CN103022879A - All solid-state sum frequency sodium beacon laser - Google Patents
All solid-state sum frequency sodium beacon laser Download PDFInfo
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- CN103022879A CN103022879A CN2012105583286A CN201210558328A CN103022879A CN 103022879 A CN103022879 A CN 103022879A CN 2012105583286 A CN2012105583286 A CN 2012105583286A CN 201210558328 A CN201210558328 A CN 201210558328A CN 103022879 A CN103022879 A CN 103022879A
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Abstract
The invention discloses an all solid-state sum frequency sodium beacon laser. The laser is a sodium beacon laser, which is produced on the basis of the sum frequency of a single-longitudinal mode 1064 nm laser and a multiple-longitudinal mode 1319 nm laser. The single-longitudinal mode 1064 nm laser and the multiple-longitudinal mode 1319 nm laser in the laser generate sodium beacon laser respectively by shaping beams of a lens assembly, combining spacial beams through a spectroscope, focusing passing nonlinear crystals by means of a positive lens and summing the frequency. The central wavelength of the sodium beacon laser is controlled by the single-longitudinal mode 1064 nm laser, and the line width of the sodium beacon laser is controlled by the multiple longitudinal-mode 1319 nm laser. According to the all solid-state sum frequency sodium beacon laser, the central wavelength and the line width are controlled respectively on the two lasers, the line width in the range of between 0.1 GHz and 1.0 GHz is easy to adjust and acquire, and the complexity of the laser is reduced. The all solid-state sum frequency sodium beacon laser is simple, stable and reliable in structure, and is an effective solving way that the sodium beacon laser excites sodium atoms to acquire high-strength and high-efficiency resonance scattering atom light echo.
Description
Technical field
The invention belongs to all solid state laser field, be specifically related to a kind of all solid state and frequency sodium beacon laser device, all solid state sodium beacon laser device that is based on single longitudinal mode laser and multilongitudianl-mode laser and frequently produces.Be used for the artificial sodium guiding of astronomical ADAPTIVE OPTICS SYSTEMS back-ray detection, atmosphere wavefront measurement and correction.
Background technology
When 589.159 nm Ear Mucosa Treated by He Ne Laser Irradiations during apart from the atmosphere centre circle sodium layer of ground level 90km ~ 100 km, will produce stronger backward resonance scattering light echo, it can provide Guide Star for ADAPTIVE OPTICS SYSTEMS---the sodium beacon.Based on 1064nm and the 1319nm two all solid state near-infrared lasers of bundle and frequency, be the effective way that produces sodium beacon laser device, the type laser is referred to as all solid state and frequency sodium beacon laser device.In order to make all solid state and frequency sodium beacon laser device centre wavelength and live width and the strongest Absorption Line D of sodium layer atom
2aLine coupling, thereby the resonance light echo efficient of raising atmosphere sodium atom, accurately centre wavelength and the live width of control 1064nm and 1319nm two bundle basic frequency lasers.
Existing all solid state and frequently sodium beacon laser device the way of production mainly contain two kinds of forms: 1) two single longitudinal mode lasers and frequently: 1064nm restraints near-infrared lasers with 1319nm two and is single longitudinal mode, the sodium beacon laser that obtains is single longitudinal mode, and live width is usually less than 10MHz; 2) two Multi-Longitudinal Mode lasers and frequently: 1064nm is many longitudinal modes with 1319nm two bundle near-infrared lasers, and the sodium beacon laser that obtains is many longitudinal modes, and live width equals two and restraints near-infrared laser live width sums, usually in 1GHz ~ 3GHz scope.
These two kinds of the way of productions all come with some shortcomings and limitation: the live width that first kind of way obtains is too small, for high-energy or high-average power sodium beacon laser device system, very easily causes the absorption saturation effect of atmosphere sodium atom; The live width that the second way obtains is larger, has reduced the light echo efficient of atmosphere sodium atom, needs simultaneously exact matching control longitudinal mode near infrared laser more than two longitudinal mode number, and technical difficulty is large, system is complicated.
Summary of the invention
In order to overcome the deficiency that all solid state sodium beacon laser device live width control interval is narrow in the prior art, control device is complicated, the invention provides a kind of all solid state and frequency sodium beacon laser device.
