Laser source for laser machining includes frequency converter crystal and Q-factor modulator within optical cavity

摘要

The structure includes a frequency converter within the optical cavity and provides a stable operation for precision use. The laser device comprises a stable resonator includes a solid state active laser medium (2), and an element (8) which provides modulation of the Q-factor. A rectangular crystal (4) is provided for wavelength conversion, and mirrors (1,7) define the limits of the resonant cavity. The laser medium (2), modulator (8) and crystal (4) are aligned along an optical axis (5) within the resonator. The second mirror of the resonator (7) is convex. A mirror (3) is included within the optical path, and this is used to extract a specific harmonic of the laser light which comes from the second mirror (7).