CN104242039A - Small-size frequency doubling green light optical fiber laser - Google Patents
Small-size frequency doubling green light optical fiber laser Download PDFInfo
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- CN104242039A CN104242039A CN201410491764.5A CN201410491764A CN104242039A CN 104242039 A CN104242039 A CN 104242039A CN 201410491764 A CN201410491764 A CN 201410491764A CN 104242039 A CN104242039 A CN 104242039A
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Abstract
The invention discloses a small-size frequency doubling green light optical fiber laser. The small-size frequency doubling green light optical fiber laser comprises a semiconductor saturable absorber mirror (SESAM), a pump light stripper, a double-cladding ytterbium-doped optical fiber, a pump combiner, a quasi-phase matching PPLN crystal, a broadband fiber bragg grating and an optical fiber collimator. The PPLN crystal is a waveguide device packaged by a temperature controller. According to the optical fiber laser of a full-waveguide structure, efficient lasers with the bandwidth central wavelength of 532 nm can be obtained based on the intracavity frequency doubling technology. The optical fiber laser is miniaturized, compact in structure, high in stability, high in frequency doubling efficiency and suitable for being applied to the application fields of laser projection machines and the like.
Description
Technical field
The present invention relates to field of lasers, specifically a kind of small frequency multiplication green-light fiber laser.
Background technology
The small-sized green (light) laser of efficient high light beam quality is in industrial processes, laser display, medical treatment, there is a large amount of demands in many fields such as subsurface communication, general green laser is realized by the frequency multiplication neodymium-doped solid state laser in chamber or outside chamber, most solid laser contains Space Coupling device, thus there is the shortcomings such as interference free performance difference, and block neodymium-doped gain media (Nd:YAG, Nd:YVO4) at the gain bandwidth of 1 mu m waveband all very narrow (<1nm), cause exporting green glow double-frequency laser live width at below 1nm, the laser speckle that high coherence produces in the illumination system is very serious, particularly in laser display, laser speckle is experienced having a strong impact on user the high-quality of laser display.It is high that fiber laser has transformation efficiency, good beam quality, and heat management is convenient, and the advantages such as compact conformation, can obtain high power, the laser of high light beam quality.
Quasi-phase matched PPLN, can utilize the non linear coefficient of crystal to greatest extent, have the feature of high efficiency and broad band.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, providing a kind of small frequency multiplication green-light fiber laser of novel efficient high light beam quality, laser exports the Gao Zhongying pulse green laser for little broadband.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of small frequency multiplication green-light fiber laser, it is characterized in that: this laser is by semiconductor saturable absorbing mirror SESAM, pump light stripper, Double Cladding Ytterbium Doped Fiber, pump combiner, PPLN crystal, band optical fiber grating, optical fiber collimator forms, wherein the input of pump combiner multiple pump light source is gathered together formation one tunnel export, the output of pump combiner is connected with one end of Double Cladding Ytterbium Doped Fiber, by the pump light that pump combiner gathers, Double Cladding Ytterbium Doped Fiber is entered by the output of pump combiner, pumping is carried out to Double Cladding Ytterbium Doped Fiber, power conversion and the storage of pump light is realized by the population inversion of Double Cladding Ytterbium Doped Fiber Doped ions, the other end of Double Cladding Ytterbium Doped Fiber is connected with one end of pump light stripper, by the pump light filtering of pump light stripper by remnants, the pump light stripper other end is connected with semiconductor saturable absorbing mirror SESAM by optical fiber, the signal port of pump combiner input is connected by optical fiber one end with PPLN crystal, the PPLN crystal other end is connected with band optical fiber grating, whole system forms a mode-locked laser resonant cavity, band optical fiber grating as laser output cavity mirror and be connected with optical fiber collimator and export directional light,
Described pump combiner is (N+1) × 1 pump combiner, wherein N is pumping input port, accessible N number of semiconductor pump laser, (N+1) 1 is the signal input port at pump combiner input, and the operation wavelength of pump combiner need match with Double Cladding Ytterbium Doped Fiber pumping wavelength; Double Cladding Ytterbium Doped Fiber is the optical fiber that gain bandwidth drops on 1 mu m waveband; Mode locked fiber laser is with fundamental frequency work, wavelength is at 1 mu m waveband, basic frequency laser passes through PPLN crystal double frequency to green light band, wave-length coverage is 492nm-577nm, during band optical fiber grating locking fundamental frequency work, centre wavelength is at 1 mu m waveband, and after being collimated by optical fiber collimator by frequency multiplication, the centre wavelength of coupling output is at green light band; Residual pump light is coupled away by pump light stripper; Described semiconductor saturable absorbing mirror SESAM makes laser works in the mode-lock status of fundamental frequency 1 mu m waveband; Laser output spectrum is broadband green spectrum.