A kind of all solid state and frequency sodium beacon laser device of the present invention, be characterized in, described laser comprises single longitudinal mode 1064nm laser, first lens, the second lens, the 3rd lens, the 4th lens, many longitudinal modes 1319nm laser, 45 degree total reflective mirrors, 45 degree spectroscopes, contracting bundle lens and frequency crystal, a 589nm spectroscope, absorption cell and the 2nd 589nm spectroscope; First lens, the second lens, 45 degree total reflective mirrors are successively set on the single longitudinal mode 1064nm laser transmission light path, first lens is parallel with single longitudinal mode 1064nm laser optical axis with the second lens centre axle, and 45 degree total reflective mirror minute surfaces and single longitudinal mode 1064nm laser optical axis are in angle of 45 degrees; Many longitudinal modes 1319nm laser optical axis arranges parallel with the single longitudinal mode laser optical axis, the 3rd lens, the 4th lens, 45 degree spectroscopes are successively set on many longitudinal modes 1319nm laser transmission light path, the 3rd lens are parallel with many longitudinal modes 1319nm laser optical axis with the 4th lens centre axle, 45 degree spectroscopes and many longitudinal modes 1319nm laser optical axis in angle of 45 degrees, 45 spend spectroscopical minute surface center is arranged on single longitudinal mode 1064nm laser reflection optical axis and many longitudinal modes 1319nm laser optical axis joining; Contracting bundle lens and frequency crystal, a 589nm spectroscope, absorption cell are successively set on the transmission of many longitudinal modes 1319nm laser by on the spectroscopical transmission light path of 45 degree, be arranged at one times of focal length place of contracting bundle lens with the frequency crystal, the optical axis of the one 589nm spectroscope minute surface and Multi-Longitudinal Mode laser in angle of 45 degrees, the 2nd 589nm spectroscope is arranged on the spectroscopical reflected light path of a 589nm, and the angle of minute surface and reflection optical axis is 45 degree.
Described single longitudinal mode 1064nm laser is diode pumping full-solid 1064nm laser, and the vacuum central wavelength is 1064.500nm to 1064.700nm, and live width is 1kHz ~ 10MHz, and working system both can be non-individual body system, also can be the pulse system.
Described many longitudinal modes 1319nm laser is diode pumping full-solid 1319nm laser, the vacuum central wavelength is 1319.082nm to 1319.389nm, live width is 0.1GHz ~ 1GHz, working system is identical with the 1064nm laser, and its centre frequency equals the poor of sodium beacon laser centre frequency and 1064nm laser center frequency.
Described 45 degree total reflective mirrors are level crossing, material selection optical glass or optical crystal, and the surface is coated with 45 degree high-reflecting films, reflectivity R 〉=99.5% to single longitudinal mode 1064nm laser.
Described 45 degree spectroscopes are level crossing, material selection optical glass or optical crystal, and the surface is coated with the double-colored spectro-film of 45 degree, high anti-to a branch of single longitudinal mode 1064nm laser, reflectivity R 〉=99.5% is restrainted many longitudinal modes 1319nm laser to another anti-reflection, transmitance T 〉=98%.
Described first lens, the second lens, the 3rd lens, the 4th lens are lens of the same type, and diameter is 10mm ~ 50mm, focal length 100mm ~ 600mm when being positive lens, and focal length-100mm when being negative lens ~-500mm.
Described contracting bundle lens are positive lens, and diameter is 10mm ~ 50mm, and focal length is 5 times ~ 20 times of diameter.
Described and frequency crystal is I class noncritical phase matching lbo crystal or II class phase matched ktp crystal, and when adopting lbo crystal, length is 20mm ~ 80mm, and single longitudinal mode 1064nm laser and many longitudinal modes 1319nm laser are the linearly polarized light that polarization axle is parallel to each other; When adopting ktp crystal, length is 5mm ~ 20mm, and single longitudinal mode 1064nm laser and many longitudinal modes 1319nm laser are the orthogonal linearly polarized light of polarization axle.
A described 589nm spectroscope, the 2nd 589nm spectroscope are level crossing, material selection optical glass or optical crystal, and the surface is coated with 45 degree, three look spectro-films, high anti-to 589nm laser, reflectivity R 〉=99.5%, anti-reflection to 1064nm, 1319nm two bundle near-infrared lasers, transmitance T 〉=95%.
Described absorption cell material is the metals such as copper commonly used, iron, aluminium, has stronger resisting laser damage ability and thermal capacitance and receives ability, and its effect is single longitudinal mode 1064nm laser and many longitudinal modes 1319nm laser of consume residual.
