CN205406951U - High -power fiber laser of inner chamber doubling of frequency - Google Patents
High -power fiber laser of inner chamber doubling of frequency Download PDFInfo
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- CN205406951U CN205406951U CN201620153600.6U CN201620153600U CN205406951U CN 205406951 U CN205406951 U CN 205406951U CN 201620153600 U CN201620153600 U CN 201620153600U CN 205406951 U CN205406951 U CN 205406951U
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Abstract
The utility model discloses a high -power fiber laser of inner chamber doubling of frequency, include: two frequency doubling systems of optic fibre laser resonator and inner chamber: optic fibre laser resonator includes that at least a pair of chamber mirror forms the resonant cavity, and the resonant cavity is equipped with: at least a set of high power pump light source, at least one fiber combiner form population inversion, at least one signal wavelength selector, the inclined to one side rare -earth doped fiber of at least one section big mould field double -contracting layer guarantor with pumping optical coupling to active optical fibre, two frequency doubling systems of inner chamber include: at least one second harmonic generation crystal, at least one speculum and at least one double -colored mirror, laser beam is exported by double -colored mirror after the second harmonic generation crystal. The utility model discloses a high -power fiber laser of inner chamber doubling of frequency adopts the big mould field optic fibre in double -contracting layer, improves the output of the fine laser of near infrared, through the mode of intracavity frequency doubling, is showing and is improving two frequency -doubled conversion efficiency, utilizes polarization maintaining fiber to make optic fibre near -infrared polarization of laser output direction unanimous with the second harmonic generation crystal, obtains stable two doublings of frequency output.
Description
Technical field
This utility model relates to fiber laser technology field, particularly relates to a kind of inner cavity frequency-doubling high power fiber laser.
Background technology
Optical fiber laser refers to doped rare earth element glass optical fiber as the laser instrument of gain media, has good beam quality, simple in construction, life-span length, conversion efficiency advantages of higher, and its main performance has been substantially better than traditional solid state laser, CO2Laser instrument etc., become fresh combatants with fastest developing speed on industrial lasers market.
By different doped with rare-earth elements (such as ytterbium, erbium, thulium), optical fiber laser can realize the near-infrared laser output of different-waveband.And for obtaining visible ray, then generally need to by utilizing nonlinear optical crystal to carry out frequency multiplication.The same with other nonlinear frequency transformation effect, only beat the light intensity in nonlinear crystalline material sufficiently large time just can have higher frequency transformation efficiency, for this peak power of continuous light relatively low in the case of then conversion efficiency is very low.Intracavity frequency doubling has been widely used in solid state laser frequency multiplication, but also rare in optical fiber laser field.Relatively early that optical fiber laser is combined by proposition with nonlinear optics frequency multiplication is Zediker of McDonnelDouglas company of the U.S. et al., but owing to large mode field double clad protected the restriction of inclined rare earth doped fiber technical development at that time, the program can not realize powerful output.
Utility model content
The purpose of this utility model is in that to provide a kind of inner cavity frequency-doubling high power fiber laser, particularly relates to a kind of inner cavity frequency-doubling high power fiber laser protecting inclined rare earth doped fiber based on large mode field double clad.For solving in prior art the technical problem that visible ray frequency-doubling conversion efficiency is low, output is low.
For reaching above-mentioned purpose, the proposed technical scheme of this utility model is:
A kind of inner cavity frequency-doubling high power fiber laser, comprising:
Optical fiber laser resonant cavity:
Described optical fiber laser resonant cavity includes at least one pair of chamber mirror, is provided with in described optical fiber laser resonant cavity: coupling pump light to Active Optical Fiber is formed population inversion, at least one signal wavelength selector, at least one section of large mode field double clad inclined rare earth doped fiber of guarantor by least one set high power pump source, at least one optical-fiber bundling device；
Inner chamber two frequency doubling system:
Described inner chamber two frequency doubling system includes: at least one frequency-doubling crystal, at least one reflecting mirror and at least one can by intracavity two frequency doubled light take out and make fundamental frequency light still intracavity concussion dichroic mirror or Dispersive Devices.
