CN1905294A - LD pumping cogain double cavity very-large frequency difference double frequency Nd:YAG laser - Google Patents
LD pumping cogain double cavity very-large frequency difference double frequency Nd:YAG laser Download PDFInfo
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Abstract
The invention discloses an LD pumped co-gain double-cavity very large frequency difference double-frequency Nd:YAG laser, comprising: LD, LD controller, LD tail fiber, collecting optical system and laser resonance cavities, where the left end face of the Nd:YAG crystal and a first output coupling mirror compose a straight line cavity, KTP frequency doubling crystal and polarizing light splitting prism are arranged in order behind the Nd:YAG crystal in the straight line, a second output coupling mirror is arranged in the direction vertical to the axis of the straight line cavity and in the position corresponding to the polarizing light splitting prism, the left end surface of the Nd:YAG crystal and the second output coupling mirror compose a right angle cavity, the two resonance cavities contain the same Nd:YAG crystal and birefracting filter plate composed of polarizing light splitting prism and KTP frequency doubling crystal, making them both operate in single longitudinal mode; the straight line cavity and the right angle cavity can contain two KTP frequency doubling crystals which compose two birefracting filter plates with the polarizing light splitting prism, thus making the two resonance cavities both operate in single longitudinal mode. And two single-frequency green lights outputted by the straight line cavity and the right angle cavity are merged into orthotropic linear polarizing double frequency 532 green light whose maximum frequency difference can reach 360GHz.
Description
Technical field
The invention belongs to the Solid State Laser technical field, relate to a kind of double frequency Nd:YAG laser, be specifically related to the double frequency Nd:YAG laser of a kind of laser diode (LD) pumping gain altogether two-chamber very-large frequency difference.
Background technology
People such as the France Rennes M.Brunel of university adopt the horizontal vertical pumping Nd:YAG of the orhtogonal linear polarizaiton titanium precious stone laser crystal at a distance of about 1mm of two bundles, a 1064nm quarter-wave plate is respectively placed to eliminate the effects of spatial of gain in the crystal both sides, fast by changing two wave plates, angle between the slow axis, and be aided with vitreous silica F-P etalon angle tuning, realized that frequency difference is the 1064nm double-frequency laser of the 0～26GHz output [M.Brunel that vibrates simultaneously, F.Bretenaker.Tunable optical microwave sourceusing spatially resolved laser eigenstates.Opt.Lett., 1997,22 (5): 384-386].The shortcoming of this two-frequency laser is: element is many in the chamber, complex structure, the frequency difference tuning process is loaded down with trivial details, be unfavorable for that frequency and frequency difference are stable, also be unfavorable for device miniaturization, and adopt ti sapphire laser to make pumping source, and increased the cost of laser system greatly, limited its range of application to a certain extent.
People such as the V.G.Gudelev of Byelorussia national academy of sciences design and have made a kind of tunable double frequency Nd:YAG of coupling cavity laser [V.G.Gudelev of LD end-pumping, V.V.Mashko, and N.K.Neekenko et al., Diode-pumped cw tunable two-frequency YAG:Nd
3+Laser withcoupled resonators.Appl.Phys.B 76,249-252 (2003)].Nd:YAG crystal both ends of the surface and sphere output coupling mirror have constituted three resonant cavitys (wherein two active cavities and a passive cavity), utilize mutual coupling between these three chambeies to close characteristic and carry out laser longitudinal module and select; By the output coupling mirror material that is within the laserresonator is applied applied external force to produce photoelastic effect, laser longitudinal module is divided, thereby output pairwise orthogonal linear polarization 1064nm continuous wave tunable double-frequency laser, the frequency difference tuning range is 50MHz～8.4GHz, has obtained the double-frequency laser output of 12mW under the 240mW draw power.The frequency difference of this two-frequency laser is also still smaller.
MITI of Japan has developed the post and telecommunications research laboratory the two longitudinal mode Nd:YVO of a kind of LD pumping frequency multiplication of outer-cavity
4Microplate green laser [the M.Tani of system, P.Gu, M.Hyodo, K.Sakai, and T.Hidaka, Generation of coherent terahertz radiation by photomixing of dual-modelasers.Optical and Quantum Electronis 32,503-520 (2000)].Used microplate thickness is 0.5mm, the about 3mm of cavity length, and by the long thermal drift of frequency stabilization system control chamber, obtaining frequency difference is the two longitudinal mode double-frequency laser outputs of 1064nm (the about 100kHz of live width) of 50.5GHz, having obtained frequency difference after exocoel LiNbO3 frequency multiplication is the double frequency 532nm green glow output of 101GHz, when the fundamental frequency luminous power was 220mW, 532nm green glow power output can reach 65mW.This couple of longitudinal mode double frequency Nd:YVO
4The shortcoming of micro-slice laser is that its frequency difference is difficult to further enlarge, and frequency difference can not be tuning.
