CN101498877B - Dual-wavelength laser frequency doubling device - Google Patents
Dual-wavelength laser frequency doubling device Download PDFInfo
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- CN101498877B CN101498877B CN200810070579.3A CN200810070579A CN101498877B CN 101498877 B CN101498877 B CN 101498877B CN 200810070579 A CN200810070579 A CN 200810070579A CN 101498877 B CN101498877 B CN 101498877B
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Abstract
The present invention relates to a novel device of dual wavelength laser frequency doubling. The corresponding phase matching angles of the laser of different wavelength are different in nonlinear optical crystal, which is a problem necessitating consideration when designing a device which can realize simultaneous frequency doubling to dual wavelength laser. By means of geometric calculation and cutting shape design, a device which can realize simultaneous frequency doubling to dual wavelength laser is acquired. The laser of dual wavelength is made to transmit alongside the phase matching direction of the laser of one wavelength to generate the frequency doubled light of the wavelength. When reaching the end face of crystal the laser bundle is shifted to travel along the phase matching direction of the laser of the other wavelength by reflection, thus acquiring the frequency doubled light of corresponding wavelength.
Description
Technical field
The present invention relates to laser frequency-doubling device.
Background technology
Non-linear optical field is widely used all kinds of laser frequency-doubling devices, has effectively expanded the range of application of laser.Most laser frequency-doubling devices are made by nonlinear optical crystal, in order to reach good laser freuqency doubling effect, conventionally all will make laser propagate along its phase matching direction corresponding in crystal, so nonlinear optics conversion is subject to the restriction of phase-matching condition, angle tolerance, temperature tolerance angle and beam quality etc.Consideration based on numerous design aspects, most laser frequency-doubling devices, all only for specific wavelength, generally can only be realized the frequency multiplication of single wavelength laser, frequency multiplication when cannot obtain dual-wavelength laser now.And along with developing rapidly that visible waveband laser is applied, increasing to the demand of dual wavelength and even multi-wavelength visible waveband laser.The laser frequency-doubling device the present invention relates to, a branch of laser with dual wavelength that can make incident obtains their frequency doubled lights separately after by this device, and this device is only used a crystal.
Summary of the invention
The object of the invention is to by changing the shape of cutting of nonlinear optical crystal, make the dual-wavelength laser of incident in crystal, after corresponding phase matching direction, obtain two corresponding frequency doubled lights by it.
For realizing the object of the invention, one of the present invention program is: a kind of dual-wavelength laser frequency doubling device, by monolithic nonlinear optical crystal, processed, it is characterized in that: nonlinear optical crystal 1 comprises a plane of incidence 7, a reflecting surface 6 and an exit facet 8, the normal direction of the plane of incidence 7 and exit facet 8 is respectively along dual-wavelength laser medium wavelength a, b realizes the corresponding phase matching direction of frequency-doubled effect, the normal of reflecting surface 6 is the bisector of the angle α of the plane of incidence 7 and 8 two normals compositions of exit facet, dual-wavelength laser is first propagated along phase matching direction corresponding to wavelength a after entering this frequency doubling device by the plane of incidence 7, by the mirror-reflection effect of reflecting surface 6, transfer and propagate along phase matching direction corresponding to wavelength b again, finally from exit facet 8, leave device, obtain 5 outputs of dual wavelength frequency double light.
Realizing two of technical scheme of the present invention is: a kind of dual-wavelength laser frequency doubling device, by monolithic nonlinear optical crystal, processed, it is characterized in that: nonlinear optical crystal 1 comprises a plane of incidence 7, a reflecting surface 6, an exit facet 8 and two offside reflection faces 9, 10, the normal direction of the plane of incidence 7 and exit facet 8 is respectively along dual-wavelength laser medium wavelength a, b realizes the corresponding phase matching direction of frequency-doubled effect, the normal of reflecting surface 6 is the bisector of the angle α of the plane of incidence 7 and 8 two normals compositions of exit facet, two offside reflection faces 9, 10 normal is the bisector of another angle β of the plane of incidence 7 and 8 two normals compositions of exit facet, dual-wavelength laser is first propagated along phase matching direction corresponding to wavelength a after entering this frequency doubling device by the plane of incidence 7, by the mirror-reflection effect of one of them offside reflection face 9, transfer along propagating in phase matching direction corresponding to wavelength b, mirror-reflection by reflecting surface 6 forwards to along phase matching direction corresponding to wavelength a and propagates again, then by after the mirror-reflection of another offside reflection face 10, along the phase matching direction that wavelength b is corresponding, from exit facet 8, leave device, obtain 5 outputs of dual wavelength frequency double light.
