Study of Various Designs of Solid State Laser Oscillator

Abstract

-This study concerns with the laser oscillator, threshold conditions, circulating power, and the Gaussian beam profile. Laser oscillator is a crucial device, which provides the feedback necessary to make a laser work. The regenerative laser oscillator is essentially a combination of two basic components: an optical amplifier, and an optical resonator, which serves to provide highly selective feedback. The optical resonator, comprised of two opposing plane-parallel or curved mirrors at right angles to the axis of active material, performs function of the feedback element, by coupling back in phase a portion of the signal emerging from the amplifing medium. The photons are reflected back and forth for many passes through the rod (amplifying medium), stimulating more and more emission on each pass. The mirrors can be gently curved so they tend to keep the light concentration inside the rod. One of the mirrors is 100 % reflective, but the other mirror transmits part of the light hitting it. This transmitted light is the output beam from the laser