Patent ID: 9306368
Filing Date: 2016-04-05
CPC Classification: G02F,H01S

Claim Text:
1. A laser apparatus comprising: an optical cavity defined by a pair of end mirrors, the end mirrors being substantially totally reflective; a gain medium disposed within the optical cavity; a Kerr-lens mode locking unit disposed within the optical cavity; and an electro-optical modulator configured to change a polarization state of a beam inside the optical cavity, wherein the electro-optical modulator is configured to be controlled by an electrical signal having at least two states of bias voltage, at least one of the states comprising voltage oscillations, wherein the voltage oscillations are configured to be initiated at a moment of switching between the at least two states and are determined and supported by means of a passive LC circuit configured to generate the voltage oscillations through a ringing phenomena at a frequency corresponding to a resonance frequency of the LC circuit, wherein L and C values are selected such that a period of the voltage oscillations of the LC circuit is about two times longer than a round-trip time of a light pulse inside the optical cavity, and wherein the optical cavity is configured such that radiation is extracted from the optical cavity as the radiation reflects from a polarizer.