CN216529826U - Resonant cavity of all-solid-state laser and all-solid-state laser - Google Patents
Resonant cavity of all-solid-state laser and all-solid-state laser Download PDFInfo
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- CN216529826U CN216529826U CN202123165108.0U CN202123165108U CN216529826U CN 216529826 U CN216529826 U CN 216529826U CN 202123165108 U CN202123165108 U CN 202123165108U CN 216529826 U CN216529826 U CN 216529826U
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Abstract
The utility model discloses a resonant cavity of an all-solid-state laser and the all-solid-state laser, wherein the resonant cavity comprises: the laser gain medium has a certain extension length along the optical axis of the resonant cavity, and one end of the laser gain medium is provided with a first end face; the pumping source is arranged on one side of the laser gain medium and used for generating pumping light irradiating the laser gain medium; the light condensing assembly is arranged between the pumping source and the laser gain medium and is used for condensing the pumping light generated by the pumping source to obtain a light beam with reduced divergence; the light beam irradiates the first end face through the side surface of the laser gain medium, travels along the length extending direction of the laser gain medium after being reflected by the first end face, and is absorbed by the laser gain medium. In the utility model, the light condensing assembly converts pump light with larger divergence into near-parallel light, and the light is reflected by the first end face of the laser gain medium, so that the length of an absorption path is increased, the improvement of absorption efficiency is realized, and the temperature control requirement on a pump source is reduced.
Description
Technical Field
The utility model belongs to the technical field of lasers, and particularly relates to a resonant cavity of an all-solid-state laser and the all-solid-state laser.
Background
The all-solid-state laser is a solid-state laser using a semiconductor Laser (LD) as a pump source, and pump light generated by the pump source excites a solid-state laser material (i.e., a laser gain medium) to finally generate output laser. Generally, the solid-state laser material has a good absorption capability only for pump light in a specific wavelength range, but the central wavelength of the emission spectrum of the LD changes with the increase or decrease of temperature, the central wavelength drift ratio of the LD is usually 0.3 nm/deg.c, and when the operating environment temperature of the all-solid-state laser, especially the environment temperature around the pump source, changes, the output energy, the beam quality, the energy stability, etc. of the all-solid-state laser may fluctuate.
The temperature sensitivity of the LD causes poor environmental adaptability of the all-solid-state laser, and in the prior art, a water-cooling or semiconductor refrigerating sheet is required to perform small-environment temperature control on the LD serving as a pumping source. Meanwhile, the temperature of the working environment of the LD needs to be controlled, so that the starting time of the whole machine is long, and the addition of the temperature control system causes the size and the energy consumption of the whole machine to be large. If a temperature control system of the all-solid-state laser can be cancelled, the total power consumption of the whole machine is greatly reduced, the size is reduced, and the starting time is shortened, so that the requirements of complex industries of working environments such as military aerospace, laser medical treatment, laser processing and the like can be met. For this reason, how to realize a temperature-free design of an all-solid-state laser becomes one of the important research directions in the field.
In view of the above, the present invention is particularly proposed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides a resonant cavity of an all-solid-state laser and the all-solid-state laser, wherein a light-gathering component is arranged in the resonant cavity, pump light with a larger divergence angle is converted into a light beam close to parallel light, and the light beam is reflected by a first end surface of a laser gain medium so as to advance in the laser gain medium along the length extension direction of the laser gain medium, so that the length of an absorption path is increased, the absorption efficiency of the laser gain medium can be improved, and the all-solid-state laser can realize stable work at wide temperature.
In order to solve the technical problems, the utility model adopts the technical scheme that:
a resonant cavity of an all-solid-state laser, comprising:
the laser gain medium has a certain extension length along the optical axis of the resonant cavity, and one end of the laser gain medium is provided with a first end face;
the pumping source is arranged on one side of the laser gain medium and used for generating pumping light irradiating the laser gain medium;
the light condensing assembly is arranged between the pumping source and the laser gain medium and is used for condensing the pumping light generated by the pumping source to obtain a light beam with reduced divergence;
the light beam irradiates the first end face through the side surface of the laser gain medium, travels along the length extending direction of the laser gain medium after being reflected by the first end face, and is absorbed by the laser gain medium.
