Intracavity frequency-doubled degenerate laser
Seng Fatt Liew, Sebastian Knitter, Sascha Weiler, Jesus Fernando, Monjardin-Lopez, Mark Ramme, Brandon Redding, Michael A. Choma, and Hui Cao
TL;DR
This paper presents a low-coherence green laser source via intracavity frequency doubling of a degenerate laser, reducing speckle and artifacts for improved imaging and display applications.
Contribution
It introduces a novel green laser with high power, low spatial coherence, and good directionality using intracavity frequency doubling in a degenerate laser.
Findings
Supports many transverse modes in second harmonic emission
Demonstrates strong speckle suppression
Removes coherent artifacts from fluorescence images
Abstract
We develop a green light source with low spatial coherence via intracavity frequency doubling of a solid-state degenerate laser. The second harmonic emission supports many more transverse modes than the fundamental emission, and exhibit lower spatial coherence. A strong suppression of speckle formation is demonstrated for both fundamental and second harmonic beams. Using the green emission for fluorescence excitation, we show the coherent artifacts are removed from the full-field fluorescence images. The high power, low spatial coherence and good directionality makes the green degenerate laser an attractive illumination source for parallel imaging and projection display.
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