CN116581632A - Device and method for increasing cavity length of resonant cavity of solid laser - Google Patents

Device and method for increasing cavity length of resonant cavity of solid laser Download PDF

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Publication number
CN116581632A
CN116581632A CN202310056253.XA CN202310056253A CN116581632A CN 116581632 A CN116581632 A CN 116581632A CN 202310056253 A CN202310056253 A CN 202310056253A CN 116581632 A CN116581632 A CN 116581632A
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China
Prior art keywords
mirror
cavity
reflecting
laser
semi
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CN202310056253.XA
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Chinese (zh)
Inventor
王小发
吴玉琢
廖明铭
程子航
闫俪文
张雪峰
陈俊安
刘颖
陈玉婷
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Chongqing University of Post and Telecommunications
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Chongqing University of Post and Telecommunications
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Priority to CN202310056253.XA priority Critical patent/CN116581632A/en
Publication of CN116581632A publication Critical patent/CN116581632A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/105—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
    • H01S3/0813—Configuration of resonator
    • H01S3/0815—Configuration of resonator having 3 reflectors, e.g. V-shaped resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/163—Solid materials characterised by a crystal matrix

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Lasers (AREA)

Abstract

The invention discloses a device and a method for increasing the cavity length of a resonant cavity of a solid laser, and belongs to the technical field of solid lasers. The device mainly comprises a reflecting cavity mirror, a high-gain laser amplifying module, a semi-transparent semi-reflecting mirror, an output mirror and other components, wherein the reflecting cavity mirror is used for reflecting light beams in a cavity; the high-gain laser amplification module is used for emitting fluorescence; the half-mirror is used for splitting light; the output mirror is used for enabling the light beam in the cavity to oscillate between the reflecting cavity mirror and the output mirror, and generating laser output after reaching a threshold value; the method is different from the common compound cavity in that the light beam only forms positive feedback between the half-mirror and the reflecting cavity mirror without forming oscillation, and the cavity length is prolonged by improving the photon service life in the cavity. The device is simple, and can realize stable output under long-cavity operation without a telescope system. The method is flexible and has strong expansibility.