Tsing-Hua University's precision measurement technology and instrument National Key Laboratory have carried out the LD pumping double frequency Nd:YAG laser technology research work [Huang Chunning based on the stress birfringence effect, Li Yan, Guo Hui etc., the tunable two-frequency laser of novel large frequency-difference, photoelectron laser, 2002,13 (3): 229～231].At monolithic Nd:YAG crystal two sides evaporated dielectric film, directly form the flat-matrix resonant cavity of sealing, when the LD draw power is not too big, can export the 1064nm single longitudinal mode laser; Fluid pressure is affacted on the diametric(al) of Nd:YAG crystal by pressue device, because the cause of stress birfringence effect, laser longitudinal mode splitting is the o mould and the e mould of two orhtogonal linear polarizaitons, thereby produce the output of 1064nm double frequency Nd:YAG laser, its frequency difference can be tuning with the change of impressed pressure, and the maximum frequency difference that experiment obtains is 3.4GHz.The shortcoming of this LD pumping stress birefringence double-frequency Nd:YAG laser is that the frequency difference tuning range is little, and because thoroughly do not eliminate the gain effects of spatial technically, so the LD draw power can not be too high, the result makes the power output of double-frequency laser smaller.
Beijing Institute of Technology photoelectric project system has designed that [Lu is verdant and thick based on the tunable double frequency Nd:YAG of the LD pumping laser that reverses the die cavity technology, Zhao Changming, Wu Keying, utilize little imbalance to reverse die cavity and produce double-frequency laser, Beijing Institute of Technology's journal, 1999,19 (3): 343-347], promptly place two orthogonal 1064nm quarter-wave plates of crystalline axis direction,, obtain single longitudinal mode vibration output to eliminate the gain effects of spatial in Nd:YAG crystal both sides; When these two quarter-wave plates are in little imbalance state, can realize double-frequency laser output, its frequency difference size depends on the misalignment rate of two wave plates, the frequency difference tuning range from tens MHz to 1GHz.The shortcoming of this two-frequency laser is that the frequency difference tuning range is little, and can't obtain the bigger double-frequency laser output of frequency difference.
At " Chinese laser " (2001,28 (2): the article 100-102) " large frequency-difference birefringence double-frequency Nd:YAG laser " (author: burnt star, Zhang Shulian, Liang Jinwen) a kind of LD pumping birefringence double-frequency Nd:YAG laser is disclosed, a birefringence F-P etalon of making of crystalline quartz is inserted in the resonant cavity of LD pumping Nd:YAG laser, because of there being birefringence effect in the chamber, each laser longitudinal mode splitting is the linearly polarized mode (being o mould and e mould) of two mutually orthogonals; Equally, the unique very big transmission peaks of F-P etalon also be divided into two (promptly being split into o peak and e peak) in the Nd:YAG laser gain bandwidth range.If make an o mould be positioned at the centre frequency place at o peak, and make an e mould be positioned at the centre frequency place at e peak, running when can realize o mould and e mould is exported thereby obtain the 1064nm double-frequency laser.Experiment is 0.645mm with the geometric thickness of crystalline quartz F-P etalon, cutting angle (angle between the optical axis of crystal and the plane of crystal normal) is 10 °, the Nd:YAG laser chamber is long to be 40mm, adjust the inclination angle of crystalline quartz F-P etalon in the chamber, vibration output when having obtained frequency difference and be about the two longitudinal mode double-frequency laser of the 1064nm orhtogonal linear polarizaiton of 2GHz.The shortcoming of this two-frequency laser be adjustment required precision to quartz crystal birefringence F-P etalon in the chamber than higher, frequency difference is smaller and can not be tuning.
At present, the frequency difference of the double frequency Nd:YAG laser of home and overseas colleague expert research and development is respectively less than 3.4GHz and 26GHz, and the frequency difference of the two longitudinal mode double frequency Nd:YVO4 microplate green (light) lasers of LD pumping is 101GHz.
