CN101308988B - Sum-frequency laser - Google Patents
Sum-frequency laser Download PDFInfo
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- CN101308988B CN101308988B CN2008100986138A CN200810098613A CN101308988B CN 101308988 B CN101308988 B CN 101308988B CN 2008100986138 A CN2008100986138 A CN 2008100986138A CN 200810098613 A CN200810098613 A CN 200810098613A CN 101308988 B CN101308988 B CN 101308988B
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Abstract
Disclosed is a sum-frequency laser device whose composite intra-cavity is structured by two branch optical channel arms and an optical coupling arm; wherein, one of the branch optical channel arms is provided with a laser pump system and a pump laser coupling system, a front cavity flake and a laser amplifying medium sequentially arranged at the pump laser transmitting direction; the other of the branch optical channel arms is also provided with a laser pump system and a pump laser coupling system, a front cavity flake and a laser amplifying medium sequentially arranged at the pump laser transmitting direction; a beam separation and coupling component, a sum-frequency crystal and a cavity output mirror are sequentially arranged on the optical coupling arm. The beam separation and coupling component of the invention is a birefringence crystal prism; the cavity output mirror is a rear cavity flake. The sum-frequency laser device of the invention uses two groups of laser amplifying medium, frequency doubling crystal and birefringence crystal prism to form the composite intra-cavity of the sum-frequency laser, and utilizes the birefringence effect of the birefringence crystal prism to make the birefringence crystal prism as the beam separation and coupling component; thereby effectively increases the efficiency of the sum-frequency laser with less losses brought to the intra-cavity. Only arranging one cavity output mirror makes the structure relatively simple.
Description
Technical field
The present invention relates to a kind of laser, refer to the laser of the Compound Cavity structure of a kind of acquisition and frequency laser output especially.
Background technology
With frequency laser in, polarization beam splitting eyeglass commonly used or PBS eyeglass are as Compound Cavity deciliter bundle element.Because polarization beam splitting eyeglass or PBS eyeglass are coated with media coating, will produce certain loss to oscillating laser, are unfavorable for the raising with frequency laser efficient.One document number is that the invention inventive applicant specification of CN17310633A discloses all solid state Compound Cavity of a kind of semiconductor laser pumping and frequency laser, place optical coupling system, reflecting cavity mirror, gain medium, light combination mirror and frequency crystal from left to right successively in the laser beam direction of propagation of pumping, two output coupling cavity mirrors; The normal of light combination mirror becomes the θ angle to install with systematic optical axis, a reflecting cavity mirror and a back output coupling cavity mirror are formed a sub resonant cavity; In the left side of light combination mirror normal another arm light path is housed, optical axis points to the light combination mirror center, places optical coupling system, reflecting cavity mirror, gain medium, light combination mirror from right to left successively in the laser beam direction of propagation of pumping; Pre-output coupling cavity mirror in reflecting cavity mirror, light combination mirror and the last light path is formed another sub resonant cavity.The high anti-or high antireflection film that is coated with on request fundamental frequency light and frequency laser about each part is.Should have two independently output coupling cavity mirror and sheet light combination mirrors that adopt ordinary optical glass to make with frequency laser, and cause the Compound Cavity internal loss higher, particularly insert loss, thereby laser pumping efficient and low with the frequency optical output power.
Summary of the invention
The technical problem to be solved in the present invention is: at the problem that above-mentioned and frequency laser exists, design a kind of pumping efficiency high and simple in structure and frequency laser.
Technical scheme of the present invention is: a kind of and frequency laser, its Compound Cavity close the arm light path by two arm light path and one and constitute; Wherein arm light path is provided with laser pumping system and the pump light coupled system that sets gradually along the pump light direction of propagation, ante-chamber sheet, gain medium, is provided with laser pumping system and the pump light coupled system that sets gradually along the pump light direction of propagation, ante-chamber sheet, gain medium on another arm light path equally; Close and be provided with deciliter bundle element and frequency crystal and output coupling cavity mirror on the arm light path successively; It is characterized in that: described deciliter bundle element is the birefringece crystal prism.
Output coupling cavity mirror of the present invention is a back cavity sheet.
Compare with prior art, the invention has the beneficial effects as follows: the present invention is made of and the frequency laser Compound Cavity two groups of gain mediums, frequency-doubling crystal and birefringece crystal prism, utilize birefringece crystal prism birefringence effect to make it as Compound Cavity deciliter bundle element, the introducing cavity loss is less, favourable raising and frequency laser efficient; Only establish an output coupling cavity mirror, structure is simple relatively.In addition, the present invention can also make microchip and frequency laser, helps the miniaturization and the application of low-power and frequency laser.