The laser of different wave length corresponding phase matching angle in nonlinear optical crystal is different, when design can realize the device of frequency multiplication simultaneously to dual-wavelength laser, must consider this problem.By geometry, calculating and cut shape designs, obtaining can be to the dual-wavelength laser device of frequency multiplication simultaneously: make dual-wavelength laser first along the phase matching direction of one of them wavelength laser, propagate the frequency doubled light that obtains this wavelength, thereby make laser beam forward in the phase matching direction of another wavelength laser when arriving the reflecting surface of device by reflection, advance and obtain the frequency doubled light of this wavelength.
The actuating medium of laser frequency-doubling device is nonlinear optical crystal.
Principle of design of the present invention is: according to the optical parametric of the wavelength of dual-wavelength laser and nonlinear optical crystal, calculate the phase matching direction that each wavelength is corresponding, according to result of calculation, determine the plane at these two phase matching direction places, according to design proposal, process frequency doubling device, this device mainly comprises an incident end face, an outgoing end face and several reflection end faces.The laser beam that contains dual wavelength composition is advanced along the phase matching direction of one of them wavelength laser after the incident end face of this frequency doubling device of normal incident of incident end face, the party, is upwards converted into corresponding frequency doubled light; When arriving the reflection end face of crystal, reflect, the direction of propagation of laser beam changes, and the phase matching direction of this direction and another wavelength laser is matched, and in this one-phase, corresponding laser produces frequency multiplication and transforms.By these a series of processes, the dual-wavelength laser of input is converted into corresponding frequency doubled light in each self-corresponding phase matching direction, and the laser beam that finally comprises multi-wavelength composition leaves frequency doubling device from outgoing end face.Two wavelength in the dual-wavelength laser of incident are the different phase matching direction of correspondence respectively, generally these two phase matching directions can be just not vertical, so the angle between them is an obtuse angle and an acute angle, can derive thus different device designs.
Concrete technology path of the present invention is:
1, its structure as shown in Figure 1, 2, according to dual-wavelength laser wavelength and frequency-doubling crystal kind, calculate their corresponding multiple frequency phase matching directions, determine according to this cut type and the correlation parameter of dual-wavelength laser frequency doubling device, after making dual-wavelength laser enter this frequency doubling device, can pass through successively these two phase matching directions, obtain corresponding dual wavelength frequency double light output.
2, its structure as shown in Figure 5, according to dual-wavelength laser wavelength and frequency-doubling crystal kind, calculate their corresponding multiple frequency phase matching directions, determine according to this cut type and the correlation parameter of dual-wavelength laser frequency doubling device, after making dual-wavelength laser enter this frequency doubling device, can pass through successively these two phase matching directions, obtain corresponding dual wavelength frequency double light output.Laser beam extends the frequency multiplication conversion length of laser beam in this device by the multiple reflections of device side, thereby improves frequency multiplication transformation efficiency.
3, laser freuqency doubling actuating medium is nonlinear optical crystal.
