CN1776974A - Short-pulse ytterbium-doped double-cladded-layer optical fiber laser - Google Patents
Short-pulse ytterbium-doped double-cladded-layer optical fiber laser Download PDFInfo
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- CN1776974A CN1776974A CN 200510016484 CN200510016484A CN1776974A CN 1776974 A CN1776974 A CN 1776974A CN 200510016484 CN200510016484 CN 200510016484 CN 200510016484 A CN200510016484 A CN 200510016484A CN 1776974 A CN1776974 A CN 1776974A
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Abstract
The laser includes two parts of main resonant cavity and outer cavity feedback. The main cavity is composed of semiconductor laser, coupler, dichroic mirror, doubly coated fiber with ytterbium being doped. Semiconductor laser is pump source. Dichroic mirror and the fiber constitute laser resonant cavity. Through coupler, pump light enters into the resonant cavity. The outer cavity feedback is composed of coupled output lens, acousto-optic modulator and diffraction grating. Through coupling of collimating lens, and modulator, laser output from the main cavity is incident to the grating. Passing through the modulator and lens again, the reflected part of signal light enters into the main cavity. After signal light passes through the modulator, diffraction occurs at the diffraction grating. Light in zeroth diffraction order is fed back to main cavity, and light in first order is output. Features are: broad tuning, narrow linewidth and stable laser pulse in Nano second level.
Description
Technical field
The present invention relates to a kind of laser, the short-pulse ytterbium-doped double-cladded-layer optical fiber laser of particularly a kind of broad tuning, narrow linewidth, stable nanosecond order.
Background technology
Along with deepening continuously of laser technology field research, development has that threshold value is low, low noise, high s/n ratio, miniaturization and the short-pulse ytterbium-doped double-cladded-layer optical fiber laser that need not to freeze are one of this field difficult problems anxious to be captured, and it is containing huge using value and vast market prospect in fields such as laser processing, laser medicine, laser marking, seed light sources.At present, the research information of existing this invention is CN 200410073285.8 " super-short pulse laser with Yb dosed optical fiber " as application number, and this ultrashort pulse fiber laser pulse energy for laser processing is less, repetition rate is very high, can not satisfy the needs of laser processing; And because this system needs the dispersion compensation components and parts, therefore the optical element that needs is many, causes in the process of running noise bigger than normal, and signal to noise ratio is lower.This is inconvenient in practical applications such as laser processing, laser medicine, laser marking, seed light source.The researcher who has utilizes the stimulated Brillouin scattering in the optical fiber can realize the short pulse fiber laser, can be created in that width is the burst pulse of nanosecond order on the time domain, but repetition rate, pulse strength are all unstable, and amplitudes that both change very greatly.The researcher who also has utilizes initiatively device formation pulse Yb-doping double-clad optical fiber laser, adds acousto-optic modulator usually, though the repetition rate of laser pulse has been stablized, the intensity of laser pulse has shake largely.Also there is the researcher that above-mentioned two kinds of methods are combined, be used to produce the laser pulse of nanosecond order, but the threshold value of this laser is very high, and the laser pulse that produces is still shaken aspect pulse strength, though the frequency characteristic of pulse is comparatively stable, the stability of pulse strength and pulse duration does not still have greatly improved.
Summary of the invention
The objective of the invention is to overcome above-mentioned weak point, provide that a kind of threshold value is low, low noise, high s/n ratio, miniaturization and need not refrigeration, the short-pulse ytterbium-doped double-cladded-layer optical fiber laser of simple in structure, dependable performance.
