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CN-121813095-B - CALGO crystal regeneration cavity and assembling and adjusting method thereof

CN121813095BCN 121813095 BCN121813095 BCN 121813095BCN-121813095-B

Abstract

The invention discloses a CALGO crystal regeneration cavity and an adjusting method thereof, and relates to the technical field of lasers. The regeneration cavity comprises a seed source, an isolator, a polarization spectroscope, a polarization control component, a first cavity mirror, a self-imaging component, a gain medium, a dichroic mirror, a second cavity mirror, a pumping source, an equivalent short cavity mirror, a low-power consumption mirror and a power meter. And an equivalent short cavity is established through the equivalent short cavity reflector and the second cavity mirror, the cavity length is prolonged through the self-imaging component, and the dynamic feedback adjustment of the low-power-consumption reflector and the power meter is realized, so that the reproduction and amplification output of the femtosecond laser with easy adjustment, high stability, wide spectrum and high power is realized.

Inventors

  • WANG CONGKE
  • Zha Gensheng
  • Shu Qingbang
  • WANG PINGYANG
  • WANG HAOTIAN
  • QIN WEILIN

Assignees

  • 安徽华创鸿度光电科技有限公司

Dates

Publication Date
20260512
Application Date
20260306

Claims (8)

  1. 1. The CALGO crystal regeneration cavity is characterized by comprising a seed source (1), an isolator (2), a polarization spectroscope (3), a polarization control component (4), a first cavity mirror (5), a self-imaging component (6), a gain medium (7), a bicolor mirror (8), a second cavity mirror (9) and a pumping source (10), wherein: the seed source (1) is sequentially connected with the isolator (2) and the polarizing spectroscope (3) in an optical path; the polarization control component (4) is arranged between the polarization spectroscope (3) and the first cavity mirror (5) and is used for adjusting the polarization state of the light beam; A gain medium (7) and a bicolor mirror (8) are arranged between the second cavity mirror (9) and the self-imaging component (6); The pump source (10) is used for pumping the gain medium (7); The self-imaging component (6) is arranged between the polarization spectroscope (3) and the gain medium (7) and is used for forming a foldback light path to prolong the cavity length of the regeneration cavity and imaging the light beam state at the corresponding position of the gain medium (7) to the position of the first cavity mirror (5); The first cavity mirror (5) and the second cavity mirror (9) form the boundary of a long cavity regeneration cavity.
  2. 2. A CALGO crystal recycling cavity according to claim 1, wherein the polarization control assembly (4) comprises a quarter wave plate (401) and a pockels cell (402).
  3. 3. A CALGO crystal recycling cavity according to claim 1, characterized in that the gain medium (7) is ytterbium-doped crystal Yb CALGO.
  4. 4. A CALGO crystal recycling cavity according to claim 3, characterized in that the gain medium (7) is welded to a copper gold-plated heat sink and is connected to an external circulation water cooling system.
  5. 5. A CALGO crystal recycling cavity according to claim 1, wherein the pump source (10) is a high-power semiconductor laser.
  6. 6. A CALGO crystal recycling cavity according to claim 1, wherein the self-imaging assembly (6) comprises at least two imaging mirrors and a plurality of planar mirrors.
  7. 7. A CALGO crystal recycling cavity according to claim 2, wherein the isolator (2) is provided with an escape port, and the polarization control assembly (4) switches the polarization state of the light beam under a preset condition, so that the amplified light beam is output through the escape port of the isolator (2).
  8. 8. A method of tuning a CALGO crystal regeneration chamber as defined in claim 7, comprising the steps of: step one, light of the seed source (1) is used as reference light to perform light path reference calibration; Step two, inserting an equivalent short cavity reflector (11) at a corresponding position of the gain medium (7), and forming a short resonant cavity between the equivalent short cavity reflector (11) and the second cavity mirror (9); turning off the seed source (1), and inserting a low-loss reflector (12) into the short resonant cavity; Pumping the gain medium (7), and adjusting the equivalent short cavity reflector (11) to enable the short resonant cavity to vibrate; Step five, removing an equivalent short cavity reflecting mirror (11), adjusting a second cavity reflecting mirror (9), detecting the power of light reflected by a low-loss reflecting mirror (12), and removing the low-loss reflecting mirror (12) after the long cavity regenerating cavity is adjusted when the highest long cavity vibration starting power is detected; Step six, starting the seed source (1) to inject seed light, adjusting driving parameters of the polarization control component (4), and optimizing the regeneration amplification output.

