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Strongly coupled intracavity frequency-doubled pulsed lasers.

David J Binks¹

¹Laser Photonics Group, Department of Physics and Astronomy, University of Manchester, Manchester, UK. db@fs4.ph.man.ac.uk

|March 10, 2004

Summary

Simple expressions accurately predict the performance of strongly coupled frequency-doubled lasers. These findings offer insights into pulsed laser dynamics and energy depletion in nonlinear systems.

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Area of Science:

Laser physics
Nonlinear optics
Quantum optics

Background:

Intracavity frequency-doubled lasers are crucial for generating visible light from infrared lasers.
Understanding the dynamics of pulsed lasers, particularly under strong nonlinear coupling, is essential for optimizing their performance.
Previous models often simplified the nonlinear coupling, limiting their accuracy for many practical systems.

Purpose of the Study:

To derive simple analytical expressions for key parameters of strongly coupled intracavity frequency-doubled lasers.
To validate these expressions against numerical simulations of laser rate equations.
To elucidate the unique population inversion dynamics in pulsed lasers with strong nonlinear coupling.

Main Methods:

Derivation of analytical expressions for peak power, pulse energy, and pulse length.
Numerical integration of the rate equations governing laser dynamics.
Comparison of analytical results with numerical data for various nonlinear coupling strengths.

Main Results:

The derived simple expressions show good agreement with numerical integration results for common nonlinear coupling values.
Strong nonlinear coupling leads to a distinct depletion of population inversion, stopping at the threshold level.
This behavior contrasts with the deeper depletion observed in systems with weak nonlinear or linear coupling.

Conclusions:

The presented simple expressions provide a valuable tool for the design and analysis of strongly coupled intracavity frequency-doubled lasers.
The findings highlight the significant impact of strong nonlinear coupling on laser performance and energy dynamics.
This work contributes to a better theoretical understanding of pulsed laser operation in nonlinear optical systems.

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