Spectral tuning of lasing emission from optofluidic droplet microlasers using optical stretching

0397688 - ÚPT 2014 RIV US eng J - Journal Article
Aas, M. - Jonáš, A. - Kiraz, A. - Ježek, Jan - Brzobohatý, Oto - Pilát, Zdeněk - Zemánek, Pavel
Spectral tuning of lasing emission from optofluidic droplet microlasers using optical stretching.
Optics Express. Roč. 21, č. 18 (2013), s. 21380-21394. ISSN 1094-4087
R&D Projects: GA ČR GPP205/11/P294; GA MŠMT ED0017/01/01; GA TA ČR TA03010642
Institutional support: RVO:68081731
Keywords : Microcavities * Dye lasers * Optical tweezers * Optical manipulation * Fluorescence, laser-induced
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 3.525, year: 2013

We introduce tunable optofluidic microlasers based on active optical resonant cavities formed by optically stretched, dye-doped emulsion droplets confined in a dual-beam optical trap. To achieve tunable dye lasing, optically pumped droplets of oil dispersed in water are stretched by light in the dual-beam trap. Subsequently, resonant path lengths of whispering gallery modes (WGMs) propagating in the droplet are modified, leading to shifts in the microlaser emission wavelengths. Using this technique, we present all-optical, almost reversible spectral tuning of the lasing WGMs and show that the direction of tuning depends on the position of the pump beam focus on the droplet. In addition, we study the effects of temperature changes on the spectral position of lasing WGMs and demonstrate that droplet heating leads to red-tuning of the droplet lasing wavelength.
Permanent Link: http://hdl.handle.net/11104/0225316