CN102208748A - A multi-pumped disk solid-state laser - Google Patents

Abstract

The invention provides a multi-pumped disk solid-state laser, which includes a stack of semiconductor lasers, a pump beam collimation system, a cooling finger, a laser disk crystal, a laser output mirror, a parabolic mirror and a 180-degree reflective The first and second folding mirrors, the laser disc crystal is placed at the focal point of the parabolic reflector, the first and second folding mirrors are located on the reflection light path of the parabolic reflector, and are respectively located on both sides of the laser disc crystal; the semiconductor The pump beam emitted by the laser stack is collimated by the pump light collimator and then enters the parabolic reflector, the first folding mirror, the second folding mirror and the laser disc crystal. After multiple pumps, the laser resonator Obtain laser output. The disk solid-state laser achieves multiple transmissions of controllable pump light, the pump spot area is reasonable, and the power density distribution is uniform. Only simple collimation of the incident pump beam is required to achieve high power and high efficiency. , High beam quality laser output.

Description

A multi-pumped disk solid-state laser

technical field

The invention belongs to laser technology, in particular to a disk solid laser.

Background technique

With the continuous improvement of laser technology, device level and manufacturing capacity, solid-state laser has become a unique branch of the laser family with its own unique advantages, and is developing rapidly in the direction of high average power, high beam quality and high conversion efficiency. At present, the development of high-end industrial solid-state lasers is very rapid, and the new generation of solid-state lasers represented by fiber lasers and disk solid-state lasers has become an important development direction. On the other hand, the interpenetration of solid-state laser technology and other high-tech has made solid-state lasers more and more widely used in the fields of automobile body outer panel welding, automobile panel tailor welding and metal sheet cutting.

The new type of disk solid-state laser mainly uses thin-plate laser crystal as the gain medium of the laser, and adopts the method of end-face or side-pumping. Since the thickness of the laser crystal is very thin (the value of Φ/d is very large, where Φ is the diameter of the crystal, and d is the thickness of the crystal), under the condition of liquid jet impingement cooling or high-efficiency TEC chip cooling technology, even if the pump with high power density When the light is pumped, the radial temperature gradient inside the crystal is very small, the temperature rise is not large, and the direction of heat flow in the crystal is parallel to the direction of the optical axis. This uniformly distributed temperature field greatly eliminates the thermal deformation of the crystal and the influence on the laser, so that the output laser has better beam quality.

Because the thickness of the gain medium of the disk solid-state laser is very small, generally between 0.1 and 1mm, and the effective absorption length is small, the multiple pumping technology and the uniformity design of the pump spot are the key to achieving high beam quality and high beam quality of the disk solid-state laser. One of the core technologies of conversion efficiency operation. In 2003, U.S. Patent Steffen Erhard et al. proposed a space-rotating multi-pump structure composed of a single parabola and a polygonal mirror (see U.S. Patent US6577666 B2); A large-scale prism realizes the scheme of beam space rotation and multiple pumping technology (see US patent US6891874B2).

In 2008, Professor Zhu Xiao and others proposed a scheme based on conjugated double paraboloids (see Chinese patent ZL200810048527.6), the multi-pass pumping structure of the tilted laser crystal and the correction mirror realizes the multiple transmission of the pump spot, and its pump The number of Pu is related to the angle between the laser crystal and the correction lens. In 2010, Professor Zhu Xiao et al. improved the above scheme (see PCT patent application PCT/CN2010/071865), proposed a new pump structure integrating multiple pumping and high-efficiency cooling, and developed a multi-disk string The connection module further improves the pumping efficiency and space utilization of the conjugated double paraboloid multi-pass pumping system.

Steffen Erhard et al. proposed that the multiple pumping technology of the disk laser requires the incident spot to be a circular collimated spot, and the spot rotates and transmits multiple times in the entire parabolic space, and the optical axis is symmetrically distributed to achieve multiple pumping. This requires the processing of larger paraboloids and folding mirrors to achieve the transmission of the above light; Professor Zhu Xiao et al. proposed a multiple pumping scheme of conjugate paraboloids, which directly determines the size of the pumping spot on the angle relationship between the correcting mirror and the disc. The number of times, the requirements for assembly and adjustment are relatively strict.

