阅读说明：本技术 一种端面泵浦固体激光器 (End-pumped solid laser ) 是由 马英俊 李悦萌 于 2021-09-10 设计创作，主要内容包括：本发明提供了一种端面泵浦固体激光器,包括N级双程放大光路和/或N级单程放大光路,N为大于或等于1的自然数；每一级放大光路中包括一个泵浦元件,每相邻两个放大光路中,两个所述泵浦元件分别位于激光器光路的左右两侧。激光在每一级放大光路中被放大,最终满足所需使用的激光功率后,从固体激光器输出。本发明提供的固体激光器可以使用较少数量的激光高反射镜,使得每一级放大光路中,泵浦源发出的光与信号光同轴,对信号光进行多级放大；因为减少了激光高反射镜的使用,从而缩短了光程,大大降低了激光器的调试难度,降低了激光器在所有反射镜处的损耗,提高了激光放大功率和光束质量,激光器系统稳定性也大大增强。(The invention provides an end-pumped solid-state laser, which comprises an N-stage double-pass amplification light path and/or an N-stage single-pass amplification light path, wherein N is a natural number greater than or equal to 1; each stage of amplification light path comprises a pumping element, and in every two adjacent amplification light paths, the two pumping elements are respectively positioned at the left side and the right side of the laser light path. The laser is amplified in each stage of amplification light path, and is output from the solid laser after the laser power required by the laser is finally met. The solid laser provided by the invention can use a small number of laser high reflectors, so that light emitted by a pumping source is coaxial with signal light in each level of amplification light path, and the signal light is amplified in multiple levels; the use of high laser reflectors is reduced, so that the optical path is shortened, the debugging difficulty of the laser is greatly reduced, the loss of the laser at all reflectors is reduced, the laser amplification power and the beam quality are improved, and the system stability of the laser is greatly enhanced.)

1. An end-pumped solid-state laser comprises a seed source, a plurality of pumping elements, a plurality of laser crystals, an isolation element and a plurality of optical path adjusting elements; the end-pumped solid-state laser is characterized by comprising an N-stage double-pass amplification light path and/or an N-stage single-pass amplification light path, wherein N is a natural number greater than or equal to 1; each stage of amplification light path comprises a pumping element, and in every two adjacent amplification light paths, the two pumping elements are respectively positioned at the left side and the right side of the laser light path; in the double-pass amplification optical path, after signal light output by the seed source passes through the isolation element and the first optical path adjusting element, the signal light and pump light of the first pump element coaxially enter a first laser crystal to complete one-pass amplification; the signal light amplified by the first laser crystal is returned by the first light path adjusting element, passes through the first laser crystal for the second time to become double-pass amplified laser, and the transmission direction is changed when the original path of the double-pass amplified laser is returned to the isolating element, and the laser enters the next stage of amplification light path or is output; in the single-pass amplification light path, signal light passes through the second light path adjusting element and then is coaxially transmitted to the second laser crystal together with pump light emitted by the second pump element, single-stage amplification is completed, and the signal light enters a next-stage amplification light path or is output.

2. An end-pumped solid state laser as claimed in claim 1 wherein said optical path conditioning element is a highly reflective optical element.

3. An end-pumped solid state laser as claimed in claim 2 wherein the laser light from said pumping element is transmitted coaxially with the signal light in each stage of the two-way amplification path or each stage of the one-way amplification path.

4. An end-pumped solid state laser as claimed in claim 3 wherein said first optical path adjusting element comprises 4 highly reflective optical elements.

5. An end-pumped solid state laser as claimed in claim 4 wherein the 4 highly reflective optical elements, 2 of which are 45 ° laser highly reflective mirrors, 1 of which is 0 ° laser highly reflective mirrors, and 1 of which is 45 ° laser highly counter-pumped optical high lens; after passing through the isolation element, the signal light emitted by the seed source passes through the two 45-degree laser high-reflection mirrors to the first laser crystal, and the pump light emitted by the first pump element is transmitted to the first laser crystal through the 45-degree laser high-reflection pump light high lens to complete first-stage one-way amplification; the signal light amplified by the first laser crystal is transmitted to the 0-degree laser high reflecting mirror through the 45-degree laser high-back pump light high lens and returned to the isolation element by the original path, and the signal light passes through the first laser crystal for the second time in the original path returning light path to complete double-pass amplification.

