CN113937605A - Multi-parameter tunable femtosecond pulse laser - Google Patents
Multi-parameter tunable femtosecond pulse laser Download PDFInfo
- Publication number
- CN113937605A CN113937605A CN202111557709.8A CN202111557709A CN113937605A CN 113937605 A CN113937605 A CN 113937605A CN 202111557709 A CN202111557709 A CN 202111557709A CN 113937605 A CN113937605 A CN 113937605A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- laser
- femtosecond pulse
- pulse laser
- division multiplexer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/1065—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using liquid crystals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Lasers (AREA)
Abstract
The invention discloses a multi-parameter tunable femtosecond pulse laser, and relates to the field of femtosecond pulse lasers. The semiconductor saturable absorption mirror, the optical fiber coupler, the gain optical fiber, the wavelength division multiplexer and the optical fiber collimator which are connected sequentially are included, the grating pair, the bandwidth tunable filter and the reflecting mirror are sequentially arranged outside the output end of the optical fiber collimator, the optical fiber collimator and the grating pair, the bandwidth tunable filter and the center of the reflecting mirror are located on the same straight line, the input end of the wavelength division multiplexer is connected with a pumping source, and one output end of the optical fiber coupler is provided with an optical fiber jumper head. The femtosecond pulse laser disclosed by the invention can realize the tunability of the central wavelength and the spectral width of the laser by adjusting the bandwidth tunable filter under different dispersion domains while compressing the pulse width, and has the advantages of small volume, low cost and good stability.
Description
Technical Field
The invention relates to a femtosecond pulse laser, in particular to a multi-parameter tunable femtosecond pulse laser.
Background
The femtosecond laser has the advantages of high processing precision, small heat effect, low damage threshold value, capability of realizing real three-dimensional microstructure processing and the like. Compared with a femtosecond solid laser, the femtosecond fiber laser has the advantages of compact structure, convenience in integration, good heat dissipation performance, strong anti-interference capability and the like. In recent years, the femtosecond fiber laser technology has been rapidly developed, and has attracted attention in ultrafast laser technology and the entire laser field. On the other hand, with the development of high-speed large-capacity optical fiber communication systems, wavelength tunable optical fiber lasers have become hot research spots. The ultra-short pulse laser can generate ultra-short pulses at a plurality of central wavelengths, has lower cost and more convenient use compared with a laser which can only output a single wavelength, and is widely applied to the fields of industrial processing, biological medical treatment, multi-photon imaging, optical sensors and the like.
Ytterbium-doped femtosecond pulse fiber lasers (1 μm band) are particularly attractive due to their high gain, low quantum defects, and wide gain bandwidth. In order to generate 1 μm femtosecond pulse light, the net dispersion in the cavity needs to be a certain value. Compensating group velocity dispersion in a laser is an effective way to obtain femtosecond pulses. However, because of the large dispersion of common materials and the relatively weak waveguide dispersion, the conventional optical fiber, no matter ytterbium-doped fiber or common single-mode fiber, shows normal second-order dispersion (1 μm)β 2). Common devices that provide negative dispersion are known: solid/hollow photonic crystal fibers, high-order mode fibers, tapered fibers and the like, however, the solid/hollow photonic crystal fibers and the single mode fibers have high technical difficulty and high loss due to fusion splicing, and are expensive and few in product; high order mode optical fiber requires an additionalLengthening the periodic Bragg grating to perform mode conversion between a fundamental mode and a higher-order mode; since the light beam is focused on a small cross section, the optical power threshold of the tapered fiber is limited and the tapered fiber is easily melted down due to dust and the like attached to the surface. In addition, the above solutions only provide a fixed and non-tunable dispersion amount, and the technical implementation is also difficult, and high loss is easily introduced during welding.
In order to achieve wavelength tunability in each dispersion region, various research institutions or commercial companies have proposed various solutions, such as: the loss in the laser resonant cavity is changed by adjusting the temperature of the high-birefringence fiber by using the high-birefringence fiber ring mirror, so that the ultra-short pulse laser with tunable wavelength is output; the Martinus compressor is used for realizing dispersion compensation and adjustable spectrum filtering; the tapered optical fiber is used as a variable attenuator to adjust the loss in the cavity and realize continuous tunable wavelength, and a manual adjustable filter and an optical fiber grating are added in the laser cavity to realize continuous nanosecond pulse tuning and the like. The above methods have respective disadvantages:
1. high-birefringence fiber loop mirrors/fiber gratings and other fiber devices influence the loss in a laser cavity through temperature control to realize the adjustment of the central wavelength of laser, and a temperature control device is additionally arranged;
2. the Martinus compressor is of a pure space structure, and is large in number of devices, relatively low in stability and large in size;
3. manually tunable filters are typically bandwidth limited and fixed.