Contents of the invention

The object of the present invention is to provide a new type of multi-pumped disk solid-state laser, which can achieve high power, high efficiency, and high light beam only by relatively simple collimation of the incident pump beam. quality laser output.

The invention provides a multi-pumped disk solid-state laser, which includes a stack of semiconductor lasers, a pump beam collimation system, a cooling finger, a laser disk crystal, and a laser output mirror. The laser output mirror is composed of a laser disk crystal. Resonant cavity, cooling refers to cooling the laser disc crystal, it also includes a parabolic reflector, a first folding mirror and a second folding mirror, wherein the first folding mirror and the second folding mirror are 180-degree reflection, the laser disc The plate crystal is placed at the focal point of the parabolic mirror, and the first and second folding mirrors are located on the reflection light path of the parabolic mirror, and are respectively located on both sides of the laser disc crystal;

The pump beam emitted by the stack of semiconductor lasers is collimated by the pump light collimator and then enters the parabolic reflector, the first folding mirror, the second folding mirror and the laser disc crystal, where it is pumped many times, by the The laser resonator obtains laser output.

Further, the projections of the intersection line of the first folding mirror and the intersection line of the second folding mirror in the XOY coordinate system are parallel to the X axis, and the two projections are distributed in the first and third quadrants or the second and fourth quadrants of the XOY coordinate system. The distances projected to the X-axis are not equal, where the XOY coordinate system is a Cartesian coordinate system established with the center of the parabolic mirror as the origin, the horizontal direction as the X-axis, and the vertical direction as the Y-axis.

Further, the intersection line of the first folding mirror is not parallel to the intersection line of the second folding mirror, both intersection lines are parallel to the plane determined by the XOY coordinate system, and the line connecting the midpoint of the projection of the two intersection lines in the plane Pass the origin of the XOY coordinate system, and the distance to the origin is equal; wherein the XOY coordinate system is a Cartesian coordinate system established with the center of the parabolic reflector as the origin, the horizontal direction as the X axis, and the vertical direction as the Y axis; the first fold There is an inlet for pumping light on the mirror or the second folding mirror, and the pumping beam emitted by the stack of semiconductor lasers is collimated by the pumping light collimator and then enters the parabolic reflector through the inlet.

The present invention has the following beneficial effects:

(1) The disk solid-state laser described in the present invention adopts the semiconductor laser cascade pumping method, which has high efficiency, long service life and convenient equipment maintenance.

(2) The disk solid-state laser of the present invention adopts a multiple pumping concentrating cavity composed of a parabolic reflector, a disk-shaped laser crystal, and two 180-degree reflecting folding mirrors, and realizes controllable pumping light. With multiple transmissions, the pump spot area is reasonable and the power density distribution is uniform.

(3) The disk solid-state laser of the present invention realizes multiple pumping while reducing the collimation requirements for the pumping light of the semiconductor laser, simplifying the pumping structure, reducing the cost, and improving the practicability of the system.

(4) The present invention can flexibly adopt different implementation schemes according to specific usage requirements, construct V-shaped or other forms of laser resonators to obtain large mode volume or fundamental mode output, and connect multiple disc-shaped laser crystals with gain in series for higher output power.

(5) The disk solid-state laser described in the present invention has small volume, simple mechanical structure and adjustment, light weight, and is convenient for industrial application.

Description of drawings

The structural diagram of the disk solid-state laser with folded mirrors placed in parallel in Fig. 1;

Figure 2180-degree reflection folding mirror diagram;

The distribution characteristics of the light spots on the parabolic mirror in the disk solid-state laser with folded mirrors placed in parallel in Fig. 3;

Fig. 4 Structural diagram of disk solid-state laser with folded mirror rotated;

Figure 5. The distribution characteristics of the light spots on the parabolic mirror in the disk solid-state laser with the folding mirror rotated;

Fig. 6 The structural diagram of a disk solid-state laser with folded mirrors and double paraboloids rotated.