One of preferred version of the present invention is: select reflection end face, blunt bisector of angle folded between its phase matching direction corresponding with two wavelength is overlapped, laser beam is propagated along this both direction, and the angle before reflection and between the path of passing through after reflection is acute angle.The plane projection of the device of this conceptual design is as shown in Fig. 1, wherein: 1 is nonlinear optical crystal; The laser beam that 2 representatives contain dual wavelength composition; 3, i.e. light path A, the phase matching direction of the laser of indicating one of them wavelength in this crystal, is also that laser beam enters initial round after crystal simultaneously; 4, light path B, is the direction of laser beam after 6 reflections of crystal reflection end face, and the phase matching direction with another wavelength laser in this crystal is corresponding; The 5th, emitting laser light beam, comprises unconverted dual-wavelength laser composition and their frequency doubled light; The 6th, the reflection end face of crystal, plays the effect of reflection, can plate corresponding total reflection film as required, if the incident angle of laser beam is enough large, due to the total reflection effect at interface, this end face also can be without plated film; 7 is laser beam incident end face; The 8th, the outgoing end face of laser beam; α has represented the angle between laser beam travel path 3 and 4, is also in this crystal folded acute angle between two each self-corresponding phase matching directions of wavelength laser.The dual wavelength comprising according to laser beam and the performance parameter of nonlinear optical crystal, calculate the phase matching angle of each wavelength correspondence in nonlinear optical crystal, by space geometry, determine the plane at these two phase matching direction places and folded sharp angle α between them, determine according to this direction and the geometric shape of crystal processing, cut out frequency doubling device as shown in Figure 1.The normal direction of the end face 7,8 of device overlaps with phase matching direction 3,4 respectively, to reduce the impact of refraction on laser beam, make fundamental frequency light and frequency doubled light keep overlapping as far as possible, and can on two end faces, plate respectively as required the deielectric-coating that can reduce laser loss.If the laser beam 2 being comprised of two wavelength a, b incides on the incident end face 7 of nonlinear optical crystal 1 along the normal of incident end face, light beam keeps the direction of propagation constant after entering crystal, along light path 3, propagate, now this direction meets the phase-matching condition of wavelength a, in traveling process, be converted to corresponding frequency doubled light, so and wavelength b does not meet phase-matching condition and frequency multiplication does not occur transforms.When laser beam arrives the reflection end face 6 of device 1, due to the total reflection effect occurring on the reflection of total reflection film of plating on reflection end face 6 or interface (incident angle enough greatly time), the laser beam direction of propagation is changed in direction 4, this direction can meet the phase-matching condition of wavelength b, the laser that now wavelength is b produces frequency-doubled effect and obtains corresponding frequency doubled light, at the process medium wavelength a advancing along this direction, frequency multiplication will not occur and transform.Outgoing when laser beam arrives the outgoing end face 8 of device 1, from device, the wavelength that frequency multiplication transforms does not occur is fundamental frequency light and their the corresponding frequency doubled lights of a, b by comprising for laser beam 5 out.
According to design needs, the frequency doubling device of this programme is improved and makes it have two reflection end faces, as shown in Figure 2, except original reflection end face 6, on end face 8, plate total reflection film 9, also become reflection end face, the Output of laser light beam 5 finally obtaining is along the reverse outgoing of incident direction, in figure in order to describe more clearly, laser beam 5 and the laser beam 2 of incident are separated, actual both overlap, are that the direction of propagation is contrary, end face 7 be incident end face be also outgoing end face.Before dual-wavelength laser light beam arrives reflection end face 8, the propagation of laser is as shown in Figure 1, when laser beam arrives after reflection end face 8, because total reflection film 9 reflects the frequency doubled light of dual-wavelength laser and their correspondences completely, make the light of all wavelengths all along original optical path negative line feed.While returning, during through the corresponding phase matching direction of b wavelength, b wavelength laser continues frequency multiplication and transforms.After light beam is again by reflection end face 6, be folded to the phase matching direction that a wavelength is corresponding, a wavelength laser starts to be again converted into corresponding frequency doubled light.Finally, the laser beam 5 that comprises basic frequency laser and frequency doubled light passes through end face 7 outgoing again, through end face 7 emitting lasers, can by one anti-reflection to fundamental frequency light, the high 45 anti-degree reflector plates of frequency doubled light are exported.
