title: Titanium-enhanced Raman microcavity laser.
abstract: Whispering gallery mode microcavities are ideally suited to form microlaser devices because the high circulating intensity within the cavity results in ultralow lasing thresholds. However, to achieve low-threshold Raman lasing in silica devices, it is necessary to have quality factors above 100 million. One approach to circumvent this restriction is to intercalate a sensitizer into the silica, which increases the Raman gain. In the present work, we demonstrate a Raman laser based on a titanium sensitized silica solgel coated toroidal microcavity. By tuning the concentration of the Ti, the Raman efficiency improves over 3× while maintaining sub-mW thresholds.
authors.forename: Nishita
authors.initials: N
authors.lastname: Deka
authors.forename: Ashley J
authors.initials: AJ
authors.lastname: Maker
authors.forename: Andrea M
authors.initials: AM
authors.lastname: Armani
mesh_terms: D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D008904:Miniaturization; D013059:Spectrum Analysis, Raman / Q000295:instrumentation*; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D014025:Titanium