Therefore, most of the existing lasers can only adjust the center wavelength or the spectral width singly, and the problems that the tuning range of the laser wavelength is small or the provided tunable wavelength is relatively fixed corresponding to the spectral width exist; meanwhile, many lasers are high in cost and many in required devices, and instability of the lasers is increased.
Disclosure of Invention
In order to solve the technical problems, the invention provides a multi-parameter tunable femtosecond pulse laser, which achieves the purposes of flexibly adjusting intracavity dispersion, flexibly adjusting bandwidth and laser center wavelength, small volume, low cost and high stability.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides a many parameters tunable femto second pulse laser, includes semiconductor saturable absorption mirror, fiber coupler, gain fiber, wavelength division multiplexer and the fiber collimator that loops through fiber connection, fiber collimator output outside sets gradually grating pair, bandwidth tunable filter and speculum, fiber collimator and grating pair, bandwidth tunable filter and the center of speculum are located a straight line, the pumping source is connected to wavelength division multiplexer's input, fiber coupler's an output sets up the optic fibre jumper head.
In the above scheme, the input end of the optical fiber coupler is connected with one end of the gain optical fiber, and the other output end of the optical fiber coupler is connected with the semiconductor saturable absorber mirror.
In the above scheme, the output end of the wavelength division multiplexer is connected with the other end of the gain optical fiber, and the other end of the wavelength division multiplexer is connected with the optical fiber collimator.
Through the technical scheme, the multi-parameter tunable femtosecond pulse laser provided by the invention has the following beneficial effects:
1. the invention adopts the grating pair to carry out dispersion compensation on the space collimated light so as to achieve the purpose of outputting the femtosecond pulse laser, and the grating pair can flexibly adjust the dispersion amount according to the requirement, thereby changing different pulse widths, and has simple operation, low cost and high flexibility.
2. The invention adopts a bandwidth tunable filter to tune the bandwidth and the central wavelength of the laser, the bandwidth tunable filter takes liquid crystal as a working substance, and the bandwidth of the bandwidth tunable filter can be changed by applying transverse voltage; and applying a longitudinal voltage to the laser to tune the central wavelength of the laser. The adjusting mode has low cost and flexible adjusting freedom degree.
3. The invention realizes the tuning of the central wavelength and the spectral width of the laser by adjusting the bandwidth tunable filter under different dispersion domains while compressing the pulse width through the combination of the grating pair and the bandwidth tunable filter.
4. Most of the laser is an optical fiber device, and particularly, the semiconductor saturable absorber mirror, the optical fiber coupler, the gain optical fiber, the wavelength division multiplexer and the optical fiber collimator are connected through optical fibers, so that the laser is small in overall size, simple in structure and relatively high in stability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic structural diagram of a multi-parameter tunable femtosecond pulse laser according to an embodiment of the present invention;
FIG. 2 is a graph of center wavelength tuning of laser light output by an embodiment of the present invention;
FIG. 3 is a graph of spectral width adjustment of laser light output by an embodiment of the present invention;
FIG. 4 is a graph of different pulse width tuning of the laser output according to an embodiment of the present invention.
In the figure, 1, a semiconductor saturable absorption mirror; 2. a fiber coupler; 3. a gain fiber; 4. a wavelength division multiplexer; 5. a fiber collimator; 6. a grating pair; 7. a bandwidth tunable filter; 8. a mirror; 9. a pump source; 10. an optical fiber jumper head.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The invention provides a multi-parameter tunable femtosecond pulse laser, as shown in figure 1, which comprises a semiconductor saturable absorption mirror 1, an optical fiber coupler 2, a gain optical fiber 3, a wavelength division multiplexer 4 and an optical fiber collimator 5 which are sequentially connected through optical fibers, wherein a grating pair 6, a bandwidth tunable filter 7 and a reflector 8 are sequentially arranged outside the output end of the optical fiber collimator 5, and the centers of the optical fiber collimator 5, the grating pair 6, the bandwidth tunable filter 7 and the reflector 8 are positioned on the same straight line, so that a linear resonant cavity structure is formed between the whole laser from the semiconductor saturable absorption mirror 1 on the left side to the reflector 8 on the right side.
The semiconductor saturable absorption mirror 1 is not only used as a cavity mirror of a laser, but also is a key device for generating ultrashort pulses, and a tail fiber of the semiconductor saturable absorption mirror is connected with one output end of an optical fiber coupler 2 (1 multiplied by 2).
One end of the gain fiber 3 is connected with the input end of the fiber coupler 2 (1 × 2), and the other end is connected with the output end of the wavelength division multiplexer 4. The gain fiber 3 is an active fiber doped with rare-earth ions, and can absorb pump light and generate laser.