Described a kind of small frequency multiplication green-light fiber laser, is characterized in that: described PPLN crystal adopts temperature control encapsulation, and attemperating unit can adopt the semiconductor chilling plate of FEEDBACK CONTROL or hot stove, makes PPLN be operated in best operating point.
Described a kind of small frequency multiplication green-light fiber laser, it is characterized in that: described band optical fiber grating is uniform period fiber grating or a chirped fiber grating with broadband reflection spectrum, band optical fiber grating pair 1 mu m waveband basic frequency laser is high anti-, to frequency doubling green light full impregnated, band optical fiber grating both as the output cavity mirror of laser, again as filter.
Described a kind of small frequency multiplication green-light fiber laser, is characterized in that: described semiconductor saturable absorbing mirror SESAM is as the speculum of a laserresonator.
Described a kind of small frequency multiplication green-light fiber laser, is characterized in that: described fiber laser is operated in 1 mu m waveband fundamental frequency mode-lock status, exports green light band frequency multiplication broad band laser through PPLN frequency multiplication.
Described small frequency multiplication green-light fiber laser, it is characterized in that, laser is intracavity frequency doubling, fundamental frequency is 1 mu m waveband, and frequency multiplication is exported at green light band.
Advantage of the present invention is:
Combine Double Cladding Ytterbium Doped Fiber wide spectral feature and mode-locked laser characteristic (high-peak power and broadband), make output basic frequency laser have little broadband and efficient feature..
Accompanying drawing explanation
Fig. 1 is light channel structure figure of the present invention.
Fig. 2 is the spectrum schematic diagram of middle width strip fiber grating reflectance spectrum of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is further illustrated, but should not limit the scope of the invention.
A kind of small frequency multiplication green-light fiber laser, it is characterized in that this laser is by semiconductor saturable absorbing mirror SESAM1, pump light stripper 2, Double Cladding Ytterbium Doped Fiber 3, pump combiner 4, PPLN crystal 5, band optical fiber grating 6, optical fiber collimator 7 forms, wherein the input of pump combiner 4 multiple pump light source is gathered together formation one tunnel export, the output of pump combiner 4 is connected with one end of Double Cladding Ytterbium Doped Fiber 3, by the pump light that pump combiner 4 gathers, Double Cladding Ytterbium Doped Fiber 3 is entered by the output of pump combiner 4, pumping is carried out to Double Cladding Ytterbium Doped Fiber 3, power conversion and the storage of pump light is realized by the population inversion of Double Cladding Ytterbium Doped Fiber 3 Doped ions, the other end of Double Cladding Ytterbium Doped Fiber 3 is connected with one end of pump light stripper 2, by the pump light filtering of pump light stripper 2 by remnants, pump light stripper 2 other end is connected with semiconductor saturable absorbing mirror SESAM1 by optical fiber.In addition, the signal port of pump combiner 4 input is connected by optical fiber one end with PPLN crystal 5, PPLN crystal 5 other end is connected with band optical fiber grating 6, whole system forms a mode-locked laser resonant cavity, band optical fiber grating 6 as laser output cavity mirror and be connected with optical fiber collimator 7 and export directional light;
Pump combiner 4 is (N+1) × 1 pump combiner, wherein N is pumping input port, accessible N number of semiconductor pump laser, (N+1) 1 is the signal input port at pump combiner 4 input, and the operation wavelength of pump combiner 4 need match with Double Cladding Ytterbium Doped Fiber pumping wavelength; Double Cladding Ytterbium Doped Fiber 3 drops on the optical fiber of 1 mu m waveband for gain bandwidth; Mode locked fiber laser is with fundamental frequency work, wavelength is at 1 mu m waveband, basic frequency laser passes through PPLN crystal 5 frequency multiplication to green light band, wave-length coverage is 492nm-577nm, band optical fiber grating 6 locks centre wavelength when fundamental frequency works and, at 1 mu m waveband, collimates the centre wavelength of rear coupling output at green light band by frequency multiplication by optical fiber collimator 7; Residual pump light is coupled away by pump light stripper 2; Semiconductor saturable absorbing mirror SESAM1 makes laser works in the mode-lock status of fundamental frequency 1 mu m waveband; Laser output spectrum is broadband green spectrum.