Detailed ways

The invention adopts one or more stacked semiconductor lasers as the pumping source, and a parabolic reflector, a disc-shaped laser crystal and two 180-degree reflecting folded mirrors form a multi-pump homogenizing light-gathering cavity. Using the 180-degree reflective folding mirror and the optical characteristics of parabolic reflective focusing, controllable multiple pumping is realized.

In the first specific implementation mode (referred to as Scheme 1 for short), the two 180-degree reflecting folding mirrors are located on the reflection optical path of the parabolic reflecting mirror, and the intersection lines of the two 180-degree reflecting folding mirrors are parallel to each other and distributed on the parabolic surface In the first and third quadrants or the second and fourth quadrants of the XOY coordinate system determined by the mirror, the projection of the two intersection lines in the XOY coordinate system is parallel to the X axis and there is a certain difference in the distance to the X axis (|L1-L2| ≠0). The pumping light enters the parabolic reflector from above the first folding mirror, is reflected by the parabolic reflector, and is directly pumped into the disc laser crystal. Two folding mirrors, the folding mirror translates the incident light with the intersection line of the folding mirror as the symmetrical axis, and then reflects it to the parabolic reflector at 180 degrees, and then enters the laser disc crystal again after being reflected by the parabolic reflector. The unabsorbed light is reflected by the parabolic mirror and then incident on the first folding mirror in parallel, because there is a certain difference in the distance from the intersection line of the two folding mirrors to the coordinate system X (|L1-L2|≠0). Therefore, the light enters the first folding mirror to complete the translation and 180-degree reflection again, and returns to the paraboloid. Since then, the above pumping process has been repeated continuously, and finally the multiple pumping of the homogenized spot is completed. The pump light forms a series of parallel pump spots on the parabolic mirror, and forms a uniform pump spot on the disc, effectively improving Light-to-light conversion efficiency of lasers.

In the second specific implementation mode (referred to as scheme 2 for short), the two 180-degree reflecting folding mirrors are located on the reflection optical path of the parabolic reflector, and the intersection line of the two 180-degree reflecting folding mirrors has a certain angle α, The intersection line of the two 180-degree reflective folding mirrors in the XOY plane determined by the paraboloid is connected to the midpoint of the projection, and the distance to the origin is equal to the origin. The pumping light enters the parabolic reflector from the incident aperture on the first folding mirror, and the light is directly pumped into the disc laser crystal after being reflected by the parabolic reflector, and the unabsorbed light returns to the parabolic reflector again in parallel The light leaves the parabolic reflector and enters the second folding mirror. Since the second folding mirror has a certain rotation relative to the first folding mirror, the second folding mirror translates the light with the intersection line of the folding mirror as the axis of symmetry of the pumping light. Rotated relative to the parabolic coordinate system, the reflected light returns to the parabolic reflector, and is incident into the laser disc crystal again. After that, the unabsorbed light is reflected by the parabolic reflector, and then parallel incident to the first folding mirror. Since there is a certain angle between the intersection line of the two folding mirrors, the light incident on the first folding mirror avoids the incident aperture on the folding mirror. After that, the light is mirrored by the parabolic reflector and reflected back to the parabolic reflector by 180 degrees. The light repeats the above process in this way, and finally completes multiple pumping. The pump light forms a circular distribution of light spots in the projected area of the XY coordinate system by the two folding mirrors on the parabolic reflector, and the light spots themselves rotate, so as to realize the homogenization and multiple transmission of the pump light spots on the disc, effectively improving Light-to-light conversion efficiency of lasers.

Below in conjunction with accompanying drawing and example the present invention is described in further detail.

As shown in Figure 1, the disk solid-state laser provided by Scheme 1 includes a parabolic mirror 1, a first folding mirror 2, a second folding mirror 3, a cooling finger 4, a laser disk crystal 5, a collimated laser beam 6, Semiconductor laser stack 12 , pump beam collimation system 13 and laser output mirror 14 . The pumping beam emitted by the semiconductor laser array 12 is collimated by the pumping light collimator 13 and then enters the multiple pumping system composed of the parabolic mirror 1, the first folding mirror 2, the second folding mirror 3 and the laser disc crystal 5. In the pumping system, multiple, efficient and uniform pumping is realized, and the laser disc crystal 5 and the laser output mirror 14 form a resonant cavity to obtain laser output.

