DISPOSITIF DE STABILISATION DE LONGUEUR D'ONDE D'UNE SOURCE LASER A SEMI-CONDUCTEUR

摘要

The semiconductor laser wavelength stabilising system includes an optical fibre (2) taking radiation from the laser (1) to a point near to the focus of a concave spherical or parabolic mirror. Light from the optical fibre then travels to the mirror (5) and is reflected back on to a plane diffraction grating (4) lying in a plane surrounding the end of the fibre. The diffraction grating returns light to the mirror so that it is again reflected, falling on the end (9) of a second optical fibre (8) which then carries the radiation as the stabilised output. The mirror and grating serve to select the required wavelength from the range of wavelengths present in the original laser beam.