The technical solution adopted in the present invention is for achieving the above object: a kind of short-pulse ytterbium-doped double-cladded-layer optical fiber laser, and its feature is made of main resonance cavity part (a) and exocoel feedback fraction (b) two parts; Main resonance cavity (a) is made of semiconductor laser (1), coupler (2), dichroscope (3), yb-doped double-clad fiber (4) successively; Semiconductor laser (1) is a pumping source; Dichroscope (3) and yb-doped double-clad fiber (4) constitute laserresonator; Pump light enters in the resonant cavity through coupler (2); Exocoel feedback fraction (b) is made of coupling output lens (5), acousto-optic modulator (6), diffraction grating (7); The laser of main resonance cavity (a) output is coupled by collimating lens, incides diffraction grating by acousto-optic modulator (6), and the part signal light that reflects is coupled into main resonance cavity (a) by acousto-optic modulator (6), collimating lens once more; Diffraction takes place by acousto-optic modulator (6) back in flashlight at the diffraction grating place, zero order diffracted light is fed back to main resonance cavity (a), the output of first-order diffraction light.
The wave-length coverage of described semiconductor laser is 900nm-1000nm.
The resonant cavity of described laser is made of main resonance cavity and reflective diffraction gratings exocoel; By diffraction grating is fed back to main resonance cavity to the zero order diffracted light of flashlight.
Described reflective diffraction gratings exocoel adopts Littrow exocoel or Littmann exocoel.
The long 10-50m of yb-doped double-clad fiber in the described main resonance cavity, fiber core radius 4-15 μ m.
Diffraction grating in the described exocoel is a reflective diffraction gratings, and grating parameter is 1200l/mm.
Described reflective diffraction gratings is fixed on the rotating platform, realizes the tuning output of optical maser wavelength by the angle of adjusting rotating platform.
The parameter area of the acousto-optic modulator in the described reflective diffraction gratings exocoel is as follows: radio frequency signal frequency: 27MHz-100MHz, pulse repetition frequency: 1Hz-50kHz, pulse duration: 5-7 μ s.
When described reflective diffraction gratings exocoel is the Littmann exocoel, can select total reflective mirror or reflective diffraction gratings for use, the centre wavelength of shoot laser pulse is in the bandwidth range of total reflective mirror, and reflectivity is greater than 99%.
When described reflective diffraction gratings exocoel is the Littmann exocoel, can select two reflective diffraction gratings for use, the grating parameter of corresponding reflective diffraction gratings is 1200l/mm.
The invention has the beneficial effects as follows: its technology is simple, the cost performance height, structure by improving exocoel also can be selected the different laser way of outputs, utilizes its simple structure and less optical element, realizes the output of broad tuning, narrow linewidth, stable nanosecond order laser pulse.Can be widely used in fields such as laser processing, laser medicine, laser marking, seed light source.
Description of drawings
Fig. 1 is that structure of the present invention is formed schematic diagram,
A is the main resonance cavity part, and b is the exocoel feedback fraction;
Fig. 2 is the Littmann exocoel;
The time domain specification curve chart of this fiber laser when Fig. 3 a is the output nanosecond pulse;
The time domain specification curve pulse expanded view of this fiber laser when Fig. 3 b is the output nanosecond pulse;
Fig. 4 is acousto-optic modulator laser output laser power characteristics curve chart when closing;
Fig. 5 is the spectrogram of acousto-optic modulator laser output laser when closing;
The spectrum of laser output was the peak power output curve chart when Fig. 6 a was acousto-optic modulator work;
The spectrum of laser output was minimum tuning wavelength curve chart when Fig. 6 b was acousto-optic modulator work;
The spectrum of laser output was maximum tuning wavelength curve chart when Fig. 6 c was acousto-optic modulator work;
Among the figure: ordinate is gone into the power of spectrometer for decay is laggard; Abscissa is a wavelength, and unit is μ m, the resolution of instrument when PES represents to measure, and Wp is the wavelength at peak power place.
Fig. 7 is a graph of relation between laser pulse power output and the pulse center wavelength.