The parabolic reflector 1 has the characteristics of reflective focusing, which converges the incident parallel light beams to its focal point, and the paraboloid is coated with a film layer that is highly reflective to the pump light.

Both the first folding mirror 2 and the second folding mirror 3 are folding mirrors with 180-degree reflection. The folding mirror is composed of two parts. The combination of these two parts completes the 180-degree retroreflection of the light. The intersection line of the two parts on the bottom surface is called the Intersection line of folded mirrors. The folding mirror can be two rectangular prisms, two Paul prisms, or two plane mirrors placed at an angle of 90 degrees. If it is a prism, the hypotenuse of the prism is coated with an anti-reflection coating for the pump light, and the two right-angle surfaces are polished to use the total internal reflection of the light to achieve 180-degree retroreflection of the beam. If two plane mirrors placed at an angle of 90 degrees are used, the plane of the reflected light must be coated with a high reflection film for the pump light. Figure 2 shows a schematic diagram of a folding mirror composed of two plane mirrors placed at an angle of 90 degrees, where the straight line AB is the intersection line of the folding mirror, which is an important assembly reference line in the assembly of multiple pumping systems.

The cooling finger 4 is the cooling part and supporting part of the laser disc crystal 5. The disc laser crystal 5 is welded, pasted or clamped on the cooling finger 4 to efficiently cool the laser disc crystal 5, and jet impact cooling can be used. The liquid cooling method can also adopt the cooling method of patch or microchannel.

The laser disc crystal 5 has a thickness of 0.1 mm to 1 mm and a diameter of 4 mm to 25 mm, and is used as an active medium of the laser. The crystal is placed at the focal point of the parabolic reflector 1, and the side away from the parabolic reflector is coated with a film layer that is highly reflective to the pump light and the output laser. Highly transparent film layer for pump light and output laser to reduce reflection loss of pump light and output laser. The laser disc crystal 5 can be properly defocused when installed.

The laser beams 6, 7, 8, 9, 10, 11 are transmitted in the order of 6, 7, 8, 9, 10, 11 after passing through the semiconductor laser collimation system and entering the multiple pumping systems. The semiconductor laser stack 12 is used as the pumping source of the disk solid-state laser. The divergence angle and spot size of the beam on the fast axis (X direction) and slow axis (Y direction) are different, so it needs to be collimated before it can be used.

The pumping beam collimator 13 collimates the beams emitted by the semiconductor laser stack 12, and the collimated pumping beams have smaller and equal divergence angles in X and Y directions. Make the spot size after entering the paraboloid focus meet the design requirements, so as to obtain a strip-shaped spot.

The laser output mirror 14 is an output coupling mirror, which may be a flat mirror or a curved mirror. It forms a resonant cavity with the laser all-reflection film on one end surface of the laser disc crystal 5, realizes resonant amplification, and completes laser output.

The working process of the first disc solid-state laser described in the present invention is as follows: the collimated pumping light 6 is incident on the parabolic reflector 1 from above the first folding mirror 2, and is reflected by the parabolic reflector 1 to its focal point , the laser disc crystal is placed at the focal point of the parabolic mirror to defocus properly, so the pump light incident on the laser disc crystal is partially absorbed, and the unabsorbed pump light is reflected back to the parabolic mirror 1 by the crystal, After being reflected by the parabolic reflector, the light beam 7 leaves the parabolic reflector and enters the second folding mirror 3. Since the second folding mirror 3 has the characteristic of 180-degree retro-reflection, the light beam 7 takes the intersection line AB of the second folding mirror as the axis of symmetry. 7 After reflection and translation, the light beam 8 returns to the parabolic reflector 1, and is focused again into the laser disc crystal. The unabsorbed pump light is reflected back to the parabolic reflector by the laser crystal again. Due to the translation characteristics of the second folding mirror, Make the light beam reflected this time in the fourth quadrant of the parabolic reflector, leave the parabolic reflector 1 and enter the first folding mirror 2 with the light beam 9, and complete the translation of the light beam and the return reflection of 180 degrees in the first folding mirror 2, with The light beam 10 is incident on the parabolic reflector 1 again, and then enters the laser disc crystal again. The unabsorbed light beam is reflected back to the second quadrant of the parabolic reflector 1. After the light beam is reflected by the parabolic reflector, it enters the second fold with the light beam 11 Mirror 3. Therefore, the light beam forms a cycle in the multiple pumping system to realize multiple pumping of the laser disc crystal.