The input end of the wavelength division multiplexer 4 is connected with the pumping source 9 and is used for coupling pumping light provided by the pumping source 9 into the resonant cavity, exciting doped ions in the gain fiber 3 and pumping the ions from a ground state to a high energy level so as to realize the inversion of ion numbers to generate laser. The output end of the wavelength division multiplexer 4 is connected with one end of the gain optical fiber 3, and the other end of the wavelength division multiplexer 4 is connected with the optical fiber collimator 5.
The fiber collimator 5 makes the laser light of the fiber part enter the grating pair 6 in the form of spatially collimated light, and after reaching the bandwidth tunable filter 7 and the reflecting mirror 8, the laser light is coupled into the fiber collimator 5 through the grating pair 6 again.
The grating pair 6 carries out dispersion compensation on the space collimated light so as to achieve the purpose of outputting femtosecond pulse laser.
The input end of the optical fiber coupler 2 is connected with the other end of the gain optical fiber 3, and the other output end of the optical fiber coupler 2 is connected with the semiconductor saturable absorber mirror 1. An output end of the optical fiber coupler 2 is provided with an optical fiber jumper head 10 for leading out the femtosecond pulse laser through the optical fiber jumper head 10 according to a certain proportion.
The working principle of the femtosecond pulse laser is as follows:
the pump source 9 emits pump light, which is coupled into the gain fiber 3 by the wavelength division multiplexer 4, and the gain fiber 3 absorbs the pump light and generates laser. The semiconductor saturable absorption mirror 1 generates nonlinear saturable absorption effect on laser so as to realize passive mode locking and output pulse laser. Laser in the optical fiber is output as space collimated light through the optical fiber collimator 5, the space collimated light reaches the bandwidth tunable filter 7 and the reflector 8 after passing through the grating pair 6, then the space collimated light passes through the grating pair 6 again to compress pulse light, the compressed pulse light continuously oscillates back and forth in a resonant cavity formed between the semiconductor saturable absorber 1 and the reflector 8, and part of femtosecond pulse laser is output through an optical fiber jumper head 10 of the optical fiber coupler 2.
The optical fiber devices of the laser provide positive dispersion, the positive dispersion value of the optical fiber devices is calculated according to the length of the optical fiber, and flexible and adjustable negative dispersion can be provided for the laser by changing the distance between the grating pairs 6, so that the mode locking operation of the laser can be realized in a positive dispersion area, a near-zero dispersion area and a negative dispersion area.
The bandwidth tunable filter 7 uses liquid crystal as a working substance, and the bandwidth of the filter 7 can be changed by applying transverse voltage; and applying a longitudinal voltage to the laser to tune the central wavelength of the laser.
According to the laser provided by the embodiment of the invention, the central wavelength of the laser is tuned by applying the longitudinal voltage, and as shown in fig. 2, the maximum tuning range is 1015 nm-1045 nm. The bandwidth of the filter 7 can be changed by applying a transverse voltage, and as shown in fig. 3, the laser of the invention realizes the adjustment of the spectral width in the range of 20 nm by adjusting the grating pair 6 and the bandwidth of the bandwidth tunable filter 7. As shown in fig. 4, the laser of the present invention can adjust the pulse width from 54.55 fs to 433.94 fs by adjusting the spacing of the grating pair 6 to compensate for the different negative dispersion.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (3)
1. The multi-parameter tunable femtosecond pulse laser is characterized by comprising a semiconductor saturable absorption mirror, an optical fiber coupler, a gain optical fiber, a wavelength division multiplexer and an optical fiber collimator which are sequentially connected through an optical fiber, wherein a grating pair, a bandwidth tunable filter and a reflecting mirror are sequentially arranged outside the output end of the optical fiber collimator, the optical fiber collimator and the centers of the grating pair, the bandwidth tunable filter and the reflecting mirror are positioned on the same straight line, the input end of the wavelength division multiplexer is connected with a pumping source, and one output end of the optical fiber coupler is provided with an optical fiber jumper head.
2. The multi-parameter tunable femtosecond pulse laser as claimed in claim 1, wherein an input end of the optical fiber coupler is connected with one end of the gain fiber, and the other output end of the optical fiber coupler is connected with the semiconductor saturable absorber mirror.
