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Area of Science:

Optics and Photonics
Laser Physics
Materials Science

Background:

Solid-state lasers are crucial for various applications.
Intracavity frequency doubling is a technique to generate shorter wavelengths.
Spatial coherence affects image quality, particularly speckle formation.

Purpose of the Study:

To develop a green light source with low spatial coherence.
To investigate the properties of second-harmonic emission from a degenerate laser.
To demonstrate the suppression of speckle and removal of coherent artifacts in fluorescence imaging.

Main Methods:

Intracavity frequency doubling of a solid-state degenerate laser.
Characterization of spatial coherence for fundamental and second-harmonic beams.
Application of the green emission for fluorescence excitation and imaging.

Main Results:

A green light source with low spatial coherence was successfully developed.
Second-harmonic emission exhibited significantly lower spatial coherence than the fundamental.
Strong suppression of speckle was achieved for both beams.
Coherent artifacts were removed from full-field fluorescence images using the green emission.

Conclusions:

The developed green degenerate laser offers high power, low spatial coherence, and good directionality.
This laser is a promising illumination source for parallel imaging techniques.
The technology is suitable for applications in projection display systems.