Description

Device and method for increasing cavity length of resonant cavity of solid laser
Technical Field
The invention relates to the technical field of laser, in particular to a device and a method for increasing the cavity length of a resonant cavity of a solid laser.
Background
The solid laser is a laser using solid materials as working substances, and has the characteristics of high luminous efficiency, compact structure, stable performance, wide output laser spectrum range, no pollution and the like. In the laser technology field, people usually use telescope systems, optical delay lines, pyramid prisms, compound cavities and other methods to realize long cavities. However, these methods are generally complex in structure and large in volume, and the existing most technologies are difficult to obtain ultra-long resonant cavities.
The invention designs a device and a method for increasing the cavity length of a resonant cavity of a solid laser, which are simple and can realize stable output under the condition of no telescope system. The number, the transmittance and the placement positions of the used half-lenses can be configured according to the requirements of different cavity lengths, and the method has the advantages of flexibility and strong expansibility.
CN203233045U, a solid state laser with annular mirror for focused seed injection, comprising: the output mirror (1), the first annular reflecting mirror (2), the second annular reflecting mirror (6), the annular solid laser gain medium (3), the annular lens at the total reflection end (4) and the total reflecting mirror (5) are sequentially arranged on the light path; a resonant cavity is formed between the output mirror (1) and the total reflection mirror (5).
1. The objective is to increase the emitted power of the laser.
The invention aims to increase the cavity length of a resonant cavity.
2. According to the method, the sectional area of the gain medium is increased, the emergent light of the external annular solid laser gain medium is adjusted to the direction of a light path through a plurality of total reflectors, and the emergent light is reflected to the light path of the emergent light of the internal cylindrical solid laser gain medium, so that the power is improved.
The invention uses the semi-transparent and semi-reflective mirror and the reflective cavity mirror to form positive feedback, the non-resonant cavity formed by the semi-transparent and semi-reflective mirror and the reflective cavity mirror repeatedly amplifies the fluorescence in the cavity, part of amplified light can reach the output mirror through the semi-transparent and semi-reflective mirror, so that the output mirror and the reflective cavity mirror form a resonant cavity to form stable oscillation, and the laser output under the long-cavity operation is realized.
3. The effect is different, the transmission power of the patent is fixed by increasing the cross-sectional area of the gain medium.
The number, the transmittance and the placement positions of the half-mirrors used in the invention can be configured according to the requirements of different cavity lengths, and the invention has the advantages of flexible method and strong expansibility.
Disclosure of Invention
The present invention is directed to solving the above problems of the prior art. A device and a method for increasing the cavity length of a resonant cavity of a solid laser are provided. The technical scheme of the invention is as follows:
an apparatus for increasing the cavity length of a solid state laser resonator, comprising: the laser device comprises a reflecting cavity mirror (1), a high-gain laser amplifying module (2), a semi-transparent semi-reflecting mirror (3), an output mirror (4), fluorescence (5), laser (6), a short cavity (7) and a long cavity (8), wherein the reflecting cavity mirror (1) is used for reflecting light beams in the cavity; the high-gain laser amplification module (2) is used for emitting fluorescence; the semi-transparent semi-reflecting mirror (3) is used for splitting light; the output mirror (4) is used for enabling the light beam in the cavity to oscillate between the reflecting cavity mirror (1) and the output mirror (4) and generating laser output after reaching a threshold value;
fluorescence emitted by the high-gain laser amplification module (2) acts on the reflecting cavity mirror (1) and returns to form double-pass amplification through the high-gain laser amplification module (2); the light amplified by the double pass is partially returned when passing through the half-mirror (3), the half-mirror (3) and the reflecting cavity mirror (1) form a non-resonant cavity, and the fluorescence (5) amplified for multiple times is obtained at the moment; the light amplified for many times passes through the semi-transparent semi-reflecting mirror (3) to reach the output mirror (4) at a distance, and the output mirror (4) and the reflecting cavity mirror (1) form a resonant cavity to form oscillation output laser (6), so that the laser output under the long cavity operation is realized, and the resonant cavity is increased from the original short cavity (7) to the existing long cavity (8).
Further, the high-gain laser amplification module (2) comprises a pumping source and a gain medium, and the pumping source plays a role in energy excitation of the gain medium; the pump source provides energy to the gain medium to cause it to fluoresce.
Further, the half-mirror (3) is arranged between the reflecting cavity mirror (1) and the high-gain laser amplifying module (2) or/and between the high-gain laser amplifying module (2) and the output mirror (4).
