CN100356639C - 45 deg. oblique axis pumping method and pumping module for strip shaped laser crystal - Google Patents
45 deg. oblique axis pumping method and pumping module for strip shaped laser crystal Download PDFInfo
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- CN100356639C CN100356639C CNB2005100596010A CN200510059601A CN100356639C CN 100356639 C CN100356639 C CN 100356639C CN B2005100596010 A CNB2005100596010 A CN B2005100596010A CN 200510059601 A CN200510059601 A CN 200510059601A CN 100356639 C CN100356639 C CN 100356639C
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Abstract
The present invention relates to a pumping method and a pumping module for an oblique axis of 45 degrees for a laser crystal in the shape of a plate strip, which belongs to the technical field of a laser technology. The present invention combines the advantages of a parallel light axis pumping mode and a vertical light axis pumping mode, and then, the present invention provides a pumping method and a pumping module for an oblique axis of 45 degrees for a laser crystal in the shape of a plate strip. Because pumping light is zigzag propagated in a crystal, the pumping uniformity is ensured, and the pumping light can be fully absorbed by a laser crystal; thus, the present invention is suitable for solid laser materials with low absorption coefficients and good quality requirements of output beams. In addition, bicolor films with high damage threshold values do not need to be coated on two side surfaces of 45 degrees of the laser crystal, the full reflection is realized within 45 degrees, and thus, the loss of interface reflection and the cost of the laser crystal can be effectively reduced. The coupling surface of the pumping light of 45 degrees cutting causes the pumping coupling surface to be enlarged by 1.4 times; thus, much pumping light can be coupled in the coupling surface, the pumping power density is increased, and a laser diode pumping solid laser with high efficiency can be designed easily.
Description
Technical field
The present invention relates to a kind of 45 ° of oblique axis pumping methods and pump module that is used for strip shaped laser crystal, belong to laser technology field.
Background technology
Two kinds of main pumping coupled modes one parallel optical axis pumpings of laser diode pump solid state laser device at present and vertical optical axis pumping.Wherein the parallel optical axis pumping is meant that the pumping optical axis is parallel to the pumping coupled modes of laser emitting optical axis; The vertical optical axis pumping is meant the pumping coupled modes of pumping optical axis perpendicular to the laser emitting optical axis.These two kinds of pumping couplings and mode respectively have its pluses and minuses.In the parallel optical axis pumping, the pattern matching of pump light and laser is relatively good, and light extraction efficiency and beam quality be all than higher, but is subjected to the restriction of plane of incidence optical power density, and power expansion is restricted; Though vertical optical axis pumping power expansion is relatively good, but because absorption coefficient, the pumping light intensity is along with the incident degree of depth is pressed index law decline, even adopt the bilateral pump mode, also be difficult to change on the laser generation cross section, the regional pump light higher in the both sides loss is stronger; In the lower more weak situation of regional pump light of middle loss.The pattern matching of pump light and laser is bad, and pumping is inhomogeneous.Caused the output laser beam quality poor, drawback such as efficient is lower.In order to eliminate influence in the pumping inhomogeneities of lath thickness direction, improve the beam quality of laser on this direction, in the slab laser structure widespread usage zigzag of laser generation (Zig-Zag) light path.Relevant patent has: 4,127,827; 4,852,109; 5,271,031; 5,305,345; 5,646,773; 5,651,021; 6,094,297 etc. (U.S.), but this method is too high to the optics processing request of laser crystal, and can only compensate the thermal lensing effect of a direction.Patent 6,094,297 (U.S.) are though done some and improved, and the corner cut by crystal has converted the vertical optical axis pumping to the parallel optical axis pumping.But because the restriction of structure, with still not enough to the lower solid laser material pump power density of absorption coefficient.For this reason, Chinese patent 02129485.2 (applying date is on August 23rd, 2002) has been developed a kind of angle pump technology, and the solid laser material lower to absorption coefficient can reach higher pump power density.But this scheme needs four jiaos of pumpings, four sides bonding, complex process; Around on eight facets the plated film of neither one adjacent surface be identical, and major part is Double-color film, so the coating process complexity is with high costs.All pump modes all can be summed up or approximate parallel optical axis pumping, vertical optical axis pumping and the angle pumping configuration of being summed up as, do not have an example proposition or adopted pump light to be coupled into laser crystal from the two ends of laser crystal, and pump light and laser emitting optical axis were both not parallel, and out of plumb forms the zigzag pumping light path of approximate 45 degree again.