One of preferred version of the present invention is: select reflection end face, sharp bisector of angle folded between its phase matching direction corresponding with two wavelength is overlapped, laser beam is propagated along this both direction, and the angle before reflection and between the path of passing through after reflection is obtuse angle.The plane projection of the device of this conceptual design as shown in Figure 3, wherein: 1 is nonlinear optical crystal; The laser beam that 2 representatives contain dual wavelength composition; 3 one of them wavelength of the indication phase matching direction of laser in this crystal that be a is also that laser beam enters initial round after crystal simultaneously; The 4th, the direction of laser beam after 6 reflections of crystal reflection end face, the phase matching direction of the laser that is b with another wavelength in this crystal is corresponding; The 5th, emitting laser light beam, comprises unconverted dual-wavelength laser composition and their frequency doubled light; The 6th, the reflection end face of crystal, suitable large of incident angle from design can find out that laser beam incides this end face time easily forms total reflection on this interface, directly it propagated laser beam reflection along direction 4; 7 is laser beam incident end face, the 8th, and the outgoing end face of laser beam, these two end faces can be designed to plane, cambered surface or sphere as required; α has represented the ，Wei Yi obtuse angle, supplementary angle of the angle between laser beam travel path 3 and 4.According to designing identical rule with Fig. 1, determine direction and the geometric shape of crystal processing, cut out frequency doubling device as shown in Figure 3.The normal direction of the end face 7,8 of device overlaps with phase matching direction 3,4 respectively, to reduce the impact of refraction on laser beam, make fundamental frequency light keep overlapping with the direction of propagation of frequency doubled light as far as possible, on two end faces, plate respectively the deielectric-coating that can meet the demands as required, the loss of incident light and emergent light is reduced.Comprise two wavelength a, b laser beam 2 incides on the incident end face 7 of nonlinear optical crystal 1 along the normal of incident end face, light beam keeps the direction of propagation constant after entering crystal, along light path 3, propagate, it is that the laser of a meets phase-matching condition that the party upwards only has wavelength, in traveling process, it is converted to corresponding frequency doubled light, and frequency multiplication conversion does not occur wavelength b.When laser beam is after reflection end face 6 reflection of device 1, the laser beam direction of propagation changes in direction 4, and it is that the condition that the laser of b forms phase matching obtains corresponding frequency doubled light that this direction also only meets wavelength, and wavelength a does not change.Outgoing when laser beam arrives the outgoing end face 8 of device 1, from device, the wavelength that frequency multiplication transforms does not occur is fundamental frequency light and their the corresponding frequency doubled lights of a, b by comprising for laser beam 5 out.
In the design basis of Fig. 3, with reference to Fig. 2, it is done to equivalent modifications, as shown in Figure 4, the deielectric-coating 9 of plating to laser beam total reflection on end face 8, make laser beam along incident path backpropagation, finally on the circuit 5 with incident direction 2 overlaps, the direction of propagation is contrary, obtain output, for convenience, Output of laser light beam 5 use dotted lines independently mark.End face 7 be input end face be also output end face.Dual-wavelength laser beam propagation oppositely before, the propagation of laser is still as described in Fig. 3.When laser beam arrives after reflection end face 8, because total reflection film 9 is by the frequency doubled light of dual-wavelength laser and their correspondences is reflected completely, make the light of all wavelengths all along original optical path negative line feed.While returning, during through the corresponding phase matching direction of b wavelength, b wavelength laser continues frequency multiplication and transforms.After light beam is again by reflection end face 6, be folded to the phase matching direction that a wavelength is corresponding, a wavelength laser starts to be again converted into corresponding frequency doubled light.Finally, the light beam that comprises basic frequency laser and frequency doubled light passes through end face 7 outgoing again.Through end face 7 emitting lasers, can to fundamental frequency light is anti-reflection, to the high 45 anti-degree reflector plates of frequency doubled light, export by one.
In aforesaid two schemes, in order to improve the transformation efficiency of dual-wavelength laser, reflection end face can be taked plane or curved surface.
