CN201576883U - Wavelength-temperature tunable frequency doubled fiber laser - Google Patents
Wavelength-temperature tunable frequency doubled fiber laser Download PDFInfo
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- CN201576883U CN201576883U CN2009202518734U CN200920251873U CN201576883U CN 201576883 U CN201576883 U CN 201576883U CN 2009202518734 U CN2009202518734 U CN 2009202518734U CN 200920251873 U CN200920251873 U CN 200920251873U CN 201576883 U CN201576883 U CN 201576883U
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Abstract
The utility model discloses a wavelength-temperature tunable frequency doubled fiber laser, which comprises an erbium-doped fiber laser, erbium-ytterbium co-doped double-clad fiber amplifier and a multiplier system. Frequency doubled wavelength output by the laser is tunable while the structure is compact, and the laser can stably work for a long period of time, accordingly promotes wide production and popularization of frequency doubled lasers, increases product use experience of users, enhances market application prospect of the frequency doubled lasers, and has actual application significance.
Description
Technical field
The utility model relates to the energy utilization technology field, particularly relates to the frequency doubled light fibre laser of a kind of wavelength and temperature-tunable.
Background technology
Appearance along with novel high-quality nonlinear optical crystal and laser crystal, the laser freuqency doubling technology has obtained develop rapidly, become and widen the most frequently used, the effective method of optical maser wavelength, the commercialization of various frequency double lasers and extensive use have produced huge impetus to national economy and national defense construction.
But, for solid state laser frequency doubling system wherein commonly used, because huge, the formed beam quality of structure of solid state laser frequency doubling system is not good enough, and the frequency doubled light wavelength of output is single and untunable, conversion efficiency between fundamental frequency light and the frequency doubled light is low, therefore can't realize using widely, the production that badly influences frequency double laser is popularized.
The utility model content
In view of this, the purpose of this utility model provides the frequency doubled light fibre laser of a kind of wavelength and temperature-tunable, the frequency doubled light tunable wave length of its output, and compact conformation, can be competent at long-term and stably and work, therefore can promote the widespread production of frequency double laser to popularize, improve user's product use experience, strengthen the market application foreground of frequency double laser, have important practical application meaning.
For this reason, the utility model provides the frequency doubled light fibre laser of a kind of wavelength and temperature-tunable, includes erbium doped fiber laser, erbium ytterbium co doped double clad fiber amplifier and frequency doubling system;
Described erbium doped fiber laser is connected with the erbium ytterbium co doped double clad fiber amplifier and forms the fundamental frequency light source, described fundamental frequency light source is used to import fundamental frequency light, and carry out tuning and the formation frequency doubled light to the fundamental frequency light wavelength, then formed frequency doubled light and fundamental frequency light are exported to frequency doubling system together;
Described frequency doubling system is connected with the erbium ytterbium co doped double clad fiber amplifier, then received fundamental frequency light is separated with frequency doubled light, the final tunable frequency doubled light of output wavelength.
Preferably, described erbium doped fiber laser is for adopting the erbium doped fiber laser of ring cavity structure, include Polarization Controller 1 in the described erbium doped fiber laser, described Polarization Controller 1 connects adjustable light wave-filter 2, modulator 6 respectively, and described adjustable light wave-filter 2 connects Er-doped fiber 3, wavelength division multiplexer 4, semiconductor laser 5 successively;
Described modulator 6 connects optical isolator 7, fiber coupler 8 successively, and described semiconductor laser 5 is connected with fiber coupler 8 by wavelength division multiplexer 5, and described fiber coupler 8 is provided with the first laser output mouth 100.
Preferably, described wavelength division multiplexer 4 is that centre wavelength is the wavelength division multiplexer of 1480/1550nm, and described semiconductor laser 5 is that output optical maser wavelength is the semiconductor laser 5 of 1480nm.
Preferably, the two ends, the left and right sides of described erbium ytterbium co doped double clad fiber amplifier have the second laser input port 200 and the second laser output mouth 300 respectively, the described second laser input port 200 and first laser output mouth 100 welding mutually;
Described erbium ytterbium co doped double clad fiber amplifier includes input isolator 9, erbium ytterbium co doped double clad fiber 10, the crotch shape fiber coupler 11 that from left to right connects successively, described laser input port 200 joins with input isolator 9, described crotch shape fiber coupler 11 connects semiconductor laser 12, output isolator 13 successively, and the described output isolator 13 and the second laser output mouth 300 join.