Wherein, described high power pump source includes: high power multimode semiconductor laser and drive power supply, by powering continuously to described high power pump source or be modulated, it is achieved laser is continuous or quasi-continuous output.
Wherein, in the uptake zone that wavelength is institute's doped with rare-earth elements in described high power pump source, the wavelength of the pumping source used for Yb dosed optical fiber is 900 to 980 nanometers.
Wherein, described optical-fiber bundling device is the pumped fiber based on fused biconical taper technology/signal bundling device.
Wherein, described optical-fiber bundling device includes the bundling device that flashlight and pump light are combined by least one dichroic mirror and two collimating lens.
Wherein, described signal wavelength selector is the narrow linewidth optical filter at desired signal wavelength place.
Wherein, described signal wavelength selector is the reflective Volume Bragg grating to selected wavelength diffractive.
Wherein, described large mode field double clad is protected the core diameter of inclined rare earth doped fiber and is not less than 10 microns.
Wherein, described frequency-doubling crystal is the frequency doubling non-linear's crystal used in the laser of polarizing emission, including three Lithium biborates, potassium titanium oxide phosphate, BBO Crystal.
Wherein, described chamber mirror is least one set completely reflecting mirror.
Wherein, described chamber mirror is at least one completely reflecting mirror and at least one emission-type body grating.
Wherein, the polarization spectroscope consistent with the output polarization of polarization maintaining optical fibre can be placed in described optical fiber laser resonant cavity, it is suppressed that the gain in resonator cavity of the s polarized light.
Wherein, the described polarization spectroscope in optical fiber laser resonant cavity is also as frequency multiplication output device.
Compared with prior art, a kind of inner cavity frequency-doubling high power fiber laser of this utility model, adopt double cladding large mode field optical fiber, improve the output of near-infrared fibre-optical laser；By the mode of intracavity frequency doubling, significantly improve the conversion efficiency of two frequencys multiplication；Polarization maintaining optical fibre is utilized to make the output of Fiber optic near infrared spectroscopy laser consistent with frequency-doubling crystal, thus obtaining two stable frequency multiplication outputs.
Accompanying drawing explanation
Fig. 1 is the structural representation of this utility model inner cavity frequency-doubling high power fiber laser first embodiment.
Fig. 2 is the structural representation of this utility model inner cavity frequency-doubling high power fiber laser the second embodiment.
Detailed description of the invention
Below with reference to accompanying drawing, this utility model is given elaboration further.
Referring to accompanying drawing 1, it is the first embodiment of a kind of high-power inner cavity frequency-doubling optical fiber laser, in this embodiment comprising: optical fiber laser resonant cavity and inner chamber two frequency doubling system form.
Described optical fiber laser resonant cavity includes: optical fiber laser high power pump source 5, described front, high power pump source 5 is provided with collimating lens 4, described collimating lens 4 front is provided with the dichroic mirror 3 that one 45 ° of directions are placed, the front of described dichroic mirror 3 and collimating lens 4 vertical direction is provided with collimating lens 6, large mode field double clad protects inclined rare earth doped fiber 7 and extender lens 8, and the rear of described dichroic mirror 3 and collimating lens 4 vertical direction is additionally provided with narrow linewidth optical filter 2 and a completely reflecting mirror 1.
Wherein, described high power pump source 5 is made up of with driving power supply at the multimode semiconductor laser of 900 nm n wavelength, each semiconductor laser power is tens of watts or even upper hectowatt, the wavelength of its output can be 975 nm, 940 nm or 915 nm, it is preferred that adopting wavelength is 975 nanometers.By powering continuously to described high power pump source 5 or be modulated, it is achieved laser is continuous or quasi-continuous output.
Wherein, dichroic mirror 3 and collimating lens 4, collimating lens 6 are the optical-fiber bundling device in the implementation case, it is achieved that the combination of flashlight and pump light.
Wherein narrow linewidth optical filter 2 and reflecting mirror 1 are that the signal wavelength in the implementation case selects and chamber mirror combiner.
