CN102324686B - Semiconductor laser MOPA (Master Oscillator Power Amplifier) system for pumping alkali metal vapor - Google Patents
Semiconductor laser MOPA (Master Oscillator Power Amplifier) system for pumping alkali metal vapor Download PDFInfo
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- CN102324686B CN102324686B CN2011102578027A CN201110257802A CN102324686B CN 102324686 B CN102324686 B CN 102324686B CN 2011102578027 A CN2011102578027 A CN 2011102578027A CN 201110257802 A CN201110257802 A CN 201110257802A CN 102324686 B CN102324686 B CN 102324686B
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Abstract
The invention discloses a semiconductor laser MOPA (Master Oscillator Power Amplifier) system for pumping alkali metal vapor, wherein a linewidth compression system, a beam shaping and coupling system, a seed optical system and a power amplification system are sequentially connected; a semiconductor laser linewidth compression system which consists of a fast-axis collimation lens, two plano-convex lenses and a holographic grating is used, meanwhile a buffer gas with a determinate optimized pressure value is charged into a master oscillation pool in the seed optical system and an amplification pool in the power amplification system so as to broaden an alkali metal atomic absorption line; and the linewidth of an LDA (Laser Diode Array) can be effectively compressed to the magnitude of that of the broadened alkali metal atomic absorption line so as to realize the matching of the linewidth of the LDA and the alkali metal atomic absorption line. Pump lights are allocated to two gain medium pools, i.e. the master oscillation pool and the amplification pool, according to the proportion of 1: 4, and as the structures of the two oscillation pools are completely identical, the quality of beams is ensured and meanwhile the heat quantity is dispersed, and the power can be amplified over multiple times.
Description
Technical field
The present invention relates to a kind of alkali metal vapour laser, especially relate to a kind of MOPA system of semiconductor pumped alkali metal vapour laser.
Background technology
Semiconductor laser array (LDA) pumping alkali metal vapour laser DPALs (diode-pumped alkali vopor lasers) caused the very big interest of people in recent years and obtained fast-developing new pattern laser device; Have little, the heat management performance advantages of higher of quantum loss, be expected to obtain to have the high-efficiency high power near-infrared laser output of high light beam quality.These near-infrared lasers have wide practical use at aspects such as laser cooling, oriented energy transmission, material processed.Gain media is widely used to be rubidium (Rb) and caesium (Cs).On the one hand; For obtaining high-power alkali metal vapour laser; Need do pumping source with high-power semiconductor laser array, but the pumping source live width is generally than the big 3-4 one magnitude of the alkali metal atom line-width behind the Doppler broadening, the imbalance of both live widths is key factors of restriction pumping efficiency; Therefore; It is the key issue that realizes high-efficiency high power DPALs that the live width that how to make live width and the alkali metal atom of pump light source absorb line is complementary, and two kinds of methods are arranged, and a kind of is that the buffer gas (ethane and helium mix gas) that in the alkali metal vapour pond, charges into higher pressure comes the broadening line-width to more than the 10GHz.Another kind is to utilize live width that the laser frequency-selecting technology effectively compresses the external cavity type diode laser to the 10GHz magnitude.On the other hand; The pump mode of DPALs has horizontal pumping and two kinds of vertical pumpings, all obtained good result experimentally, but this dual mode is when high power pump; All exist owing to radial symmetry gradient makes the inhomogeneous problem of bringing thermal lensing effect of gain media refractive index; Cause the imbalance of power output instability and chamber mould and pump light, influenced beam quality, limited the raising laser power simultaneously.
Summary of the invention
For solving the problem that exists in the background technology; The object of the present invention is to provide a kind of MOPA (Maser Oscillator Power Amplifier) system of semiconductor pumped alkali metal vapour laser; This system combines two kinds of live width matching process, uses the holographic grating frequency-selecting that the LDA live width is compressed to tens to tens GHz, and in the gain media pond, charges into buffer gas broadening alkali metal atom absorption line so far about width; Improve both matching degrees, thereby effectively improve pumping efficiency; Use two gain media ponds simultaneously; One is the main oscillations pond; One the laser that the main oscillations pond produces converges at the second polarizing beam splitter mirror place as the pump light of seed light and 4/5 in order to amplify the pond, together incides and amplifies in the pond; Amplify alkali metal vapour laser output that the pond produces and be exactly the laser that has amplified, can the alkali metal vapour laser power be amplified more than the several times.