Furthermore, the size of an included angle between the first end face and the length extension direction of the laser gain medium is alpha, and the size of an included angle between the advancing direction of a light beam obtained after the pump light passes through the light-gathering component and the length extension direction of the laser gain medium is beta; wherein β is 2 α and α < 90 °.
Further, an included angle of 45 degrees is formed between the first end face and the length extending direction of the laser gain medium, and the light beam irradiates the first end face perpendicular to the length extending direction of the laser gain medium.
Further, the other end of the laser gain medium is provided with a second end face, and the second end face is arranged in parallel with the first end face.
Further, the length of the laser gain medium is more than or equal to 40 mm.
Furthermore, the pumping source comprises N laser diode bars which are arranged in parallel, and M laser emitting points which are distributed along the length direction of the laser diode bars are arranged on the laser diode bars.
Further, the light condensing assembly includes:
the first lens group is arranged between the pumping source and the laser gain medium and used for reducing the divergence angle of the pumping light in the first direction;
and the second lens group is arranged between the pumping source and the first lens group and used for reducing the divergence angle of the pumping light in a second direction, and the second direction is perpendicular to the first direction.
Further, the other end of the laser gain medium has a second end face, and the optical axis of the resonant cavity is further provided with:
the full-reflection cavity mirror is arranged at an interval with the second end face of the laser gain medium and used for reflecting received light;
and the output cavity mirror is arranged at a distance from the first end face of the laser gain medium and is used for partially reflecting and partially transmitting the received light.
Further, the optical axis of the resonant cavity is further provided with:
the polarization component is arranged between the full-reflection cavity mirror and the second end face of the laser gain medium and used for adjusting the polarization direction of light rays passing through the polarization component;
and the Q-switching component is arranged between the polarization component and the full-reflection cavity mirror and is used for switching the value of the quality factor in the resonant cavity.
It is another object of the present invention to provide an all-solid-state laser including a resonant cavity of the above-described all-solid-state laser.
After the technical scheme is adopted, compared with the prior art, the utility model has the following beneficial effects.
In the utility model, the light condensing assembly is arranged in the resonant cavity, the pump light with a larger divergence angle is converted into the light beam close to the parallel light, and the light beam is reflected by the first end surface of the laser gain medium, so that the light beam advances in the laser gain medium along the length extension direction of the laser gain medium, the length of an absorption path is increased, the absorption efficiency of the laser gain medium can be further improved, the influence of LD center wavelength drift caused by temperature change on the laser output stability is reduced, and the stable work of the all-solid-state laser under wide temperature can be realized.
In the utility model, the first end face and the second end face of the laser gain medium are parallel, namely, the distance between the first end face and the second end face is equal everywhere along the length direction of the laser gain medium, and when a beam formed by pump light passing through the light-gathering component irradiates any position on the first end face, absorption paths passing through the second end face are the same, thereby further ensuring the stability of output energy and laser beam quality.
According to the utility model, the light condensing assembly comprises the first lens group and the second lens group, and the first lens group and the second lens group converge the pump light along the mutually perpendicular directions, so that the divergence of the light beam can be reduced to the greatest extent, and the light beam close to parallel light is obtained, and the light beam can be absorbed by being close to the length direction of the laser gain medium as much as possible after being reflected by the first end surface.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model, are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model without limiting the utility model to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic diagram of the internal structure of a resonant cavity in an embodiment of the utility model;
FIG. 2 is a schematic diagram of the laser gain medium irradiated with pumping light generated by a pumping source according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a light-condensing assembly for condensing pump light according to an embodiment of the present invention.
In the figure: 1. an output cavity mirror; 2. a pump source; 3. a light focusing assembly; 31. a first lens group; 32. a second lens group; 4. a laser gain medium; 41. a first end face; 42. a second end face; 5. a polarizing component; 6. a Q-switching component; 7. a total reflection cavity mirror.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Embodiments of the utility model provide a resonant cavity and an all-solid-state laser comprising the resonant cavity. As shown in fig. 1, the resonant cavity comprises an output cavity mirror 1, a pumping source 2, a light condensing assembly 3, a laser gain medium 4, a polarization assembly 5, a Q-switching assembly 6 and a total reflection cavity mirror 7.