PPLN crystal 5 adopts temperature control to encapsulate, and attemperating unit can adopt the semiconductor chilling plate of FEEDBACK CONTROL or hot stove, makes PPLN be operated in best operating point.
Band optical fiber grating 6 is uniform period fiber grating or a chirped fiber grating with broadband reflection spectrum, band optical fiber grating 6 is high anti-to 1 mu m waveband basic frequency laser, to frequency doubling green light full impregnated, band optical fiber grating 6 both as the output cavity mirror of laser, again as filter.
Semiconductor saturable absorbing mirror SESAM1 is as the speculum of a laserresonator.
Fiber laser is operated in 1 mu m waveband fundamental frequency mode-lock status, exports green light band frequency multiplication broad band laser through PPLN frequency multiplication.
Laser is intracavity frequency doubling, and fundamental frequency is 1 mu m waveband, and frequency multiplication is exported at green light band.
Fig. 1 is the structural representation of green-light fiber laser of the present invention, and it comprises as seen from the figure, semiconductor saturable absorbing mirror SESAM1, pumping stripper 2, Double Cladding Ytterbium Doped Fiber 3, pump combiner 4, the PPLN crystal 5 of periodic polarized quasi-phase matched, band optical fiber grating 6, optical fiber collimator 7.
Described laser is the full-optical-fiber laser of the intracavity frequency doubling of a straight cavity configuration, chamber mirror has SESAM1 and fiber grating 6 to form, SESAM1 provides nonlinear reflectivity to realize locked mode, fiber grating provides the centre wavelength during fundamental frequency work selecting wavelength reflection locked laser, and gain media is Double Cladding Ytterbium Doped Fiber.
Pumping has semiconductor laser by pump combiner 4 coupled into double-clad fiber 3, pumping Yb dosed optical fiber 3, and residual pump light is coupled out outside chamber by pumping stripper 2, and preventing entering SESAM1 affects mode-lock status.Be 532nm by PPLN6 frequency multiplication after fundamental frequency 1064nm starting of oscillation, by optical fiber collimator 7 coupling output.
The physical parameter enumerating a specific embodiment is as follows:
As shown in Figure 1, described SESAM1 is the SESAM of batop, described Double Cladding Ytterbium Doped Fiber 3 is the Double Cladding Ytterbium Doped Fiber of 10/130 of nlight, periodic polarized quasi-phase-matching crystals PPLN6 adopts planar waveguide structure 5%MgO:PPLN temperature control packaged fiber device, and fiber grating reflectance spectrum as shown in Figure 2.PPLN6 device tail optical fiber is connected with output collimator 7.PPLN passes through temperature control feedback circuit steady operation at 25 degrees Celsius.