Further, the light beam forms positive feedback between the reflecting cavity mirror (1) and the half mirror (3), while the light beam forms oscillation in the outer cavity between the reflecting cavity mirror (1) and the output mirror (4).
Further, the ratio of the transmittance T to the reflectance R of the half mirror (3) can be any ratio according to the requirements of different situations; the semi-transparent and semi-reflective mirror (3) is a device with a reflection and transmission function; the number of the semi-transparent and semi-reflective mirrors (3) can be single or multiple; the number of the semi-transparent and semi-reflecting mirrors (3) at two sides of the high-gain laser amplification module (2) can be symmetrical or asymmetrical.
Furthermore, the light returned to the high-gain laser amplification module (2) through the half mirror (3) can be laser or fluorescence.
Further, the pumping mode in the high-gain laser amplification module (2) comprises end-face pumping, side-face pumping, continuous pumping, pulse pumping or other types of pumping modes.
Further, the gain medium adopts Nd: YVO 4 Crystals, nd: YLF crystals, nd: YAG crystals, nd: KGW crystals, and the like.
Further, the optical path formed by the reflecting cavity mirror (1) and the semi-transparent semi-reflecting mirror (3) and the optical path formed by the reflecting cavity mirror (1) and the output mirror (4) are the same optical path.
A method of implementing an apparatus according to any one of the preceding claims, comprising the steps of:
s1: in the high-gain laser amplification module (2), a pumping source provides energy for a gain medium so as to emit fluorescence;
s2: the fluorescence emitted by the S1 acts on the reflecting cavity mirror (1) and returns to form double-pass amplification through the high-gain laser amplification module (2);
s3: the light amplified by the double pass is partially returned when passing through the half-mirror (3), the half-mirror (3) and the reflecting cavity mirror (1) form a non-resonant cavity, and the fluorescence (5) amplified for multiple times can be obtained at the moment;
s4: the light amplified for many times can reach the output mirror (4) at a distance through the semi-transparent semi-reflecting mirror (3), the output mirror (4) and the reflecting cavity mirror (1) form a resonant cavity, which is equivalent to improving the photon service life in the cavity on the basis of the original resonant cavity, so that photons can reach the output mirror (4) at a long distance to form oscillation output laser (6), thereby realizing laser output under long-cavity operation, and the resonant cavity is increased from the original short cavity (7) to the current long cavity (8).
The invention has the advantages and beneficial effects as follows:
the invention relates to a device and a method for increasing the cavity length of a resonant cavity of a solid laser. The fluorescence in the cavity is repeatedly amplified by utilizing a non-resonant cavity formed by the semi-transparent semi-reflecting mirror and the reflecting cavity mirror. And part of amplified light can reach the output mirror through the semi-transparent semi-reflecting mirror, so that the output mirror and the reflecting cavity mirror form a resonant cavity to form stable oscillation, and laser output under long-cavity operation is realized.
The invention relates to a device and a method for increasing the cavity length of a resonant cavity of a solid laser. The fluorescence in the cavity is repeatedly amplified by utilizing a non-resonant cavity formed by the semi-transparent semi-reflecting mirror and the reflecting cavity mirror, and part of amplified light can reach the output mirror through the semi-transparent semi-reflecting mirror, so that the output mirror and the reflecting cavity mirror form a resonant cavity to form stable oscillation, and the laser output under long-cavity operation is realized. The device is simple, and can realize stable output under long-cavity operation without a telescope system. The number, the transmittance and the placement positions of the used half-lenses can be configured according to the requirements of different cavity lengths, and the method has the advantages of flexibility and strong expansibility.
Drawings
Fig. 1 shows a semiconductor laser according to a preferred embodiment of the present invention for energizing a gain medium to fluoresce and act back on a reflective cavity mirror to form a two-pass amplification.
FIG. 2 shows a partial return of light in the cavity as it passes through the half mirror, forming a non-resonant cavity with the reflective cavity mirror.
FIG. 3 shows a portion of the multiple amplified light transmitted through the half mirror to the output mirror, where the output mirror and the reflective cavity mirror form a resonant cavity, resulting in a stable laser output.
Fig. 4 is a schematic diagram of a long cavity formed by adding half mirrors on both sides of a high gain laser amplification module.
Marked in the figure as: 1. reflecting cavity mirror 2, high gain laser amplifying module 3, semi-transparent and semi-reflective mirror 4 and output mirror
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and specifically described below with reference to the drawings in the embodiments of the present invention. The described embodiments are only a few embodiments of the present invention.
The technical scheme for solving the technical problems is as follows:
an apparatus and method for increasing the cavity length of a resonant cavity of a solid-state laser, comprising: the high-gain laser amplification module 2 comprises a pumping source and a gain medium, wherein the pumping source provides energy for the gain medium to enable the gain medium to emit fluorescence. The specific implementation method comprises the following steps: s1: in the high gain laser amplification module 2, the pump source provides energy to the gain medium to cause it to fluoresce. S2: the fluorescence emitted by the S1 acts on the reflecting cavity mirror 1 and returns to pass through the high-gain laser amplification module 2 to form double-pass amplification. S3: the light amplified by the double pass is partially returned when passing through the half mirror 3, and at the moment, the half mirror 3 and the reflecting cavity mirror 1 form a non-resonant cavity, and the fluorescence in the light is amplified for multiple times. S4: part of the light amplified many times can pass through the half-mirror 3 to reach the output mirror 4 at a distance, and the output mirror 4 and the reflecting cavity mirror 1 form a resonant cavity at the moment. On the basis of the original resonant cavity, the service life of photons in the cavity is prolonged, so that photons can reach the output mirror 4 at a long distance to form oscillation output laser, and the laser output under long-cavity operation is realized.
The reflecting cavity mirror 1 is used for reflecting the light beams in the cavity; the half-mirror 3 is used for splitting light; the output mirror 4 is used for enabling the light beam in the cavity to oscillate between the reflecting cavity mirror 1 and the output mirror 4, and generating laser output after reaching a threshold value.
Preferably, the half mirror 3 may be located between the reflecting cavity mirror 1 and the high-gain laser amplification module 2, or may be located between the high-gain laser amplification module 2 and the output mirror 4, or both.
Preferably, the light beam forms positive feedback between the reflecting cavity mirror 1 and the half mirror 3, while the light beam forms oscillations in the outer cavity between the reflecting cavity mirror 1 and the output mirror 4.
Preferably, the ratio of the transmittance T to the reflectance R of the half mirror 3 may be any ratio according to the needs of different situations. The half mirror 3 includes other devices with reflection and transmission functions, such as a polarizer, etc. The number of the half mirrors 3 may be single or plural. The number of the half-mirror and the half-mirror 3 on two sides of the high-gain laser amplification module 2 can be symmetrical or asymmetrical.
Preferably, the light returned to the high-gain laser amplification module 2 through the half mirror 3 may be laser light or fluorescence light.
Preferably, the pumping mode in the high-gain laser amplification module 2 may be end-face pumping, side-face pumping, continuous pumping, pulse pumping, or other types of pumping modes.
Preferably, the gain medium can be Nd: YVO 4 Crystal, nd: YLF crystal, nd: YAG crystal, nd: KGW crystal, and the like.
Preferably, the optical path formed by the reflecting cavity mirror 1 and the half-mirror 3 is the same as the optical path formed by the reflecting cavity mirror 1 and the output mirror 4.
The following are specific examples: preferred embodiment 1: as a preferred embodiment, the radius of curvature of the reflecting cavity mirror 1 is 2500mm, the surface is coated with a highly reflective film, and the reflectivity is higher than 99%. The high-gain laser amplifying module 2 is composed of a gain medium and a semiconductor laser, wherein the gain medium adopts Nd-YAG crystal rods, the maximum output power of the semiconductor laser is 60W, and the gain medium is used as an excitation source of Nd-YAG crystals in the module to realize the population inversion. The half mirror 3 has transmittance: reflectivity = 50: 50. The output mirror 4 is a flat mirror with a transmittance of 30%.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separable, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In summary, the invention researches a device and a method for increasing the cavity length of a resonant cavity of a solid laser, and fluorescence in the cavity is repeatedly amplified by utilizing a non-resonant cavity formed by a semi-transparent semi-reflecting mirror and a reflecting cavity mirror. The light after partial amplification can reach the output mirror through the semi-transparent semi-reflecting mirror, so that the output mirror and the reflecting cavity mirror form a resonant cavity, the service life of photons in the cavity is prolonged on the basis of the original resonant cavity, the photons can reach the output mirror at a long distance to form oscillation output laser, the resonant cavity is increased from an original short cavity to a long cavity, and laser output under the operation of the long cavity is realized.
The system, apparatus, module or unit set forth in the above embodiments may be implemented in particular by a computer chip or entity, or by a product having a certain function. One typical implementation is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The above examples should be understood as illustrative only and not limiting the scope of the invention. Various changes and modifications to the present invention may be made by one skilled in the art after reading the teachings herein, and such equivalent changes and modifications are intended to fall within the scope of the invention as defined in the appended claims.

