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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
Published on: July 12, 2017
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Intracavity frequency-doubled degenerate laser
Optics Letters
|February 2, 2017
Summary
We created a green laser light source with low spatial coherence for improved imaging. This novel solid-state laser reduces speckle and removes artifacts in fluorescence imaging, benefiting parallel imaging and displays.
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.
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