6. An end-pumped solid state laser as claimed in claim 3 wherein said second optical conditioning element comprises at most three highly reflective optical elements, said three highly reflective optical elements being 2 high mirrors for 45 ° laser and 1 high lens for 45 ° laser high counter-pumping light; the signal light is transmitted coaxially with the pump light emitted by the second pump element after passing through the 45-degree laser high-reflection mirror and the 45-degree laser high-reflection pump light high-lens, the pump light emitted by the second pump element is incident to the second laser crystal together with the signal light after passing through the 45-degree laser high-reflection pump light high-lens, and the signal light is amplified in a single pass.

7. An end-pumped solid state laser as claimed in claim 1 comprising a shaping element for beam shaping the signal light such that the beam waist location of the signal light is within the laser crystal.

8. An end-pumped solid state laser as claimed in claim 1, wherein the end-pumped solid state laser comprises a shaping element for shaping the pump light emitted by the pumping element such that the pump light is focused within the laser crystal.

9. An end-pumped solid state laser as claimed in claim 7 or 8, wherein the shaping element comprises a collimating lens and/or a focusing lens.

10. An end-pumped solid state laser as claimed in claim 1 wherein the spacer elements comprise two half-wave plates and two spacers.

Technical Field

The invention belongs to the technical field of laser, and relates to an end-pumped solid laser.

Background

In the optical path structure of the end-pumped solid-state laser for realizing laser amplification, in order to realize matching of signal light and pump light and amplification of the laser, a large number of optical path adjusting elements are often adopted to make the optical path turn for many times, thereby amplifying the laser. An end-pumped solid-state laser as shown in fig. 1 of the specification comprises a two-way amplification optical path and two one-way amplification optical paths, wherein in each amplification optical path, a pumping element is arranged on the same side of an optical path system. In a first-stage double-pass amplification light path, signal light emitted by a seed source 1 is transmitted to a first laser crystal 61 through an isolation element and two 45-degree laser high reflectors 51 and 52, pump light is transmitted to the first laser crystal 61 through a 45-degree laser anti-pump light high lens 71, and first-stage single-pass amplification is completed on the signal light; the amplified signal light is transmitted to a 45-degree laser high-reverse pump light high lens 71, reflected to a 0-degree laser reflector 8, returned by the 0-degree laser reflector 8 in the original path, and passes through a laser crystal 61 for the second time to complete the first-stage double-pass amplification; the amplified signal light continues to return to the isolation element in the original path through the two 45-degree laser high-reflection mirrors 51 and 52, the transmission direction of the amplified signal light is changed by the isolation element, and the amplified signal light is transmitted downwards to enter a second single-pass amplification light path. In the second single-pass amplification optical path, the signal light sequentially passes through the four 45-degree laser high reflection mirrors 53, 54, 55 and 56, then passes through the 45-degree laser high reflection pump light high lens 72, and is coaxial with the pump light transmitted through the 45-degree laser high reflection pump light high lens 72, the pump light and the signal light are transmitted to the second laser crystal 62 together, and the signal light completes the second-stage single-pass amplification and enters the next-stage amplification optical path. After passing through the three 45-degree laser high-reflection mirrors 57, 58, and 59 and the 45-degree laser high-back pump light high lens 73, the signal light after the second-stage amplification coaxially transmits with the pump head passing through the 45-degree laser high-back pump light high lens 73 in the third-stage amplification light path, enters the third laser crystal 63 together, and is amplified for the third time and output.