Summary of the invention
In order to overcome above-mentioned deficiency, this invention combines the advantage of parallel optical axis pumping and vertical optical axis pumping, has proposed to be used for the 45 ° of oblique axis pumping methods and the pump module of strip shaped laser crystal, and concrete technical scheme is as follows:
45 ° of oblique axis pumping methods that are used for strip shaped laser crystal, it is characterized in that: the end of strip shaped laser crystal is processed into and the vertical inclined-plane at 45 of laser crystal, make pump light be coupled into laser crystal by described 45 ° of inclined-planes, pump light is (Zig-Zag) propagation in a zigzag in laser crystal, the pumping laser crystal; In the pump light axial plane, the projection angle at 45 of described pumping optical axis and vibration/amplifying laser optical axis of injecting from the side.
A kind of input mode of vibration/amplifying laser is in said method: with two other lateral vertical cutting of described strip shaped laser crystal, make vibration/amplifying laser inject described vertical plane, by the inner total reflection on 45 ° of inclined-planes of described laser crystal, at the inner linear light path that forms of laser crystal.
The another kind of input mode of vibration/amplifying laser is in said method: two other side of described strip shaped laser crystal is cut into Brewster's angle, make vibration/amplifying laser inject described side with Brewster's angle, by the inner total reflection on 45 ° of inclined-planes of described laser crystal, in inner (Zig-Zag) light path in a zigzag that forms of laser crystal.
Implement the pump module of above-mentioned 45 ° of oblique axis pumping methods, comprise pump light source, leaded light awl and strip shaped laser crystal, it is characterized in that: the end of described strip shaped laser crystal is and the vertical inclined-plane at 45 of laser crystal, pump light source 4 is coupled into laser crystal 3 with pump light by described 45 ° of inclined-planes by leaded light awl 5, thus make pump light in laser crystal in a zigzag (Zig-Zag) propagate.
A kind of mode of the present invention is: two other side of described strip shaped laser crystal is the plane of perpendicular cuts, thereby makes the inner total reflection of laser by 45 ° of inclined-planes of described laser crystal of incident, at the inner linear light path that forms of laser crystal.
Another kind of the present invention is improved to: two other side of described strip shaped laser crystal is the side with Brewster's angle, thereby make the inner total reflection of laser by 45 ° of inclined-planes of described laser crystal of incident, in inner (Zig-Zag) light path in a zigzag that forms of laser crystal.
In the present invention, described laser crystal is made by dopant material; Perhaps described laser crystal middle section adopts dopant material to make, both sides or the plain material of bonding all around.
In the present invention, the low solid laser material of the preferred absorption coefficient of described dopant material.
In the present invention, described dopant material is preferably Yb:YAG, Tm:YAG, or the laser diode-pumped Nd:YAG of 885 μ m.
Because pump light is (Zig-Zag) propagation in a zigzag in laser crystal, guaranteed the uniformity of the pumping of pump light on this direction and to the abundant absorption of pump light, compensate the thermal lensing effect of this direction, so absorption coefficient lower solid laser material and the good beam quality of exporting light are required to have good applicability; Two 45 ° of sides of this of laser crystal do not need to plate the high damage threshold Double-color film in addition, and 45 ° of inner total reflections can effectively reduce the cost of boundary reflection loss and laser crystal; The pump light coupling surface of 45 ° of cuttings has also strengthened 1.4 times with the pumping coupling surface, thereby can be coupled into more pump light, has improved pump power density, helps improving the efficient of DPL laser.
Description of drawings
Fig. 1 adopts the optical schematic diagram of the pump module of straight-through light path for oscillating laser.
Fig. 2 adopts the optical schematic diagram of the pump module of light path in a zigzag for oscillating laser.
Fig. 3 a and Fig. 3 b are the inner optics partial enlarged drawing of laser generation/amplification light path in a zigzag of laser crystal among Fig. 2.
Fig. 4 is the optical schematic diagram of the pump module of the plain material of laser crystal both sides bonding.
Embodiment
Further describe the present invention below in conjunction with accompanying drawing.