Summary of the invention
The object of the present invention is to provide a kind of LD pumping of the very-large frequency difference two-chamber double frequency Nd:YAG laser that gains altogether, solved the smaller problem of existing two-frequency laser frequency difference, for the THz radiation provides perfect light source with photoconductivity switching, microwave and millimeter-wave systems and absolute distance interferometer measuration system.
The technical solution adopted in the present invention is, LD pumping cogain double cavity very-large frequency difference double frequency Nd:YAG laser, comprise LD and LD controller, LD focuses in the Nd:YAG crystal through converging optical system by the pump light of LD tail optical fiber output, the left side of Nd:YAG crystal and output coupling mirror constitute laserresonator, in the laserresonator, the left side of Nd:YAG crystal and first output coupling mirror constitute line chamber, be disposed with KTP frequency-doubling crystal and polarization splitting prism in the line chamber after the Nd:YAG crystal, be provided with second output coupling mirror with the perpendicular direction of line chamber chamber axle and with the corresponding position of polarization splitting prism, the left side of Nd:YAG crystal and the second output coupling mirror form right angle chamber, the back of first output coupling mirror is provided with first speculum, the back of second output coupling mirror is provided with second speculum, arrives second polarization splitting prism through two bundle single-frequency green glows of first speculum and second mirror reflects and realizes closing light.
Characteristics of the present invention are that also four working faces of polarization splitting prism all plate 1064nm and the anti-reflection deielectric-coating of 532nm.
Be provided with the 3rd polarization splitting prism with the perpendicular direction of line chamber chamber axle and with the corresponding position of polarization splitting prism, the 3rd polarization splitting prism is sent the 1064nm single-frequency laser that transmits into the F-P chamber, the voltage on the piezoelectric ceramic tube that servo-control system is regulated and first output coupling mirror is bonding.
Another technical scheme of the present invention is, LD pumping cogain double cavity very-large frequency difference double frequency Nd:YAG laser, comprise LD and LD controller, LD focuses in the Nd:YAG crystal through converging optical system by the pump light of LD tail optical fiber output, the left side of Nd:YAG crystal and output coupling mirror constitute laserresonator, in the laserresonator, the left side of Nd:YAG crystal and first output coupling mirror constitute line chamber, be disposed with polarization splitting prism and KTP frequency-doubling crystal in the line chamber after the Nd:YAG crystal, be provided with second output coupling mirror with the perpendicular direction of line chamber chamber axle and with the corresponding position of polarization splitting prism, the left side of Nd:YAG crystal and the second output coupling mirror form right angle chamber, be provided with the 2nd KTP frequency-doubling crystal in the chamber, right angle between the polarization splitting prism and second output coupling mirror, the back of first output coupling mirror is provided with first speculum, the back of second output coupling mirror is provided with second speculum, arrives second polarization splitting prism through two bundle single-frequency green glows of first speculum and second mirror reflects and realizes closing light.
Four working faces of polarization splitting prism all plate 1064nm and the anti-reflection deielectric-coating of 532nm.
In the resonant cavity of LD pumping Nd:YAG laser, place a polarization splitting prism (PBS), to substitute traditional monolithic or multi-disc BP element, form novel birefringent filter (as PBS-KTP etc.) with birefringece crystal in the chamber (as KTP etc.), laser is turned round with single longitudinal mode; Adopt this novel birefringent filter mode selection technique, make have the common gain medium two laserresonators of (Nd:YAG crystal), thereby obtain the output of vibrating simultaneously of orhtogonal linear polarizaiton double frequency Nd:YAG laser all with single longitudinal mode operation.
The present invention adopts has optically isotropic Nd:YAG crystal as gain medium, the about 180GHz of its gain bandwidth.Fundamental frequency light (1064nm) the single longitudinal mode frequency of oscillation of two resonant cavitys can be regulated in 0～180GHz scope simultaneously, so, the maximum frequency difference of 1064nm orhtogonal linear polarizaiton double-frequency laser can reach 180GHz, after the nonlinear optics frequency multiplication, the maximum frequency difference of orhtogonal linear polarizaiton double frequency 532nm green glow can reach 360GHz.
Description of drawings
Fig. 1 is the LD pumping of the present invention two-chamber double frequency Nd:YAG laser schematic diagram that gains altogether; Wherein, a is Nd:YAG gain curve and PBS-KTP birefringent filter p component and s component light wave transmittance curve, and b is fundamental frequency light p component and s component " frequency comb ", and c is the two longitudinal modes of the fundamental frequency light mode spectrums that vibrate simultaneously.
