Intracavity frequency doubling microchip laser and preparation method thereof

Abstract

The invention provides an intracavity frequency doubling microchip laser, which comprises a semiconductor pump laser, coupling lenses, a laser crystal and a frequency doubling crystal which are arranged in sequence in a light passing direction. A film which is high in reflectance to fundamental frequency light and frequency doubling light is plated on the front end face of the laser crystal to form a front cavity mirror of a laser cavity; a film which is high in reflectance to the fundamental frequency light and high in transmittance to the frequency doubling light is plated on the rear end face of the frequency doubling crystal to form a rear cavity mirror of the laser cavity; films for reducing the reflection of the fundamental frequency light are respectively plated on the rear end face of the laser crystal and the front end face of the frequency doubling crystal; two bare fibers of which the coatings are removed are respectively arranged between the laser crystal and the frequency doubling crystal and in areas at both sides outside a light-passing aperture; and two planes of the laser crystal and the frequency doubling crystal are isolated at equal intervals by the two bare fibers, and therefore, the laser crystal and the frequency doubling crystal form independent planar cavity structures. The invention also provides a preparation method for the intracavity frequency doubling microchip laser. The light outlet power also can be improved and the light spot quality also can be improved while small size is realized, and moreover, the cost is low.

Description

technical field [0001] The invention relates to an intracavity frequency doubling microchip laser. Background technique [0002] Such as figure 1 As shown, the intracavity frequency doubling microchip laser is usually composed of a semiconductor laser 1', a coupling lens 2', a laser crystal 3', and a frequency doubling crystal 4', wherein the laser crystal 3' and the frequency doubling crystal 4' are processed into high-precision The flat plate is parallel, and the front face of the laser crystal 3' is plated with a high-reflectivity thin film of the fundamental frequency light and the frequency doubled light, which is used as the front cavity mirror 5' of the laser cavity. The rear end face of the frequency doubling crystal 4' is plated with a film with high reflectivity to the fundamental frequency light and a high transmittance to the frequency doubling light, as the rear cavity mirror 6' of the laser cavity. Then, the uncoated surfaces of the laser crystal 3' and the f...

AI Technical Summary

Problems solved by technology

Although this method is easier to adjust and assemble, but due to the use of an additional plano-concave cavity mirror, on the one hand, the volume is increased, and on the other hand, the cost is also increased.

Images