CN104158083A - Single-doped Ho:YAG tunable single longitudinal mode laser on basis of torsional mode technology - Google Patents
Single-doped Ho:YAG tunable single longitudinal mode laser on basis of torsional mode technology Download PDFInfo
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- CN104158083A CN104158083A CN201410457753.5A CN201410457753A CN104158083A CN 104158083 A CN104158083 A CN 104158083A CN 201410457753 A CN201410457753 A CN 201410457753A CN 104158083 A CN104158083 A CN 104158083A
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Abstract
The invention discloses a single-doped Ho:YAG tunable single longitudinal mode laser on the basis of a torsional mode technology, relates to the technical field of a single longitudinal mode laser, and aims to improve high-efficiency, high-power and tunable continuous single longitudinal mode 2mum laser output. The single-doped Ho:YAG tunable single longitudinal mode laser on the basis of the torsional mode technology comprises a Tm:YLF laser, a pumping optical coupling system and a laser oscillator; the Tm:YLF laser emits Tm:YLF pumping light with a wavelength of 1,908nm; the pumping light enters the pumping optical coupling system; the pumping optical coupling system couples the pumping light and then the pumping light enters the laser oscillator; after forming laser oscillation, the laser oscillator outputs single longitudinal mode laser. The single-doped Ho:YAG tunable single longitudinal mode laser is suitable to generate the continuous single longitudinal mode 2mum laser output.
Description
Technical field
The present invention relates to single longitudinal mode laser field.
Background technology
The features such as coherence is good owing to having, line width, frequency stabilization, single longitudinal mode laser is widely used in the fields such as optics frequency marking, meticulous spectral measurement, coherent communication, laser radar.And the weak absorption band of 2 mu m waveband lasers in human eye safe waveband and atmosphere, therefore 2 mu m waveband single longitudinal mode lasers demonstrate application prospect more and more widely at numerous areas such as military affairs, medical treatment, scientific researches.At present, the main technical schemes of acquisition single longitudinal mode laser output comprises: short cavity method, F-P Method of Etalon, unidirectional loop chamber method, coupling cavity method, torsion modulus method.Wherein, reversing modeling method can coordinate F-P etalon to realize the tuning of single longitudinal mode laser when obtaining higher single longitudinal mode laser power, is to obtain continuous single longitudinal mode laser to export desirable technical scheme.The Tm of laser diode pump-coupling, Ho mixes altogether laser and singly mixes Tm laser is to obtain at present the Major Technology of 2 mu m waveband lasers.Although singly mix Tm laser compact conformation, single Tm-doped crystal emission cross section is little, thermal effect is serious, thereby cause singly mixing, Tm laser gain is less, efficiency is lower, thermal stability is poor.Tm, Ho mixes laser altogether population population under normal temperature condition in laser lower level, and interionic energy shifts and causes on Ho ion conversion and reabsorption loss very large, causes Tm, and power output and efficiency that Ho mixes laser are altogether subject to great restriction.In order to obtain high power and high efficiency 2 μ m laser need to be abandoned the impact of sensitization particle on 2 μ m lasers under normal temperature condition, the impact of conversion and reabsorption loss in elimination.Therefore, adopt and singly to mix Tm laser pump-coupling list to mix Ho crystal be under normal temperature condition, to obtain the desirable technological approaches of high efficiency 2 μ m Laser output.Use 1.9 μ m laser as pumping source, the Ho laser of singly mixing that operates at 2 mu m wavebands belongs to accurate two energy level laser systems, and it is insensitive to working temperature, thermal lensing effect a little less than; Quantum loss is little, can obtain higher laser gain; There is not Tm
3+with Ho
3+between relaxation process, upper transition effects is little.
Summary of the invention
The present invention proposes and a kind ofly based on what reverse mould technology, singly mix Ho:YAG tunable single longitudinal mode laser, object is to realize high efficiency, high power, tunable continuous single longitudinal mode 2 μ m Laser outputs.
The Ho:YAG tunable single longitudinal mode laser of singly mixing based on reversing mould technology comprises Tm:YLF laser, pump light coupled system and laser oscillator, Tm:YLF laser is launched the Tm:YLF pump light that wavelength is 1908nm, this pump light is incident to pump light coupled system, pump light coupled system is incident to laser oscillator after pump light is coupled, and laser oscillator is exported single longitudinal mode laser after forming laser generation.
Pump light coupled system comprises the first transform lens and the second transform lens, and Tm:YLF laser is launched pump light and after the first transform lens and the second transform lens, is incident to laser oscillator successively.