Fig. 2 is a kind of LD pumping cogain double cavity very-large frequency difference double frequency Nd:YAG laser structure schematic diagram of the present invention;
Fig. 3 is an another kind of LD pumping cogain double cavity very-large frequency difference double frequency Nd:YAG laser structure schematic diagram of the present invention;
Fig. 4 is a kind of experimental system schematic diagram to laser of the present invention.
Among the figure, 1.LD controller, 2.LD, 3.LD tail optical fiber 4. converges optical system, the 5.Nd:YAG crystal, 6.KTP frequency-doubling crystal, 7. polarization splitting prism, 8. first output coupling mirror, 9. piezoelectric ceramic tube, 10. second output coupling mirror, 11. piezoelectric ceramic tubes, 12. second speculum, 13. first speculums, 14. second polarization splitting prisms, 15. the 3rd polarization splitting prism, the 16.F-P chamber; 17. servo-control system, 18. the 2nd KTP frequency-doubling crystals.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Because the Nd:YAG laser line is a HOMOGENEOUS BROADENING, therefore the Nd:YAG laser generally vibrates with single longitudinal mode, but owing to there is the effects of spatial of gain, when external excitation is strong, the Nd:YAG laser usually is operated in many longitudinal modes state, so in the process of research and development double frequency Nd:YAG laser, laser longitudinal module selection technology is occupied extremely important status.In many laser longitudinal module selection technology, the birefringent filter BP-KTP mode selection technique of being made up of Brewster sheet BP and nonlinear optics frequency-doubling crystal KTP has been successfully used in all solid state single frequency laser of middle low power LD pumping.When draw power is big, multimode oscillation output can appear, for addressing this problem, place two or multi-disc BP element in the laser cavity of being everlasting, with the common form dielectric grid filter of ktp crystal in the chamber, laser is vibrated with single longitudinal mode.
The present invention places a polarization splitting prism PBS in the resonant cavity of LD pumping inner chamber KTP frequency multiplication 532nm Nd:YAG green (light) laser, to substitute traditional monolithic or multi-disc BP element, form novel birefringent filter PBS-KTP with ktp crystal in the chamber, laser is turned round with single longitudinal mode; Adopt PBS-KTP birefringent filter mode selection technique and optical frequency-doubling technology in the chamber, make have the common gain medium two laserresonators of (Nd:YAG crystal) all with single longitudinal mode operation, output thereby acquisition orhtogonal linear polarizaiton double frequency Nd:YAG laser vibrates simultaneously.The frequency difference of 1064nm double-frequency laser is tunable in 0～180GHz scope, and its maximum frequency difference can reach 180GHz, and behind optical frequency-doubling, the frequency difference of orhtogonal linear polarizaiton double frequency 532nm green glow is tunable in 0～360GHz scope, and its maximum frequency difference can reach 360GHz.
Fig. 1 is the LD pumping of the present invention two-chamber double frequency Nd:YAG laser schematic diagram that gains altogether.Nd:YAG gain curve and birefringent filter transmittance curve are shown in figure a (p component and s component transmittance curve are represented with solid line and dotted line respectively); Two-chamber resonant mode " frequency comb " is shown in figure b (solid line and dotted line are represented fundamental frequency light p component and s component laser longitudinal module resonance frequency respectively); The two longitudinal modes of fundamental frequency light positive intersection polarization vibrate mode spectrum simultaneously shown in figure c.As can be seen from the figure, vibration when can realize the two longitudinal mode double frequency 1064nm laser of pairwise orthogonal linear polarization by two-chamber birefringent filter mode selection technique, its frequency difference can reach 180GHz.