3. A multi-parameter tunable femtosecond pulse laser as claimed in claim 2, wherein the output end of the wavelength division multiplexer is connected to the other end of the gain fiber, and the other end of the wavelength division multiplexer is connected to the fiber collimator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111557709.8A CN113937605A (en) | 2021-12-20 | 2021-12-20 | Multi-parameter tunable femtosecond pulse laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111557709.8A CN113937605A (en) | 2021-12-20 | 2021-12-20 | Multi-parameter tunable femtosecond pulse laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113937605A true CN113937605A (en) | 2022-01-14 |
Family
ID=79289285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111557709.8A Pending CN113937605A (en) | 2021-12-20 | 2021-12-20 | Multi-parameter tunable femtosecond pulse laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113937605A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115685448A (en) * | 2022-10-12 | 2023-02-03 | 北京大学长三角光电科学研究院 | Wavelength division multiplexer, design method and manufacturing method thereof and optical fiber laser |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101510663A (en) * | 2009-03-06 | 2009-08-19 | 苏州大学 | Polarization dual wavelength fiber-optical ultrashort pulse laser |
| US20100220751A1 (en) * | 2006-09-18 | 2010-09-02 | Chin Yu Chong | All-Normal-Dispersion Femtosecond Fiber Laser |
| CN102280809A (en) * | 2011-07-14 | 2011-12-14 | 余模智 | Outer cavity type electrooptically tuned laser device |
| CN103633547A (en) * | 2013-12-20 | 2014-03-12 | 武汉光迅科技股份有限公司 | Wavelength-tunable external cavity laser |
-
2021
- 2021-12-20 CN CN202111557709.8A patent/CN113937605A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100220751A1 (en) * | 2006-09-18 | 2010-09-02 | Chin Yu Chong | All-Normal-Dispersion Femtosecond Fiber Laser |
| CN101510663A (en) * | 2009-03-06 | 2009-08-19 | 苏州大学 | Polarization dual wavelength fiber-optical ultrashort pulse laser |
| CN102280809A (en) * | 2011-07-14 | 2011-12-14 | 余模智 | Outer cavity type electrooptically tuned laser device |
| CN103633547A (en) * | 2013-12-20 | 2014-03-12 | 武汉光迅科技股份有限公司 | Wavelength-tunable external cavity laser |
Non-Patent Citations (2)
| Title |
|---|
| 刘梦霖等: "1015nm-1046nm可调谐飞秒掺镱光纤激光器", 《红外与激光工程》 * |
| 钟建主编: "《液晶显示器件技术》", 28 February 2014 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115685448A (en) * | 2022-10-12 | 2023-02-03 | 北京大学长三角光电科学研究院 | Wavelength division multiplexer, design method and manufacturing method thereof and optical fiber laser |
| CN115685448B (en) * | 2022-10-12 | 2023-09-19 | 北京大学长三角光电科学研究院 | Wavelength division multiplexer, design method and manufacturing method thereof and fiber laser |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2006324613A (en) | Passive mode-locking short pulsed light fiber laser and scanning pulsed laser | |
| DE19802845A1 (en) | High power femto-second optical pulse generator | |
| EP1812823A2 (en) | Optical parametric amplification, optical parametric generation, and optical pumping in optical fibers systems | |
| CN107069410A (en) | A kind of multipurpose bidirectional passive mode-locking full optical fiber laser system | |
| US20110064096A1 (en) | Mid-IR laser employing Tm fiber laser and optical parametric oscillator | |
| CN109462139A (en) | Infrared Mode Locked Laser in 2.9 microns a kind of | |
| JP2019179918A (en) | Dual-comb generation from single laser cavity by spectral subdivision | |
| CN111509537B (en) | All-fiber ultrashort pulse mode-locked laser generation method and laser | |
| CN101820132A (en) | All solid-state medical double resonance intracavity sum frequency yellow light laser | |
| CN216773786U (en) | Broadband tunable intermediate infrared all-fiber ultrashort pulse laser | |
| CN113937605A (en) | Multi-parameter tunable femtosecond pulse laser | |
| CN105337148A (en) | All-fiber gas raman laser device used for generating two-micrometer lasers | |
| CN114421271A (en) | All-fiber neodymium-doped fiber laser | |
| US20090041062A1 (en) | Fiber-based tunable laser | |
| CN109273973B (en) | Dissipative soliton laser with 2-micron waveband | |
| CN112490834A (en) | Mode-locking ytterbium-doped fiber laser based on multimode fiber eccentric fusion | |
| CN110690640B (en) | Picosecond optical fiber seed laser source structure | |
| CN116231431A (en) | Novel mode-locked soliton fiber laser system based on space alignment structure | |
| CN211265955U (en) | Adjustable ultra-high repetition frequency ultra-short pulse fiber laser | |
| CN115296128A (en) | Nanosecond dissipative soliton erbium-doped fiber laser in positive dispersion area | |
| JP2008047790A (en) | Pulse laser apparatus | |
| CN202550278U (en) | Intracavity fiber coupling laser | |
| CN108039638B (en) | Low-threshold two-stage spectrum shaping flexible optical fiber high-power mode-locked laser | |
| CN112909715A (en) | Full polarization maintaining fiber ultrashort pulse laser | |
| KR100928242B1 (en) | All-optical pulsed fiber laser module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220114 |
|
| RJ01 | Rejection of invention patent application after publication |