Preferably, the length of described erbium ytterbium co doped double clad fiber 10 is 10m, and the inner cladding structure that it has is quincuncial structure, and its numerical aperture is 0.45, and its optical fiber external diameter is 125 μ m.
Preferably, the left end of described frequency doubling system has the 3rd laser input port 400, and described the 3rd laser input port 400 is connected with the second laser output mouth 300 of erbium ytterbium co doped double clad fiber amplifier;
Described the 3rd laser input port 400 connects wollaston prism 14, short focal length collimating lens 15, long-focus lens 16, frequency-doubling crystal 17, collimating lens 20, filter 21 successively.
Preferably, described frequency-doubling crystal 17 is placed in the temperature control box 19, and described temperature control box 19 is placed on the five times regualting frame 18.
Preferably, described frequency-doubling crystal 17 is any one in periodically poled lithium niobate crystal, period polarized potassium titanyl oxygenic phosphate(KTP) crystal, period polarized lithium tantalate, periodically poled lithium niobate crystal optical waveguide, period polarized potassium titanyl oxygenic phosphate(KTP) crystal fiber waveguide, the period polarized lithium tantalate fiber waveguide.
The technical scheme that is provided by above the utility model as seen, compared with prior art, the utility model provides the frequency doubled light fibre laser of a kind of wavelength and temperature-tunable, the frequency doubled light tunable wave length of its output, and compact conformation can be competent at long-term and stably and work, therefore can promote the widespread production of frequency double laser to popularize, improve user's product use experience, strengthen the market application foreground of frequency double laser, have important practical application meaning.
Description of drawings
Fig. 1 is the structural representation of the erbium doped fiber laser that had of the frequency doubled light fibre laser of a kind of wavelength that provides of the utility model and temperature-tunable;
The structural representation of the erbium ytterbium co doped double clad fiber amplifier that a kind of wavelength that Fig. 2 provides for the utility model and the frequency doubled light fibre laser of temperature-tunable are had;
The structural representation of the frequency doubling system that a kind of wavelength that Fig. 3 provides for the utility model and the frequency doubled light fibre laser of temperature-tunable are had;
Fig. 4 is in the utility model, uses the spectrogram of the frequency doubled light wavelength tuning of high-resolution spectroscopy instrument measurement;
Fig. 5 is the curve chart of the utility model frequency doubled light power output when continuous laser turns round;
Fig. 6 is the tuning curve figure of frequency-doubling crystal temperature;
Among the figure, 1 is Polarization Controller, and 2 is adjustable light wave-filter, 3 is Er-doped fiber, and 4 is wavelength division multiplexer, and 5 is semiconductor laser, 6 is modulator, 7 is optical isolator, and 8 is fiber coupler, and 9 is the input isolator, 10 is erbium ytterbium co doped double clad fiber, 11 is crotch shape fiber coupler, and 12 is semiconductor laser, and 13 is the output isolator, 14 is wollaston prism, 15 are short focal length collimating lens, and 16 are long condenser lens, and 17 is frequency-doubling crystal, 18 is five times regualting frame, 19 is temperature control box, and 20 is collimating lens, and 21 is filter, 100 is the first laser output mouth, 200 is the second laser input port, and 300 is the second laser output mouth, and 400 is the 3rd laser input port.
Embodiment
In order to make those skilled in the art person understand the utility model scheme better, the utility model is described in further detail below in conjunction with drawings and embodiments.