LD pumping cogain double cavity very-large frequency difference double frequency Nd:YAG laser structure of the present invention as shown in Figure 2.Comprise LD 2 and LD controller 1, LD 2 focuses in the Nd:YAG crystal 5 through converging optical system 4 by the pump light of LD tail optical fiber 3 outputs, the left side of Nd:YAG crystal 5 and output coupling mirror constitute laserresonator, in laserresonator, the left side of Nd:YAG crystal 5 and first output coupling mirror 8 constitute line chamber, in line chamber, be disposed with KTP frequency-doubling crystal 6 and polarization splitting prism 7 after the Nd:YAG crystal 5, four working faces of polarization splitting prism 7 all plate 1064nm and the anti-reflection deielectric-coating of 532nm, be provided with second output coupling mirror 10 with the perpendicular direction of line chamber chamber axle and with polarization splitting prism 7 corresponding positions, the left side of Nd:YAG crystal 5 and second output coupling mirror, 10 form right angle chambeies.First output coupling mirror 8 is mutually bonding with piezoelectric ceramic tube 9 and 11 respectively with second output coupling mirror 10.Reflect through first speculum 13 and second speculum 12 respectively from two bundle 532nm single-frequency green glows of first output coupling mirror 8 and 10 outgoing of second output coupling mirror, close light, obtain orhtogonal linear polarizaiton 532nm double frequency green glow by second polarization splitting prism 14.
The present invention also adopts the Pound-Dreve-Hall technology that the frequency and the frequency difference of double-frequency laser are carried out frequency stabilization.With the perpendicular direction of line chamber chamber axle and with polarization splitting prism 7 corresponding positions the 3rd polarization splitting prism 15 is being set, the 1064nm single-frequency laser that transmits from the 3rd polarization splitting prism 15 enters F-P chamber 16, regulates the voltage that is added on the piezoelectric ceramic tube 9 through servo-control system 17.
Can adopt single only or in two birefringece crystals and the chamber polarization splitting prism form one or two birefringent filter, polarization splitting prism and the birefringece crystal relative position in the chamber can correspondingly change.Having the common gain medium--various stable cavities and neutrality chamber can be adopted in the line chamber and the chamber, right angle of Nd:YAG crystal, can comprise the various optical elements (as wedge etc.) that are used for the tuning laser frequency of oscillation in the chamber.
Another kind of LD pumping cogain double cavity very-large frequency difference double frequency Nd:YAG laser structure provided by the invention as shown in Figure 3, comprise LD 2 and LD controller 1, LD 2 focuses in the Nd:YAG crystal 5 through converging optical system 4 by the pump light of LD tail optical fiber 3 outputs, the left side of Nd:YAG crystal 5 and output coupling mirror constitute laserresonator, in laserresonator, the left side of Nd:YAG crystal 5 and first output coupling mirror 8 constitute line chamber, in line chamber, be disposed with polarization splitting prism 7 and KTP frequency-doubling crystal 6 after the Nd:YAG crystal 5, four working faces of polarization splitting prism 7 all plate 1064nm and the anti-reflection deielectric-coating of 532nm, be provided with second output coupling mirror 10 with the perpendicular direction of line chamber chamber axle and with polarization splitting prism 7 corresponding positions, the left side of Nd:YAG crystal 5 and second output coupling mirror, 10 form right angle chambeies, in the chamber, right angle, between the polarization splitting prism 7 and second output coupling mirror 10 the 2nd KTP frequency-doubling crystal 18 is set, the same with Fig. 2 structure, reflect through first speculum 13 and second speculum 12 respectively from two bundle 532nm single-frequency green glows of first output coupling mirror 8 and 10 outgoing of second output coupling mirror, close light by second polarization splitting prism 14, obtain orhtogonal linear polarizaiton 532nm double frequency green glow.
Double-frequency laser system for inner cavity frequency-doubling, a side outgoing of 1064nm orhtogonal linear polarizaiton double-frequency laser polarization splitting prism 7 in the chamber, two bundle 532nm single-frequency green glows obtain the output of double frequency green glow after closing light from output coupling mirror 8,10 outgoing of two resonant cavitys and by second polarization splitting prism 14 respectively; For the double-frequency laser system that does not adopt inner cavity frequency-doubling, a side outgoing of 1064nm orhtogonal linear polarizaiton double-frequency laser polarization splitting prism 7 in the chamber also can make two bundle 1064nm single-frequency lasers obtain the output of 1064nm double-frequency laser from the output coupling mirror outgoing of two resonant cavitys and after closing light respectively.
1064nm single-frequency laser outside line chamber or output coupling mirror effusion chamber, chamber, right angle or in the chamber 1064nm orhtogonal linear polarizaiton double-frequency laser outside the effusion chamber, a side of polarization splitting prism 7 to can be used for locking the chamber in line chamber or chamber, right angle long.By the optical length in locking line chamber or chamber, right angle, can stablize the frequency and the frequency difference of orhtogonal linear polarizaiton double frequency 1064nm fundamental frequency light and 532nm green glow.