The technical solution adopted for the present invention to solve the technical problems is:
The pump light that semiconductor laser array sends through fast axis collimation mirror, first planoconvex spotlight, the first half slides, second planoconvex spotlight after after holographic grating reflexes to first mirror reflects; Be divided into the two-way pump light through post lens, the 3rd planoconvex spotlight, Siping City's convex lens to beam splitter again; Road pump light behind beam splitter is through first convex lens to the first polarizing beam splitter mirror; Arrive high reflective mirror through the main oscillations pond; The light of high reflective mirror reflection is incident to first polarizing beam splitter mirror once more behind the main oscillations pond; Through output coupling mirror to second speculum, the 3rd speculum, the 4th speculum, second half-wave plate, second convex lens to the second polarizing beam splitter mirror; Light is divided into two-way light after amplifying pond, the 3rd polarizing beam splitter mirror, export light to a road of the 3rd polarizing beam splitter mirror and connect power meter for alkali metal vapour laser, and another road output light is residual pump light; Through another road pump light to the three half-wave plates, the 3rd convex lens of beam splitter, overlapping at second polarizing beam splitter mirror and another road light; At the center of each element on the same straight line on same optical axis.
Described semiconductor laser array front end face is coated with anti-anti-film; And its front end is on the focus of first planoconvex spotlight; The first half slides are simultaneously on the focus of first planoconvex spotlight, second planoconvex spotlight; Holographic grating is on the focus of second planoconvex spotlight, and the fast axis collimation mirror is regulated in experiment apart from the distance of semiconductor laser array front end and confirmed, concentrates with the hot spot edge clear brightness behind the collimation to be as the criterion; The distance of the 3rd planoconvex spotlight and post lens is both focal length sums for both focal length sums, the distance of the 3rd planoconvex spotlight and Siping City's convex lens.
Described main oscillations pond is in the focal length of first convex lens.
Described amplification pond is in the focal length of second convex lens.
Described first speculum is parallel with holographic grating, and second speculum is parallel with the 3rd speculum, and the 3rd speculum is vertical with the 4th speculum.
The useful effect that the present invention has is:
The semiconductor laser live width compressibility that use is made up of fast axis collimation mirror, first planoconvex spotlight, second planoconvex spotlight and holographic grating; The buffer gas that in main oscillations pond, amplification pond, charges into the optimization atmospheric pressure value of confirming the research back simultaneously absorbs line with the broadening alkali metal atom; Can the LDA live width effectively be compressed to the magnitude of the alkali metal atom line-width behind the broadening, realize the coupling of both live widths.Pump light being pressed the pro rate of 1:4 gives the main oscillations pond and amplifies two gain media ponds, pond; Because two vibration pool structures are identical, ensured beam quality, disperseed heat simultaneously; And can obtain good result experimentally with more than the power amplification several times.
Description of drawings
Accompanying drawing is an index path of the present invention.
Among the figure: 1, semiconductor laser array, 2, the fast axis collimation mirror, 3, first planoconvex lens, 4, first half-wave plate, 5, second planoconvex lens; 6, holographic grating, 7, first speculum, 8, the post lens, the 9, the 3rd planoconvex lens, 10, Siping City's convex lens; 11, beam splitter, 12, first convex lens, 13, first polarizing beam splitter mirror, 14, the main oscillations pond, 15, temperature control box; 16, high reflective mirror, 17, output coupling mirror, 18, second speculum, the 19, the 3rd speculum, the 20, the 4th speculum; 21, second half-wave plate, 22, second convex lens, 23, second polarizing beam splitter mirror, the 24, the 3rd half-wave plate, the 25, the 3rd convex lens; 26, amplify the pond, 27, temperature control box, the 28, the 3rd polarizing beam splitter mirror, 29, residual pump light output, 30, power meter.
Embodiment
Below in conjunction with accompanying drawing execution mode of the present invention is further specified.
