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• W2285436242 abstract "Fused silica microspheres and on-chip silica microtoroids support ultra-high quality factor and small volume whispering-gallery-modes (WGMs). They have attracted great interest for several decades and have had various applications like cavity-QED, microlasers, and biosensing. This thesis focuses on the realization of ultra-low threshold microlaser based on Nd3+:Gd2O3 nanocrystals (NCs), which are embedded close to the cavity surface. In particular, we demonstrate a novel method for the mapping of the electromagnetic-field distribution of WGMs using the fiber taper coupler used for evanescent-wave coupling. This provides an efficient way to locate and selectively excite the small volume modes. Moreover, we demonstrate a real time measurement technique of the laser characteristic, which uses thermal bistability of such microcavities, and enables quick and efficient optimization of the taper-cavity coupling conditions. Finally, single mode lasing at 1088 nm is achieved from a 40 µm diameter microsphere with Nd3+:Gd2O3 NCs, optically pumped at 802 nm, with a threshold of 65 nW. The lowest measured threshold is 40 nW, which is believed to be the lowest threshold record for any rare earth lasers. The Q factor of these active cavities at emission wavelength is as high as 10^8, favourable for ultra narrow linewidth spectrum. In addition, for an on-chip silica microtoroid made from Nd ion-implanted silica, we have achieved single-mode lasing at 909nm and a threshold of 210 nW." @default.
• W2285436242 created "2016-06-24" @default.
• W2285436242 creator A5055236621 @default.
• W2285436242 date "2010-09-08" @default.
• W2285436242 modified "2023-09-27" @default.
• W2285436242 title "Fabrication and characterization of optical microcavities functionalized by rare-earth oxide nanocrystals : realization of a single-mode ultra low threshold laser" @default.
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• W2285436242 hasPublicationYear "2010" @default.
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