Referring to Fig. 1 to Fig. 3, the frequency doubled light fibre laser of a kind of wavelength that the utility model provides and temperature-tunable includes erbium doped fiber laser, erbium ytterbium co doped double clad fiber amplifier, frequency doubling system;
Described erbium doped fiber laser is connected with the erbium ytterbium co doped double clad fiber amplifier and forms the fundamental frequency light source, described fundamental frequency light source is used to import fundamental frequency light, and carry out tuning and the formation frequency doubled light to the fundamental frequency light wavelength, then formed frequency doubled light and fundamental frequency light are exported to frequency doubling system together; Described frequency doubling system is connected with the erbium ytterbium co doped double clad fiber amplifier, is used for received fundamental frequency light is separated with frequency doubled light, the final tunable frequency doubled light of output wavelength.Wherein:
Erbium doped fiber laser, adopt ring cavity structure, include Polarization Controller 1 in the erbium doped fiber laser of this ring cavity structure, described Polarization Controller 1 connects adjustable light wave-filter 2, modulator 6 respectively, and described adjustable light wave-filter 2 connects Er-doped fiber 3, wavelength division multiplexer 4, semiconductor laser 5 successively;
Described modulator 6 connects optical isolator 7, fiber coupler 8 successively, and described semiconductor laser 5 is connected with fiber coupler 8 by wavelength division multiplexer 5, and described fiber coupler 8 is provided with the first laser output mouth 100;
In the utility model, described wavelength division multiplexer 4 is that centre wavelength is the wavelength division multiplexer of 1480/1550nm; Described semiconductor laser 5 is that output optical maser wavelength is the semiconductor laser 5 of 1480nm, and the first laser output mouth 100 of erbium doped fiber laser can output wavelength be the laser of 1550nm;
Need to prove, adjustable light wave-filter 2 is as the frequency-selecting device in the annular chamber, can change the fundamental frequency light wavelength, can realize that in the 1528-1570nm scope continuous wavelength is adjustable, the bandwidth of 3dB is about 0.19nm, make erbium doped fiber laser have the tunable function of continuous wavelength in gain bandwidth, realize that the frequency doubled light wavelength is tunable within the specific limits.Erbium doped fiber laser of the present utility model can be worked under continuous impulse and two kinds of patterns of short pulse, and can both realize the continuously adjustable of frequency doubled light under each pattern.Under the short pulse pattern, need to add modulator 6 and carry out active mode locking.
The erbium ytterbium co doped double clad fiber amplifier is used for the fundamental frequency luminous power that the first laser output mouth 100 that erbium doped fiber laser has is exported is amplified;
Be specially: the two ends, the left and right sides of erbium ytterbium co doped double clad fiber amplifier have the second laser input port 200 and the second laser output mouth 300 respectively, the described second laser input port 200 and first laser output mouth 100 welding mutually;
Described erbium ytterbium co doped double clad fiber amplifier includes input isolator 9, erbium ytterbium co doped double clad fiber 10, the crotch shape fiber coupler 11 that from left to right connects successively, described laser input port 200 joins with input isolator 9, described crotch shape fiber coupler 11 connects semiconductor laser 12, output isolator 13 successively, and the described output isolator 13 and the second laser output mouth 300 join;
In the utility model, on the specific implementation, the length of described erbium ytterbium co doped double clad fiber 10 is preferably 10m, and its inner cladding structure optimization is quincuncial structure, and numerical aperture is preferably 0.45, and the optical fiber external diameter is preferably 125 μ m.
In the utility model, described semiconductor laser 12 specifically includes six multiple die semiconductor lasers; The optical maser wavelength that these six multiple die semiconductor lasers are exported is 976nm, and the peak power output of each semiconductor laser is about 1W, and the tail optical fiber of these six multiple die semiconductor lasers is the multimode fiber that is complementary with six multimode fiber numerical apertures.
Need to prove that the structure that adopts in view of described erbium ytterbium co doped double clad fiber amplifier is the backward pump mode, thereby can guarantee to have bigger power output.Wherein, input isolator 9 and output isolator 13 are used for suppressing because the laser generation that causes of end face reflection, thereby increases the job stability of this erbium ytterbium co doped double clad fiber amplifier.
The left end of frequency doubling system has the 3rd laser input port 400, and described the 3rd laser input port 400 is connected with the second laser output mouth 300 of erbium ytterbium co doped double clad fiber amplifier;
Described the 3rd laser input port 400 connects wollaston prism 14, short focal length collimating lens 15, long-focus lens 16, frequency-doubling crystal 17, collimating lens 20, filter 21 successively, after fundamental frequency light carries out the polarization selection through wollaston prism 14, fundamental frequency light is focused to the center of frequency-doubling crystal 17 by long-focus lens 16, after passing through collimating lens 20 then, by filter 21 fundamental frequency light is separated with frequency doubled light, realize frequency doubled light output.
In the utility model, the frequency-doubling crystal 17 of described frequency doubling system is the periodically poled lithium niobate crystal that adopts quasi-phase matching, also can be period polarized potassium titanyl oxygenic phosphate(KTP) crystal or period polarized lithium tantalate, also can be periodically poled lithium niobate crystal optical waveguide, period polarized potassium titanyl oxygenic phosphate(KTP) crystal fiber waveguide or period polarized lithium tantalate fiber waveguide.
Referring to Fig. 3, in the utility model, described frequency-doubling crystal 17 is placed in the temperature control box 19, and described temperature control box 19 is placed on the five times regualting frame 18, thereby realizes best frequency doubled light output by frequency-doubling crystal 17 temperature controlling.