Shown in accompanying drawing; The pump light that semiconductor laser array 1 sends through fast axis collimation mirror 2, first planoconvex spotlight 3, the first half slides 4, second planoconvex spotlight 5 after after holographic grating 6 reflexes to 7 reflections of first speculum; Be divided into the two-way pump light through post lens 8, the 3rd planoconvex spotlight 9, Siping City's convex lens 10 to beam splitter 11 again; Road pump light behind beam splitter 11 is through first convex lens, 12 to first polarizing beam splitter mirrors 13; 14 to high reflective mirror 16 through the main oscillations pond; The light of high reflective mirror reflection is incident to first polarizing beam splitter mirror 13 once more behind main oscillations pond 14, through output coupling mirror 17 to second speculums 18, the 3rd speculum 19, the 4th speculum 20, second half-wave plate 21, second convex lens, 22 to second polarizing beam splitter mirrors 23, light is divided into two-way light after amplifying pond 26, the 3rd polarizing beam splitter mirror 28; Road output light (alkali metal vapour laser) to the 3rd polarizing beam splitter mirror connects power meter 30, and another road output light is residual pump light 29; To another road pump light of beam splitter 11, to the 3rd half-wave plate 24, the 3rd convex lens 25, overlapping with another road light behind beam splitter at second polarizing beam splitter mirror 23; At the center of each element on the same straight line on same optical axis.
The MOPA system of semiconductor pumped alkali metal vapour laser disclosed by the invention comprises semiconductor laser live width compressibility, seed light system, power amplifying system and beam shaping and coupled system, wherein:
1) semiconductor laser live width compressibility: comprise semiconductor laser array 1, fast axis collimation mirror 2, the first planoconvex spotlights 3, second planoconvex spotlight, 5, the first half slides 4, holographic grating 6.Semiconductor laser array 1 front end face is coated with anti-anti-film; And its front end is on the focus of first planoconvex spotlight 3; On the focus of first planoconvex spotlight 3, second planoconvex spotlight 5, holographic grating 6 is on the focus of second planoconvex spotlight 5 simultaneously for the first half slides 4, and fast axis collimation mirror 2 be a millimeter magnitude apart from the distance of semiconductor laser array front end; Particular location can be regulated in test definite, concentrates with the hot spot edge clear brightness behind the collimation to be as the criterion; The distance of the 3rd planoconvex spotlight 9 and post lens 8 is both focal length sums, and the distance of the 3rd planoconvex spotlight 9 and Siping City's convex lens 10 is both focal length sums.
2) seed light system: comprise first convex lens, 12, the first polarizing beam splitter mirrors 13, main oscillations pond 14, temperature control box 15, high reflective mirror 16, output coupling mirror 17.System is " L " type layout, and main oscillations pond 14 is in the focal length of first convex lens 12.Main oscillations pond 14 is put in the temperature control box 15.
3) power amplifying system: comprise second half-wave plate, 21, the second convex lens, 22, the second polarizing beam splitter mirrors 23, amplify pond 26, temperature control box 27, the 3rd polarizing beam splitter mirror 28, power meter 30, the three half-wave plates 24, the 3rd convex lens 25.Amplifying pond 26 is put in the temperature control box 27.Amplify pond 26 in the focal length of second convex lens 22.
4) beam shaping and coupled system: comprise four total reflective mirrors 7,18,19,20, post lens 8, the three planoconvex spotlights 9, the Siping City's convex lens 10, beam splitter 11.First speculum 7 is parallel with holographic grating 6, and second speculum 18 is parallel with the 3rd speculum 19, and the 3rd speculum 19 is vertical with the 4th speculum 20.
Semiconductor laser live width compressibility: the fast axis collimation mirror is pressed close to the LDA front end place,, accomplish efficiently to utilize pump light with the light that collimation fast axle has promptly been dispersed along optical axis direction; The telescopic system multiplication factor is f
2/ f
1(f wherein
1, f
2Be respectively the focal length of first planoconvex spotlight, second planoconvex spotlight, this multiplication factor that the present invention uses is about 4 times), be used for extensible beam and LDA imaged in holographic grating, for reducing aberration, two lens of telescopic system use planoconvex lens; The first half slides can be regulated feedback, come the excessive damage of anti-feedback power LDA; Through regulating the angle and the gradient of holographic grating, select the centre wavelength of needs, mask its all band, thereby greatly reduce the live width of LDA.Through the angle and the gradient of adjustment holographic grating, make pump light maximum at the central wavelength power of needs, this can record through spectrometer; Rotate half slide then, make pump light that suitable feedback arranged, be about 30% of LDA power.