Implement concrete mode
Below in conjunction with accompanying drawing and preferred embodiment, to according to embodiment provided by the invention, structure, details are as follows for feature:
Referring to Fig. 1～Fig. 7, a kind of short-pulse ytterbium-doped double-cladded-layer optical fiber laser, its feature is made of main resonance cavity part a and exocoel feedback fraction b two parts; Main resonance cavity a is made of semiconductor laser 1, coupler 2, dichroscope 3, yb-doped double-clad fiber 4 successively; Semiconductor laser 1 is a pumping source; Dichroscope 3 and yb-doped double-clad fiber 4 constitute laserresonator; Pump light enters in the resonant cavity through coupler 2; Exocoel feedback fraction b is made of coupling output lens 5, acousto-optic modulator 6, diffraction grating 7; The laser of main resonance cavity a output is coupled by collimating lens, incides diffraction grating by acousto-optic modulator 6, and the part signal light that reflects is coupled into main resonance cavity a by acousto-optic modulator 6, collimating lens once more; Diffraction takes place by acousto-optic modulator 6 backs in flashlight at the diffraction grating place, zero order diffracted light is fed back to main resonance cavity a, the output of first-order diffraction light.
Referring to Fig. 1, broad tuning, narrow linewidth, the stable passive Q regulation pulse ytterbium-doped double-cladded-layer optical fiber laser that the present invention relates to carried out specific description, it is made of two parts: main resonance cavity a, exocoel feedback fraction b constitute.
Main resonance cavity a is made of semiconductor laser 1, coupled system 2, dichroscope 3 and yb-doped double-clad fiber 4 successively.Semiconductor laser is a pumping source, swashs and hits the long 975nm of being of cardiac wave, live width 3nm.A chamber mirror of resonant cavity is a dichroscope 3, another chamber mirror is a yb-doped double-clad fiber vertical cut end face, the feedback that the Fresnel reflection of vertical cut end face provides can make the laser starting of oscillation, and dichroscope 3 and double clad Yb dosed optical fiber itself have just constituted main resonance cavity a like this.Pump light enters in the resonant cavity through coupled system.The Yb dosed optical fiber length of main resonance cavity is 20m, and doping content is 0.65mol%, fiber core radius 5.3 μ m, and the absorption coefficient at 975nm place is 5dB/m, the relating to parameters of dichroscope 3 parameters and pumping source.For example, selecting the reflectivity for the 975nm place in the experiment for use is 97%, and the reflectivity at the 1064nm place is 0.2%.
Exocoel feedback fraction b is made of collimating lens 5, acousto-optic modulator 6 and reflective diffraction gratings 7, and the laser of main resonance cavity a output becomes directional light through after the collimated, incides on the diffraction grating 7 through acousto-optic modulator 6.7 pairs of corresponding excitation wavelengths of diffraction grating produce reflective diffraction, and the horizontal rotatio direction of regulating grating makes zero order diffracted light feed back among the main resonance cavity a through collimating lens, the output of one-level light.The centre wavelength of reflective diffraction gratings 7 is 1064nm, 1200l/mm, and one-level diffraction of light efficient is 53%.In this device, on the workbench of the rotation that reflective diffraction gratings 7 is fixed on highly and can regulates, horizontal direction is passable.
The acousto-optic modulator of selecting for use 6 need not water-cooled, the frequency 80MHz of its radiofrequency signal, and pulse duration is 5-7 μ s.The parameter of total reflective mirror, reflection kernel wavelength 1064nm, reflectivity＞99%.
Utilizing respectively has the Littmann exocoel of total reflective mirror 8 to experimentize with the Littrow exocoel: the direction of the laser pulse of exporting when adopting the Littrow exocoel changes with the different of grating rotating direction.And have the Littmann exocoel of total reflective mirror in employing after, obtain the fixing laser pulse output of outbound course, and because the reflectivity of total reflective mirror is very high, so have or not total reflective mirror to the almost not influence of output spectrum, power.
Referring to Fig. 2, be the Littman exocoel, 8 is total reflective mirror or reflective diffraction gratings among the figure.
Referring to Fig. 3 a, Fig. 3 b, the time domain performance chart when turning round for short-pulse ytterbium-doped double-cladded-layer optical fiber laser.Fig. 3 a is a full figure, our about 500 μ s of pulse period of exporting as can be seen therefrom, and frequency is 2KHz, intensity amplitude jitter＜2% of output ns pulse; Fig. 3 b is an expanded view, can see only having a pulse in one-period, and pulse duration is less than 5ns.