Because the imperfection (light wave p component transmitance and s component reflectivity are all less than 100%) of PBS manufacture craft, will inevitably cause outside the effusion chamber, a side of sub-fraction 1064nm fundamental frequency light polarization splitting prism 7 in the chamber, 1064nm orhtogonal linear polarizaiton double-frequency laser outside this effusion chamber is after 15 beam split of the 3rd polarization splitting prism, p component light wave enters F-P chamber 16, regulate the direct voltage that is added on the piezoelectric ceramic tube 9 (bonding together) optical cavity length by servo-control system 17, thereby realize the stable of fundamental frequency light p component single longitudinal mode frequency of oscillation with the locking line chamber with output coupling mirror 8; In case stablized the frequency of oscillation of fundamental frequency light p component single longitudinal mode, fundamental frequency light s component single longitudinal mode frequency of oscillation also stable thereupon (because two resonant cavitys are symmetrical fully).Therefore, by the optical length of locking line chamber (or chamber, right angle), can stablize the frequency and the frequency difference of orhtogonal linear polarizaiton double frequency 1064nm fundamental frequency light and 532nm green glow.
Embodiment
Structure as shown in Figure 3, the nominal wavelength of LD 2 are 808nm, the core diameter 100 μ m of LD tail optical fiber 3, and numerical aperture NA=0.22, maximum fiber power is 1.5W.808nm pumping light converges in the Nd:YAG crystal 5 through converging optical system 4 (GRIN Lens is of a size of φ 2.6mm * 6.5mm, numerical aperture NA=0.6).The doping content of Nd:YAG crystal 5 is 1.1%, dimensions is 3mm * 3mm * 5mm, optical direction length is 5mm, its pumping end (left side) is coated with double-colored deielectric-coating, promptly to the high reflection of 1064nm (reflectivity is greater than 99.8%), to 808nm anti-reflection (transmitance is greater than 95%), the right side of the Nd:YAG crystal 5 plating anti-reflection deielectric-coating of 1064nm (transmitance is greater than 99.9%); The dimensions of polarization splitting prism 7 is 12.7mm * 12.7mm * 12.7mm in the chamber, and 1064nm light wave p component transmitance and s component reflectivity are respectively 99.6% and 99.95%; Two KTP frequency- doubling crystals 6 and 18 dimensions are 2mm * 2mm * 5mm, and optical direction length is 5mm, presses the cutting of II class phase matched, and both ends of the surface all are coated with 1064nm and 532nm anti-reflection film (transmitance is greater than 99.8%); The radius of curvature of first output coupling mirror 9 and second output coupling mirror 10 is 100mm, and sphere is coated with 1064nm high anti-(reflectivity is greater than 99%), 532nm is anti-reflection (transmitance is greater than 93%) double-colored deielectric-coating.
The optical cavity length in line chamber and chamber, right angle is about 80mm, by the orientation of element in careful adjusting resonant cavity and the chamber, has realized that two-chamber 532nm green glow exports simultaneously.When Nd:YAG crystal end-face pumping luminous power was 900mW, the power output that records line chamber and chamber, right angle 532nm green glow was respectively 1.3mW and 1.8mW; With the polarization state of analyzer inspection two-way green glow, find the linearly polarized light of their mutually orthogonal really; The 1064nm fundamental frequency light p component that overflow in polarization splitting prism 7 sides in the chamber and the luminous power of s component are respectively 3.2mW and 1mW, and its polarization direction is vertical with the 532nm green glow polarization direction of line chamber and the output of chamber, right angle respectively.