The invention provides a kind of 45 ° of oblique axis pumping methods that are used for strip shaped laser crystal, be processed into and the vertical inclined-plane at 45 of laser crystal the end that is about to strip shaped laser crystal, make pump light be coupled into laser crystal by described 45 ° of inclined-planes, pump light is (Zig-Zag) propagation in a zigzag in laser crystal, the pumping laser crystal; In the pump light axial plane, the projection angle at 45 of described pumping optical axis and vibration/amplifying laser optical axis of injecting from the side.
A kind of input mode of vibration/amplifying laser is in said method: with two other lateral vertical cutting of described strip shaped laser crystal, make vibration/amplifying laser inject described vertical plane, by the inner total reflection on 45 ° of inclined-planes of described laser crystal, at the inner linear light path that forms of laser crystal.The another kind of input mode of vibration/amplifying laser is: two other side of described strip shaped laser crystal is cut into Brewster's angle, make vibration/amplifying laser inject described side with Brewster's angle, by the inner total reflection on 45 ° of inclined-planes of described laser crystal, in inner (Zig-Zag) light path in a zigzag that forms of laser crystal.
Implement the pump module of above-mentioned 45 ° of oblique axis pumping methods, following several scheme arranged:
First embodiment
As shown in Figure 1, pump module comprises pump light source 4, leaded light awl 5 and strip shaped laser crystal 3, the end of strip shaped laser crystal 3 is and the vertical inclined-plane at 45 of laser crystal, pump light source 4 is coupled into laser crystal 3 with pump light by described 45 ° of inclined-planes by leaded light awl 5, thus make pump light 6 in laser crystal in a zigzag (Zig-Zag) propagate.Two other side of strip shaped laser crystal 3 is the plane of perpendicular cuts, thereby makes the inner total reflection of laser 7 by 45 ° of inclined-planes of described laser crystal of incident, at the inner linear light path that forms of laser crystal.
Described laser crystal is made by dopant material, the solid laser material that the preferred absorption coefficient of dopant material is low, and as Yb:YAG, Tm:YAG, or the laser diode-pumped Nd:YAG of 885 μ m.
Second embodiment
As shown in Figure 2, pump module comprises pump light source 4, leaded light awl 5 and strip shaped laser crystal 3, the end of strip shaped laser crystal 3 is and the vertical inclined-plane at 45 of laser crystal, pump light source 4 is coupled into laser crystal 3 with pump light by described 45 ° of inclined-planes by leaded light awl 5, thus make pump light in laser crystal in a zigzag (Zig-Zag) propagate.Two other side of strip shaped laser crystal 3 is the side with Brewster's angle, thereby makes the inner total reflection of laser by 45 ° of inclined-planes of described laser crystal of incident, in inner (Zig-Zag) light path in a zigzag that forms of laser crystal.The zigzag (Zig-Zag) that adds pump light on the other direction is propagated, and can compensate the thermal lensing effect on the both direction on the laser cross section effectively like this.In addition, the Brewster's angle acting in conjunction of the incident of laser generation, exit facet can guarantee that pump light all can inner total reflection take place on other 4 laser crystal surfaces of removing the pumping coupling surface and can not leak in the 45 of pump light incoming cross-section and the laser crystal.Fig. 3 a and Fig. 3 b have shown the zigzag laser generation/amplification light path of laser crystal inside among Fig. 2.
The 3rd embodiment
As shown in Figure 4, pump module comprises pump light source 4, leaded light awl 5 and strip shaped laser crystal 3, the end of strip shaped laser crystal 3 is and the vertical inclined-plane at 45 of laser crystal, pump light source 4 is coupled into laser crystal 3 with pump light by described 45 ° of inclined-planes by leaded light awl 5, thus make pump light in laser crystal in a zigzag (Zig-Zag) propagate.Two other side of strip shaped laser crystal 3 is the plane of perpendicular cuts, thereby makes the inner total reflection of laser by 45 ° of inclined-planes of described laser crystal of incident, at the inner linear light path that forms of laser crystal.
In this embodiment, described laser crystal middle section adopts dopant material to make, both sides or the plain material of bonding all around.The solid laser material that the preferred absorption coefficient of dopant material is low, as Yb:YAG, Tm:YAG, or the laser diode-pumped Nd:YAG of 885 μ m.Plain material is non-doped YAG material.
Similarly, by doping laser crystal 3a and two other side of the recombination laser crystal that laser crystal 3b forms that undopes also can perpendicular cuts, vibrate at the inner linear laser that forms of solid batten laser crystal by extraneous resonator mirror and by the inner total reflection of cutting the cross section.At this description of drawings in addition not just.
