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Titanium-enhanced Raman microcavity laser.

Nishita Deka, Ashley J Maker, Andrea M Armani

|April 3, 2014

Summary

This study demonstrates a novel titanium-sensitized silica microcavity for low-threshold Raman lasers. Optimizing titanium concentration significantly boosts Raman efficiency while maintaining ultra-low lasing thresholds.

Area of Science:

Photonics and Optical Engineering
Materials Science
Laser Physics

Background:

Whispering gallery mode microcavities offer high circulating intensity for ultralow lasing thresholds in microlasers.
Achieving low-threshold Raman lasing in silica requires quality factors exceeding 100 million.
Sensitizer intercalation into silica can enhance Raman gain, circumventing high-quality factor requirements.

Purpose of the Study:

To demonstrate a Raman laser utilizing a titanium-sensitized silica solgel coated toroidal microcavity.
To investigate the effect of titanium concentration on Raman efficiency and lasing thresholds.
To achieve low-threshold Raman lasing in silica-based devices through sensitization.

Main Methods:

Fabrication of a toroidal microcavity using a silica solgel coating.

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Intercalation of titanium (Ti) as a Raman gain sensitizer into the silica matrix.

Characterization of Raman efficiency and lasing thresholds as a function of titanium concentration.

Main Results:

Demonstrated a Raman laser based on a titanium-sensitized silica toroidal microcavity.
Observed a Raman efficiency improvement exceeding 3× by tuning titanium concentration.
Maintained sub-milliwatt (sub-mW) lasing thresholds.

Conclusions:

Titanium sensitization is an effective strategy to enhance Raman gain in silica microcavities.
The developed titanium-sensitized silica microcavity enables low-threshold Raman lasing.
This approach offers a viable pathway for developing efficient and compact Raman microlasers.