Description of drawings
Fig. 1 is the first embodiment of the invention structural representation;
Fig. 2 a is deciliter bundle component structure schematic diagram that first embodiment of the invention adopted;
Fig. 2 b is deciliter bundle component structure schematic diagram that second embodiment of the invention adopted;
Fig. 2 c is deciliter bundle component structure schematic diagram that third embodiment of the invention adopted;
Fig. 3 a is the fourth embodiment of the invention structural representation;
Fig. 3 b is the fifth embodiment of the invention structural representation.
Embodiment
As shown in Figure 1, the present invention and frequency laser Compound Cavity are closed the arm light path by two crossing arm light path and one and are constituted; Pump light coupled system 102A, ante-chamber sheet 103A, gain medium 104A that arm light path is provided with the laser pumping system and sets gradually along the pump light direction of propagation wherein; The pump light coupled system 102B that is provided with the laser pumping system on another arm light path equally and sets gradually, ante-chamber sheet 103B, gain medium 104B along the pump light direction of propagation; Close and be provided with deciliter bundle element and frequency crystal 106 and output coupling cavity mirror on the arm light path successively.The described laser pumping employing semiconductor laser 101A of system, 101B, this semiconductor laser 101A, 101B generally adopt laser diode (LD) or its array of band metal sleeve.Pump light coupled system 102A, 102B generally adopt collimating lens, collimater or similar device.Ante-chamber sheet 103A, 103B plano-concave lens for adopting K9 optical glass to make.Gain medium 104A, 104B adopt Nd:YVO4, Nd:YAG or similar laser crystal, and gain medium 104A and gain medium 104B can adopt the laser crystal of identical type, also can adopt different types of laser crystal.Deciliter the bundle element be birefringece crystal prism 105, it is a triangle.Adopt LBO, BBO, KTP or similar non-linear and frequency crystal with frequency crystal 106.Output coupling cavity mirror is the plano-concave lens of back cavity sheet 107 for adopting K9 optical glass to make.Ante-chamber sheet 103A, the gain medium 104A on arm light path wherein, close on the arm light path with frequency crystal 106, back cavity sheet 107, and birefringece crystal prism 105 constitutes a laserresonator A, resonance produces fundamental frequency light λ 1; Ante-chamber sheet 103B, gain medium 104B on another arm light path, close on the arm light path with frequency crystal 106, back cavity sheet 107, and birefringece crystal prism 105 constitutes a laserresonator B, resonance produces fundamental frequency light λ 2.Fundamental frequency light λ 1, λ 2 with frequency crystal 106 in produce and light λ, wherein 1/ λ=1/ λ 1+1/ λ 2 frequently.Spacing between above-mentioned each part can be finely tuned.
As shown in Figure 2, the operation principle of birefringece crystal prism 105.Wherein the cross section of the birefringece crystal prism 105 shown in Fig. 2 a is an isosceles right triangle, the parallel triangle of its optical axis of crystal right angle face, when a branch of light when X-direction impinges perpendicularly on birefringece crystal prism 105, o light and e light all do not change direction in the incident light, when arriving the prism inclined-plane, o light still is o light after surface reflection, and it follows uniform dielectric total internal reflection law, be that incidence angle is θ, angle of reflection also is θ; This moment, e light transferred o light after reflection to, and it follows the law of refraction, i.e. neSin θ=noSin θ ', and θ ' ≠ θ works as o, when e light leaves crystal, is separated from each other with certain included angle, the birefringence effect of Here it is birefringece crystal prism.According to the light path principle of reversibility, e light is the right angle face oblique incidence of fundamental frequency light λ 1 from birefringece crystal prism 105, and o light is the right angle face vertical incidence of fundamental frequency light λ 2 from birefringece crystal prism 105.Fundamental frequency light λ 1 transfers o light to after the reflection of the inclined-plane of birefringece crystal prism 105, the vertical outgoing of another right angle face of closing Shu Houcong birefringece crystal prism 105 with fundamental frequency light λ 2.Warp and frequency crystal 106 are transformed into and frequency light λ exports from back cavity sheet 107.The present invention adopts the birefringece crystal prism as Compound Cavity deciliter bundle element, and it is less to introduce cavity loss, favourable raising and frequency laser efficient.
Birefringece crystal prism 105 shown in Fig. 2 b constitutes the prism group, all parallel its right angle face of the optical axis of two birefringence triangular prisms for the birefringence triangular prism that is isosceles right triangle by two cross sections.Two birefringence triangular prisms are located in the same vertical plane, and the last triangular prism size of just putting is less, and inverted the triangular prism size is bigger down.The fundamental frequency light λ 1, the λ 2 that are in the same vertical plane are parallel or approximate abreast from descending the vertical plane vertical incidence of triangular prism, and the conversion of following triangular prism of process and last triangular prism is successively also closed bundle.So just making e light is that fundamental frequency light λ 1 and o light are that fundamental frequency light λ 2 spaces separate, and is parallel to each other or approximate being parallel to each other.