In the end-pumped multi-stage amplification optical path shown in fig. 1, the pumping elements of each stage of amplification optical path are located on the same side of the laser, and in the first stage of two-pass amplification optical path, three 45 ° laser high reflectors and one 45 ° laser high-reflection pump optical high lens are used in common, so that the signal light and the pump light are transmitted coaxially, and the signal light is amplified; in the second-stage single-pass amplification light path, four 45-degree laser high reflectors and a 45-degree laser high-reflection pump light high lens are used together, so that signal light and pump light are transmitted coaxially, and the signal light is amplified; in the third-stage single-pass amplification light path, three 45-degree laser high reflectors and a 45-degree laser high-reflection pump light high lens are used together, so that signal light and pump light are transmitted coaxially, and the signal light is amplified. Therefore, in the end-pumped multistage amplification light path shown in fig. 1, each stage of amplification light path needs more reflection elements to turn the light path, the excessive reflection elements increase the debugging complexity of the laser, affect the laser beam quality, increase the loss of the laser at the light path adjusting element, and also greatly affect the laser if the stability of the light path adjusting element is insufficient.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides an end-pumped solid-state laser. The specific technical scheme is as follows.

An end-pumped solid-state laser comprises a seed source, a plurality of pumping elements, a plurality of laser crystals, an isolation element and a plurality of optical path adjusting elements; the end-pumped solid-state laser comprises an N-stage double-pass amplification light path and/or an N-stage single-pass amplification light path, wherein N is a natural number greater than or equal to 1; each stage of amplification light path comprises a pumping element, and in every two adjacent amplification light paths, the two pumping elements are respectively positioned at the left side and the right side of the laser light path; in the double-pass amplification optical path, after signal light output by the seed source passes through the isolation element and the first optical path adjusting element, the signal light and pump light of the first pump element coaxially enter a first laser crystal to complete one-pass amplification; the signal light amplified by the first laser crystal is returned by the first light path adjusting element, passes through the first laser crystal for the second time to become double-pass amplified laser, and the transmission direction is changed when the original path of the double-pass amplified laser is returned to the isolating element, and the laser enters the next stage of amplification light path or is output; in the single-pass amplification light path, signal light passes through the second light path adjusting element and then is coaxially transmitted to the second laser crystal together with pump light emitted by the second pump element, single-stage amplification is completed, and the signal light enters a next-stage amplification light path or is output.

Preferably, the optical path adjusting element is a highly reflective optical element.

Preferably, in each stage of the two-way amplification optical path or each stage of the one-way amplification optical path, the laser light emitted by the pumping element is transmitted coaxially with the signal light in the stage of the amplification optical path.

Preferably, the first optical path adjusting element includes 4 highly reflective optical elements.

Preferably, 2 of the 4 high-reflection optical elements are 45 ° laser high-reflection mirrors, 1 of the 4 high-reflection optical elements is 0 ° laser high-reflection mirror, and 1 of the 4 high-reflection optical elements is 45 ° laser high-reflection pumping optical high lens; after passing through the isolation element, the signal light emitted by the seed source passes through the two 45-degree laser high-reflection mirrors to the first laser crystal, and the pump light emitted by the first pump element is transmitted to the first laser crystal through the 45-degree laser high-reflection pump light high lens to complete first-stage one-way amplification; the signal light amplified by the first laser crystal is transmitted to the 0-degree laser high reflecting mirror through the 45-degree laser high-back pump light high lens and returned to the isolation element by the original path, and the signal light passes through the first laser crystal for the second time in the original path returning light path to complete double-pass amplification.

Preferably, the second optical adjustment element comprises at most three highly reflective optical elements, which are 2 45 ° laser high-reflection mirrors and 1 45 ° laser high-reflection pumping light high-lens; the signal light is transmitted coaxially with the pump light emitted by the second pump element after passing through the 45-degree laser high-reflection mirror and the 45-degree laser high-reflection pump light high-lens, the pump light emitted by the second pump element is incident to the second laser crystal together with the signal light after passing through the 45-degree laser high-reflection pump light high-lens, and the signal light is amplified in a single pass.

Preferably, the end-pumped solid-state laser includes a shaping element for beam-shaping the signal light such that a beam waist position of the signal light is located within the laser crystal.

Preferably, the shaping is performed such that the pump light emitted by the pump element is focused within the laser crystal.

Preferably, the shaping element comprises a collimating lens and/or a focusing lens.

Preferably, the isolation element comprises two half-wave plates and two isolators.

