Optical recording system using a gas laser capable of oscillating in a single longitudinal mode

摘要

An optical recording system has a gas laser having an optical resonator for emitting a laser beam, and an optical modulator for modulating the laser beam in accordance with a signal to be recorded. An optical system is provided for focusing the modulated laser beam on the recording medium so as to record the signal. The optical resonator has an etalon and a wavelength selecting prism for selecting a single wavelength so that the gas laser oscillates the laser beam in a single longitudinal mode.