72 research outputs found
Parametric, Optimization-Based Study on the Feasibility of a Multisegment Antisolvent Crystallizer for in Situ Fines Removal and Matching of Target Size Distribution
Peer reviewedPostprin
Integrated Al<sub>2</sub>O<sub>3</sub>:Er<sup>3+</sup> microring and distributed feedback lasers on silicon
Focused ion beam nano-structuring of photonic Bragg gratings in Al<sub>2</sub>O<sub>3</sub> waveguides
Integrated amplifiers and lasers in Al<sub>2</sub>O<sub>3</sub>:Er<sup>3+</sup> thin films on a silicon chip
On-chip integrated amplifiers and lasers utilizing rare-earth-ion activation
This contribution reviews our recent results on rare-earth-ion-doped integrated amplifiers and lasers. We have concentrated our efforts on complex-doped polymers, amorphous Al2O3, and crystalline potassium double tungstates
Rare-earth-ion-doped lasers integrated on a silicon chip
Future integrated photonic circuits will utilize hybrid integration of optical materials with different functionalities, among them optical gain. We have developed two rare-earth-ion-activated materials which can be directly deposited on any passive material platform, among others on silicon wafers. In a Nd-complex-doped fluorinated polymer, we demonstrated the first-ever continuous-wave solid polymer laser, operating at 1062 nm and 878 nm. In amorphous Al2O3, we demonstrated an Er-doped, widely wavelength-selective microring laser that operates across the telecom C-band. Employing Bragg gratings lithographically inscribed into channel waveguides, we obtained cavities with a Q-factor of >10e6. With such grating reflectors, we achieved a free-running 1542-nm distributed-feedback laser with an ultra-narrow linewidth of 1.7 kHz, equaling a coherence length of 55 km and a Q-factor of 1.14x10e11. With a distributed-Bragg-grating cavity, we obtained an Yb-doped laser at 1021 nm with 47 mW output power and 67% slope efficiency, which may enable linewidths below 100 Hz
Focused ion beam nano-structuring of Al<sub>2</sub>O<sub>3</sub> dielectric layers for photonic applications
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