Wherein, it is that the large mode field double clad in the implementation case protects inclined Yb dosed optical fiber that large mode field double clad protects inclined rare earth doped fiber 7, large mode field optical fiber is by increasing fibre core diameter, its diameter can be 10 microns, 25 microns, 30 microns, thus significantly improving the power that optical fiber can bear, double-clad structure then can so that pump light be had an effect at the doped with rare-earth elements of thicker inner cladding Yu fibre core, so that high power pumping is possibly realized and keeps the light beam of flashlight to export quality, rare fiber lengths is partially mixed by selecting suitable large mode field double clad to protect, make pump absorption rate more than 10dB；Select polarization maintaining optical fibre that polarization of laser output can be made to polarize selection with nonlinear optics frequency-doubling crystal hereafter consistent thus obtaining high conversion efficiency.
Wherein, described extender lens 8 is placed on the ad-hoc location of optical fiber output, to increase operating distance.
Wherein, extender lens 8 total reflective mirror 9 near waist below forms the chamber mirror in 2 mirror chambeies of optical fiber laser resonant cavity with total reflective mirror 1.
In this embodiment, inner chamber two frequency doubling system includes the frequency-doubling crystal 10 being positioned at described completely reflecting mirror 9 rear, and is positioned at the dichroic mirror 11 at frequency-doubling crystal 10 rear, and laser beam is exported by dichroic mirror 11 after frequency-doubling crystal 10.
Wherein, described frequency-doubling crystal 10 is the frequency-doubling crystal of I type phase matched used in the laser of polarizing emission, such as three Lithium biborates, potassium titanium oxide phosphate, BBO Crystal, also includes the firing equipment that frequency-doubling crystal carries out temperature control.
Wherein, described total reflective mirror 9, two frequency doubling green lights are totally reflected, near infrared light is anti-reflection.
Wherein, near infrared light is totally reflected by described dichroic mirror 11, and frequency doubled light is anti-reflection, makes two frequency doubled light outputs.
The implementation case high-power inner cavity frequency-doubling optical fiber laser specific works pattern is: wavelength is in the diode-end-pumped source 5 of 976 nanometers, being reflected by dichroic mirror 3 by collimating lens 4 and be coupled to large mode field again through collimating lens 6 and protect the large mode field double clad partially mixing ytterbium and protect and partially mix rare optical fiber 7, large mode field double clad is protected the flashlight partially mixing the output of rare optical fiber 7 one end and is collimated and pass through dichroic mirror 3 selected the output wavelength (such as 1064 nanometers) of near infrared light by narrow linewidth optical filter 2 and total reflective mirror 1 by collimating lens 6.Large mode field double clad is protected the other end partially mixing rare optical fiber 7 and is converged to frequency-doubling crystal 10 by extender lens 8, places total reflective mirror 9 and dichroic mirror 11 respectively in frequency-doubling crystal 10 both sides, makes two frequency doubling green lights export through dichroic mirror 11.
Referring to accompanying drawing 2, it is the second example structure figure of this kind of high-power inner cavity frequency-doubling optical fiber laser, comprising: optical fiber laser resonant cavity and inner chamber two frequency doubling system.
Described optical fiber laser resonant cavity includes: some high power pump sources 15, described rear, high power pump source 15 is sequentially provided with an optical-fiber bundling device 16, large mode field double clad is protected and partially mixed rare optical fiber 7, photospallation device 18, collimator 19, polarization spectroscope 20 and extender lens 8, and the front in described some high power pump sources 15 is sequentially provided with cladding light detacher 14, tail optical fiber collimator 13 and reflective Bragg grating 12.
Wherein, described pumping former 15 is by some multimode semiconductor laser and drives power supply to form, and output wavelength can be 975 nanometers, 940 nanometers or 915 nanometers, it is preferred that adopts 975 nanometers.
Wherein said optical-fiber bundling device 16 is the pumped fiber based on fused biconical taper technology/signal bundling device, combines by 900 nm flashlights with 1030-1080 nanometer of pump light.
Wherein, described reflective Volume Bragg grating 12 is that the signal wavelength in the implementation case selects and chamber mirror combiner.
