Integrated lasers in crystalline double tungstates with focused-ion-beam nanostructured photonic cavities
✍ Scribed by F. Ay; I. Iñurrategui; D. Geskus; S. Aravazhi; M. Pollnau
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 298 KB
- Volume
- 8
- Category
- Article
- ISSN
- 1612-2011
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✦ Synopsis
Deeply etched Bragg gratings were fabricated by focused ion beam (FIB) milling in KGdxLu1-x(WO4)2:Yb 3+ to obtain photonic cavity structures. By optimizing parameters such as dose per area, dwell time and pixel resolution the redeposition effects were minimized and grating structures more than 4 μm in depth with an improved sidewall angle of ∼ 5 • were achieved. Fabry-Perot microcavities were defined and used to assess the optical performance of the grating structures at ∼ 1530 nm. An on-chip integrated laser cavity at ∼ 980 nm was achieved by defining a FIB reflective grating and FIB polished waveguide end-facet. With this cavity, an onchip integrated waveguide laser in crystalline potassium double tungstate was demonstrated. Ti:Sapphire pump laser Beam splitter Laser emission (to detectors) FIB polished facet FIB defined grating Experimental setup for laser operation of a double tungstate waveguide with an on-chip cavity formed by FIB-milled end facet and Bragg grating