Ring shaped resonance cavity laser

Abstract

The invention discloses a ring-shaped resonant cavity laser, which comprises a back cavity mirror and a laser gain medium with magneto-optical rotation effect. The back cavity and the laser gain medium with magneto-optical rotation effect constitute a ring-shaped light path. The laser gain medium with magneto-optical rotation effect is arranged in a magnetic field H, which is provided with an incoming head face, an outgoing head face and three reflecting surfaces. A light path block material is arranged in the middle of the incoming head face and the outgoing head face; the reflecting surface which remotely faces to the back cavity mirror is coated with a high reflecting film; a polarizing polarizer and a wave plate are arranged in the ring-shaped light path; when the wave plate is arranged on the laser outgoing light path of the laser gain medium with magneto-optical rotation effect, the wave plate is a one half plate; when the wave plate is arranged on the laser incoming and outgoing light paths of the laser gain medium with magneto-optical rotation effect, the wave plate is a one fourth plate. By using the coactions of the magneto-optical rotation effect, the wave plate and the polarized polarizer, polarization loss of the light transmitted along a single direction is carried out in the ring-shaped light path, thus realizing the single direction ring-shaped polarization.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a ring resonator laser. Background technique [0002] A ring resonator laser is a traveling wave cavity laser that can achieve high laser stability and single longitudinal mode output. The traditional ring resonator needs to form a ring resonator through three or more reflective surfaces, and its optical path adjustment is relatively complicated. How to reduce the adjustable reflective surface is one of the efforts of laser designers. U.S. Patent No. US5052815 proposes a two-cavity mirror ring resonator, such as figure 1 As shown, the ring resonant cavity includes front and rear cavity mirrors 11, 12, Nd:YAG crystal prism 2′, Brewster special plate 41, nonlinear optical frequency doubling crystal 6, pumping light is incident from the front cavity mirror 11, and resonant light is emitted. After being refracted by the Nd:YAG crystal prism 2 and reflected by the rear cavity mirror 12, and t...

AI Technical Summary

Problems solved by technology

The optical structure has only two reflective cavity mirrors, which greatly simplifies the laser adjustment system. However, this structure has relatively high requirements on the accuracy of the laser incident surface 25 and the laser exit surface 26 of the Nd:YAG crystal prism 2, so the installation accuracy is also very high. , cannot be mass-produced, and its manufacturing cost is relatively high

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