left to right successively.Semiconductor laser 1 is a pumping source, and excitation wavelength can be 975nm.
A chamber mirror of main resonance cavity is a dichroscope 3, the tail end vertical cut end face A that another chamber mirror is a yb-doped double-clad fiber 4, the feedback that the Fresnel reflection of tail end vertical cut end face A provides can make semiconductor laser 1 starting of oscillation, and dichroscope 3 and double clad Yb dosed optical fiber 4 itself have just constituted resonant cavity like this.Pump light enters in the resonant cavity through coupled system 2.
The length of yb-doped double-clad fiber 4 can be 20m, and doping content can be 0.65mol%, and the absorption coefficient at the 975nm place can be 5dB/m.Yb-doped double-clad fiber can be single transverse mode optical fiber.
The parameter of dichroscope 3 is: the reflectivity at the 975nm place can be 97%, and the reflectivity at the 1064nm place can be 0.2%.
As shown in Figure 2, the exocoel feedback fraction can comprise balzed grating, 7, and balzed grating, 7 is used for the diffraction light of feedback and output AOM (acousto-optic modulator 6) generation.
In the specific embodiment, the exocoel feedback fraction can comprise collimating lens 5, acousto-optic modulator 6 (AOM) and reflective balzed grating, 7 from left to right successively.The laser of main resonance cavity output outputs to the exocoel feedback fraction through yb-doped double-clad fiber 4, becomes directional light behind collimating lens 5 collimations, incides on the balzed grating, 7 through acousto-optic modulator 6.7 pairs of corresponding excitation wavelengths of balzed grating, produce reflective diffraction, and the horizontal rotatio direction of regulating balzed grating, 7 makes zero order light export, and the arbitrary level in the senior light feeds back in the described main resonance cavity.Among the present invention, because acousto-optic modulator AOM adopts this diffraction of Raman-how, in the diffraction light that is produced, zero order light output, one or more in the senior light feed back in the main resonance cavity, can export the more psec light pulse of high repetition frequency.
Balzed grating, 7 can be reflective balzed grating,, by accommodation reflex formula balzed grating, 7, can realize the tuning of output laser and pressure narrow linewidth.The centre wavelength of reflective balzed grating, 7 can be 1064nm, and senior diffraction of light efficient can be 35%.
Concrete reflective balzed grating, 7 can be provided with the whirligig of arrangement for adjusting height and horizontal direction.On the workbench of the rotation that reflective balzed grating, 7 also can be fixed on highly and can regulate, horizontal direction is passable, by height and horizontal direction realization broad tuning, narrow linewidth and the stable laser pulse output of accommodation reflex formula balzed grating, 7.
In the specific embodiments of the invention, the chamber length of main resonance cavity can for the long positive integer in the chamber of exocoel feedback fraction doubly.The long distance of the tail end vertical cut end face A of yb-doped double-clad fiber 4 that promptly refer in the chamber of exocoel feedback fraction to balzed grating, 7; The chamber length of main resonance cavity refers to the distance of dichroscope 3 to the tail end vertical cut end face A of yb-doped double-clad fiber 4.
The chamber length of frequency displacement feedback cavity and the product of the frequency displacement in the chamber can equal π, and the chamber length of frequency displacement feedback cavity refers to the distance of dichroscope 3 to balzed grating, 7.
In the prior art, AOM adopts the Bragg diffraction, plane of crystal and the non-normal incidence of incident laser and AOM when the Bragg diffraction phenomena takes place.Zero order light and one-level light only occur through behind the AOM, one-level light feeds back in the chamber via grating, zero order light output, and pulse period this moment is depended on the radio frequency operation frequency of AOM.
Among the present invention, laser vertical incides plane of crystal in the AOM, the Raman-Nath diffraction takes place through laser behind the crystal, zero order light, one-level light are not only arranged, even there are other senior time light (4,5 grades light etc.) also can outgoing, a certain senior time light is fed back in the chamber, zero order light output, the frequency shift amount between incident light and the diffraction light no longer has been the frequency of AOM radiofrequency signal at this moment.Equal π according to the chamber length of frequency displacement feedback and the frequency displacement product in the chamber again, can produce picopulse equally.If when the main resonance cavity chamber is long when covering with the certain positive integer proportionate relationship of foot with outer cavity, the repetition rate of generation pulse is the product of this positive integer and senior optical frequency shift amount.
Therefore, can obtain the more output psec light pulse of high repetition frequency, and the off resonance scope that allows is bigger, can in the scope of broad, carries out tuningly, generally can reach tens nanometers.Simple in structure, cost performance is high, can realize broad tuning, narrow linewidth, stable picosecond pulse laser output.Can be widely used in fields such as laser processing, laser medicine, laser marking, seed light source.
As shown in Figure 3, be the pulse energy of the output laser of specific embodiments of the invention and the relation between the tuning wavelength.Therefrom tuning range broad has as can be seen reached 60nm.
As shown in Figure 4, the repetition 1GHz that obtains for Picopulse optical fiber laser of the present invention running, the time domain specification of pulsewidth 40ps laser can obtain stable picosecond pulse laser.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (10)
1, a kind of Picopulse optical fiber laser, comprise main resonance cavity, exocoel feedback fraction, described exocoel feedback fraction comprises acousto-optic modulator AOM, it is characterized in that, described AOM adopts this diffraction of Raman-how, in the diffraction light that is produced, zero order light output, the arbitrary level in the senior light feeds back in the described main resonance cavity.