Above embodiment is separate type and frequency laser.The present invention can also make microchip and frequency laser, this micro-slice laser Compound Cavity by gain medium and and frequently crystal is bonding or be glued on the birefringece crystal prism and constitute, its front/back cavity sheet then directly is plated in plane of crystal by deielectric-coating.Describe in detail below with reference to specific embodiment:
Shown in Fig. 3 a, two arm light path of present embodiment Compound Cavity are located at being in the same vertical plane of rhombus birefringece crystal prism 105 right sides abreast; , the arm light path pump light coupled system 102A, ante-chamber sheet, the gain medium 104A that are provided with the laser pumping system and are provided with along the pump light direction of propagation, the pump light coupled system 102B, ante-chamber sheet, the gain medium 104B that are provided with the laser pumping system on another arm light path equally and are provided with along the pump light direction of propagation; The right side that gain medium 104A, the 104B mode by optical cement or in-depth optical cement is located at birefringece crystal prism 105 is the position on the lower side; Ante-chamber sheet on two arm light path is located at the right side of gain medium 104A, 104B in the mode of plated film.Compound Cavity close on the arm light path with frequency crystal 106 also by optical cement or the in-depth optical cement mode be located at position on the upper side, birefringece crystal prism 105 left sides; The back cavity sheet also is located at and frequency crystal 106 left sides in the mode of plated film.The index path of present embodiment identical with shown in Fig. 2 c.The o light that laser cavity A produces is that fundamental frequency light λ 1 is that fundamental frequency light λ 2 closes bundle with the e light that laser cavity B produces, after and frequency crystal 106 is transformed into and light λ output frequently.
Shown in Fig. 3 b, two arm light path of present embodiment Compound Cavity are located at rhombus birefringece crystal prism 105 and arranged on left and right sides abreast and are in the same vertical plane; Pump light coupled system 102A, ante-chamber sheet, gain medium 104A that left side arm light path is provided with the laser pumping system and is provided with along the pump light direction of propagation, the pump light coupled system 102B, ante-chamber sheet, the gain medium 104B that are provided with the laser pumping system on the right arm light path equally and are provided with along the pump light direction of propagation; Gain medium 104A, 104B are located at the left and right end face of birefringece crystal prism 105 respectively by the mode of optical cement or in-depth optical cement; Ante-chamber sheet on the arm light path of a left side is located at gain medium 104A left side in the mode of plated film, and the ante-chamber sheet on the right arm light path is located at the right side of gain medium 104B in the mode of plated film.Compound Cavity close on the arm light path with frequency crystal 106 also by optical cement or the in-depth optical cement mode be located at position on the upper side, birefringece crystal prism 105 left sides; The back cavity sheet also is located at and frequency crystal 106 left sides in the mode of plated film.The quarter wave plate 107A that is in the same vertical plane with gain medium 104B also is located at the right side of birefringece crystal prism 105 by the mode of optical cement or in-depth optical cement, and this wave plate can transfer o light to e light.The e light that laser cavity A produces is the light path of fundamental frequency light λ 1: J → I → G → H → G → C → F, it converts o light to when promptly passing through wave plate 107A at the H place, e light in G place and laser cavity B generation is that fundamental frequency light λ 2 closes bundle then, after and frequency crystal 106 is transformed into and frequency light λ exports.So just gain medium can be located at two surfaces that are parallel to each other of birefringece crystal respectively, be that semiconductor laser 101A, 101B are provided with in the space and regulate to be easy to the laser pumping system.Microchip of the present invention and frequency laser are simple in structure, help low-power and frequency laser and obtain to use more widely.This micro-slice laser also can glue together the whole optical element that forms by semiconductor laser 101A, 101B pump-coupling (also claiming the end pump).
The present invention is made of and the frequency laser Compound Cavity two groups of gain mediums, frequency-doubling crystal and birefringece crystal prism, utilize birefringece crystal prism birefringence effect to make it as Compound Cavity deciliter bundle element, the introducing cavity loss is less, favourable raising and frequency laser efficient; Only establish an output coupling cavity mirror, structure is simple relatively.In addition, the present invention can also make microchip and frequency laser, helps the miniaturization and the application of low-power and frequency laser.