Description

CALGO crystal regeneration cavity and assembling and adjusting method thereof Technical Field The invention relates to the technical field of lasers, in particular to a CALGO crystal regeneration cavity and an assembling and adjusting method thereof. Background The femtosecond regeneration amplification technology realizes the energy promotion of the ultra-short pulse through the regeneration amplification cavity. The core is that seed pulse is injected into the cavity, the pulse is controlled by an optical switch (such as a Prkerr box) to pass through the gain medium for multiple times, the energy is amplified successively through stimulated radiation, and finally high-energy femtosecond pulse is output. The current femtosecond regeneration cavity has long ascending and descending delay time of electro-optic drive, so that the cavity length of the regeneration cavity is designed to be long and is generally 1.5 meters or more, an unstable area of ascending and descending delay of the electro-optic can be avoided, the resonant cavity is difficult to mount and vibrate due to the long cavity length, the stability is also poor, and further, seed injection is difficult to realize effective regeneration amplification, and the power stability is poor. In addition, the problem of narrowing the amplified spectrum of the femtosecond laser, which leads to an increase in the minimum value of pulse width compression after amplification, is also a major problem of the femtosecond laser. Disclosure of Invention The invention aims to solve the problems that the long cavity length in the background technology causes difficult assembly and vibration starting of a resonant cavity and poor stability, and provides a CALGO crystal regeneration cavity and an assembly and adjustment method thereof. According to a first aspect of the invention, a CALGO crystal recycling cavity is provided, the recycling cavity comprises a seed source, an isolator, a polarization spectroscope, a polarization control component, a first cavity mirror, a self-imaging component, a gain medium, a dichroic mirror, a second cavity mirror and a pumping source, wherein: The seed source is sequentially connected with the isolator and the polarization spectroscope through the light path; the polarization control component is arranged between the polarization spectroscope and the first cavity mirror and used for adjusting the polarization state of the light beam; The gain medium and the bicolor mirror are arranged between the second cavity mirror and the self-imaging component; The pumping source is used for pumping the gain medium; the self-imaging component is arranged between the polarization spectroscope and the gain medium, and is used for forming a foldback light path to prolong the physical cavity length of the regeneration cavity and imaging the light beam state at the corresponding position of the gain medium to the position of the first cavity mirror; The first and second mirrors form the boundary of the long cavity regeneration cavity. Specifically, the polarization control assembly includes a quarter wave plate and a pockels cell. Specifically, the gain medium adopts ytterbium-doped crystal Yb CALGO. Specifically, the gain medium is welded on the copper gold-plated heat sink and is connected with the external circulation water cooling system. Specifically, the pump source adopts a high-power semiconductor laser. Specifically, the self-imaging assembly includes at least two imaging mirrors and a plurality of planar mirrors. Specifically, the isolator is provided with an escape port, and the polarization control assembly switches the polarization state of the light beam under a preset condition, so that the amplified light beam is output through the escape port of the isolator. In a second aspect of the present invention, there is provided a method for adjusting CALGO crystal regeneration cavities, the method comprising: Step one, light path reference calibration is carried out by taking light of a seed source as reference light; Inserting an equivalent short cavity reflector at a corresponding position of the gain medium, and forming a short resonant cavity between the equivalent short cavity reflector and the second cavity reflector; Turning off the seed source, and inserting a low-loss reflector into the short resonant cavity; pumping the gain medium, and adjusting an equivalent short cavity reflector to enable the short resonant cavity to vibrate; Step five, removing an equivalent short-cavity reflecting mirror, adjusting a second cavity mirror, detecting the power of light reflected by the low-loss reflecting mirror, and removing the low-loss reflecting mirror after the long-cavity regenerating cavity is adjusted when the maximum long-cavity vibration starting power is detected; step six, starting a seed source to inject seed light, adjusting driving parameters of the polarization control component, and optimizing the regeneration amplification o