Laser oscillator comprises input mirror, the first quarter-wave plate, Ho:YAG crystal, the second quarter-wave plate, polarizing component, wavelength tuning element and output coupling mirror, described input mirror and output coupling mirror form laser resonant cavity, the pump light that pump light coupled system is launched is incident to Ho:YAG crystal through input mirror, the emergent light of Ho:YAG crystal is incident to polarizing component, polarizing component is incident to wavelength tuning element after changing this emergent light into linearly polarized light, linearly polarized light is incident to output coupling mirror through wavelength tuning element, before Ho:YAG crystal, coaxially add afterwards the first quarter-wave plate and the second quarter-wave plate, output coupling mirror reflexes to the second quarter-wave plate by this linearly polarized light through polarizing component and wavelength tuning componentry, the second quarter-wave plate is incident to Ho:YAG crystal after changing linearly polarized light into left circularly polarized light, the emergent light of Ho:YAG crystal is incident to the first quarter-wave plate, the first quarter-wave plate is incident to input mirror after changing this emergent light into linearly polarized light, input mirror is reflected back the first quarter-wave plate by this linearly polarized light, the first quarter-wave plate is incident to Ho:YAG crystal after changing linearly polarized light into right-circularly polarized light, the emergent light of Ho:YAG crystal changes linearly polarized light into through the second quarter-wave plate and polarizing component, this linearly polarized light after wavelength tuning element by the transmission of output coupling mirror part, the linearly polarized light of output coupling mirror part transmission is single longitudinal mode laser.
Beneficial effect: the present invention selects Ho:YAG crystal as laser working medium, utilize two quarter-wave plates, adopt and reverse mould technology elimination Ho:YAG laser effects of spatial, thereby obtain high power, high efficiency 2 μ m single longitudinal mode lasers, and utilize F-P etalon to realize the tunable laser output of Ho:YAG single longitudinal mode laser, for the applications such as meticulous spectral measurement and laser radar provide a kind of LASER Light Source of function admirable.
Accompanying drawing explanation
Fig. 1 is the principle schematic of singly mixing Ho:YAG tunable single longitudinal mode laser based on reversing mould technology.
Embodiment
Embodiment one, in conjunction with Fig. 1, this embodiment is described, the Ho:YAG tunable single longitudinal mode laser of singly mixing based on reversing mould technology described in this embodiment comprises Tm:YLF laser, pump light coupled system and laser oscillator, Tm:YLF laser is launched the Tm:YLF pump light that wavelength is 1908nm, this pump light is incident to pump light coupled system, pump light coupled system is incident to laser oscillator after pump light is coupled, and laser oscillator is exported single longitudinal mode laser after forming laser generation.
Embodiment two, in conjunction with Fig. 1, this embodiment is described, this embodiment is with the difference of singly mixing Ho:YAG tunable single longitudinal mode laser based on reversing mould technology described in embodiment one, pump light coupled system comprises the first transform lens 8 and the second transform lens 9, and Tm:YLF laser is launched pump light and after the first transform lens 8 and the second transform lens 9, is incident to laser oscillator successively.
The difference of singly mixing Ho:YAG tunable single longitudinal mode laser based on reversing mould technology described in embodiment three, this embodiment and embodiment two is, the outer surface of described the first transform lens 8 and the second transform lens 9 is all coated with pump light high transmittance film.
Embodiment four, in conjunction with Fig. 1, this embodiment is described, this embodiment is with the difference of singly mixing Ho:YAG tunable single longitudinal mode laser based on reversing mould technology described in embodiment two, described laser oscillator comprises input mirror 1, the first quarter-wave plate 2, Ho:YAG crystal 3, the second quarter-wave plate 4, polarizing component 5, wavelength tuning element 6 and output coupling mirror 7, described input mirror 1 and output coupling mirror 7 form laser resonant cavity, the pump light that pump light coupled system is launched is incident to Ho:YAG crystal 3 through input mirror 1, the emergent light of Ho:YAG crystal 3 is incident to polarizing component 5, polarizing component 5 is incident to wavelength tuning element 6 after changing this emergent light into linearly polarized light, linearly polarized light is incident to output coupling mirror 7 through wavelength tuning element 6, before Ho:YAG crystal 3, coaxially add afterwards the first quarter-wave plate 2 and the second quarter-wave plate 4, output coupling mirror 7 reflexes to the second quarter-wave plate 4 by this linearly polarized light through polarizing component 5 and wavelength tuning element 6 parts, the second quarter-wave plate 4 is incident to Ho:YAG crystal 3 after changing linearly polarized light into left circularly polarized light, the emergent light of Ho:YAG crystal 3 is incident to the first quarter-wave plate 2, the first quarter-wave plate 2 is incident to input mirror 1 after changing this emergent light into linearly polarized light, input mirror 1 is reflected back the first quarter-wave plate 2 by this linearly polarized light, the first quarter-wave plate 2 is incident to Ho:YAG crystal 3 after changing linearly polarized light into right-circularly polarized light, the emergent light of Ho:YAG crystal 3 changes linearly polarized light into through the second quarter-wave plate 4 and polarizing component 5, this linearly polarized light after wavelength tuning element 6 by output coupling mirror 7 part transmissions, the linearly polarized light of output coupling mirror 7 part transmissions is single longitudinal mode laser.