Claims (4)
1. 45 ° of oblique axis pumping methods that are used for strip shaped laser crystal, it is characterized in that: the end of strip shaped laser crystal is processed into and the vertical inclined-plane at 45 of laser crystal, make pump light be coupled into laser crystal by described 45 ° of inclined-planes, pump light is propagated in laser crystal in a zigzag, the pumping laser crystal; In the pump light axial plane, the projection angle at 45 of pumping optical axis and vibration/amplifying laser optical axis of injecting from the side, two other lateral vertical cutting with strip shaped laser crystal, make vibration/amplifying laser inject the plane that forms after the perpendicular cuts, the inner total reflection on 45 ° of inclined-planes by laser crystal is at the inner linear light path that forms of laser crystal.
2. enforcement is used for the pump module of 45 ° of oblique axis pumping methods of strip shaped laser crystal according to claim 1, comprise pump light source, leaded light awl and strip shaped laser crystal, it is characterized in that: the end of described strip shaped laser crystal is and the vertical inclined-plane at 45 of laser crystal, pump light source (4) is coupled into laser crystal (3) with pump light by described 45 ° of inclined-planes by leaded light awl (5), makes pump light propagate in a zigzag in laser crystal; Two other side of described strip shaped laser crystal is the plane of perpendicular cuts, makes the laser of incident pass through the inner total reflection on 45 ° of inclined-planes of laser crystal, at the inner linear light path that forms of laser crystal.
3. according to the described pump module that is used for 45 ° of oblique axis pumping methods of strip shaped laser crystal of claim 2, it is characterized in that: described laser crystal is made by dopant material; Perhaps described laser crystal middle section adopts dopant material to make, both sides or the plain material of bonding all around.
4. according to the described pump module that is used for 45 ° of oblique axis pumping methods of strip shaped laser crystal of claim 3, it is characterized in that: described dopant material is Yb:YAG, Tm:YAG, or the laser diode-pumped Nd:YAG of 885 μ m.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100596010A CN100356639C (en) | 2005-03-29 | 2005-03-29 | 45 deg. oblique axis pumping method and pumping module for strip shaped laser crystal |
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| CNB2005100596010A CN100356639C (en) | 2005-03-29 | 2005-03-29 | 45 deg. oblique axis pumping method and pumping module for strip shaped laser crystal |
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| CN100356639C true CN100356639C (en) | 2007-12-19 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100399651C (en) * | 2006-07-26 | 2008-07-02 | 中国科学院上海光学精密机械研究所 | Lath laser for implementing Z shape light path by reflecting glass |
| CN108666857A (en) * | 2018-04-18 | 2018-10-16 | 苏州四海常晶光电材料有限公司 | Cr is processed using Brewster's angle4+:The method of YAG crystal |
| CN108879311B (en) * | 2018-06-29 | 2020-04-10 | 北京遥测技术研究所 | Pumping coupling device and method for slab-shaped laser crystal |
| CN109361137B (en) * | 2018-12-11 | 2024-01-26 | 中国工程物理研究院激光聚变研究中心 | Laser gain component and laser |
| CN113540939A (en) * | 2021-07-05 | 2021-10-22 | 苏州英谷激光有限公司 | Double-end pumping high-power laser |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6256142B1 (en) * | 1998-07-07 | 2001-07-03 | Trw Inc. | End pumped zig-zag slab laser gain medium |
| US6625194B1 (en) * | 1998-06-26 | 2003-09-23 | Sony Corporation | Laser beam generation apparatus |
| CN2598214Y (en) * | 2003-01-16 | 2004-01-07 | 华南理工大学 | Solid strip laser of laser diode inclination pumping |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6625194B1 (en) * | 1998-06-26 | 2003-09-23 | Sony Corporation | Laser beam generation apparatus |
| US6256142B1 (en) * | 1998-07-07 | 2001-07-03 | Trw Inc. | End pumped zig-zag slab laser gain medium |
| CN2598214Y (en) * | 2003-01-16 | 2004-01-07 | 华南理工大学 | Solid strip laser of laser diode inclination pumping |
Non-Patent Citations (1)
| Title |
|---|
| 边缘抽运复合Yb:YAG/YAG薄片激光器设计与功率扩展 柳强，巩马理，潘圆圆等.物理学报，第53卷第7期 2004 * |
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Granted publication date: 20071219 Termination date: 20170329 |