One of preferred version of the present invention is: according to basic mentality of designing, adopt suitable geometry to cut shape, cut out reflecting surface group, make laser beam multiple reflections by reflecting surface group in frequency doubling device extend its effective frequency multiplication conversion length to improve frequency multiplication transformation efficiency.Designed according to this kind of dual-wavelength laser frequency doubling device, as shown in Figure 5, wherein 1 is nonlinear optical crystal in plane projection; The laser beam that 2 representatives contain dual wavelength composition; 3,4, that is light path A, B, indicating respectively wavelength is the laser of a, the b phase matching direction in this crystal; The 5th, emitting laser light beam, the frequency doubled light that comprises unconverted dual-wavelength laser composition a, b and their correspondences; The 6th, the reflecting surface of crystal bottom, 9 and 10 is reflectings surface of crystal on side face, they can plate corresponding deielectric-coating according to designing requirement; 7 is laser beam incident end face, the 8th, the outgoing end face of laser beam, the normal direction of end face 7,8 overlaps with phase matching direction 3,4 respectively, to reduce the impact of refraction on laser beam, make fundamental frequency light and frequency doubled light keep overlapping as far as possible, and can on two end faces, plate respectively deielectric-coating as required.; α and β have represented the angle between laser beam travel path 3 and 4, are also the angle between two each self-corresponding phase matching directions of wavelength laser a, b in this crystal.Laser beam 2 incides on the incident end face 7 of nonlinear optical crystal 1 along the normal of incident end face, light beam keeps the direction of propagation constant after entering crystal, along light path 3, propagate, now this direction meets the phase-matching condition of wavelength a, in traveling process, be converted to corresponding frequency doubled light, so and wavelength b does not meet phase-matching condition and frequency multiplication does not occur transforms.When laser beam arrives device 1, wherein by reflecting its direction of propagation, change during the reflecting surface 9 of a side, make it to advance along light path 4, it is that the laser generation frequency-doubled effect of b obtains corresponding frequency doubled light that the phase-matching condition that this direction can meet wavelength b makes wavelength.When light beam advances to reflection during end face 6, oppositely again the changing of laser beam, advances along the direction that meets wavelength a and carry out phase matching, until the reflecting surface 10 of incident device opposite side.From end face 10 emitting laser light beams, forward again light path 4 final outgoing end face 8 outgoing from this frequency doubling device to.In this improvement project, by the multiple reflections of laser beam different end faces in this frequency doubling device, effectively extended the length that laser freuqency doubling transforms, can effectively utilize crystal, improve the frequency multiplication transformation efficiency of laser.The same with Fig. 4 with Fig. 2, can will on the end face of this frequency doubling device 8, plate total reflection film, laser beam is returned after end face 8, finally from end face 7 outgoing along original optical path.
According to this, this device length can be lengthened to (as shown in Figure 6) by the cycle, make laser beam multiple reflections on the reflecting surface 9,10 of device both sides, improve the periodicity of propagating, make laser beam can be converted into more fully frequency doubled light.
In order to improve the transformation efficiency of dual-wavelength laser, reflection end face can be taked the combination of some planes or some curved surfaces.
Dual wavelength frequency double quartz crystal device in the design, is the single device being processed into by a nonlinear optical crystal, has following essential characteristic:
1. according to the wavelength of dual-wavelength laser, calculate the angular bisector of angle between the phase matching direction, this both direction of their corresponding frequencys multiplication in nonlinear optical crystal and take the reflecting surface that this angular bisector is normal, determine according to this cut type and the correlation parameter of this device, after making dual-wavelength laser enter this frequency doubling device by reflecting surface, can pass through successively these two phase matching directions, obtain corresponding dual wavelength frequency double light output.
2. as shown in 1, described reflecting surface is plane or curved surface.
The operable nonlinear optical crystal of device described in 3.1 is KTP, KDP, BBO, KBBF, LBO, KTA, ATP, KDA, KBO, CTA, CGS or AGS crystal.
4. according to the angular bisector of angle between the phase matching direction of their corresponding frequencys multiplication in nonlinear optical crystal of wavelength calculating of dual-wavelength laser and this both direction, take face that this angular bisector is normal and the side of device forms reflecting surface group, determine cut type and the correlation parameter of device, the direction of propagation that dual-wavelength laser is entered after this frequency doubling device by reflecting surface group remains in these two phase matching directions, thereby extend the frequency multiplication of dual-wavelength laser in frequency doubling device and transform length, improve frequency multiplication transformation efficiency, obtain corresponding dual wavelength frequency double light output.
5. the laser frequency-doubling device as described in 4, its reflecting surface group is the combination of plane or curved surface.
The operable nonlinear optical crystal of device described in 6.4 is KTP, KDP, BBO, KBBF, LBO, KTA, ATP, KDA, KBO, CTA, CGS or AGS crystal.