Referring to Fig. 1 to Fig. 3, the second laser input port 200 of first laser output mouth 100 of erbium doped fiber laser and ytterbium co-doped double-clad fiber amplifier is carried out welding, just constituted fundamental frequency the Lights section of the present utility model, it is that 0.01nm, model are that the spectroanalysis instrument of AQ6317B carries out observation and analysis that the fundamental frequency light of this fundamental frequency light source portion branch output can insert resolution.
In the utility model, the fundamental frequency light of fundamental frequency the Lights section output of the present utility model is regulated incident fundamental frequency polarization state of light through wollaston prism 14.
Fig. 4 has provided with high-resolution spectroscopy instrument (Ocean Optics, HR400) spectrogram of the frequency doubled light wavelength tuning of Ce Lianging.As can be seen from Figure 4, long by tuning fundamental light wave, the utility model can be implemented in the frequency doubled light output in 1548～1555nm tuning range, and the centre wavelength of fundamental frequency light output is at 1551.9nm, and Wavelength matched bandwidth is 2.1nm.
Fig. 5 has provided the curve chart of frequency doubled light power output when continuous laser turns round.From the power curve of Fig. 5 as can be seen, the frequency doubled light power output increases along with the increase of fundamental frequency luminous power, is the approximately linear variation tendency.Referring to shown in Figure 5, when the fundamental frequency luminous power is 616mW, obtained the frequency doubled light power of 90.6mW, the transformation efficiency between fundamental frequency light and the frequency doubled light is 14.7%.Because the power density of fundamental frequency light is lower during the continuous laser running,, can further improve the conversion efficiency of frequency doubled light if use the peak power of mode-locking technique raising fundamental frequency light.
Fig. 6 has provided the thermal tuning curve chart of frequency-doubling crystal.At the centre wavelength 1551.9nm place of frequency doubling system, regulate the temperature of periodically poled lithium niobate crystal in the temperature control box, can measure the frequency doubled light power under the different crystal temperature, the germ nucleus temperature is at 150.6 ℃, and the thermal tuning bandwidth is about 1.7 ℃.
For the utility model, it is long that it can utilize tunable optic filter to change fundamental light wave, realizes that the frequency doubled light wavelength is tuning within the specific limits.And utilize wollaston prism to select incident fundamental frequency polarization state of light, for the periodically poled lithium niobate crystal, select the e light polarization usually, to utilize the maximum non linear coefficient of crystal.In addition, by the frequency-doubling crystal temperature controlling, realize the optimal power output of frequency doubled light at specific wavelength.By above-mentioned characteristic as can be known, the fundamental frequency light of the fiber laser output that the utility model provides changes output wavelength through adjustable light wave-filter 2, carrying out polarization state by wollaston prism 14 then selects, long condenser lens 16 focuses to fundamental frequency light the center of frequency-doubling crystal 17, fundamental frequency light is separated promptly exportable frequency doubled light by filter 21 with frequency doubled light through collimating lens 20 backs.
In the utility model, the temperature control box 19 of placing frequency-doubling crystal 17 is placed on the five times regualting frame 18, is used to regulate the position of fundamental frequency light incident crystal.
For the utility model, because numerous advantages such as fiber laser has that threshold value is low, compact conformation and high performance price ratio, on the other hand based on ferroelectric crystal (as: lithium columbate crystal, crystal such as potassium titanium oxide phosphate) PHOTONICS MICROST RUCTURE compensates phase mismatch between fundamental light wave and frequency multiplication light wave, can realize high efficiency frequency-doubled conversion.The utility model is the effective ways that obtain compact conformation, high power, tunable, Wavelength stabilized double-frequency laser in conjunction with fiber laser and accurate phase matched frequency doubling technology.
Therefore, frequency doubled light fibre laser provided by the invention has compact conformation, good beam quality, working stability, easily realizes characteristics such as high power output, can realize full fiberize, overcome key issues such as common frequency double laser output wavelength is single, conversion efficiency is low simultaneously.The utility model can both be realized frequency multiplication output efficiently to continuous laser and pulse laser, and fiber laser is operated in the 1550nm wave band, and its frequency doubled light has potential application in a lot of fields, as laser fine processing etc.
In sum, compared with prior art, the utility model provides the frequency doubled light fibre laser of a kind of wavelength and temperature-tunable, the frequency doubled light tunable wave length of its output, and compact conformation can be competent at long-term and stably and work, therefore can promote the widespread production of frequency double laser to popularize, improve user's product use experience, strengthen the market application foreground of frequency double laser, have important practical application meaning.