A kind of all solid state and frequency sodium beacon laser device of the present invention, the sodium beacon laser device that is based on single longitudinal mode laser and multilongitudianl-mode laser and frequently produces, scioptics group (first lens and the second lens, the 3rd lens and the 4th lens) is carried out the space propagation and transformation to two bundle near-infrared lasers, make the two spot size and the angle of divergence basically identical, and by 45 degree total reflective mirrors, 45 degree spectroscopes with two bundle near-infrared laser spaces and bundle, make that the two hot spot is overlapping, coaxial transmission.The two bundle near-infrared lasers of contracting bundle lens after with space and bundle focus on, and by and the frequently nonlinear frequency transformation effect of crystal realize high efficiency and frequently conversion.Determined by many longitudinal modes 1319nm laser linewidth with the live width of frequency laser, single longitudinal mode 1064nm laser linewidth is much smaller than many longitudinal modes 1319nm laser linewidth, and it is on ignoring with the live width impact of frequency laser.Regulate control with the centre wavelength of frequency laser by single longitudinal mode 1064nm laser, its centre wavelength inverse strictly equals single longitudinal mode 1064nm laser center wavelength inverse and many longitudinal modes 1319nm laser center wavelength sum reciprocal.
A kind of all solid state and frequency sodium beacon laser device of the present invention, regulated the centre wavelength of control sodium beacon laser device by single longitudinal mode 1064nm laser, live width by many longitudinal modes 1319nm laser control sodium beacon laser device, the present invention controls centre wavelength, live width respectively on two lasers, both be easy to regulate the laser linewidth of obtaining in 0.1GHz ~ 1.0GHz scope, reduced again the complexity of laser, simple in structure, stable, reliable, be that sodium beacon laser device excites sodium atom to obtain effective solution route of high strength, high efficiency resonance scattering atom light echo.
Description of drawings
Fig. 1 is a kind of all solid state and structural representation of sodium beacon laser device frequently of the present invention;
Among the figure, 1. single longitudinal mode 1064nm laser 2. first lens 3. second lens, 4.45 degree total reflective mirrors longitudinal mode more than 5. 1319nm laser 6. the 3rd lens 7. the 4th lens 8.45 degree spectroscopes, 9. contracting bundle lens 10. and frequently crystal 11. a 589nm spectroscope 12. absorption cells 13. the 2nd 589nm spectroscope.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Embodiment 1
Fig. 1 is a kind of all solid state and structural representation of sodium beacon laser device frequently of the present invention.Among Fig. 1, of the present invention a kind of all solid state and frequently sodium beacon laser device comprise single longitudinal mode 1064nm laser 1, first lens 2, the second lens 3,45 degree total reflective mirrors 4, many longitudinal modes 1319nm laser 5, the 3rd lens 6, the 4th lens 7,45 degree spectroscopes 8, contracting bundle lens 9, with frequency crystal 10, the one 589nm spectroscope 11, absorption cell 12, the two 589nm spectroscopes 13.First lens 2, the second lens 3,45 degree total reflective mirrors 4 are successively set on the single longitudinal mode 1064nm laser 1 transmission light path, first lens 2 is parallel with single longitudinal mode 1064nm laser 1 optical axis with the second lens 3 central shafts, and 45 degree total reflective mirrors, 4 minute surfaces become 45 degree to place with single longitudinal mode 1064nm laser 1 optical axis.The 5 optical axis settings of many longitudinal modes 1319nm laser are parallel with single longitudinal mode laser 1 optical axis, the 3rd lens 6, the 4th lens 7,45 degree spectroscopes 8 are successively set on many longitudinal modes 1319nm laser 5 transmission light paths, the 3rd lens 6 are parallel with many longitudinal modes 1319nm laser 5 optical axises with the 4th lens 7 central shafts, 45 degree spectroscopes 8 are 45 degree with many longitudinal modes 1319nm laser 5 optical axis included angles, and the minute surface center of 45 degree spectroscopes 8 is arranged on single longitudinal mode 1064nm laser 1 reflection optical axis and many longitudinal modes 1319nm laser 5 optical axis intersections point; Many longitudinal modes 1319nm lasers 5 that contracting bundle lens 9 and frequency crystal 10, a 589nm spectroscope 11, absorption cell 12 are successively set on via 8 transmissions of 45 degree spectroscopes transmit on the light paths, be arranged at 9 one times of focal length places of contracting bundle lens with frequency crystal 10, the optical axis included angle of a 589nm spectroscope 11 minute surfaces and Multi-Longitudinal Mode laser 5 is 45 degree; The 2nd 589nm spectroscope 13 is arranged on the reflected light path of a 589nm spectroscope 11, and minute surface and reflection optical axis angle are 45 degree.
