Passively mode-locked pulsed fiber laser

摘要

The device is proposed which provides mode-locked operation of a fiber laser. The principle of its operation is based on a focusing effect of Kerr lens. At high intensities of the light beam the Kerr element exhibits light focusing properties. The beam focused by the Kerr element enters a fiber core without losses thus providing an effective generation of mode-locked laser. In the preferred embodiment the Kerr element is positioned at one degree relative to a perpendicular to the beam direction.

主权项

1. A passively mode-locked pulsed fiber laser, comprising:
a fiber laser having a resonator and a gain fiber placed inside the resonator; an non-linear optical element with a Kerr non-linearity, the non-linear optical element placed inside the resonator; a light beam generated in the fiber passes the non-linear optical element; an element focuses light due to Kerr effect, and at high beam intensities above a threshold of a focus of the beam coincides with a fiber core at a first end of the fiber thus facilitating the beam entering the fiber and reducing optical losses; an optical core cross section performing a spatial filtering of the beam; further comprising a means to introduce a beam intensity fluctuation leading to modes synchronization and modelocking effect; the modelocking effect being achieved due to the reduction of optical losses at an entrance of the beam into the fiber core at the first end of the fiber when the intensity of the beam increases.