FIBER LASER HAVING EXCELLENT REFLECTED LIGHT RESISTANCE

摘要

Provided is a fiber laser of the MO-PA method including a pulse oscillator and a first optical fiber amplifier using a rare earth-added optical fiber connected to a latter stage of the pulse oscillator. The fiber laser further includes: a wavelength conversion unit arranged between the pulse oscillator and the optical fiber amplifier; and a wavelength filter which is arranged between the wavelength conversion unit and the pulse oscillator and transmits only the wavelength component of the pulse light emitted from the pulse oscillator. Thus, it is possible to prevent breakage of the fiber laser by the reflected light without using an expensive optical part.