Patent ID: 7778290
Filing Date: 2010-08-17
Classification: H01S

Abstract:
1. A laser for producing infrared Band IV wavelengths, comprising: a depolarized laser oscillator for producing depolarized light in a first orthogonal state and in a second orthogonal state, wherein said depolarized laser oscillator is a laser diode and light output from said laser diode being depolarized by a depolarizer, and wherein said depolarizer comprises a first polarization beam splitter having an input fiber and two output fibers and a second polarization beam splitter having two input fibers and an output fiber, wherein said two input fibers of said second polarization beam splitter are spliced together with said two output fibers of said first polarization beam splitter so as to form a first path and a second path, wherein a difference in length between said first and second paths is longer than a coherence length of said laser diode; at least one amplifier for amplifying said depolarized light; a polarizer for separating said amplified depolarized light into a first orthogonal state and a second orthogonal state; a first frequency conversion device for converting said amplified depolarized light in said first orthogonal state; and a second frequency conversion device for converting said amplified depolarized light in said second orthogonal state.