The scheme layout and light transmission characteristics are described as follows: take the center of the parabolic reflector 1 as the origin, take the horizontal direction as the X axis, and the vertical direction as the Y axis to establish a rectangular coordinate system XOY. Two 180-degree reflective folding mirrors 2 and 3 are located on the reflection optical path of the parabolic mirror 1, and the projection of the intersection line AB of the first folding mirror 2 and the intersection line CD of the second folding mirror 3 in the XOY coordinate system is parallel to the X axis , and distributed in the first and third quadrants or the second and fourth quadrants of the XOY coordinate system, the projection of the two folding mirrors in the XOY plane is shown in Figure 3, where A'B' and C'D' are respectively the first folding mirror 2 The projection of the intersection line of and the intersection line of the second folding mirror 3 on the coordinate plane. A'B' and C'D' are both parallel to the X-axis and the lengths from the X-axis are L1 and L2 respectively, and the difference between the two is |L1-L2|≠0. Only in this way can it be ensured that the pump beam incident from the first folding mirror passes through the parabolic reflector, the laser crystal and the light beam reflected by the second folding mirror enters the first folding mirror for parallel reflection and then returns to the multiple reflection system to achieve multiple reflections. Second panning reflection. Where a is the incident beam spot after collimation, which is reflected by the parabolic mirror and the disc crystal and then incident on the parabolic mirror to form the spot b, after which the folding mirror reflects the beam back to the parabolic mirror with A'B' symmetry, and on the parabolic Spot c is formed on the laser crystal, and the beam is reflected by the laser crystal again and returns to the paraboloid to form spot d. After that, the light beam enters the first folding mirror, is symmetrically reflected by the intersection line C'D', and then re-incident on the parabolic surface to form a spot e, and then incident on the parabolic reflector and then focused to the disc crystal, while the unabsorbed light beam returns to the parabolic surface for reflection The mirror forms a spot f, and the above process is repeated to form multiple pumps. Therefore, in Fig. 3, a, e, d are the spot distribution characteristics of the light spot entering and exiting the first folding mirror 2 on the parabolic reflector 1, b, c, f are the light spots entering and exiting the second folding mirror 3 on the parabolic reflector 1 It can be seen that since the intersection lines of the two folding mirrors are parallel to each other, the light spots formed on the parabolic reflector are also distributed in parallel, and the number of pumping spots is affected by the parameter N=L/|L1-L2|, where L As shown in Figure 2, is the distance between the two hypotenuses of the folding mirror. When N=2n (n is a positive integer), the light beam in each folding mirror is transmitted 2n+1 times, and 2n+1 parallel spot divisions are formed in the corresponding paraboloid area, and the pumping times of the disc crystal is 2× (2n+1) times. When N=2n+1, there are 2n+2 spot disc crystals in the folding mirror, and the pumping times are 2×(2n+2) times. When 2n<N<2n+1, the pumping times of the disc crystal are also between 2×(2n+1) times and 2×(2n+2) times.

As shown in Figure 4, the disk solid-state laser provided by Scheme 2 includes a parabolic mirror 1, a first folding mirror 2, a second folding mirror 3, a cooling finger 4, a laser disk crystal 5, a collimated laser beam 6, Pump light entrance 15, laser output mirror 14, semiconductor laser array 12, pump beam collimation system 13. The pump beam emitted by the semiconductor laser stack 12 is collimated by the pump light collimator 13 and then enters the parabolic reflector 1, the first folding mirror 2, the second folding mirror 3, and the multiple pumping beam formed by the laser disc crystal 5. In the pump system, multiple, efficient and uniform pumping is realized; the laser crystal 5 and the laser output mirror 14 form a resonant cavity to obtain laser output.

