Adjustable light source with narrow line width and single transverse mode using a quasi-incoherent broadband pump source

摘要

A light source (200) is disclosed, having a quasi-incoherent broadband pump source (210) configured to produce a longitudinally and transversally multi-mode pump beam (215). The light source may include a means (220) for narrowing the linewidth of the pump beam. The light source includes an optical parametric oscillator (250) with an optical cavity (351,352) containing a crystal (370). The optical parametric oscillator is configured to receive light from the pump source and produce a first output light beam (265) and a second output light beam (266). An optical coupler (240) is disposed between the pump source and the optical parametric oscillator. At least one of the first and second output light beams is a substantially single transversal mode light having a narrower linewidth than the pump source.