Pump beam after the live width compression is through the first speculum output parallel with holographic grating; Because the pump light variation aspect collimation and spatial symmetry after the live width compression; So need its shaping, the post lens play collimating effect, the telescopic system that the 3rd planoconvex spotlight, Siping City's convex lens are formed can be converted into the size bigger slightly than main oscillations pond with beam sizes; Thereby make pump light cover main oscillations Chi Chi, further improve pumping efficiency.Get into the beam shaping system, through the adjusting to beam sizes of the collimation and the 3rd of post lens, Siping City's convex lens, pump light is respectively applied for the pumping of amplifying pond and main oscillations pond through the light beam beam splitter in the ratio of power 4:1.
The seed light system: 1/5 pump light is used for pumping main oscillations pond, is about the focusing of first convex lens of 20cm through focal length, crosses first polarizing beam splitter mirror, to the center in main oscillations pond.The main oscillations pond is put in the temperature control box, is filled with gain media in the pond, simultaneously certain buffer gas of optimizing atmospheric pressure value comes the broadening alkali metal atom to absorb line, with the LDA live width coupling of having compressed, thereby realize pumping efficiently.Atomic density in the steam pond is controlled through the temperature of temperature control box, regulates temperature control box, makes vibration pond, pond window temperature higher 5 ℃ than pond temperature, and temperature control is floated and is controlled at 0.1 ℃.Behind the pump light process main oscillations pond; Obtain alkali metal vapour laser, use reflectivity to be about 99.5% high reflective mirror the main oscillations pond is gone back in alkali metal vapour laser-bounce, the laser that polarizing beam splitter mirror is exported pump light and main oscillations pond separates; Because both polarized orthogonals; After alkali metal vapour laser separates with pump light, be the output of 20% output coupling mirror, export this part alkali metal vapour laser and will after coupling, be incident to as seed light and amplify the pond through reflectivity.
Alkali metal vapour laser through output coupling mirror output carries out the adjusting of beam direction through second speculum, the 3rd speculum, the 4th speculum, the ingoing power amplification system.
Power amplifying system: other 4/5 pump light incides the center of amplifying the pond through second polarizing beam splitter mirror after with the 3rd convex lens focus, amplifies the structure in pond and controls with the main oscillations pond with temperature.Seed light incides the center of amplifying the pond through second polarizing beam splitter mirror after second convex lens focus.Rotate second half-wave plate, the 3rd half-wave plate, the incident power that can regulate light beam.Seed light and pump light are overlapping to amplify efficient to improve in order better to make, and amplifies the pond in the focus of second convex lens, moves the position of second convex lens and measures power output simultaneously, and the position of second convex lens was exactly its optimum position when power output was maximum.Amplify output light and remaining pump light after the 3rd polarizing beam splitter mirror behind the pond is used for separating amplification, the alkali metal vapour laser coupled after the amplification is advanced power meter, and residual pump light is exported.
Claims (5)
1. semiconductor pumped alkali metal vapour laser MOPA system; It is characterized in that: the pump light that semiconductor laser array (1) sends through fast axis collimation mirror (2), first planoconvex spotlight (3), the first half slides (4), second planoconvex spotlight (5) after after holographic grating (6) reflexes to first speculum (7) reflection; Be divided into the two-way pump light through post lens (8), the 3rd planoconvex spotlight (9), Siping City's convex lens (10) to beam splitter (11) again; Road pump light warp first convex lens (12) behind beam splitter (11) are to first polarizing beam splitter mirror (13); Arrive high reflective mirror (16) through main oscillations pond (14); The light of high reflective mirror reflection is incident to first polarizing beam splitter mirror (13) once more after main oscillations pond (14); Through output coupling mirror (17) to second speculum (18), the 3rd speculum (19), the 4th speculum (20), second half-wave plate (21), second convex lens (22) to second polarizing beam splitter mirror (23); Light is divided into two-way light through amplification pond (26), the 3rd polarizing beam splitter mirror after (28), and one tunnel output light connects power meter (30) for alkali metal vapour laser, and another road output light is residual pump light (29); Through another road pump light to the three half-wave plates (24), the 3rd convex lens (25) of beam splitter (11), overlapping at second polarizing beam splitter mirror (23) and another road light; At the center of each element on the same straight line on same optical axis.
