Intracavity frequency-doubled degenerate laser.
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 exhibits 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 make the green degenerate laser an attractive illumination source for parallel imaging and projection display.
Seng Fatt
SF
Liew
Sebastian
S
Knitter
Sascha
S
Weiler
Jesus Fernando
JF
Monjardin-Lopez
Mark
M
Ramme
Brandon
B
Redding
Michael A
MA
Choma
Hui
H
Cao