Wherein, beam expanding lens 8 completely reflecting mirror 22 near waist below and emission-type body grating 12 form two chamber mirrors of fiber resonance cavity.
Wherein, it is that the large mode field double clad in the implementation case protects inclined Yb dosed optical fiber that described large mode field double clad guarantor mixes rare optical fiber 7 partially, large mode field optical fiber (can be 10 microns by increasing fibre core diameter, 25 microns, 30 microns) thus significantly improving the power that optical fiber can bear, double-clad structure then can so that pump light be had an effect at the doped with rare-earth elements of thicker inner cladding Yu fibre core, so that high power pumping is possibly realized and keeps the light beam of flashlight to export quality (close to diffraction limit), rare fiber lengths is partially mixed by selecting suitable large mode field double clad to protect, make pump absorption rate more than 10dB；Select polarization maintaining optical fibre that polarization of laser output can be made to polarize selection with nonlinear optics frequency-doubling crystal hereafter consistent thus obtaining high conversion efficiency.Pump light is made to be not leaked at inner cladding.
Wherein, described optical fiber collimator 13,19 is two tail optical fiber collimators in the implementation case, and welding is at the two ends of fiber resonance cavity.Its effect is that the transmission light in optical fiber is transformed into collimated light (directional light), or parallel for the external world (less parallel) is optically coupled in single-mode fiber.
Two described frequency doubling systems include the dichroic mirror 21 and the frequency-doubling crystal 10 that are positioned at described extender lens 8 rear.Laser beam, through frequency-doubling crystal 10, reflects then through completely reflecting mirror 22 and is exported by dichroic mirror 21.
Wherein, described frequency-doubling crystal 10 is the frequency-doubling crystal of I type phase matched used in the laser of polarizing emission, such as three Lithium biborates, potassium titanium oxide phosphate, BBO Crystal, also includes the firing equipment that frequency-doubling crystal carries out temperature control.
Wherein, two frequency doubling green light total reflections and near infrared light are all totally reflected by described total reflective mirror 22.
Wherein, described dichroic mirror 21 is anti-reflection near infrared light, and frequency doubled light is totally reflected, and makes two frequency doubling green light outputs.
The implementation case high-power inner cavity frequency-doubling optical fiber laser specific works pattern is: n (n=6) individual wavelength is the high power multimode semiconductor laser pumping source 15 of 976 nanometers, partially mix ytterbium large mode field double clad guarantor by (n+1) x1 pumped fiber/signal bundling device 16 with large mode field double clad guarantor and partially mix the welding of rare optical fiber 7, wherein weld painting low-refraction glue 17 makes pump light be not leaked at inner cladding, produces near-infrared laser at intracavity.One end output of fiber resonance cavity is collimated by optical fiber collimator 13 and is returned by reflective Volume Bragg grating 12 diffraction, and to select the wavelength of flashlight, it is also possible to realize wavelength tuning by rotating grating 12, scope is at 1030-1080 nanometer.Protected unabsorbed pump light after partially mixing rare optical fiber 7 to remove by fibre cladding photospallation device 18,14 by large mode field double clad.Protect the other end welding optic fibre collimator 19 partially mixing rare optical fiber 7 in large mode field double clad, its outfan is placed polarization spectroscope 20 and is polarized consistent (p-polarization) with the output of polarization maintaining optical fibre, suppresses the gain in resonator cavity of the s polarized light further.Frequency-doubling crystal 10 is converged to afterwards by extender lens 8, dichroic mirror 21 is placed respectively near infrared light is anti-reflection in frequency-doubling crystal 10 both sides, frequency doubled light is all-trans, and frequency doubled light and near infrared light are all all-trans by total reflective mirror 22, make two frequency doubling green lights be reflected output by tilting dichroic mirror 21.
Summary embodiment one and embodiment two, it will thus be seen that
Inner cavity frequency-doubling high power fiber laser of the present utility model, comprising: optical fiber laser resonant cavity and two big parts of inner chamber two frequency doubling system.
