Multi-rod symmetrical series connection cavity of solid laser

[0009] A specific implementation of the solid-state laser multi-rod symmetric series cavity of the present invention is as follows. The multi-rod symmetric series cavity is composed of a total reflection mirror, an output coupling mirror, and a crystal rod, and is optically coaxial, see Figure 4 As shown, there is a total reflection mirror at each end of the resonant cavity, and the output coupling mirror is located in the middle of the resonant cavity. The output coupling mirror adopts a half-transparent half-reflective mirror, which forms an angle of 45° with the optical axis. On the left and right sides of the output coupling mirror, between the output coupling mirror and the total reflection mirror at both ends of the resonant cavity, there are n identical crystal rods, n≤8. The crystal rod material is Nd:YAG, and the size of each crystal rod is Φ8mm×160mm. The n crystal rods on the left or right side of the output coupling mirror are connected in series and are symmetrical with respect to the laser output axis of the output coupling mirror. A total mirror is set on a laser output optical path of the output coupling mirror to realize unidirectional laser output. By pumping the crystal rods, the crystal rods are in a state of inversion of the particle beam, and one of the crystal rods will oscillate first to generate a laser signal. Taking the total mirror at the left end of the resonator as the zero point, the pump is controlled to make the leftmost crystal rod on the left side of the output coupling mirror vibrate first to generate a laser signal. After the laser signal is coherently amplified by each crystal rod on this side in turn, At the output coupling mirror, the light beam is divided into transmission and reflection, called the first light and the second light. The first light enters the right side of the output coupling mirror and is coherently amplified by the crystal rods on this side in turn, reflected by the total reflection mirror at the right end of the resonator, and the light beam is again coherently amplified by the crystal rods on this side in turn; At the coupling mirror, the beam is again divided into transmission and reflection. The transmitted light is coherently amplified by the crystal rods on the left side of the output coupling mirror and reflected by the total reflection mirror at the left end of the cavity; the reflected light is output and becomes stimulated coherent amplification Laser output. The second path of light enters the side opposite to the laser output direction, is reflected by the side total reflection mirror, and returns to the output coupling mirror. The beam is again divided into transmission and reflection paths. The reflected light is reflected by the crystals on the left side of the output coupling mirror. The rods are coherently amplified in sequence and reflected by the total mirror at the left end of the resonator; the transmitted light output becomes the stimulated coherent amplified laser output. Repeat this cycle and continue to oscillate.

[0010] Another specific implementation of the solid-state laser multi-rod symmetric series cavity of the present invention is as follows. The solid-state laser multi-rod symmetric series cavity consists of a total mirror, a crystal rod, and optical coaxial. See image 3 Shown. There is a total reflection mirror at both ends of the resonant cavity. The output coupling device adopts a Glan prism group and is located in the middle of the resonator. The Glan prism is a birefringent polarizing device whose function is to polarize and depolarize, and to reduce the o Output, and e-light oscillates in the cavity through the Glan prism. Between the Glan prism group and the total mirror at both ends of the resonant cavity, there is a group of crystal rods, the number is n, n≤8. The crystal rod material is Nd:YAG, and the size of each crystal rod is Φ8mm×160mm. Each group of n crystal rods are separated and connected in series. The two groups of crystal rods are symmetrical with respect to the laser output axis of the Glan prism group. They are matched with the Glan prism group. A 1/4λ is set in front of the total mirror at both ends of the resonant cavity. ±Δλ wave plate, the function of 1/4λ±Δλ wave plate is to convert linearly polarized light into elliptically polarized light. By pumping the crystal rods, the crystal rods are in a state of inversion of the particle beam, and one of the crystal rods will oscillate first to generate a laser signal. Taking the total mirror at the left end of the resonator as the zero point, the pump is controlled to make the leftmost crystal rod on the left side of the Glan prism group vibrate first to generate a laser signal. The laser signal is coherently amplified by each crystal rod on the side in turn. , Incident on the Glan prism group, the o light of the laser beam is output by the Glan prism group, while the e light passes through the Glan prism group and enters the right side of the Glan prism group, and is coherently amplified by each crystal rod on this side in turn. After passing through the 1/4λ±Δλ wave plate, it is reflected by the total reflection mirror at the right end of the resonator, and once again passes through the side 1/4λ±Δλ wave plate. The beam passes through the 1/4λ±Δλ wave plate twice to be converted into elliptically polarized light. Once again, it is coherently amplified by the crystal rods on this side in turn; back to the Glan prism group, the o light is output by the Glan prism group, and the e light is transmitted through the Glan prism group, and then by the left side of the Glan prism group. The crystal rods are coherently amplified in sequence, and after passing through the 1/4λ±Δλ wave plate, they are reflected by the total reflection mirror at the left end of the cavity, and then pass through the side 1/4λ±Δλ wave plate again, and the beam passes through the 1/4λ±Δλ wave twice The sheet is converted into elliptically polarized light. In this way, the same mode and phase light beams are coherently amplified and continuously oscillated in the resonant cavity.

[0011] Two or more of the solid-state laser multi-rod symmetric series cavities can also be connected in series in the direction of the laser output axis of the output coupling mirror. For example, a solid-state laser multi-rod symmetric series cavity called a primary series cavity can output light beams from another The output coupling mirror called the secondary solid-state laser multi-rod symmetric series cavity enters the series cavity and continues to oscillate output.