Referring to Fig. 4, laser output laser power characteristics when closing for acousto-optic modulator.
Referring to Fig. 5, the spectrogram of laser output laser when closing for acousto-optic modulator.From output port outgoing wavelength is the laser of 1078.7nm; Spectroanalysis instrument is inserted in the decay back.Although acousto-optic modulator cuts out, exocoel still exists, and has pressed live width greatly narrow, and output laser linewidth only is 0.06nm.
The spectrogram of laser output when being the acousto-optic modulator unlatching referring to Fig. 6 a, Fig. 6 b, Fig. 6 c.Laser spectroscopy when Fig. 6 a illustrates peak power output and is 2W, the centre wavelength of output is 1082.46nm, spectral width is 0.06nm.Fig. 6 b illustrates minimum tuning wavelength, and this moment, output center wavelength was 1075.72nm, and spectral width is 0.06nm.Fig. 6 c illustrates maximum tuning wavelength, and this moment, output center wavelength was 1140.2nm, and spectral width is very narrow, is 0.06nm.
Referring to Fig. 7, be the relation between power output and the tuning wavelength.
Compare of analysis by above-mentioned empirical curve and parameter, the present invention of being made of pumping gain unit and two functional units of exocoel feedback unit has effectively guaranteed the output of broad tuning, narrow linewidth, stable nanosecond order laser pulse, for every field such as laser processing, laser medicine, laser marking, seed light source provide wide application prospect.
Above-mentioned with reference to embodiment to the detailed description that this short-pulse ytterbium-doped double-cladded-layer optical fiber laser carries out, be illustrative rather than determinate, therefore, should belong within protection scope of the present invention in the variation and the modification that do not break away under the general plotting of the present invention.
Claims (10)
1, a kind of short-pulse ytterbium-doped double-cladded-layer optical fiber laser, its feature is made of main resonance cavity part (a) and exocoel feedback fraction (b) two parts; Main resonance cavity (a) is made of semiconductor laser (1), coupler (2), dichroscope (3), yb-doped double-clad fiber (4) successively; Semiconductor laser (1) is a pumping source; Dichroscope (3) and yb-doped double-clad fiber (4) constitute laserresonator; Pump light enters in the resonant cavity through coupler (2); Exocoel feedback fraction (b) is made of coupling output lens (5), acousto-optic modulator (6), diffraction grating (7); The laser of main resonance cavity (a) output is coupled by collimating lens, incides diffraction grating by acousto-optic modulator (6), and the part signal light that reflects is coupled into main resonance cavity (a) by acousto-optic modulator (6), collimating lens once more; Diffraction takes place by acousto-optic modulator (6) back in flashlight at the diffraction grating place, zero order diffracted light is fed back to main resonance cavity (a), the output of first-order diffraction light.
2, short-pulse ytterbium-doped double-cladded-layer optical fiber laser according to claim 1, the wave-length coverage that it is characterized in that described semiconductor laser is 900nm-1000nm.
3, short-pulse ytterbium-doped double-cladded-layer optical fiber laser according to claim 1 is characterized in that the resonant cavity of described laser is made of main resonance cavity and reflective diffraction gratings exocoel; By diffraction grating is fed back to main resonance cavity to the zero order diffracted light of flashlight.
4,, it is characterized in that described reflective diffraction gratings exocoel adopts Littrow exocoel or Littmann exocoel according to claim 1 or 3 described short-pulse ytterbium-doped double-cladded-layer optical fiber lasers.
5,, it is characterized in that the long 10-50m of yb-doped double-clad fiber in the described main resonance cavity, fiber core radius 4-15 μ m according to claim 1 or 3 described short-pulse ytterbium-doped double-cladded-layer optical fiber lasers.
6, according to claim 1 or 3 described short-pulse ytterbium-doped double-cladded-layer optical fiber lasers, it is characterized in that the diffraction grating in the described exocoel is a reflective diffraction gratings, grating parameter is 1200l/mm.
7, according to claim 1 or 3 described short-pulse ytterbium-doped double-cladded-layer optical fiber lasers, it is characterized in that described reflective diffraction gratings is fixed on the rotating platform, realize the tuning output of optical maser wavelength by the angle of adjusting rotating platform.