The above only is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (8)
1. the frequency doubled light fibre laser of wavelength and temperature-tunable is characterized in that, includes erbium doped fiber laser, erbium ytterbium co doped double clad fiber amplifier and frequency doubling system;
Described erbium doped fiber laser is connected with the erbium ytterbium co doped double clad fiber amplifier and forms the fundamental frequency light source, described fundamental frequency light source is used to import fundamental frequency light, and carry out tuning and the formation frequency doubled light to the fundamental frequency light wavelength, then formed frequency doubled light and fundamental frequency light are exported to frequency doubling system together;
Described frequency doubling system is connected with the erbium ytterbium co doped double clad fiber amplifier, and received fundamental frequency light is separated with frequency doubled light, the final tunable frequency doubled light of output wavelength.
2. frequency doubled light fibre laser as claimed in claim 1, it is characterized in that, described erbium doped fiber laser is for adopting the erbium doped fiber laser of ring cavity structure, include Polarization Controller (1) in the described erbium doped fiber laser, described Polarization Controller (1) connects adjustable light wave-filter (2), modulator (6) respectively, and described adjustable light wave-filter (2) connects Er-doped fiber (3), wavelength division multiplexer (4), semiconductor laser (5) successively;
Described modulator (6) connects optical isolator (7), fiber coupler (8) successively, described semiconductor laser (5) is connected with fiber coupler (8) by wavelength division multiplexer (5), and described fiber coupler (8) is provided with the first laser output mouth (100).
3. frequency doubled light fibre laser as claimed in claim 2, it is characterized in that, described wavelength division multiplexer (4) is that centre wavelength is the wavelength division multiplexer of 1480/1550nm, and described semiconductor laser (5) is that output optical maser wavelength is the semiconductor laser (5) of 1480nm.
4. frequency doubled light fibre laser as claimed in claim 2, it is characterized in that, the two ends, the left and right sides of described erbium ytterbium co doped double clad fiber amplifier have the second laser input port (200) and the second laser output mouth (300) respectively, the described second laser input port (200) and first laser output mouth (100) welding mutually;
Described erbium ytterbium co doped double clad fiber amplifier includes input isolator (9), erbium ytterbium co doped double clad fiber (10), the crotch shape fiber coupler (11) that from left to right connects successively, described laser input port (200) joins with input isolator (9), described crotch shape fiber coupler (11) connects semiconductor laser (12), output isolator (13) successively, and described output isolator (13) joins with the second laser output mouth (300).
5. frequency doubled light fibre laser as claimed in claim 4 is characterized in that, the length of described erbium ytterbium co doped double clad fiber (10) is 10m, and the inner cladding structure that it has is quincuncial structure, and its numerical aperture is 0.45, and its optical fiber external diameter is 125 μ m.
6. frequency doubled light fibre laser as claimed in claim 4, it is characterized in that, the left end of described frequency doubling system has the 3rd laser input port (400), and described the 3rd laser input port (400) is connected with the second laser output mouth (300) of erbium ytterbium co doped double clad fiber amplifier;
Described the 3rd laser input port (400) connects wollaston prism (14), short focal length collimating lens (15), long-focus lens (16), frequency-doubling crystal (17), collimating lens (20), filter (21) successively.
7. frequency doubled light fibre laser as claimed in claim 6 is characterized in that, described frequency-doubling crystal (17) is placed in the temperature control box (19), and described temperature control box (19) is placed on the five times regualting frame (18).
8. frequency doubled light fibre laser as claimed in claim 6, it is characterized in that described frequency-doubling crystal (17) is any one in periodically poled lithium niobate crystal, period polarized potassium titanyl oxygenic phosphate(KTP) crystal, period polarized lithium tantalate, periodically poled lithium niobate crystal optical waveguide, period polarized potassium titanyl oxygenic phosphate(KTP) crystal fiber waveguide, the period polarized lithium tantalate fiber waveguide.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202518734U CN201576883U (en) | 2009-12-22 | 2009-12-22 | Wavelength-temperature tunable frequency doubled fiber laser |
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| CN2009202518734U CN201576883U (en) | 2009-12-22 | 2009-12-22 | Wavelength-temperature tunable frequency doubled fiber laser |
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| CN201576883U true CN201576883U (en) | 2010-09-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109873291A (en) * | 2019-04-10 | 2019-06-11 | 山西大学 | A kind of all solid state laser of exportable three kinds of wavelength |
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2009
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109873291A (en) * | 2019-04-10 | 2019-06-11 | 山西大学 | A kind of all solid state laser of exportable three kinds of wavelength |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100908 Termination date: 20121222 |