2. a kind of semiconductor pumped alkali metal vapour laser MOPA according to claim 1 system; It is characterized in that: described semiconductor laser array (1) front end face is coated with anti-anti-film; And its front end is on the focus of first planoconvex spotlight (3); The first half slides (4) are simultaneously on the focus of first planoconvex spotlight (3), second planoconvex spotlight (5); Holographic grating (6) is on the focus of second planoconvex spotlight (5), and fast axis collimation mirror (2) is regulated in experiment apart from the distance of semiconductor laser array front end and confirmed, concentrates with the hot spot edge clear brightness behind the collimation to be as the criterion; The distance of the 3rd planoconvex spotlight (9) and post lens (8) is both focal length sums for both focal length sums, the distance of the 3rd planoconvex spotlight (9) and Siping City's convex lens (10).
3. a kind of semiconductor pumped alkali metal vapour laser MOPA according to claim 1 system, it is characterized in that: described main oscillations pond (14) is in the focal length of first convex lens (12).
4. a kind of semiconductor pumped alkali metal vapour laser MOPA according to claim 1 system, it is characterized in that: described amplification pond (26) is in the focal length of second convex lens (22).
5. a kind of semiconductor pumped alkali metal vapour laser MOPA according to claim 1 system; It is characterized in that: described first speculum (7) is parallel with holographic grating (6); Second speculum (18) is parallel with the 3rd speculum (19), and the 3rd speculum (19) is vertical with the 4th speculum (20).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103036139A (en) * | 2012-12-17 | 2013-04-10 | 浙江大学 | Narrow-linewidth tunable semiconductor longitudinal single-ended pump rubidium steam laser optical path system |
| CN104779518A (en) * | 2015-03-14 | 2015-07-15 | 浙江大学 | Lateral multi-end symmetry pumped alkali vapor laser MOPA (master oscillator power amplifier) system |
| CN104976953B (en) * | 2015-06-26 | 2018-06-12 | 吉林大学 | Laser focuses on deviation detection device |
| KR101936120B1 (en) * | 2016-11-30 | 2019-01-08 | 부경대학교 산학협력단 | Probe for Photoacoustic Tomography and Real-time Photoacoustic Tomography Apparatus having the same |
| CN109309336B (en) * | 2017-07-28 | 2020-11-03 | 中国科学院大连化学物理研究所 | Excimer broadband pumping alkali metal blue laser |
| CN108039641A (en) * | 2017-11-07 | 2018-05-15 | 西南技术物理研究所 | A kind of alkali metal vapour laser of dual wavelength double modulation |
| CN108039642A (en) * | 2017-11-07 | 2018-05-15 | 西南技术物理研究所 | A kind of continuous output alkali metal steam laser of dual wavelength |
| CN107800037A (en) * | 2017-11-07 | 2018-03-13 | 西南技术物理研究所 | A kind of three wavelength alkali metal vapour lasers |
Citations (3)
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| CN2475197Y (en) * | 2001-02-20 | 2002-01-30 | 浙江大学 | Metal vapour laser discharging tube |
| CN101237114A (en) * | 2008-01-21 | 2008-08-06 | 浙江大学 | Electrophoresis pulse metal steam laser system |
| CN201160193Y (en) * | 2008-01-21 | 2008-12-03 | 浙江大学 | Electrophoresis impulse metal vapour laser arrangement |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7620092B2 (en) * | 2006-06-06 | 2009-11-17 | Coherent, Inc. | Multimode MOPA with thermal lens compensation |
| CN202268596U (en) * | 2011-09-02 | 2012-06-06 | 浙江大学 | MOPA (master oscillator power amplifier) system for semi-conductor diode-pumped alkali metal vapor lasers |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2475197Y (en) * | 2001-02-20 | 2002-01-30 | 浙江大学 | Metal vapour laser discharging tube |
| CN101237114A (en) * | 2008-01-21 | 2008-08-06 | 浙江大学 | Electrophoresis pulse metal steam laser system |
| CN201160193Y (en) * | 2008-01-21 | 2008-12-03 | 浙江大学 | Electrophoresis impulse metal vapour laser arrangement |
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