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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

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Cascaded Raman microlaser in air and buffer.

Maria V Chistiakova¹, Andrea M Armani

¹Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, 3651 Watt Way, Los Angeles, California 90089, USA.

|October 3, 2012

Summary

This summary is machine-generated.

Researchers developed a cascaded Raman microlaser using a silica microsphere. This low-threshold laser operates in air and buffer, demonstrating its potential for complex environments.

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Area of Science:

Photonics and optical engineering
Nonlinear optics
Laser technology

Background:

Optical microcavities enhance light-matter interactions due to long photon lifetimes.
High circulating optical intensities in microcavities enable low-threshold microlaser operation.
Microlasers are suitable for operation in diverse and complex environments.

Purpose of the Study:

To demonstrate a cascaded Raman microlaser using a silica microsphere.
To investigate microlaser performance in different environments (air and buffer).
To analyze the impact of the environment on the lasing threshold.

Main Methods:

Fabrication of a silica microsphere as an optical microcavity.
Utilizing nonlinear Raman scattering effects within the microsphere.
Characterizing the microlaser emission spectrum and threshold in air and buffer.

Main Results:

A cascaded Raman microlaser was successfully demonstrated using a silica microsphere.
The microlaser exhibited its first emission peak around 800 nm in both air and buffer.
The lasing threshold was significantly lower in air compared to the buffer environment.

Conclusions:

Silica microsphere microcavities are effective platforms for low-threshold cascaded Raman microlasers.
The environmental conditions significantly influence the lasing threshold of microlasers.
These findings highlight the potential of microlasers for applications in complex settings.