8, according to claim 1 or 3 described short-pulse ytterbium-doped double-cladded-layer optical fiber lasers, the parameter area that it is characterized in that the acousto-optic modulator in the described reflective diffraction gratings exocoel is as follows: radio frequency signal frequency: 27MHz-100MHz, pulse repetition frequency: 1Hz-50kHz, pulse duration: 5-7 μ s.
9, according to claim 1 or 4 described short-pulse ytterbium-doped double-cladded-layer optical fiber lasers, when it is characterized in that described reflective diffraction gratings exocoel is the Littmann exocoel, can select total reflective mirror or reflective diffraction gratings for use, the centre wavelength of shoot laser pulse is in the bandwidth range of total reflective mirror, and reflectivity is greater than 99%.
10, according to claim 1 or 4 described short-pulse ytterbium-doped double-cladded-layer optical fiber lasers, when it is characterized in that described reflective diffraction gratings exocoel is the Littmann exocoel, can select two reflective diffraction gratings for use, the grating parameter of corresponding reflective diffraction gratings is 1200l/mm.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100384035C (en) * | 2006-06-09 | 2008-04-23 | 中国科学院上海光学精密机械研究所 | Pulse width adjustable acousto-optic Q-switched double-cladding optical fiber laser |
| CN100405674C (en) * | 2006-07-14 | 2008-07-23 | 中国科学院上海光学精密机械研究所 | Tunable all-fiber narrow-band narrow-pulse laser |
| CN101859974A (en) * | 2010-06-12 | 2010-10-13 | 徐州师范大学 | Narrow linewidth thulium-doped fiber laser |
| 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 |
| CN104064948A (en) * | 2013-03-22 | 2014-09-24 | 中国科学院大连化学物理研究所 | Variable line selection stable resonant cavity suitable for air flow chemical laser |
| CN108493762A (en) * | 2018-01-26 | 2018-09-04 | 中国科学院上海光学精密机械研究所 | Semiconductor laser intensity noise restraining device based on nonlinear effect and suppressing method |
| CN111244746A (en) * | 2020-01-14 | 2020-06-05 | 中国科学院福建物质结构研究所 | Laser system |
| CN114605078A (en) * | 2022-03-02 | 2022-06-10 | 哈尔滨工程大学 | Based on Ho3+/Pr3+Co-doped ZBYA glass fiber and laser thereof |
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2005
- 2005-11-29 CN CN 200510016484 patent/CN1776974A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100384035C (en) * | 2006-06-09 | 2008-04-23 | 中国科学院上海光学精密机械研究所 | Pulse width adjustable acousto-optic Q-switched double-cladding optical fiber laser |
| CN100405674C (en) * | 2006-07-14 | 2008-07-23 | 中国科学院上海光学精密机械研究所 | Tunable all-fiber narrow-band narrow-pulse laser |
| CN101859974A (en) * | 2010-06-12 | 2010-10-13 | 徐州师范大学 | Narrow linewidth thulium-doped fiber laser |
| 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 |
| CN104064948A (en) * | 2013-03-22 | 2014-09-24 | 中国科学院大连化学物理研究所 | Variable line selection stable resonant cavity suitable for air flow chemical laser |
| CN108493762A (en) * | 2018-01-26 | 2018-09-04 | 中国科学院上海光学精密机械研究所 | Semiconductor laser intensity noise restraining device based on nonlinear effect and suppressing method |
| CN108493762B (en) * | 2018-01-26 | 2020-10-16 | 中国科学院上海光学精密机械研究所 | Semiconductor laser intensity noise suppression device and suppression method based on nonlinear effect |
| CN111244746A (en) * | 2020-01-14 | 2020-06-05 | 中国科学院福建物质结构研究所 | Laser system |
| CN114605078A (en) * | 2022-03-02 | 2022-06-10 | 哈尔滨工程大学 | Based on Ho3+/Pr3+Co-doped ZBYA glass fiber and laser thereof |
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