The film layers and functions of the above-mentioned devices are basically the same as those in Scheme 1, but there are large differences in spatial layout and positional relationship, which make the distribution of pump beams different during spatial transmission. In order to realize the transmission scheme, a rectangular coordinate system XOY is established with the center of the parabolic reflector 1 as the origin, the horizontal direction as the X axis, and the vertical direction as the Y axis. Two 180-degree reflecting folding mirrors 2 and 3 are located on the reflection optical path of the parabolic mirror 1, and the intersection line between the first folding mirror 2 and the second folding mirror 3 is parallel to the XOY plane. And there is a certain angle α (α>0) between the intersection lines of the two folding mirrors, and the line connecting the projection midpoints of the two intersection lines in the XOY plane determined by the parabolic reflector 1 passes through the origin and has the same distance to the origin. The first folding mirror 2 or the second folding mirror 3 has an entrance 15 for pumping light, through which the pumping light enters the multiple pumping system after being collimated. The working process of the second disk solid-state laser described in the present invention is as follows:

The collimated pump light 6 enters the parabolic reflector 1 from the pump light entrance 15 on the first folding mirror 2, and is reflected by the mirror to its focal point. The laser disc crystal is placed at the focal point of the parabolic reflector. Therefore, part of the incident laser disc crystal is absorbed, and the unabsorbed pump light is reflected back to the parabolic mirror 1 by the crystal, and is reflected by the parabolic mirror so that the pump light leaves the parabolic mirror and enters the second folding mirror 3. The intersection line AB of the two folding mirrors 3 has a rotation angle α with respect to the intersection line CD of the first folding mirror 2 and has the characteristic of 180-degree retro-reflection, so the incident pump beam takes the intersection line AB of the second folding mirror as the axis of symmetry The light is reflected and translated to the parabolic reflector 1, and focused again into the laser disc crystal, the unabsorbed pump light is reflected back to the parabolic reflector by the laser crystal again, and returns to the first parabolic reflector due to the existence of the rotation angle α The light from the folding mirror 2 is transferred to other positions of the folding mirror (leaving the pumping light entrance 15) and is translated and reflected back to the paraboloid by the first folding mirror 2, and pumps the laser disc crystal 5 again. After that, the above process is repeated continuously to realize the pumping Multiple reflections of Pu light.

The scheme layout and light transmission characteristics are described as follows: with the origin of the parabolic reflector as the center, the horizontal direction as the X axis, and the vertical direction as the Y axis, a rectangular coordinate system XOY is established. The intersection line of the two folding mirrors is placed parallel to the XOY plane, and the projection in the XOY plane is shown in Figure 5, where A'B' and C'D' are the intersection line of the first folding mirror 2 and the intersection line of the second folding mirror 3 In the projection of the coordinate plane, the line connecting the midpoints O2 and O3 of the intersecting lines passes through the origin, and the distance to the origin is the same. The center of the laser disc crystal is the origin O of the coordinate system. According to the principle of optical imaging, the intersection line A'B' of the second folding mirror passes through the parabola 1 and the laser disc crystal 5 on the plane of the intersection line C'D' of the first folding mirror Imaged as A"B". There is an angle α between A"B" and the first folding mirror C'D', which determines the number of times of multiple pumping spots and the distribution characteristics of the pumping spots in space. The pump spot is incident from the pump light entrance a, reflected by the parabolic mirror 1 and the laser disc crystal 5, and then incident on the second folding mirror at b, due to the 180-degree retro-reflection characteristic of the second folding mirror, the beam b follows the intersection line A'B' symmetrical imaging is reflected back to the parabolic reflector by the beam c, and then returned to the symmetrical area of the parabolic reflector after being reflected by the laser disc crystal to form the beam d, reflected back to the first folding mirror, and in the first folding mirror as The mirror image of the intersection line C'D' is reflected by the light beam e back to the parabolic reflector. The above process is repeated continuously, and finally a series of spots are formed in the paraboloid area corresponding to the first folding mirror. Rotate relative to midpoint O2 during multiple transfers. Similarly, in the parabolic area corresponding to the second folding mirror, a series of light spots are symmetrically distributed with the midpoint O3 of the intersection line as the center of the circle, and the light spots rotate relative to the midpoint O3 during multiple transmissions, so that the pumping to the laser disk The pumping area is more uniform after the superposition of the light spots inside the lamella crystal. The number and distribution characteristics of the pump spot are determined by the angle α between the intersection line of the two folded mirrors and the position of the incident beam. The number of times of light transmission in the folded mirror n=mπ/α (if α cannot be divisible by π, first convert it into a fraction , the value of m is the least common multiple of the numerator in the fraction, and it is an integer, so that it satisfies the divisibility relationship). Then, the pumping light beam is transmitted 2n times between the folding mirrors, and it is pumped 4n times compared to the disc laser crystal. The position distribution of the pump spot on the paraboloid is preferably incident at the position of the angle bisector of the intersection angle, so that all the spots are evenly distributed with the center of the circle as the origin.

