CN2901642Y - Short pulse ytterbinm doped double coating layer optical fiber laser - Google Patents
Short pulse ytterbinm doped double coating layer optical fiber laser Download PDFInfo
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- CN2901642Y CN2901642Y CN 200520123471 CN200520123471U CN2901642Y CN 2901642 Y CN2901642 Y CN 2901642Y CN 200520123471 CN200520123471 CN 200520123471 CN 200520123471 U CN200520123471 U CN 200520123471U CN 2901642 Y CN2901642 Y CN 2901642Y
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Abstract
The utility model relates to a short-pulse yttrium blending double cladding optical fiber laser, which is characterized in that the utility model comprises a main resonant cavity and an external cavity feedback. The main resonant cavity is sequentially composed of a semiconductor laser, a coupler, a dichroic filter, an yttrium blending double cladding optical fiber, wherein the semiconductor laser is the pumping source, while the resonant cavity is composed of the dichroic filter and the yttrium blending double cladding optical fiber. The pumping light enters into the resonant cavity through the coupler. The external cavity feedback comprises a coupling output lens, an acoustic-optic modulator, and a diffraction grating. The laser generated by the main resonant cavity is coupled through a collimation lens and enters into the diffraction grating through the acoustic-optic modulator, and the part of the reflected signal light entering into the main resonant cavity is coupled through the acoustic-optic modulator and the collimation lens and enters into the main resonant cavity. The signal light passes the acoustic-optic modulator and diffracts at the diffraction grating, and the zero-level diffracted light is returned to the main resonant cavity. The first-order diffracted light is generated. The utility model is simple in structure and high in quality-cost ratio, and can realize broad tuning, narrow line wide, and a steady output of millisecond laser pulse, which can be widely used.
Description
Technical field
The utility model 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 utility model 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.
The utility model content
The purpose of this utility model is to overcome above-mentioned weak point, provides 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 scheme that the utility model adopted 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 beneficial effects of the utility model are: 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 the utility model structure 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, details are as follows to embodiment, structure, feature that foundation the utility model provides:
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, stable passive Q regulation pulse ytterbium-doped double-cladded-layer optical fiber laser that the utility model is related to have carried out specific description, and 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 utility model 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 the protection range of the present utility model in the variation and the modification that do not break away under the utility model general plotting.
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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| Application Number | Priority Date | Filing Date | Title |
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| CN 200520123471 CN2901642Y (en) | 2005-11-29 | 2005-11-29 | Short pulse ytterbinm doped double coating layer optical fiber laser |
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| CN 200520123471 CN2901642Y (en) | 2005-11-29 | 2005-11-29 | Short pulse ytterbinm doped double coating layer optical fiber laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100492148C (en) * | 2007-12-13 | 2009-05-27 | 中国科学院上海光学精密机械研究所 | All-fiber narrow-linewidth hundred-nanosecond pulse signal system |
| CN101582561B (en) * | 2008-05-12 | 2012-07-04 | 中国计量科学研究院 | Grating diffraction external cavity semiconductor laser |
-
2005
- 2005-11-29 CN CN 200520123471 patent/CN2901642Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100492148C (en) * | 2007-12-13 | 2009-05-27 | 中国科学院上海光学精密机械研究所 | All-fiber narrow-linewidth hundred-nanosecond pulse signal system |
| CN101582561B (en) * | 2008-05-12 | 2012-07-04 | 中国计量科学研究院 | Grating diffraction external cavity semiconductor laser |
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