In this embodiment, the laser gain medium 4 is made of Nd: YAG crystal with a doping concentration of 1.1%. The pumping source 2 is a diode array with an output wavelength of 808nm, and specifically comprises N Laser Diode (LD) bars, and the N LD bars are arranged in parallel to form an area array. Each LD bar has M laser emission points distributed along its length direction, and each laser emission point emits light, thereby forming pump light that irradiates the laser gain medium 4.
When the all-solid-state laser is used, the environment temperature of the pumping source 2 is not required to be controlled by matching with a temperature control system, and the output energy fluctuation caused by the temperature drift of the central wavelength of the LD is avoided through the design of the internal structure of the resonant cavity. Specifically, in the scheme of this embodiment, the absorption path length of the laser gain medium 4 when absorbing the pump light is extended, so as to improve the absorption efficiency of the laser gain medium 4, and further, the stable operation of the all-solid-state laser at a wide temperature range can be realized.
As shown in fig. 1 to 3, in the resonator of the present embodiment, the optical axis of the resonator (indicated by the dashed-dotted line in fig. 1) extends horizontally, the laser gain medium 4 has a certain extension length along the optical axis of the resonator, and the left end of the laser gain medium 4 has a first end surface 41.
The pump source 2 is provided on one side of the laser gain medium 4, and generates pump light to be irradiated to the laser gain medium 4. The light condensing assembly 3 is arranged between the pump source 2 and the laser gain medium 4, and is used for condensing the pump light generated by the pump source 2 to obtain a light beam with reduced divergence.
Specifically, an area array composed of N LD bars on the pump source 2 is aligned to the light collecting assembly 3, and an initial divergence angle full angle of the pump light generated by the pump source 2 is: fast axis 70 °, slow axis 12 °, divergence angle thereof after passing through the light-focusing assembly 3 changes to: the fast axis is less than 2 deg., the slow axis is less than 2 deg., and a beam of nearly parallel light is formed. The light beam can be uniformly irradiated on the laser gain medium 4, so that the divergence loss of the pump light is reduced, and the utilization rate of the energy of the pump light is improved.
Further, the beam is irradiated from the side surface of the laser gain medium 4, and the beam is irradiated on the first end surface 41 through the side surface of the laser gain medium 4, reflected by the first end surface 41, travels in the longitudinal extending direction of the laser gain medium 4, and is absorbed by the laser gain medium 4.
By the above mode, the pump light can be reflected by the first end face 41 of the laser gain medium 4 after being converged by the light condensing assembly 3, and then travels along the length extending direction of the laser gain medium 4, the extension of the absorption path is realized by adopting a side pumping mode, and the side pumping is also beneficial to realizing larger output power while the wide temperature area work of the all-solid-state laser is realized.
Meanwhile, the above way of absorbing the pump light is beneficial to the uniform diffusion of the heat inside the laser gain medium 4, so that the problem caused by the overlarge thermal focal length of the crystal serving as the laser gain medium 4 in the existing all-solid-state laser can be improved.
In order to satisfy the requirement that the light beam irradiated from the side surface of the laser gain medium 4 can be reflected by the first end surface 41, the first end surface 41 in this embodiment is an inclined surface, and the angle between the inclined surface and the length extending direction of the laser gain medium 4 is α, and α < 90 °. Further, in order to realize that the light beam reflected by the first end surface 41 can travel along the longitudinal extension direction of the laser gain medium 4, the size of an included angle between the travel direction of the light beam passing through the light collecting component 3 and the longitudinal extension direction of the laser gain medium 4 is β, and β is 2 α.
Specifically, in the present embodiment, the first end surface 41 forms an angle of 45 ° with the longitudinal extension direction of the laser gain medium 4, and the light beam is irradiated onto the first end surface 41 perpendicular to the longitudinal extension direction of the laser gain medium 4. The structure can realize the purpose that the pump light travels and is absorbed along the length direction of the laser gain medium 4, and is convenient for the arrangement of each functional component in the resonant cavity.
In a preferred embodiment of the present embodiment, the right end of the laser gain medium 4 has a second end face 42, and the second end face 42 is parallel to the first end face 41. In this way, the distances between the first end surface 41 and the second end surface 42 are equal at all positions, and when the light beam irradiates any position on the first end surface 41, the absorption paths through which the light beam reaches the second end surface 42 after being reflected by the first end surface 41 are the same, so that the stability of the output energy and the quality of the output laser can be further ensured.
