  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.
