Mirrorless buried waveguide laser in monoclinic double tungstates fabricated by a novel combination of ion milling and liquid phase epitaxy
Bolaños, Western, Carvajal, Joan J., Mateos-Planas, Xavier, Murugan, Ganapathy Senthil, Subramanian, Ananth Z., Wilkinson, James S., Cantelar, Eugenio, Jaque, Daniel, Lifante, Ginés, Aguiló, Magdalena and Díaz, Francisco (2010) Mirrorless buried waveguide laser in monoclinic double tungstates fabricated by a novel combination of ion milling and liquid phase epitaxy. Optics Express, 18, (26), 26937-26945. (doi:10.1364/OE.18.026937)
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Description/Abstract
Buried channel waveguides were fabricated by liquid phase epitaxial growth of a lattice-matched KY0.58Gd0.22Lu0.17Tm0.03(WO4)2 film on a microstructured KY(WO4)2 substrate. Channels were transferred to the substrates by standard photolithography and Ar-ion milling. The bottom and sidewalls of the milled channels were smooth enough (rms roughness = 70 nm and 20 nm, respectively) to favour the epitaxial growth of the active layer without defects at the boundary of substrate/epitaxial layer. The refractive index contrast was sufficient to enable light confinement and guided modes with low scattering losses were observed at wavelengths between 1440 nm and 1640 nm. CW laser operation at 1840 nm at room temperature was observed with feedback provided only by Fresnel reflection at the end faces, with slope efficiencies of 4% and 9% for TE and TM polarizations, respectively.
| Item Type: | Article |
|---|---|
| ISSN: | 1094-4087 (print) |
| Related URLs: | http://www.orc.soton.ac.uk/vie...l?pid=4957 |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | University Structure - Pre August 2011 > Optoelectronics Research Centre |
| ePrint ID: | 176669 |
| URI: | http://eprints.soton.ac.uk/id/eprint/176669 |
| Deposited On: | 10 Mar 2011 11:18 |
| Last Modified: | 02 Mar 2012 13:37 |
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