In the present embodiment, described single longitudinal mode 1064nm laser 1 vacuum central wavelength is 1064.500nm to 1064.700nm, live width is 1kHz approximately, polarization state is the s linearly polarized light, working system is hundred microsecond long pulse systems, and repetition is 50Hz, and pulsewidth is 150 μ s, average power is 40W, and spot size is Φ 2.0mm.
The minute surface diameter of first lens 2, the second lens 3 is Φ 10mm, and focal length is respectively 100mm, 100mm.
Many longitudinal modes 1319nm laser 5 vacuum central wavelength are 1319.389nm to 1319.082nm, live width is 0.1GHz, polarization state is identical with single longitudinal mode 1064nm laser 1, working system is hundred microsecond long pulse systems, repetition, pulsewidth are identical with single longitudinal mode 1064nm laser, average power is 25W, and spot size is Φ 4.0mm.
The minute surface diameter of the 3rd lens 6, the 4th lens 7 is Φ 10mm, and focal length is respectively 300mm, 150mm.
8 pairs of 1064nm laser of 45 degree spectroscopes are high anti-, reflectivity R 〉=99.5%, and thoroughly high to 1319nm laser, transmitance is T 〉=98%.
Contracting bundle lens 9 minute surface diameters are Φ 10mm, and focal length is 200mm, and focal length is 20 times of minute surface diameter.
With frequency crystal 10 be I class noncritical phase matching lbo crystal, cutting angle θ=90o, Φ=0o, crystal cross section are 4mm*4mm, length is 80mm, working temperature is 40 ℃.
Embodiment 2
The present embodiment is identical with the basic structure of embodiment 1, and difference is, single longitudinal mode 1064nm Linewidth of laser is 1MHz, and working system is continuous system, and spot size is Φ 5mm;
The minute surface diameter of first lens, the second lens is Φ 30mm, focal length be respectively 600mm ,-300mm;
Many longitudinal modes 1319nm Linewidth of laser is 0.5GHz, and working system is continuous system, and spot size is Φ 6mm;
The minute surface diameter of the 3rd lens, the 4th lens is Φ 30mm, focal length be respectively 300mm ,-100mm;
Contracting bundle lens minute surface diameter is Φ 30mm, and focal length is 150mm, and focal length is 5 times of minute surface diameter.
With the frequency crystal length be 50mm.
Embodiment 3
The present embodiment is identical with the basic structure of embodiment 1, and difference is, single longitudinal mode 1064nm Linewidth of laser is 10MHz, and repetition rate is 500Hz, and pulsewidth is 100ns, and average power is 300W.
The minute surface diameter of first lens, the second lens is Φ 50mm, focal length be respectively 600mm ,-500mm.
Many longitudinal modes 1319nm Linewidth of laser is 1.0GHz, and repetition rate is 500Hz, and pulsewidth is 200ns, and average power is 240W, and spot size is Φ 1mm.
The minute surface diameter of the 3rd lens, the 4th lens is Φ 20mm, and focal length is respectively-100mm, 200mm.
The minute surface diameter of contracting bundle lens is Φ 50mm, and focal length is 500mm, and focal length is 10 times of minute surface diameter.
With the length of frequency crystal be 20mm.
Embodiment 4
The present embodiment is identical with the basic structure of embodiment 1, and difference is, the repetition rate of single longitudinal mode 1064nm laser is 500Hz, and average power is 20W.
The repetition rate of many longitudinal modes 1319nm laser is 500Hz, and average power is 16W, and polarization state is and the orthogonal linearly polarized light of single longitudinal mode 1064nm laser polarization axle.
With the frequency crystal be II class phase matched ktp crystal, cutting angle θ=78o, Φ=0o, crystal cross section are 4mm*4mm, length is 20mm, working temperature is 30 ℃.
Embodiment 5
The present embodiment is identical with the basic structure of embodiment 1, and difference is that the pulsewidth of single longitudinal mode 1064nm laser is 100ns.
The pulsewidth of many longitudinal modes 1319nm laser is 100ns, and polarization state is and the orthogonal linearly polarized light of single longitudinal mode 1064nm laser polarization axle.
With the frequency crystal be II class phase matched ktp crystal, cutting angle θ=78o, Φ=0o, crystal cross section are 6mm*6mm, length is 10mm, working temperature is 30 ℃.