Wherein, optical fiber laser resonant cavity includes at least one pair of chamber mirror, is provided with in described optical fiber laser resonant cavity: coupling pump light to Active Optical Fiber is formed population inversion, at least one signal wavelength selector, at least one section of large mode field double clad inclined rare earth doped fiber of guarantor by least one set high power pump source, at least one optical-fiber bundling device.
Wherein, inner chamber two frequency doubling system: described inner chamber two frequency doubling system includes: at least one frequency-doubling crystal, at least one reflecting mirror and at least one can by intracavity two frequency doubled light take out and make fundamental frequency light still intracavity concussion dichroic mirror or Dispersive Devices.
More specifically, above-mentioned high power pump source includes: high power multimode semiconductor laser and drive power supply, by powering continuously to described high power pump source or be modulated, it is achieved laser is continuous or quasi-continuous output.In the uptake zone that wavelength is institute's doped with rare-earth elements in above-mentioned high power pump source, the wavelength of the pumping source used for Yb dosed optical fiber is 900 to 980 nanometers.Optical-fiber bundling device is the pumped fiber based on fused biconical taper technology/signal bundling device.Optical-fiber bundling device includes the bundling device that flashlight and pump light are combined by least one dichroic mirror and two collimating lens.Wherein, signal wavelength selector is the narrow linewidth optical filter at desired signal wavelength place.
Wherein, described signal wavelength selector is the reflective Volume Bragg grating to selected wavelength diffractive.Large mode field double clad is protected the core diameter of inclined rare earth doped fiber and is not less than 10 microns.
Frequency-doubling crystal is the frequency doubling non-linear's crystal used in the laser of polarizing emission, including three Lithium biborates, potassium titanium oxide phosphate, BBO Crystal.Described chamber mirror is least one set completely reflecting mirror, it is also possible to be at least one completely reflecting mirror and at least one emission-type body grating.
Wherein, the polarization spectroscope consistent with the output polarization of polarization maintaining optical fibre can be placed in described optical fiber laser resonant cavity, it is suppressed that the gain in resonator cavity of the s polarized light.The above-mentioned polarization spectroscope in optical fiber laser resonant cavity is also as frequency multiplication output device.
Foregoing; it is only preferred embodiment of the present utility model; it is not intended to limit embodiment of the present utility model; those of ordinary skill in the art are according to central scope of the present utility model and spirit; corresponding flexible or amendment can be carried out very easily, therefore protection domain of the present utility model should be as the criterion with the protection domain required by claims.
Claims (13)
1. an inner cavity frequency-doubling high power fiber laser, it is characterised in that including:
Optical fiber laser resonant cavity:
Described optical fiber laser resonant cavity includes at least one pair of chamber mirror, is provided with in described optical fiber laser resonant cavity: coupling pump light to Active Optical Fiber is formed population inversion, at least one signal wavelength selector, at least one section of large mode field double clad inclined rare earth doped fiber of guarantor by least one set high power pump source, at least one optical-fiber bundling device；
Inner chamber two frequency doubling system:
Described inner chamber two frequency doubling system includes: at least one frequency-doubling crystal, at least one reflecting mirror and at least one can by intracavity two frequency doubled light take out and make fundamental frequency light still intracavity concussion dichroic mirror or Dispersive Devices.
2. inner cavity frequency-doubling high power fiber laser as claimed in claim 1, it is characterized in that, described high power pump source includes: high power multimode semiconductor laser and drive power supply, by powering continuously to described high power pump source or be modulated, it is achieved laser is continuous or quasi-continuous output.
3. inner cavity frequency-doubling high power fiber laser as claimed in claim 1, it is characterised in that in the uptake zone that wavelength is institute's doped with rare-earth elements in described high power pump source, the wavelength of the pumping source used for Yb dosed optical fiber is 900 to 980 nanometers.
4. inner cavity frequency-doubling high power fiber laser as claimed in claim 1, it is characterised in that described optical-fiber bundling device is the pumped fiber based on fused biconical taper technology/signal bundling device.