In present embodiment, the direction of rotation of the circularly polarized light penetrating due to two quarter-wave plates is different, therefore, when left circularly polarized light and right-circularly polarized light meet in Ho:YAG crystal 3, between them, exist the phase difference of π/4, make to form in Ho:YAG crystal 3 uniform Energy distribution, thereby eliminate the impact of laser effects of spatial, finally realize single longitudinal mode laser output; When the pump power of Tm:YLF laser is 15W, can obtain peak power is the continuous lines polarization single longitudinal mode 2 μ m laser of 1W.
By changing the angle of wavelength tuning element 6, reach the object that changes laser resonant cavity loss, realize the tuning of Ho:YAG single longitudinal mode laser.
The length of laser resonant cavity is 160mm-180mm.
The difference of singly mixing Ho:YAG tunable single longitudinal mode laser based on reversing mould technology described in embodiment five, this embodiment and embodiment four is, described input mirror 1 surface is coated with the thoroughly high and oscillation light high-reflecting film of pump light.
The difference of singly mixing Ho:YAG tunable single longitudinal mode laser based on reversing mould technology described in embodiment six, this embodiment and embodiment four is, the first quarter-wave surface, the second quarter-wave surface and Ho:YAG crystal 3 two ends are all coated with pump light and oscillation light high transmittance film.
The difference of singly mixing Ho:YAG tunable single longitudinal mode laser based on reversing mould technology described in embodiment seven, this embodiment and embodiment four is, the deielectric-coating that the surface of output coupling mirror 7 is coated with pump light height thoroughly and oscillation light transmissivity is 2%.
The difference of singly mixing Ho:YAG tunable single longitudinal mode laser based on reversing mould technology described in embodiment eight, this embodiment and embodiment four or seven is, the plano-concave mirror that output coupling mirror 7 is 200mm for radius of curvature.
The difference of singly mixing Ho:YAG tunable single longitudinal mode laser based on reversing mould technology described in embodiment nine, this embodiment and embodiment four is, the thick F-P etalon realization of polarizing component 5 employing 0.5mm.
The difference of singly mixing Ho:YAG tunable single longitudinal mode laser based on reversing mould technology described in embodiment ten, this embodiment and embodiment four is, the thick F-P etalon realization of wavelength tuning element 6 employing 1mm.
Claims (10)
1. based on what reverse mould technology, singly mix Ho:YAG tunable single longitudinal mode laser, it is characterized in that, it comprises Tm:YLF laser, pump light coupled system and laser oscillator, Tm:YLF laser is launched the Tm:YLF pump light that wavelength is 1908nm, this pump light is incident to pump light coupled system, pump light coupled system is incident to laser oscillator after pump light is coupled, and laser oscillator is exported single longitudinal mode laser after forming laser generation.
2. according to claim 1ly based on what reverse mould technology, singly mix Ho:YAG tunable single longitudinal mode laser, it is characterized in that, pump light coupled system comprises the first transform lens (8) and the second transform lens (9), and Tm:YLF laser is launched pump light and after the first transform lens (8) and the second transform lens (9), is incident to laser oscillator successively.
3. according to claim 2ly based on what reverse mould technology, singly mix Ho:YAG tunable single longitudinal mode laser, it is characterized in that, the outer surface of described the first transform lens (8) and the second transform lens (9) is all coated with pump light high transmittance film.