2, Picopulse optical fiber laser according to claim 1 is characterized in that, the laser of described main resonance cavity output impinges perpendicularly on the plane of crystal of described AOM behind the collimating lens collimation.
3, Picopulse optical fiber laser according to claim 1 is characterized in that, described main resonance cavity comprises dichroscope, yb-doped double-clad fiber; Described exocoel feedback fraction comprises balzed grating,, and described balzed grating, is used to feed back and export the diffraction light that described AOM produces.
4, Picopulse optical fiber laser according to claim 3 is characterized in that, the chamber of described main resonance cavity long for the long positive integer in the chamber of described exocoel feedback fraction doubly;
The long distance that arrives described yb-doped double-clad fiber tail end vertical cut end face for described dichroscope in the chamber of described main resonance cavity; The chamber length of described exocoel feedback fraction refers to the distance of the tail end vertical cut end face of described yb-doped double-clad fiber to described balzed grating.
5, Picopulse optical fiber laser according to claim 3 is characterized in that, described balzed grating, is reflective balzed grating,, by regulating described reflective balzed grating,, realizes the tuning of output laser and pressure narrow linewidth.
6, Picopulse optical fiber laser according to claim 5 is characterized in that, described reflective balzed grating, is provided with the whirligig of arrangement for adjusting height and horizontal direction.
7, Picopulse optical fiber laser according to claim 3 is characterized in that, the chamber length of frequency displacement feedback cavity and the product of the frequency displacement in the chamber equal π, and the chamber length of described frequency displacement feedback cavity refers to the distance of described dichroscope to described balzed grating.
8, Picopulse optical fiber laser according to claim 1 is characterized in that, described senior light comprises the arbitrary level in 2 grades of light to 5 grade light.
9, Picopulse optical fiber laser according to claim 1 is characterized in that, the modulating frequency of described AOM is more than or equal to 40MHz.
10, Picopulse optical fiber laser according to claim 3 is characterized in that, described yb-doped double-clad fiber is single transverse mode optical fiber.
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| CN200810222105A CN100588053C (en) | 2008-09-09 | 2008-09-09 | Picosecond impulse optical fiber laser |
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| CN200810222105A CN100588053C (en) | 2008-09-09 | 2008-09-09 | Picosecond impulse optical fiber laser |
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| CN101414726A true CN101414726A (en) | 2009-04-22 |
| CN100588053C CN100588053C (en) | 2010-02-03 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151705A (en) * | 2013-02-16 | 2013-06-12 | 哈尔滨工业大学 | Littman external cavity laser capable of combining liquid crystal spatial light modulator and acoustic-optical modulator, and tuning method of Littman external cavity laser |
| CN103245292A (en) * | 2013-05-09 | 2013-08-14 | 哈尔滨工业大学 | Super-resolution acousto-optic modulation confocal imaging device and method |
| CN106654850A (en) * | 2015-07-14 | 2017-05-10 | 中国科学院大连化学物理研究所 | Deep UV-visible region wavelength continuously adjustable nanosecond and picosecond pulsed laser |
| CN106921107A (en) * | 2015-12-28 | 2017-07-04 | 恩耐公司 | The individual pulse of the fully controllable burst shaping from psec optical fiber laser |
| US10315274B2 (en) | 2011-09-20 | 2019-06-11 | Nlight, Inc. | Laser marking method and system and laser marked object |
| CN110112652A (en) * | 2019-05-16 | 2019-08-09 | 中国科学院半导体研究所 | Extenal cavity tunable laser device and wavelength tuning method |
-
2008
- 2008-09-09 CN CN200810222105A patent/CN100588053C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10315274B2 (en) | 2011-09-20 | 2019-06-11 | Nlight, Inc. | Laser marking method and system and laser marked object |
| CN103151705A (en) * | 2013-02-16 | 2013-06-12 | 哈尔滨工业大学 | Littman external cavity laser capable of combining liquid crystal spatial light modulator and acoustic-optical modulator, and tuning method of Littman external cavity laser |
| CN103245292A (en) * | 2013-05-09 | 2013-08-14 | 哈尔滨工业大学 | Super-resolution acousto-optic modulation confocal imaging device and method |
| CN103245292B (en) * | 2013-05-09 | 2015-07-22 | 哈尔滨工业大学 | Super-resolution acousto-optic modulation confocal imaging device and method |
| CN106654850A (en) * | 2015-07-14 | 2017-05-10 | 中国科学院大连化学物理研究所 | Deep UV-visible region wavelength continuously adjustable nanosecond and picosecond pulsed laser |
| CN106921107A (en) * | 2015-12-28 | 2017-07-04 | 恩耐公司 | The individual pulse of the fully controllable burst shaping from psec optical fiber laser |
| CN110112652A (en) * | 2019-05-16 | 2019-08-09 | 中国科学院半导体研究所 | Extenal cavity tunable laser device and wavelength tuning method |
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| Publication number | Publication date |
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| CN100588053C (en) | 2010-02-03 |
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