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Cavity length matching and optical resonances in a Raman laser with the multimode pump source.

Ruslan V Chulkov, Vasyli Y Markevich, Ahmed Y Alyamani

|December 8, 2017

Summary

Synchronous pumping of a nanosecond Raman laser enhances output energy and lowers the generation threshold. This effect occurs when the laser cavity

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Area of Science:

Laser physics
Nonlinear optics
Quantum optics

Background:

Raman lasers are crucial for generating specific wavelengths.
Understanding laser dynamics is key to improving performance.
Multimode lasers present unique pumping challenges.

Purpose of the Study:

To investigate the effect of pump laser temporal characteristics on Raman laser performance.
To explore the phenomenon of synchronous pumping in nanosecond Raman lasers.
To identify conditions for optimizing Raman laser output energy and threshold.

Main Methods:

Experimental observation of a nanosecond Raman laser.
Varying the laser cavity's round-trip time.
Matching cavity time with a longitudinally multimode pump laser.
Analyzing output energy and generation threshold.

Main Results:

Observed a local reduction in the generation threshold.
Observed an enhancement in the output energy.
Correlation found when cavity round-trip time matched pump laser time or its ratio.
Attributed effects to synchronous pump effect due to pump pulse intensity structure periodicity.

Conclusions:

Synchronous pumping significantly improves nanosecond Raman laser efficiency.
Cavity-pump time matching is a critical parameter for optimization.
The synchronous pump effect offers a pathway to enhanced laser performance.