As shown in Figure 6, on the basis of Scheme 2, it can be found that the distribution of the pump light on the parabolic mirror falls on the projection area of the folding mirror on the parabolic mirror and is distributed circularly. Therefore, in order to save the processing materials and Processing cost, only need to process two partial parabolic mirrors with the same surface function spatially symmetrical distribution to provide effective reflection focusing, and they can be assembled to the corresponding positions during assembly. Its transmission mode and working principle are the same as those of Scheme 2 same.

The present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can adopt various other specific embodiments to implement the present invention according to the disclosed content of the present invention. Changes or modified designs all fall within the protection scope of the present invention.

Claims (3)

1. disc piece solid laser of pumping repeatedly, comprise the folded battle array of semiconductor laser (12), pump beam colimated light system (13), cooling refers to (4), laser disc crystal (5) and laser output mirror (14), laser output mirror (14) constitutes resonant cavity with laser disc crystal (5), cooling refers to that (4) are used for laser disc crystal (5) is cooled off, it is characterized in that, it also comprises parabolic reflector (1), first refrative mirror (2) and second refrative mirror (3), wherein first refrative mirror (2) and second refrative mirror (3) are 180 degree reflections, laser disc crystal (5) is placed on the focus place of parabolic reflector (1), first, second refrative mirror (2,3) all be positioned on the reflected light path of parabolic reflector (1), and lay respectively at the both sides of laser disc crystal (5);

The pump beam of the folded battle array of semiconductor laser (12) emission enters parabolic reflector (1), first refrative mirror (2), second refrative mirror (3) and laser disc crystal (5) after collimating through pump light collimater (13), through repeatedly pumping, obtain laser output therein by described laserresonator.

2. disc piece solid laser according to claim 1, it is characterized in that, the equal paralleled by X axis of the projection of intersection in the XOY coordinate system of the intersection of first refrative mirror (2) and second refrative mirror (3), and two projections are distributed in one, three quadrants or two, the four-quadrant of XOY coordinate system, two to project to the distance of X-axis unequal, wherein the XOY coordinate system is that the center of circle with parabolic reflector (1) is an initial point, is X-axis with the horizontal direction, and vertical direction is the rectangular coordinate system that Y-axis is set up.

3. disc piece solid laser according to claim 1, it is characterized in that, the intersection of the intersection of first refrative mirror (2) and second refrative mirror (3) is not parallel, two intersections all are parallel to by the determined plane of XOY coordinate system, the line of the projection mid point of two intersections in this plane is crossed the initial point of XOY coordinate system, and equates to the distance of initial point; Wherein the XOY coordinate system is that the center of circle with parabolic reflector (1) is an initial point, is X-axis with the horizontal direction, and vertical direction is the rectangular coordinate system that Y-axis is set up;

Have the inlet (15) of a pump light on first refrative mirror (2) or second refrative mirror (3), the pump beam of the folded battle array of semiconductor laser (12) emission enters parabolic reflector (1) through pump light collimater (13) collimation back by this inlet.

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