The end-pumped solid-state laser comprises a plurality of stages of laser amplification light paths, and is different from the prior art that the pumping elements in each stage of amplification light path are positioned on the same side of the laser; meanwhile, the use of high laser reflectors and beam shaping elements is reduced, the optical path is shortened, the debugging difficulty of the laser is greatly reduced, the loss of the laser at all reflectors is reduced, the laser amplification power and the beam quality are improved, and the system stability of the laser is also greatly enhanced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is an optical path diagram of an end-pumped solid-state laser in the prior art.

Fig. 2 is an optical path diagram of an end-pumped solid-state laser according to the present invention.

1. The laser comprises a seed source, 21 to 23 first to third pumping elements, 31 a half wave plate, 32 a half wave plate, 41 an isolator, 42 an isolator, 51 to 59 first to ninth 45-degree laser high-reflection mirrors, 61 to 63 first to third laser crystals, 71 to 73 first to third 45-degree laser high-reverse pumping light high lenses and 8.0-degree laser reflection mirrors.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 in the specification illustrates an end-pumped laser provided by the present invention, which includes a three-stage laser amplification path including a two-way amplification and two one-way amplifications. Wherein, three pumping elements 21-23 are respectively arranged at the left and right sides of the laser light path at intervals.

After passing through an isolation element composed of a half-wave plate 31, an isolator 41, an isolator 42 and a half-wave plate 32, signal light emitted by the seed source 1 is reflected to a first laser crystal 61 by two 45-degree laser high reflection mirrors 51 and 52, pump light emitted by a first pump element 21 passes through a first 45-degree laser high reflection pump light high lens 71, is coaxially transmitted with the signal light, and enters the first laser crystal 61 together, and the signal light completes first-stage single-pass amplification; the amplified signal light is reflected to the 0 ° laser reflector 8 through the first 45 ° laser high-back pump light high lens 71, and returns from the original path, and the signal light passes through the first laser crystal 61 for the second time, completing the first-stage two-pass amplification.

The signal light after completing the two-way amplification continues to return to the isolation element in the original path, changes the transmission direction when passing through the isolator 42, is transmitted downwards, is reflected by the two 45-degree laser high-reflection mirrors 53 and 54, is reflected by the second 45-degree laser high-reflection pump light high lens 72, is transmitted coaxially with the pump light emitted by the second pump element 22 and transmitted by the second 45-degree laser high-reflection pump light high lens 72, and enters the second laser crystal 62 together, thereby completing the second-level one-way amplification.

The signal light after the second-stage single-pass amplification is transmitted forward, and after being reflected by the 45 ° laser high-reflection mirror 55 and the third 45 ° laser high-reflection pump light high lens 73, the signal light and the pump light emitted by the third pump element 23 and transmitted by the third 45 ° laser high-reflection pump light high lens 73 are transmitted coaxially and enter the third laser crystal 63 together, thereby completing the third-stage single-pass amplification. The signal light having undergone the third-stage single-pass amplification is output to the laser.

The solid-state laser provided in this embodiment includes a two-way amplification optical path and two one-way amplification optical paths in total. In practical use, the number of the amplifying optical paths in the laser can be selected according to the required laser power, and a plurality of double-pass amplifying optical paths and/or single-pass amplifying optical paths are flexibly used to achieve the required laser power.

In this embodiment, the solid-state laser may further include a shaping element configured to shape a beam of the signal light so that a beam waist position of the signal light is located in the laser crystal; a shaping element may also be included that shapes the pump light emitted by the pump element such that the pump light is focused within the laser crystal. The shaping element comprises a collimating lens and/or a focusing lens.

The end-pumped solid-state laser provided by this embodiment includes multiple stages of laser amplification optical paths, and different from the prior art in which pumping elements in each stage of amplification optical path are located on the same side of the laser, adjacent pumping elements in this embodiment are spaced and located on the left and right sides of the laser, respectively, so that a small number of laser high-reflection mirrors can be used, and light emitted by a pumping source and signal light in each stage of amplification optical path are coaxial, thereby performing multiple stages of amplification on the signal light; the use of high laser reflecting mirrors and beam shaping elements is reduced, the optical path is shortened, the debugging difficulty of the laser is greatly reduced, the loss of the laser at all reflecting mirrors is reduced, the laser amplification power and the beam quality are improved, and the system stability of the laser is also greatly enhanced.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.