CN218472524U - All-fiber multi-wavelength fiber laser based on different Raman frequency shift quantities - Google Patents
All-fiber multi-wavelength fiber laser based on different Raman frequency shift quantities Download PDFInfo
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- CN218472524U CN218472524U CN202222577718.XU CN202222577718U CN218472524U CN 218472524 U CN218472524 U CN 218472524U CN 202222577718 U CN202222577718 U CN 202222577718U CN 218472524 U CN218472524 U CN 218472524U
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Abstract
The utility model relates to an all-fiber multi-wavelength fiber laser based on different raman frequency shift volume, its characterized in that: the mode matcher is connected with the laser light source and the Raman resonant cavity structure; the Raman fiber light source comprises a laser light source pumping source, a mode matcher, a first-stage Raman high-reflection grating, a second-stage Raman fiber B, a second-stage Raman low-reflection grating and a filter, wherein light emitted by the laser light source pumping source is input through the mode matcher, the output end of the mode matcher is connected with the first-stage Raman high-reflection grating, the first-stage Raman high-reflection grating is connected with one end of a Raman fiber A, the other end of the Raman fiber A is connected with the first-stage Raman low-reflection grating, the first-stage Raman low-reflection grating is connected with the second-stage Raman high-reflection grating, the second-stage Raman high-reflection grating is connected with one end of the Raman fiber B, the other end of the Raman fiber B is connected with the second-stage Raman low-reflection grating, and the second-stage Raman low-reflection grating is connected with the filter. The high-power all-fiber multi-wavelength optical fiber laser light source can output high-power all-fiber multi-wavelength optical fiber laser light sources within the range of 400nm-2400nm, and the ratio of the multi-wavelength output power can be controlled by adjusting the length of Raman gain light and the current of the attenuator.
Description
Technical Field
The utility model relates to an all-fiber multi-wavelength fiber laser based on different raman frequency shift amounts belongs to the optics field.
Background
The fiber laser has the advantages of compact structure, high efficiency, high beam quality and the like, and has important application in the fields of basic research, industrial processing, national defense, medical treatment and the like. The improvement of brightness and the expansion of working wavelength are two important directions of the development of laser technology, wherein the Raman fiber laser has unique advantages in the aspect of wavelength expansion.
At present, the crystal material or the optical fiber material of the all-solid-state laser is limited by the discrete energy level structure, only specific transition wavelengths can be output, and the emission cross section and the conversion efficiency of other transition wavelengths are lower except for specific wavelengths. The laser wavelength expansion can be realized by utilizing the nonlinear frequency conversion technology (frequency doubling technology, sum frequency technology, difference frequency technology and OPO), but the output laser characteristics can not meet the actual application requirements of continuous or special wavelength. Taking a solid laser with diamond as a Raman crystal as an example, firstly, the diamond manufacturing process and the application requirements are limited, the cross-sectional area of the used diamond crystal is small, and the requirements on the size of an input light spot and the optical design are extremely strict. Secondly, the laser needs to adopt a space resonant cavity structure for oscillation output, the cost of plating a special wavelength film on a cavity is high, and the long-term stability of the space cavity structure is poor.
The optical fiber supercontinuum light source is used as a novel laser light source, can generate supercontinuum laser of 400nm to 2400nm, and can output multi-wavelength laser in a wider spectral range. However, when optical requirements of a plurality of output wavelengths with large intervals are required, it is difficult to selectively filter the light beams of the unwanted spectrum, the output power of the white laser is low, and the output power ratio between the wavelengths is fixed.
Compared with a fiber laser, the semiconductor laser has a poor output light spot mode, the multi-wavelength semiconductor laser is formed by transversely arranging laser diodes with different wavelengths, the structure causes the distance between light emitting points of laser diode chips to become long, the optical design is difficult, and a proper heat dissipation system needs to be designed because the temperature of the laser diodes is high during working.
Disclosure of Invention
The utility model discloses to the problem that current multi-wavelength raman solid, optic fibre, semiconductor laser production technology exist, provide an all-fiber multi-wavelength fiber laser based on different raman frequency shift volume, utilize cascade raman grating, wavelength division multiplexer and attenuator common control multi-wavelength laser's output mode promptly to realize all-fiber multi-wavelength fiber laser.
The technical scheme of the utility model is realized like this: an all-fiber multi-wavelength fiber laser based on different Raman frequency shift amounts comprises a laser source, a mode matcher, a primary Raman grating, a Raman fiber, a secondary Raman grating and a filter; the method is characterized in that: the mode matcher is connected with a laser light source and a Raman resonant cavity structure; the Raman fiber light source comprises a laser light source pumping source, a mode matcher, a first-stage Raman high-reflection grating, a second-stage Raman fiber B, a second-stage Raman low-reflection grating and a filter, wherein light emitted by the laser light source pumping source is input through the mode matcher, the output end of the mode matcher is connected with the first-stage Raman high-reflection grating, the first-stage Raman high-reflection grating is connected with one end of a Raman fiber A, the other end of the Raman fiber A is connected with the first-stage Raman low-reflection grating, the first-stage Raman low-reflection grating is connected with the second-stage Raman high-reflection grating, the second-stage Raman high-reflection grating is connected with one end of the Raman fiber B, the other end of the Raman fiber B is connected with the second-stage Raman low-reflection grating, and the second-stage Raman low-reflection grating is connected with the filter.