Accompanying drawing explanation
Fig. 1, dual-wavelength laser frequency doubling device schematic diagram;
Fig. 2, through two reflection end faces dual-wavelength laser frequency doubling device schematic diagram
Another of Fig. 3, dual-wavelength laser frequency doubling device cut shape schematic diagram;
A kind of modification of Fig. 4, dual-wavelength laser frequency doubling device;
The schematic diagram of Fig. 5, a kind of improved dual-wavelength laser frequency doubling device;
The schematic diagram of the dual-wavelength laser frequency doubling device of Fig. 6, the reflection of a kind of multicycle.
Embodiment
1,1064nm and 1338nm dual wavelength KTP laser frequency-doubling device
Using ktp crystal as laser freuqency doubling medium, by calculate can obtain 1064nm and 1338nm laser respectively corresponding phase matching direction be (θ=90 °, Φ=23.6 °) and (θ=59.0 °, Φ=0 °), by this both direction, determine device parameters, according to Fig. 1, Fig. 2, process two dual-wavelength laser frequency doubling devices respectively.By 1064nm and these two dual-wavelength laser frequency doubling devices of 1338nm dual-wavelength laser difference incident, laser all obtains frequency doubled light after by these two devices and exports, through reflective gratings monochromator, measure, prove that the frequency doubled light obtaining all comprises 532nm and 669nm composition in these two devices.
2,1064nm and 1319nm dual wavelength KTP laser frequency-doubling device
Using ktp crystal as laser freuqency doubling medium, by calculate can obtain 1064nm and 1319nm laser respectively corresponding phase matching direction be (θ=90 °, Φ=23.6 °) and (θ=59.8 °, Φ=0 °), by this both direction, determine device parameters, according to Fig. 1, Fig. 2, process two dual-wavelength laser frequency doubling devices respectively.By 1064nm and these two dual-wavelength laser frequency doubling devices of 1338nm dual-wavelength laser difference incident, laser all obtains frequency doubled light after by these two devices and exports, through reflective gratings monochromator, measure, prove that the frequency doubled light obtaining all comprises 532nm and 659.5nm composition in these two devices.
3,1064nm and 1338nm dual wavelength KDP laser frequency-doubling device
Using KDP crystal as laser freuqency doubling medium, by calculate can obtain 1064nm and 1338nm laser respectively corresponding phase matching direction be θ=59.0 ° and θ=62.6 °, by this both direction, determine device parameters, according to Fig. 1, Fig. 2, process two dual-wavelength laser frequency doubling devices respectively.By 1064nm and these two dual-wavelength laser frequency doubling devices of 1338nm dual-wavelength laser difference incident, laser all obtains frequency doubled light after by these two devices and exports, through reflective gratings monochromator, measure, prove that the frequency doubled light obtaining all comprises 532nm and 669nm composition in these two devices.
4,1064nm and 1338nm dual wavelength BBO laser frequency-doubling device
Using bbo crystal as laser freuqency doubling medium, by calculate can obtain 1064nm and 1338nm laser respectively corresponding phase matching direction be θ=22.9 ° and θ=20.3 °, by this both direction, determine device parameters, according to Fig. 1, Fig. 2, process two dual-wavelength laser frequency doubling devices respectively.By 1064nm and these two dual-wavelength laser frequency doubling devices of 1338nm dual-wavelength laser difference incident, laser all obtains frequency doubled light after by these two devices and exports, through reflective gratings monochromator, measure, prove that the frequency doubled light obtaining all comprises 532nm and 669nm composition in these two devices.
5,1064nm and 1338nm dual wavelength KBBF laser frequency-doubling device
Using KBBF crystal as laser freuqency doubling medium, by calculate can obtain 1064nm and 1338nm laser respectively corresponding phase matching direction be θ=19.9 ° and θ=18.8 °, by this both direction, determine device parameters, according to Fig. 1, Fig. 2, process two dual-wavelength laser frequency doubling devices respectively.By 1064nm and these two dual-wavelength laser frequency doubling devices of 1338nm dual-wavelength laser difference incident, laser all obtains frequency doubled light after by these two devices and exports, through reflective gratings monochromator, measure, prove that the frequency doubled light obtaining all comprises 532nm and 669nm composition in these two devices.