Below verify effect of the present invention by experiment.Experimental system has been placed a KTP frequency-doubling crystal 6 as shown in Figure 4 between Nd:YAG crystal 5 and polarization splitting prism 7, form birefringent filter PBS-KTP with polarization splitting prism 7.Obviously, comprise identical birefringent filter PBS-KTP and gain medium in line chamber and the chamber, right angle.Equal identical with Fig. 3 of all optical component dimensionss and characterisitic parameter in this system, the optical length in line chamber and chamber, right angle is about 50mm.Experiment is found: from the 532nm green glow of first output coupling mirror 8 and 10 outgoing of second output coupling mirror are mutually orthogonal linearly polarized lights, and its polarization direction is vertical with 1064nm fundamental frequency light polarization direction in the chamber, right angle with line chamber respectively; When the end-pumping luminous power of Nd:YAG crystal 5 is 900mW, be respectively 3mW and 1mW from the 532nm green glow power of first output coupling mirror 8 and the output of second output coupling mirror 10; The 1064nm fundamental frequency light that overflow in polarization splitting prism 7 sides in the chamber is through 15 beam split of the 3rd polarization splitting prism, and the luminous power that records p component and s component is respectively 7.1mW and 0.6mW.Because the green glow power output in line chamber and chamber, right angle and the 1064nm fundamental frequency luminous power that overflow in polarization splitting prism 7 sides in the chamber are all smaller, the modeling effect of birefringent filter PBS-KTP in the confocal F-P scanning interferometer observation chamber is adopted in inconvenience under the two-chamber situation.Second output coupling mirror 10 in Fig. 4 cathetus chamber is removed, recording the 1064nm/532nm luminous power in this position is 24.4mW, the 1064nm fundamental frequency luminous power of overflowing from polarization splitting prism 7 another sides is 18.5mW, and the 532nm green glow power of exporting from first output coupling mirror 8 is 4.2mW.Pattern with the confocal F-P scanning interferometer of 1064nm (Free Spectral Range is 3.75GHz) is observed line chamber found that this laser cavity 1064nm fundamental frequency light turns round with single longitudinal mode.
Claims (5)
1. LD pumping cogain double cavity very-large frequency difference double frequency Nd:YAG laser, comprise LD (2) and LD controller (1), LD (2) focuses in the Nd:YAG crystal (5) through converging optical system (4) by the pump light of LD tail optical fiber (3) output, the left side of Nd:YAG crystal (5) and output coupling mirror constitute laserresonator, it is characterized in that, in the described laserresonator, the left side of Nd:YAG crystal (5) and first output coupling mirror (8) constitute line chamber, Nd:YAG crystal (5) is disposed with KTP frequency-doubling crystal (6) and polarization splitting prism (7) afterwards in line chamber, be provided with second output coupling mirror (10) with the perpendicular direction of line chamber chamber axle and with the corresponding position of polarization splitting prism (7), the left side of Nd:YAG crystal (5) and second output coupling mirror (10) form right angle chamber, the back of described first output coupling mirror (8) is provided with first speculum (13), the back of described second output coupling mirror (10) is provided with second speculum (12), arrives second polarization splitting prism (14) through two bundle single-frequency green glows of first speculum (13) and second speculum (12) reflection and realizes closing light.
2. according to the described laser of claim 1, it is characterized in that four working faces of described polarization splitting prism (7) all plate 1064nm and the anti-reflection deielectric-coating of 532nm.
3. according to the described laser of claim 1, it is characterized in that, be provided with the 3rd polarization splitting prism (15) with the perpendicular direction of line chamber chamber axle and with the corresponding position of polarization splitting prism (7), the 3rd polarization splitting prism (15) is sent the 1064nm single-frequency laser that transmits into F-P chamber (16), the voltage on the piezoelectric ceramic tube (9) that servo-control system (17) is regulated and first output coupling mirror (8) is bonding.
4. LD pumping cogain double cavity very-large frequency difference double frequency Nd:YAG laser, comprise LD (2) and LD controller (1), LD (2) focuses in the Nd:YAG crystal (5) through converging optical system (4) by the pump light of LD tail optical fiber (3) output, the left side of Nd:YAG crystal (5) and output coupling mirror constitute laserresonator, it is characterized in that, in the described laserresonator, the left side of Nd:YAG crystal (5) and first output coupling mirror (8) constitute line chamber, Nd:YAG crystal (5) is disposed with polarization splitting prism (7) and KTP frequency-doubling crystal (6) afterwards in the line chamber, be provided with second output coupling mirror (10) with the perpendicular direction of line chamber chamber axle and with the corresponding position of polarization splitting prism (7), the left side of Nd:YAG crystal (5) and second output coupling mirror (10) form right angle chamber, be provided with the 2nd KTP frequency-doubling crystal (18) between polarization splitting prism in the chamber, right angle (7) and second output coupling mirror (10), the back of described first output coupling mirror (8) is provided with first speculum (13), the back of described second output coupling mirror (10) is provided with second speculum (12), arrives second polarization splitting prism (14) through two bundle single-frequency green glows of first speculum (13) and second speculum (12) reflection and realizes closing light.
5. according to the described laser of claim 4, it is characterized in that four working faces of described polarization splitting prism (7) all plate 1064nm and the anti-reflection deielectric-coating of 532nm.