The laser light source comprises an optical fiber continuous laser, a single-frequency laser and a pulse laser, and the laser light source provides suitable pumping wavelength output for Raman laser.
The Raman resonant cavity structure is composed of a primary Raman grating and a Raman gain fiber containing doped ions, and an input pumping light source generates primary Raman laser after Raman frequency shift and provides a pumping light source for the secondary Raman frequency shift.
The Raman fiber is a phosphorus-doped quartz fiber or a germanium-doped fiber.
The Raman laser frequency shift range of the Raman resonant cavity is 0-800cm -1 And 1326. + -. 30cm -1 。
The positive effect of the utility model is based on the Raman fiber laser of stimulated Raman scattering in the optical fiber, which has the characteristics of wide gain spectrum, cascade working, no need of phase matching and the like, and can generate laser output with the wavelength of 400nm-2400nm range in the optical fiber transparent range as long as pumping laser with proper wavelength exists; the Raman fiber laser is a fiber laser which can simultaneously realize high power and broadband output at present; at present, the power of the Raman fiber laser can reach several kilowatts near the wavelength of 1.1 mu m; as the wavelength increases, its power decreases exponentially. The Raman gain fiber mainly comprises quartz fiber (including germanium-doped and phosphorus-doped quartz fiber), fluoride fiber, chalcogenide fiber and the like. Through the analysis of the working wavelength of the Raman gain optical fiber and the Raman gain spectral line, the multi-wavelength selection of the mutual combination of different Raman frequency shift quantities is designed; under the condition of energy supply of a pump laser in a wide spectral range, the output of a high-power all-fiber multi-wavelength optical fiber laser light source in the range of 400nm-2400nm can be realized by combining a nonlinear frequency conversion technology, and the ratio of the multi-wavelength output power can be controlled by adjusting the length of Raman gain light and the current of an attenuator.
Drawings
Fig. 1 is a schematic diagram of an all-fiber multi-wavelength fiber laser of the present invention with different raman frequency shift amounts.
The Raman spectrometer comprises a laser source 1, a pattern matcher 2, a primary Raman grating 3, a Raman fiber A4, a secondary Raman grating 5, a Raman fiber B6 and a filter 7.
FIG. 2 is a Raman gain spectrum of a phosphor-doped fiber.
Fig. 3 is a structural diagram of a 1240nm and 1310nm multi-wavelength fiber laser with different raman frequency shift amounts.
The device comprises a semiconductor pumping source 8, a beam combiner 9, a 1064nm low-reflection grating 10, ytterbium-doped fibers 11, a mode matcher 2, a 1240nm Raman grating 12, raman fibers A4, raman fibers B6, a 1310nm grating 13 and a filter 7.
Detailed Description
The invention is further described with reference to the following figures and examples: as shown in fig. 1, an all-fiber multi-wavelength fiber laser based on different raman frequency shift amounts includes a laser source 1, a pattern matcher 2, a first-order raman high-reflection grating 3-1, a raman fiber A4, a raman fiber B6, a second-order raman high-reflection grating 5-1, and a filter 7; the method is characterized in that: the mode matcher 2 is connected with the laser light source 1 and the Raman resonant cavity structure; light emitted by a pumping source of a laser light source 1 is input through a mode matcher 2, the output end of the mode matcher 2 is connected with a first-stage Raman high-reflection grating 3-1, the first-stage Raman high-reflection grating 3-1 is connected with one end of a Raman fiber A4, the other end of the Raman fiber A4 is connected with a first-stage Raman low-reflection grating 3-2, the first-stage Raman low-reflection grating 3-2 is connected with a second-stage Raman high-reflection grating 5-1, the second-stage Raman high-reflection grating 5-1 is connected with one end of a Raman fiber B6, the other end of the Raman fiber B6 is connected with the second-stage Raman low-reflection grating 5-2, and the second-stage Raman low-reflection grating 5-2 is connected with a filter 7.
As shown in FIG. 2, in order to realize a combination of different Raman frequency shifts to realize a multi-wavelength selectable laser, the Raman gain spectrum of the doped fiber is 0-800cm -1 And 1326. + -. 30cm -1 Optionally selecting and combining to output selectable multi-wavelength Raman laser.
