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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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Published on: July 12, 2017

High-power wavelength converters with feedback.

E A Stappaerts, H Komine

|October 22, 2009

Summary

High-peak-power wavelength converters achieve high conversion efficiencies with minimal feedback. Radially varying reflectivity profiles maximize performance, demonstrated by 70% second-harmonic generation and 56% optical parametric oscillation.

Area of Science:

Nonlinear optics
Laser physics
Materials science

Background:

High-peak-power lasers require efficient wavelength conversion for various applications.
Traditional wavelength converters often face limitations in efficiency and stability.
Optimizing feedback mechanisms is crucial for enhancing conversion processes.

Purpose of the Study:

To investigate the theoretical and experimental feasibility of achieving high conversion efficiencies in high-peak-power wavelength converters using small amounts of feedback.
To explore the impact of radially varying reflectivity profiles on conversion efficiency.
To demonstrate the practical application of this concept in second-harmonic generation and optical parametric oscillation.

Main Methods:

Theoretical modeling of wavelength conversion processes with feedback.

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Experimental implementation using deuterated potassium dihydrogen phosphate (DKDP) crystals for second-harmonic generation.

Experimental implementation using beta-barium borate (BBO) crystals for optical parametric oscillation.

Comparison of experimental results with simulation data.

Main Results:

Achieved very high conversion efficiencies in high-peak-power wavelength converters with minimal feedback.
Demonstrated that maximum efficiencies are obtained with radially varying reflectivity profiles.
Experimentally obtained 70% energy conversion efficiency in DKDP for second-harmonic generation.
Obtained 56% energy conversion efficiency in BBO for optical parametric oscillation, consistent with simulations.

Conclusions:

Small amounts of feedback can significantly enhance conversion efficiencies in high-peak-power wavelength converters.
Radially varying reflectivity profiles are key to maximizing performance.
The demonstrated methods are effective and validated by experimental results in nonlinear optical crystals.