In this embodiment, the length of the laser gain medium 4 is not less than 40mm, and the length specifically refers to a distance between the first end surface 41 and the second end surface 42 along the length direction of the laser gain medium 4 (i.e., the optical axis direction of the resonant cavity), which is also equivalent to the absorption path length of the laser gain medium 4 for the pump light. When the length of the absorption path reaches 40mm, the laser gain medium 4 made of the Nd: YAG crystal in this embodiment can realize efficient absorption of pump light in a wide wavelength range, and further can realize stable operation at a wide temperature.
In this embodiment, an area array formed by a plurality of LD bars is used as the pumping source 2, so that a larger output power can be realized, and the all-solid-state laser of this embodiment can be adapted to applications in multiple fields. However, since the pump light is composed of light emitted from a plurality of laser emission points, the initial emission angle is large, and the directions of the pump light when the pump light irradiates the laser gain medium 4 are not uniform, a part of the pump light overflows before being sufficiently absorbed by the laser gain medium 4.
In the present embodiment, the pump light is converged by the light converging component 3, so that the above problem is solved. Specifically, the light concentration assembly 3 includes:
a first lens group 31 disposed between the pump source 2 and the laser gain medium 4 for reducing a divergence angle of the pump light in the first direction;
and a second lens group 32 disposed between the pumping source 2 and the first lens group 31, for reducing a divergence angle of the pumping light in a second direction, which is perpendicular to the first direction.
In detail, the initial divergence angle full angle of the pump light in this embodiment is: the fast axis is 70 degrees, the slow axis is 12 degrees, the first lens group 31 is used for reducing the divergence angle of the slow axis, and the second lens group 32 is used for reducing the divergence angle of the fast axis, so that the divergence angle of the finally obtained light beam on the fast axis and the slow axis is smaller than 2 degrees, and the finally obtained light beam uniformly irradiates on the laser gain medium 4 in the form of near parallel light. Therefore, the energy consumption of the pump light is effectively reduced, the absorption efficiency is more average, and the problem of large laser energy fluctuation of the all-solid-state laser in the prior art is solved.
In order to achieve compression of the divergence angle in both the fast axis and the slow axis directions, the first lens group 31 and the second lens group 32 in the present embodiment employ cylindrical lenses. Specifically, the first lens group 31 and the second lens group 32 are respectively a plano-convex cylindrical lens, and cylindrical axes of the two plano-convex cylindrical lenses are perpendicular to each other, so that the compression of divergence angles in two directions of a fast axis and a slow axis of pump light is realized. In this embodiment, the light condensing assembly 3 is made of ZF6 and ZF2 high refractive index glass to realize a miniaturized design of a product.
In a further aspect of this embodiment, the fully-reflecting cavity mirror 7 is disposed on the optical axis of the resonant cavity, is close to the right end of the resonant cavity, and is spaced apart from the second end face 42 of the laser gain medium 4, and is configured to reflect the received light. The output cavity mirror 1 is disposed on the optical axis of the resonant cavity, is close to the left end of the resonant cavity, is spaced apart from the first end surface 41 of the laser gain medium 4, and is configured to partially reflect and partially transmit the received light.
The polarization component 5 and the Q-switching component 6 are also arranged on the optical axis of the resonant cavity. The polarization component 5 is arranged between the full-reflection cavity mirror 7 and the second end face 42 of the laser gain medium 4 and is used for adjusting the polarization direction of light rays passing through the polarization component 5; and the Q-switching component 6 is arranged between the polarization component 5 and the full-reflection cavity mirror 7 and is used for switching the value of the quality factor in the resonant cavity.
The laser gain medium 4 absorbs the pump light and generates light in the resonant cavity, the light in the resonant cavity is reflected after reaching the full-reflection cavity mirror 7, part of the light can be transmitted to form output laser when reaching the output cavity mirror 1, and part of the light is reflected and continues to oscillate in the resonant cavity. The output cavity mirror 1, the total reflection cavity mirror 7 and the polarization component 5 are made of K9 glass, and the Q-switching component 6 is a lithium niobate crystal.
The all-solid-state laser of the present embodiment has the above-mentioned resonant cavity, and due to the structural design inside the resonant cavity, the absorption path length of the laser gain medium 4 is increased, so that the influence of the central wavelength drift of the LD caused by temperature change on the laser output stability can be reduced. In the embodiment, the change of the absorption efficiency of the laser gain medium 4 is less than 20% within the working temperature range of-40-60 ℃, and the change rate of the output energy is less than 5% by applying the all-solid-state laser to a circuit compensation measure.