6, improved 1064nm and 1338nm dual wavelength KTP laser frequency-doubling device
Using ktp crystal as laser freuqency doubling medium, by calculate can obtain 1064nm and 1338nm laser respectively corresponding phase matching direction be (θ=90 °, Φ=23.6 °) and (θ=59.0 °, Φ=0 °), by this both direction, determine device parameters, according to Fig. 5, process dual-wavelength laser frequency doubling device.By 1064nm and this dual-wavelength laser frequency doubling device of 1338nm dual-wavelength laser incident, laser obtains frequency doubled light after by device and exports, and through reflective gratings monochromator, measures, and proves that the frequency doubled light obtaining is 532nm and 669nm.
Claims (5)
1. a dual-wavelength laser frequency doubling device, by monolithic nonlinear optical crystal, processed, it is characterized in that: nonlinear optical crystal (1) comprises a plane of incidence (7), a reflecting surface (6) and an exit facet (8), the normal direction of the plane of incidence (7) and exit facet (8) is respectively along dual-wavelength laser medium wavelength a, b realizes the corresponding phase matching direction of frequency-doubled effect, the normal of reflecting surface (6) is the bisector of the angle α of the plane of incidence (7) and (8) two normals compositions of exit facet, dual-wavelength laser is first propagated along phase matching direction corresponding to wavelength a after entering this frequency doubling device by the plane of incidence (7), by the mirror-reflection effect of reflecting surface (6), transfer and propagate along phase matching direction corresponding to wavelength b again, finally from exit facet (8), leave device, obtain dual wavelength frequency double light (5) output.
2. a dual-wavelength laser frequency doubling device, by monolithic nonlinear optical crystal, processed, it is characterized in that: nonlinear optical crystal (1) comprises a plane of incidence (7), a reflecting surface (6), an exit facet (8) and two offside reflection faces (9, 10), the normal direction of the plane of incidence (7) and exit facet (8) is respectively along dual-wavelength laser medium wavelength a, b realizes the corresponding phase matching direction of frequency-doubled effect, the normal of reflecting surface (6) is the bisector of the angle α of the plane of incidence (7) and (8) two normals compositions of exit facet, two offside reflection faces (9, 10) normal is the bisector of another angle β of the plane of incidence (7) and (8) two normals compositions of exit facet, dual-wavelength laser is first propagated along phase matching direction corresponding to wavelength a after entering this frequency doubling device by the plane of incidence (7), by the mirror-reflection effect of one of them offside reflection face (9), transfer along propagating in phase matching direction corresponding to wavelength b, mirror-reflection by reflecting surface (6) forwards the corresponding phase matching direction propagation along wavelength a to again, then by after the mirror-reflection of another offside reflection face (10), along the phase matching direction that wavelength b is corresponding, from exit facet (8), leave device, obtain dual wavelength frequency double light (5) output.
3. laser frequency-doubling device as claimed in claim 1 or 2, is characterized in that: described nonlinear optical crystal is KTP, KDP, BBO, KBBF, LBO, KTA, ATP, KDA, KBO, CTA, CGS or AGS crystal.
4. laser frequency-doubling device as claimed in claim 1 or 2, is characterized in that: the plane of incidence of device (7) and exit facet (8) plate the deielectric-coating that can reduce laser loss according to the needs of dual-wavelength laser.
5. laser frequency-doubling device as claimed in claim 2, is characterized in that: the reflecting surface of device (6), two offside reflection faces (9,10) plate corresponding deielectric-coating according to the requirement of dual-wavelength laser.
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| US6215580B1 (en) * | 1997-11-26 | 2001-04-10 | Nec Corporation | Wavelength converter for generating optical harmonics of incident laser light at high efficiency and method for varying wavelength of incident laser light |
| CN1459894A (en) * | 2002-05-21 | 2003-12-03 | 中国科学院福建物质结构研究所 | Double wave length neodymium laser outercavity frequency multiplier sum frequency red green blue three basic eotour laser |
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