Claims (6)
1. one kind and frequency laser, its Compound Cavity close the arm light path by two arm light path and one and constitute; Wherein arm light path is provided with laser pumping system and the pump light coupled system that sets gradually along the pump light direction of propagation, ante-chamber sheet, gain medium, is provided with laser pumping system and the pump light coupled system that sets gradually along the pump light direction of propagation, ante-chamber sheet, gain medium on another arm light path equally; Close and be provided with deciliter bundle element and frequency crystal and output coupling cavity mirror on the arm light path successively; It is characterized in that: described deciliter bundle element is the birefringece crystal prism, and described birefringece crystal prism constitutes the prism group, all parallel its right angle face of the optical axis of two birefringence triangular prisms for the birefringence triangular prism that is isosceles right triangle by two cross sections; These two birefringence triangular prisms are located in the same vertical plane, and the last triangular prism size of just putting is less, and inverted the triangular prism size is bigger down; The fundamental frequency light λ 1, the λ 2 that are in the same vertical plane are parallel or approximate abreast from descending the vertical plane vertical incidence of triangular prism, and the conversion of following triangular prism of process and last triangular prism is successively also closed bundle.
2. one kind and frequency laser, its Compound Cavity close the arm light path by two arm light path and one and constitute; Wherein arm light path is provided with laser pumping system and the pump light coupled system that sets gradually along the pump light direction of propagation, ante-chamber sheet, gain medium, is provided with laser pumping system and the pump light coupled system that sets gradually along the pump light direction of propagation, ante-chamber sheet, gain medium on another arm light path equally; Close and be provided with deciliter bundle element and frequency crystal and output coupling cavity mirror on the arm light path successively; It is characterized in that: described deciliter bundle element is the birefringece crystal prism, and described birefringece crystal prism is that a cross section is the birefringece crystal prism of rhombus; Be in same vertical plane interior fundamental frequency light λ 1, λ 2 abreast from the vertical plane vertical incidence of rhombic prism, successively also close bundle through two inclined-planes conversions of rhombic prism.
3. according to claim 2 and frequency laser is characterized in that: described Compound Cavity is for by gain medium with and crystal is bonding or be glued at the microchip Compound Cavity that constitutes on the birefringece crystal prism frequently.
4. according to claim 3 and frequency laser, it is characterized in that: two arm light path of described microchip Compound Cavity are located at being in the same vertical plane of rhombus birefringece crystal prism right side abreast; , the arm light path pump light coupled system, ante-chamber sheet, the gain medium that are provided with the laser pumping system and are provided with along the pump light direction of propagation, the pump light coupled system, ante-chamber sheet, the gain medium that are provided with the laser pumping system on another arm light path equally and are provided with along the pump light direction of propagation; Gain medium on two arm light path right side that bonding or in-depth optical cement bonding mode is located at the birefringece crystal prism by optical cement is the position on the lower side; Ante-chamber sheet on two arm light path is located at the right side of gain medium in the mode of plated film; Compound Cavity close on the arm light path also bonding or in-depth optical cement bonding mode is located at position on the upper side, birefringece crystal prism left side by optical cement with the frequency crystal; The back cavity sheet also is located at and frequency crystal left side in the mode of plated film.
5. according to claim 3 and frequency laser, it is characterized in that: two arm light path of described microchip Compound Cavity are located at rhombus birefringece crystal prism and arranged on left and right sides abreast and are in the same vertical plane; Pump light coupled system, ante-chamber sheet, gain medium that left side arm light path is provided with the laser pumping system and is provided with along the pump light direction of propagation, the pump light coupled system, ante-chamber sheet, the gain medium that are provided with the laser pumping system on the right arm light path equally and are provided with along the pump light direction of propagation; Bonding or in-depth optical cement bonding mode is located at the left and right end face of birefringece crystal prism respectively to gain medium on two arm light path by optical cement; Ante-chamber sheet on the arm light path of a left side is located at gain medium (104A) left side in the mode of plated film, and the ante-chamber sheet on the right arm light path is located at the right side of gain medium (104B) in the mode of plated film; Compound Cavity close on the arm light path also bonding or in-depth optical cement bonding mode is located at position on the upper side, birefringece crystal prism left side by optical cement with the frequency crystal; The back cavity sheet also is located at and frequency crystal left side in the mode of plated film; Be in the right side that the interior quarter wave plate of same vertical plane mode also bonding by optical cement or that the in-depth optical cement is bonding is located at the birefringece crystal prism with gain medium (104B).
6. according to claim 1 and 2 and frequency laser, it is characterized in that: described output coupling cavity mirror is a back cavity sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100986138A CN101308988B (en) | 2008-05-30 | 2008-05-30 | Sum-frequency laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100986138A CN101308988B (en) | 2008-05-30 | 2008-05-30 | Sum-frequency laser |
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| CN101308988A CN101308988A (en) | 2008-11-19 |
| CN101308988B true CN101308988B (en) | 2011-04-06 |
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| CN2008100986138A Expired - Fee Related CN101308988B (en) | 2008-05-30 | 2008-05-30 | Sum-frequency laser |
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| CN104990872B (en) * | 2015-06-22 | 2017-11-28 | 清华大学 | Lubricate the measurement apparatus of interface and frequency signal |
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Granted publication date: 20110406 Termination date: 20170530 |