5. inner cavity frequency-doubling high power fiber laser as claimed in claim 1, it is characterised in that described optical-fiber bundling device includes the bundling device that flashlight and pump light are combined by least one dichroic mirror and two collimating lens.
6. inner cavity frequency-doubling high power fiber laser as claimed in claim 1, it is characterised in that described signal wavelength selector is the narrow linewidth optical filter at desired signal wavelength place.
7. inner cavity frequency-doubling high power fiber laser as claimed in claim 1, it is characterised in that described signal wavelength selector is the reflective Volume Bragg grating to selected wavelength diffractive.
8. inner cavity frequency-doubling high power fiber laser as claimed in claim 1, it is characterised in that described large mode field double clad is protected the core diameter of inclined rare earth doped fiber and is not less than 10 microns.
9. inner cavity frequency-doubling high power fiber laser as claimed in claim 1, it is characterised in that described frequency-doubling crystal is the frequency doubling non-linear's crystal used in the laser of polarizing emission, including three Lithium biborates, potassium titanium oxide phosphate, BBO Crystal.
10. inner cavity frequency-doubling high power fiber laser as claimed in claim 1, it is characterised in that described chamber mirror is least one set completely reflecting mirror.
11. inner cavity frequency-doubling high power fiber laser as claimed in claim 1, it is characterised in that described chamber mirror is at least one completely reflecting mirror and at least one emission-type body grating.
12. inner cavity frequency-doubling high power fiber laser as claimed in claim 1, it is characterised in that the polarization spectroscope consistent with the output polarization of polarization maintaining optical fibre can be placed in described optical fiber laser resonant cavity, it is suppressed that the gain in resonator cavity of the s polarized light.
13. inner cavity frequency-doubling high power fiber laser as claimed in claim 1, it is characterised in that the described polarization spectroscope in optical fiber laser resonant cavity is also as frequency multiplication output device.
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| CN201620153600.6U CN205406951U (en) | 2016-02-29 | 2016-02-29 | High -power fiber laser of inner chamber doubling of frequency |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591268A (en) * | 2016-02-29 | 2016-05-18 | 深圳英诺激光科技有限公司 | Large power fiber laser with inner cavity frequency doubling |
| CN108832469A (en) * | 2018-06-04 | 2018-11-16 | 北京凯普林光电科技股份有限公司 | A kind of high power fiber laser of spectrum beam combination |
| CN110896192A (en) * | 2019-11-13 | 2020-03-20 | 江苏师范大学 | Non-quartz glass-based medium-infrared special fiber Raman DFB fiber laser |
| CN112003120A (en) * | 2020-08-19 | 2020-11-27 | 罗根激光科技（武汉）有限公司 | 532nm continuous light green laser and control method thereof |
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2016
- 2016-02-29 CN CN201620153600.6U patent/CN205406951U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591268A (en) * | 2016-02-29 | 2016-05-18 | 深圳英诺激光科技有限公司 | Large power fiber laser with inner cavity frequency doubling |
| CN108832469A (en) * | 2018-06-04 | 2018-11-16 | 北京凯普林光电科技股份有限公司 | A kind of high power fiber laser of spectrum beam combination |
| CN108832469B (en) * | 2018-06-04 | 2019-11-29 | 北京凯普林光电科技股份有限公司 | A kind of high power fiber laser of spectrum beam combination |
| CN110896192A (en) * | 2019-11-13 | 2020-03-20 | 江苏师范大学 | Non-quartz glass-based medium-infrared special fiber Raman DFB fiber laser |
| CN112003120A (en) * | 2020-08-19 | 2020-11-27 | 罗根激光科技（武汉）有限公司 | 532nm continuous light green laser and control method thereof |
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Address after: 518000 Shenzhen, Nanshan District science and Technology Park, North District, Long Hill Road, No. two, No. 8, Qing Guang photoelectric building, the Office (305) Patentee after: Innovo laser Polytron Technologies Inc Address before: 518000 Shenzhen, Nanshan District science and Technology Park, North District, Long Hill Road, No. two, No. 8, Qing Guang photoelectric building, the Office (305) Patentee before: Shenzhen Inno Laser Technology Co., Ltd. |
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