Claims (10)

1. An apparatus for increasing the cavity length of a solid state laser resonator, comprising: the laser device comprises a reflecting cavity mirror (1), a high-gain laser amplifying module (2), a semi-transparent semi-reflecting mirror (3), an output mirror (4), fluorescence (5), laser (6), a short cavity (7) and a long cavity (8), wherein the reflecting cavity mirror (1) is used for reflecting light beams in the cavity; the high-gain laser amplification module (2) is used for emitting fluorescence; the semi-transparent semi-reflecting mirror (3) is used for splitting light; the output mirror (4) is used for enabling the light beam in the cavity to oscillate between the reflecting cavity mirror (1) and the output mirror (4), and laser output is generated after the threshold value is reached.
Fluorescence emitted by the high-gain laser amplification module (2) acts on the reflecting cavity mirror (1) and returns to form double-pass amplification through the high-gain laser amplification module (2); the light amplified by the double pass is partially returned when passing through the half-mirror (3), the half-mirror (3) and the reflecting cavity mirror (1) form a non-resonant cavity, and the fluorescence (5) amplified for multiple times is obtained at the moment; the light amplified for many times passes through the semi-transparent semi-reflecting mirror (3) to reach the output mirror (4) at a distance, and the output mirror (4) and the reflecting cavity mirror (1) form a resonant cavity to form oscillation output laser (6), so that the laser output under the long cavity operation is realized, and the resonant cavity is increased from the original short cavity (7) to the existing long cavity (8).
2. The device for increasing the cavity length of a solid-state laser resonator according to claim 1, wherein the high-gain laser amplification module (2) comprises a pump source and a gain medium, and the pump source is used for energy excitation of the gain medium; the pump source provides energy to the gain medium to cause it to fluoresce.
3. The device for increasing the cavity length of the solid laser resonant cavity according to claim 1, wherein the half mirror (3) is arranged between the reflecting cavity mirror (1) and the high-gain laser amplification module (2) or/and between the high-gain laser amplification module (2) and the output mirror (4).
4. A device for increasing the cavity length of a solid state laser according to claim 1, characterized in that the light beam forms positive feedback between the reflecting cavity mirror (1) and the half mirror (3) while the light beam forms oscillations in the outer cavity between the reflecting cavity mirror (1) and the output mirror (4).
5. A device for increasing the cavity length of a solid state laser according to claim 1, characterized in that the ratio of the transmittance T to the reflectance R of the half mirror (3) can be any ratio depending on the needs of the individual situation; the semi-transparent and semi-reflective mirror (3) is a device with a reflection and transmission function; the number of the semi-transparent and semi-reflective mirrors (3) can be single or multiple; the number of the semi-transparent and semi-reflecting mirrors (3) at two sides of the high-gain laser amplification module (2) can be symmetrical or asymmetrical.
6. The device for increasing the cavity length of a solid state laser according to claim 5, wherein the light returned to the high gain laser amplification module (2) via the half mirror (3) is either laser light or fluorescent light.
7. An arrangement for increasing the cavity length of a solid state laser as claimed in claim 1, characterized in that the pumping means in the high gain laser amplification module (2) comprise end-pumping, side-pumping, continuous pumping, pulsed pumping or other types of pumping means.
8. The device for increasing the cavity length of a solid-state laser according to claim 2, wherein the gain medium is nd:yvo 4 Crystals, nd: YLF crystals, nd: YAG crystals, nd: KGW crystals, and the like.
9. The device for increasing the cavity length of the solid laser resonator according to claim 1, wherein the optical path formed by the reflecting cavity mirror (1) and the semi-transparent semi-reflecting mirror (3) and the optical path formed by the reflecting cavity mirror (1) and the output mirror (4) are the same optical path.
10. A method of implementing an apparatus according to any one of claims 1-9, comprising the steps of:
s1: in the high-gain laser amplification module (2), a pumping source provides energy for a gain medium so as to emit fluorescence;
s2: the fluorescence emitted by the S1 acts on the reflecting cavity mirror (1) and returns to form double-pass amplification through the high-gain laser amplification module (2);
s3: the light amplified by the double pass is partially returned when passing through the half-mirror (3), the half-mirror (3) and the reflecting cavity mirror (1) form a non-resonant cavity, and the fluorescence (5) amplified for multiple times can be obtained at the moment;
s4: the light amplified for many times can reach the output mirror (4) at a distance through the semi-transparent semi-reflecting mirror (3), the output mirror (4) and the reflecting cavity mirror (1) form a resonant cavity, which is equivalent to improving the photon service life in the cavity on the basis of the original resonant cavity, so that photons can reach the output mirror (4) at a long distance to form oscillation output laser (6), thereby realizing laser output under long-cavity operation, and the resonant cavity is increased from the original short cavity (7) to the current long cavity (8).
CN202310056253.XA 2023-01-13 2023-01-13 Device and method for increasing cavity length of resonant cavity of solid laser Pending CN116581632A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310056253.XA CN116581632A (en) 2023-01-13 2023-01-13 Device and method for increasing cavity length of resonant cavity of solid laser

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Application Number Priority Date Filing Date Title
CN202310056253.XA CN116581632A (en) 2023-01-13 2023-01-13 Device and method for increasing cavity length of resonant cavity of solid laser

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CN116581632A true CN116581632A (en) 2023-08-11

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