Embodiment 6
The present embodiment is identical with the basic structure of embodiment 1, and difference is that the pulsewidth of single longitudinal mode 1064nm laser is 20ns.
The pulsewidth of many longitudinal modes 1319nm laser is 20ns, and polarization state is and the orthogonal linearly polarized light of single longitudinal mode 1064nm laser polarization axle.
With the frequency crystal be II class phase matched ktp crystal, cutting angle θ=78o, Φ=0o, crystal cross section are 8mm*8mm, length is 5mm, working temperature is 30 ℃.
Claims (5)
1. all solid state and sodium beacon laser device frequently, comprise 45 degree total reflective mirrors (4), 45 degree spectroscopes (8), contracting bundle lens (9) and frequency crystal (10), a 589nm spectroscope (11), absorption cell (12), the 2nd 589nm spectroscope (13), it is characterized in that: described laser also comprises single longitudinal mode 1064nm laser (1), first lens (2), the second lens (3), many longitudinal modes 1319nm laser (5), the 3rd lens (6), the 4th lens (7); First lens (2), the second lens (3), 45 degree total reflective mirrors (4) are successively set on single longitudinal mode 1064nm laser (1) the transmission light path, first lens (2) is parallel with single longitudinal mode 1064nm laser (1) optical axis with the second lens (3) central shaft, and 45 degree total reflective mirror (4) minute surfaces become 45 degree to arrange with single longitudinal mode 1064nm laser (1) optical axis; Many longitudinal modes 1319nm laser (5) optical axis setting is parallel with single longitudinal mode laser (1) optical axis, the 3rd lens (6), the 4th lens (7), 45 degree spectroscopes (8) are successively set on many longitudinal modes 1319nm laser (5) transmission light path, the 3rd lens (6) are parallel with many longitudinal modes 1319nm laser (5) optical axis with the 4th lens (7) central shaft, 45 degree spectroscopes (8) are 45 degree with many longitudinal modes 1319nm laser (5) optical axis included angle, and the minute surface center of 45 degree spectroscopes (8) is arranged on single longitudinal mode 1064nm laser (1) reflection optical axis and many longitudinal modes 1319nm laser (5) optical axis intersection point; Many longitudinal modes 1319nm lasers (5) that contracting bundle lens (9) and frequency crystal (10), a 589nm spectroscope (11), absorption cell (12) are successively set on via 45 degree spectroscope (8) transmissions transmit on the light path, be arranged at (9) one times of focal length places of contracting bundle lens with frequency crystal (10), the optical axis included angle of 589nm spectroscope (a 11) minute surface and Multi-Longitudinal Mode laser (5) is 45 degree; The 2nd 589nm spectroscope (13) is arranged on the reflected light path of a 589nm spectroscope (11), and minute surface and reflection optical axis angle are 45 degree.
2. a kind of all solid state and sodium beacon laser device frequently according to claim 1, it is characterized in that: described single longitudinal mode 1064nm laser (1) is the diode pumping full-solid laser, the vacuum central wavelength is 1064.500nm to 1064.700nm, and live width is 1kHz ~ 10MHz.
3. a kind of all solid state and sodium beacon laser device frequently according to claim 1, it is characterized in that: described many longitudinal modes 1319nm laser (5) is the diode pumping full-solid laser, the vacuum central wavelength is 1319.082nm to 1319.389nm, and live width is 0.1GHz ~ 1.0GHz.
4. a kind of all solid state and sodium beacon laser device frequently according to claim 1, it is characterized in that: described and frequency crystal (10) is I class noncritical phase matching lbo crystal, and cutting angle is θ=90o, Φ=0o, length is 20mm ~ 80mm, and working temperature is 40 ℃.
5. a kind of all solid state and sodium beacon laser device frequently according to claim 1 is characterized in that: described and frequently crystal (10) be II class phase matched ktp crystal, cutting angle θ=78o, Φ=0o, length is 5mm ~ 20mm, working temperature is 30 ℃.
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| CN104269731A (en) * | 2014-05-14 | 2015-01-07 | 中国科学院理化技术研究所 | Sum frequency sodium beacon laser |
| CN104466640A (en) * | 2014-12-25 | 2015-03-25 | 中国科学技术大学 | All-fiber frequency transformation seed light system applied to sodium laser radar |
| CN108054625A (en) * | 2018-01-22 | 2018-05-18 | 中国工程物理研究院应用电子学研究所 | Longitudinal mode is all solid state and frequency sodium beacon laser device for a kind of modulation |
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Application publication date: 20130403 |