Liew Seng Fatt, Knitter Sebastian, Weiler Sascha, Monjardin-Lopez Jesus Fernando, Ramme Mark, Redding Brandon, Choma Michael A, Cao Hui
Opt Lett. 2017 Feb 1;42(3):411-414. doi: 10.1364/OL.42.000411.
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.
我们通过固态简并激光器的腔内倍频开发了一种具有低空间相干性的绿色光源。二次谐波发射比基波发射支持更多的横向模式，并且表现出更低的空间相干性。对于基波光束和二次谐波光束，都证明了对散斑形成有强烈的抑制作用。利用绿色发射进行荧光激发，我们展示了全场荧光图像中的相干伪影被消除。高功率、低空间相干性和良好的方向性使绿色简并激光器成为用于并行成像和投影显示的有吸引力的照明源。