Claims (6)
1. a small frequency multiplication green-light fiber laser, it is characterized in that: this laser is by semiconductor saturable absorbing mirror SESAM, pump light stripper, Double Cladding Ytterbium Doped Fiber, pump combiner, PPLN crystal, band optical fiber grating, optical fiber collimator forms, wherein the input of pump combiner multiple pump light source is gathered together formation one tunnel export, the output of pump combiner is connected with one end of Double Cladding Ytterbium Doped Fiber, by the pump light that pump combiner gathers, Double Cladding Ytterbium Doped Fiber is entered by the output of pump combiner, pumping is carried out to Double Cladding Ytterbium Doped Fiber, power conversion and the storage of pump light is realized by the population inversion of Double Cladding Ytterbium Doped Fiber Doped ions, the other end of Double Cladding Ytterbium Doped Fiber is connected with one end of pump light stripper, by the pump light filtering of pump light stripper by remnants, the pump light stripper other end is connected with semiconductor saturable absorbing mirror SESAM by optical fiber, the signal port of pump combiner input is connected by optical fiber one end with PPLN crystal, the PPLN crystal other end is connected with band optical fiber grating, whole system forms a mode-locked laser resonant cavity, band optical fiber grating as laser output cavity mirror and be connected with optical fiber collimator and export directional light,
Described pump combiner is (N+1) × 1 pump combiner, wherein N is pumping input port, accessible N number of semiconductor pump laser, (N+1) 1 is the signal input port at pump combiner input, and the operation wavelength of pump combiner need match with Double Cladding Ytterbium Doped Fiber pumping wavelength; Double Cladding Ytterbium Doped Fiber is the optical fiber that gain bandwidth drops on 1 mu m waveband; Mode locked fiber laser is with fundamental frequency work, wavelength is at 1 mu m waveband, basic frequency laser passes through PPLN crystal double frequency to green light band, wave-length coverage is 492nm-577nm, during band optical fiber grating locking fundamental frequency work, centre wavelength is at 1 mu m waveband, and after being collimated by optical fiber collimator by frequency multiplication, the centre wavelength of coupling output is at green light band; Residual pump light is coupled away by pump light stripper; Described semiconductor saturable absorbing mirror SESAM makes laser works in the mode-lock status of fundamental frequency 1 mu m waveband; Laser output spectrum is broadband green spectrum.
2. a kind of small frequency multiplication green-light fiber laser according to claim 1, is characterized in that: described PPLN crystal adopts temperature control encapsulation, and attemperating unit can adopt the semiconductor chilling plate of FEEDBACK CONTROL or hot stove, makes PPLN be operated in best operating point.
3. a kind of small frequency multiplication green-light fiber laser according to claim 1, it is characterized in that: described band optical fiber grating is uniform period fiber grating or a chirped fiber grating with broadband reflection spectrum, band optical fiber grating pair 1 mu m waveband basic frequency laser is high anti-, to frequency doubling green light full impregnated, band optical fiber grating both as the output cavity mirror of laser, again as filter.
4. a kind of small frequency multiplication green-light fiber laser according to claim 1, is characterized in that: described semiconductor saturable absorbing mirror SESAM is as the speculum of a laserresonator.
5. a kind of small frequency multiplication green-light fiber laser according to claim 1, is characterized in that: described fiber laser is operated in 1 mu m waveband fundamental frequency mode-lock status, exports green light band frequency multiplication broad band laser through PPLN frequency multiplication.
6. small frequency multiplication green-light fiber laser according to claim 1, is characterized in that, laser is intracavity frequency doubling, and fundamental frequency is 1 mu m waveband, and frequency multiplication is exported at green light band.
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| CN105356216A (en) * | 2015-11-16 | 2016-02-24 | 华南理工大学 | All-fiber narrow-linewidth single frequency green laser |
| CN106229804A (en) * | 2016-09-12 | 2016-12-14 | 杨海林 | A kind of large-power optical fiber base pure-tone pulse laser instrument |
| CN107370015A (en) * | 2017-08-15 | 2017-11-21 | 中国科学技术大学 | A kind of multi-wavelength frequency multiplication fiber laser device of wavelength-division multiplex |
| CN109473863A (en) * | 2019-01-10 | 2019-03-15 | 合肥全色光显科技有限公司 | A kind of multiple bases laser display apparatus based on wavelength-tuned laser |
| CN109861072A (en) * | 2019-03-21 | 2019-06-07 | 中国科学技术大学 | The device of green laser is generated based on periodical lithium niobate frequency doubler crystal (PPLN) |
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| CN109473863A (en) * | 2019-01-10 | 2019-03-15 | 合肥全色光显科技有限公司 | A kind of multiple bases laser display apparatus based on wavelength-tuned laser |
| CN109861072A (en) * | 2019-03-21 | 2019-06-07 | 中国科学技术大学 | The device of green laser is generated based on periodical lithium niobate frequency doubler crystal (PPLN) |
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Application publication date: 20141224 |