4. according to claim 2ly based on what reverse mould technology, singly mix Ho:YAG tunable single longitudinal mode laser, it is characterized in that, described laser oscillator comprises input mirror (1), the first quarter-wave plate (2), Ho:YAG crystal (3), the second quarter-wave plate (4), polarizing component (5), wavelength tuning element (6) and output coupling mirror (7), described input mirror (1) and output coupling mirror (7) form laser resonant cavity, the pump light that pump light coupled system is launched is incident to Ho:YAG crystal (3) through input mirror (1), the emergent light of Ho:YAG crystal (3) is incident to polarizing component (5), polarizing component (5) is incident to wavelength tuning element (6) after changing this emergent light into linearly polarized light, linearly polarized light is incident to output coupling mirror (7) through wavelength tuning element (6), before Ho:YAG crystal (3), coaxially add afterwards the first quarter-wave plate (2) and the second quarter-wave plate (4), output coupling mirror (7) reflexes to the second quarter-wave plate (4) by this linearly polarized light through polarizing component (5) and wavelength tuning element (6) part, the second quarter-wave plate (4) is incident to Ho:YAG crystal (3) after changing linearly polarized light into left circularly polarized light, the emergent light of Ho:YAG crystal (3) is incident to the first quarter-wave plate (2), the first quarter-wave plate (2) is incident to input mirror (1) after changing this emergent light into linearly polarized light, input mirror (1) is reflected back the first quarter-wave plate (2) by this linearly polarized light, the first quarter-wave plate (2) is incident to Ho:YAG crystal (3) after changing linearly polarized light into right-circularly polarized light, the emergent light of Ho:YAG crystal (3) changes linearly polarized light into through the second quarter-wave plate (4) and polarizing component (5), this linearly polarized light after wavelength tuning element (6) by output coupling mirror (7) part transmission, the linearly polarized light of output coupling mirror (7) part transmission is single longitudinal mode laser.
5. according to claim 4ly based on what reverse mould technology, singly mix Ho:YAG tunable single longitudinal mode laser, it is characterized in that, described input mirror (1) surface is coated with the thoroughly high and oscillation light high-reflecting film of pump light.
6. according to claim 4ly based on what reverse mould technology, singly mix Ho:YAG tunable single longitudinal mode laser, it is characterized in that, the first quarter-wave surface, the second quarter-wave surface and Ho:YAG crystal (3) two ends are all coated with pump light and oscillation light high transmittance film.
7. according to claim 4ly based on what reverse mould technology, singly mix Ho:YAG tunable single longitudinal mode laser, it is characterized in that, the surface of output coupling mirror (7) is coated with the deielectric-coating that pump light is thoroughly high and oscillation light transmissivity is 2%.
8. according to singly mixing Ho:YAG tunable single longitudinal mode laser based on what reverse mould technology described in claim 4 or 7, it is characterized in that the plano-concave mirror that output coupling mirror (7) is 200mm for radius of curvature.
9. according to claim 4ly based on what reverse mould technology, singly mix Ho:YAG tunable single longitudinal mode laser, it is characterized in that, polarizing component (5) adopts the thick F-P etalon of 0.5mm to realize.
10. according to claim 4ly based on what reverse mould technology, singly mix Ho:YAG tunable single longitudinal mode laser, it is characterized in that, wavelength tuning element (6) adopts the thick F-P etalon of 1mm to realize.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1645691A (en) * | 2005-02-02 | 2005-07-27 | 中国科学院物理研究所 | Active and passive Q-adjusted single longitudinal mode laser |
| CN101304153A (en) * | 2008-06-20 | 2008-11-12 | 福州高意通讯有限公司 | Single longitudinal mode multiple frequency laser for wide operating range semiconductor pump |
| CN101330193A (en) * | 2008-07-29 | 2008-12-24 | 福州高意通讯有限公司 | Single longitudinal mode laser |
| US20100074280A1 (en) * | 2008-09-25 | 2010-03-25 | Yingjun Ma | Single-longitudinal mode laser with orthogonal-polarization traveling-wave mode |
| CN103500920A (en) * | 2013-10-14 | 2014-01-08 | 哈尔滨工业大学 | Pulse single-frequency operating 2.09 micron solid laser |
-
2014
- 2014-09-10 CN CN201410457753.5A patent/CN104158083A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1645691A (en) * | 2005-02-02 | 2005-07-27 | 中国科学院物理研究所 | Active and passive Q-adjusted single longitudinal mode laser |
| CN101304153A (en) * | 2008-06-20 | 2008-11-12 | 福州高意通讯有限公司 | Single longitudinal mode multiple frequency laser for wide operating range semiconductor pump |
| CN101330193A (en) * | 2008-07-29 | 2008-12-24 | 福州高意通讯有限公司 | Single longitudinal mode laser |
| US20100074280A1 (en) * | 2008-09-25 | 2010-03-25 | Yingjun Ma | Single-longitudinal mode laser with orthogonal-polarization traveling-wave mode |
| CN103500920A (en) * | 2013-10-14 | 2014-01-08 | 哈尔滨工业大学 | Pulse single-frequency operating 2.09 micron solid laser |
Non-Patent Citations (1)
| Title |
|---|
| 何新东: "千赫兹Ho:YAG激光器性能优化研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
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