As shown in fig. 3, a multi-wavelength fiber laser with different raman frequency shifts of 1240nm and 1310nm includes a semiconductor pump source 8, a beam combiner 9, a 1064nm low-reflectivity grating 10, an ytterbium-doped fiber 11, a mode matcher 2, a raman fiber A4, a 1240nm raman high-reflectivity grating 12-1, a 1311nm raman high-reflectivity grating 13, a raman fiber B6, and a filter 7; the method is characterized in that: light emitted by a semiconductor pumping source 8 is input into a 1064nm resonant cavity through a beam combiner 9, is subjected to ion beam inversion with ytterbium-doped fibers 11 to generate 1064nm laser, is output from a 1064nm low-reflection grating 10, the 1064nm low-reflection grating 10 is connected with a mode matcher 2, the mode matcher 2 is connected with a 1240nm Raman high-reflection grating 12-1, the 1240n Raman high-reflection grating 12-1 is connected with one end of a Raman fiber A4, the other end of the Raman fiber A4 is connected with a 1240nm low-reflection grating 12-2, the output end of the 1240nm low-reflection grating 12-2 is connected with a 1311nm high-reflection grating 13-1, the 1311nm Raman high-reflection grating 13-1 is connected with one end of a Raman fiber B6, the other end of the Raman fiber B6 is connected with a 1311nm Raman low-reflection grating 13-2, the 1311nm Raman low-reflection grating 13-2 is connected with a filter 7, and finally, the filter 7 outputs 1311nm and 1240nm multi-wavelength laser.
Preferably, the semiconductor pump source 8 is a 33w semiconductor laser with wavelength of 920nm which is less affected by temperature; or selecting a pump source with the wavelength range of 910 to 976 nm.
Preferably, the combiner 9 is 3+1 input model, or an N +1 input model scheme optimized structure is selected, so as to achieve the purpose of improving the injection power.
Preferably, the 1064nm grating forms a resonant cavity structure for providing stable and reliable pump laser for the subsequent raman laser.
Preferably, the ytterbium-doped fiber is a pumping light source which can provide higher conversion efficiency for the gain medium.
Preferably, the mode matcher 2 is connected with the pump laser and the Raman resonant cavity structure, so that lower fusion loss can be guaranteed.
Preferably, the Raman fiber is a phosphorus-doped fiber, and the Raman frequency shift amount of the phosphorus-doped fiber is 429.35cm -1 And 1326.5cm -1 。
Preferably, the 1240nm raman grating provides a primary raman cavity structure to provide a suitable pump source for secondary raman generation.
Preferably, the 1311nm raman grating provides a two-level raman cavity structure that provides the output of a laser source of the desired wavelength.
Preferably, the filter 7 removes redundant impurity light sources, and long-term reliability of the multi-wavelength laser is guaranteed.
Claims (6)
1. An all-fiber multi-wavelength fiber laser based on different Raman frequency shift amounts comprises a laser source, a mode matcher, a primary Raman grating, a Raman fiber, a secondary Raman grating and a filter; the method is characterized in that: the mode matcher is connected with the laser light source and the Raman resonant cavity structure; the Raman fiber light source comprises a laser light source pumping source, a mode matcher, a first-stage Raman high-reflection grating, a second-stage Raman fiber B, a second-stage Raman low-reflection grating and a filter, wherein light emitted by the laser light source pumping source is input through the mode matcher, the output end of the mode matcher is connected with the first-stage Raman high-reflection grating, the first-stage Raman high-reflection grating is connected with one end of a Raman fiber A, the other end of the Raman fiber A is connected with the first-stage Raman low-reflection grating, the first-stage Raman low-reflection grating is connected with the second-stage Raman high-reflection grating, the second-stage Raman high-reflection grating is connected with one end of the Raman fiber B, the other end of the Raman fiber B is connected with the second-stage Raman low-reflection grating, and the second-stage Raman low-reflection grating is connected with the filter.
2. The all-fiber multi-wavelength fiber laser based on different raman frequency shifts of claim 1, wherein the laser source comprises a fiber continuum laser, a single frequency laser, a pulse laser providing suitable pump wavelength output for raman laser.
3. The all-fiber multi-wavelength fiber laser based on different Raman frequency shift amounts as claimed in claim 1, wherein the Raman resonator structure is composed of a primary Raman grating and a Raman gain fiber containing doped ions, and the input pump light source generates primary Raman laser light after Raman frequency shift to provide a suitable pump light source for the secondary Raman frequency shift.
4. The all-fiber multi-wavelength fiber laser based on different Raman frequency shift quantities as claimed in claim 1, wherein the Raman fiber is a phosphor-doped silica fiber or a germanium-doped fiber.
5. The all-fiber multi-wavelength fiber laser based on different Raman frequency shift amounts as claimed in claim 2, wherein the laser source is a high power continuous laser for outputting a high power multi-wavelength Raman fiber laser; the single-frequency laser realizes the output of narrow-linewidth multi-wavelength Raman laser; the pulse laser realizes the output of high-peak power multi-wavelength Raman laser.
6. The all-fiber multi-wavelength fiber laser based on different Raman frequency shift amounts as claimed in claim 1, wherein the Raman laser frequency shift amount of the Raman resonant cavity is in the range of 0-800cm -1 And 1326. + -.30 cm -1 。
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