The all-solid-state laser of the embodiment eliminates a temperature control system in the existing all-solid-state laser, and can ensure that the output energy, the beam quality and the energy stability of the all-solid-state laser are maintained at a level equivalent to those of the laser with the temperature control system in a wider temperature range. Therefore, the total power consumption of the all-solid-state laser can be greatly reduced, the size is reduced to achieve the miniaturization design, meanwhile, the starting time can be shortened, the demand of instant use can be met, the all-solid-state laser can be used under various complex working environments, and the application field of the all-solid-state laser is expanded.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (10)
1. A resonant cavity for an all-solid-state laser, comprising:
the laser gain medium has a certain extension length along the optical axis of the resonant cavity, and one end of the laser gain medium is provided with a first end face;
the pumping source is arranged on one side of the laser gain medium and used for generating pumping light irradiating the laser gain medium;
the light condensing assembly is arranged between the pumping source and the laser gain medium and is used for condensing the pumping light generated by the pumping source to obtain a light beam with reduced divergence;
the light beam irradiates the first end face through the side surface of the laser gain medium, travels along the length extending direction of the laser gain medium after being reflected by the first end face, and is absorbed by the laser gain medium.
2. The resonant cavity of the all-solid-state laser according to claim 1, wherein an angle between the first end surface and a length extending direction of the laser gain medium is α, and an angle between a traveling direction of a beam obtained after the pump light passes through the light condensing assembly and the length extending direction of the laser gain medium is β; wherein β is 2 α and α < 90 °.
3. The resonant cavity of claim 2, wherein the first end facet forms an angle of 45 ° with respect to the longitudinal extension of the laser gain medium, and the beam impinges on the first end facet perpendicular to the longitudinal extension of the laser gain medium.
4. The resonant cavity of an all-solid-state laser according to claim 2, wherein the other end of the laser gain medium has a second end surface, and the second end surface is disposed parallel to the first end surface.
5. The resonant cavity of an all-solid-state laser according to any one of claims 1 to 4, wherein the length of the laser gain medium is equal to or greater than 40 mm.
6. The resonant cavity of an all-solid-state laser according to any one of claims 1 to 4, wherein the pump source comprises N laser diode bars arranged in parallel, and the laser diode bars have M laser emission points distributed along the length direction thereof.
7. The resonant cavity of an all-solid-state laser according to claim 6, wherein the light focusing assembly comprises:
the first lens group is arranged between the pumping source and the laser gain medium and used for reducing the divergence angle of the pumping light in the first direction;
and the second lens group is arranged between the pumping source and the first lens group and used for reducing the divergence angle of the pumping light in a second direction, and the second direction is perpendicular to the first direction.
8. The resonant cavity of an all-solid-state laser according to any one of claims 1 to 4, wherein the other end of the laser gain medium has a second end surface, and further comprising, on an optical axis of the resonant cavity:
the full-reflection cavity mirror is arranged at an interval with the second end face of the laser gain medium and used for reflecting received light;
and the output cavity mirror is arranged at a distance from the first end face of the laser gain medium and is used for partially reflecting and partially transmitting the received light.
9. The resonant cavity of an all-solid-state laser according to claim 8, further comprising, disposed on an optical axis of the resonant cavity:
the polarization component is arranged between the full-reflection cavity mirror and the second end face of the laser gain medium and used for adjusting the polarization direction of light rays passing through the polarization component;
and the Q-switching component is arranged between the polarization component and the full-reflection cavity mirror and is used for switching the value of the quality factor in the resonant cavity.
10. An all-solid-state laser comprising the resonant cavity of the all-solid-state laser of any one of claims 1-9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117595049A (en) * | 2024-01-18 | 2024-02-23 | 长春理工大学 | Irregularly-shaped multi-pass gain laser system, laser and laser radar |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117595049A (en) * | 2024-01-18 | 2024-02-23 | 长春理工大学 | Irregularly-shaped multi-pass gain laser system, laser and laser radar |
| CN117595049B (en) * | 2024-01-18 | 2024-04-05 | 长春理工大学 | Irregularly-shaped multi-pass gain laser system, laser and laser radar |
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