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| CN102832529A (en) * | 2012-08-29 | 2012-12-19 | 武汉光迅科技股份有限公司 | Dual-frequency-laser-based photoproduction tunable microwave source and frequency stabilization control method |
| CN104242044A (en) * | 2014-09-29 | 2014-12-24 | 西安理工大学 | Electro-optical double-refraction double-cavity double-frequency Nd:YAG laser device and frequency difference tuning method |
| CN106471685A (en) * | 2014-01-24 | 2017-03-01 | 加州理工学院 | Double frequency light source |
| CN107785773A (en) * | 2016-08-25 | 2018-03-09 | 深圳大学 | A kind of double frequency light supply apparatus |
| CN107946896A (en) * | 2017-11-18 | 2018-04-20 | 西安石油大学 | A kind of Pound Drever Hall laser frequency stabilizing systems of heterodyne system phase-sensitive detection |
| CN109444004A (en) * | 2018-12-14 | 2019-03-08 | 西安理工大学 | Yb:YAG solid state laser self-mixed interference nano particle size sensor |
| CN112666130A (en) * | 2020-12-31 | 2021-04-16 | 西安理工大学 | Device and method for measuring viscoelasticity of biological tissue |
| CN112782125A (en) * | 2020-12-31 | 2021-05-11 | 西安理工大学 | Biological tissue elastic modulus measuring device and method |
| CN113346345A (en) * | 2021-04-20 | 2021-09-03 | 北京理工大学 | Solid laser capable of outputting vector vortex light beams with different modes at two ends |
| CN114624682A (en) * | 2022-05-17 | 2022-06-14 | 中国科学技术大学 | Method and system for suppressing near field strength echo signal |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2658367B1 (en) * | 1990-02-13 | 1992-06-05 | Sagem | LASER PROVIDING TWO WAVES AT DIFFERENT FREQUENCIES. |
| AU7309400A (en) * | 1999-09-15 | 2001-04-17 | Yeda Research And Development Co. Ltd. | Optical resonators with orthogonally polarized modes |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832529A (en) * | 2012-08-29 | 2012-12-19 | 武汉光迅科技股份有限公司 | Dual-frequency-laser-based photoproduction tunable microwave source and frequency stabilization control method |
| CN106471685B (en) * | 2014-01-24 | 2019-07-09 | 加州理工学院 | Double frequency light source |
| CN106471685A (en) * | 2014-01-24 | 2017-03-01 | 加州理工学院 | Double frequency light source |
| CN104242044A (en) * | 2014-09-29 | 2014-12-24 | 西安理工大学 | Electro-optical double-refraction double-cavity double-frequency Nd:YAG laser device and frequency difference tuning method |
| CN107785773A (en) * | 2016-08-25 | 2018-03-09 | 深圳大学 | A kind of double frequency light supply apparatus |
| CN107946896A (en) * | 2017-11-18 | 2018-04-20 | 西安石油大学 | A kind of Pound Drever Hall laser frequency stabilizing systems of heterodyne system phase-sensitive detection |
| CN107946896B (en) * | 2017-11-18 | 2019-09-27 | 西安石油大学 | A kind of Pound-Drever-Hall laser frequency stabilizing system of heterodyne system phase-sensitive detection |
| CN109444004A (en) * | 2018-12-14 | 2019-03-08 | 西安理工大学 | Yb:YAG solid state laser self-mixed interference nano particle size sensor |
| CN109444004B (en) * | 2018-12-14 | 2021-05-18 | 西安理工大学 | Yb-YAG solid laser self-mixing interference nano-grain size sensor |
| CN112666130A (en) * | 2020-12-31 | 2021-04-16 | 西安理工大学 | Device and method for measuring viscoelasticity of biological tissue |
| CN112782125A (en) * | 2020-12-31 | 2021-05-11 | 西安理工大学 | Biological tissue elastic modulus measuring device and method |
| CN112782125B (en) * | 2020-12-31 | 2023-02-28 | 西安理工大学 | Biological tissue elastic modulus measuring device and method |
| CN113346345A (en) * | 2021-04-20 | 2021-09-03 | 北京理工大学 | Solid laser capable of outputting vector vortex light beams with different modes at two ends |
| CN114624682A (en) * | 2022-05-17 | 2022-06-14 | 中国科学技术大学 | Method and system for suppressing near field strength echo signal |
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