Distributed-feedback lasers with active framing medium
Abstract
This study describes the use of transverse waveguide pumping in thin-film layers employing an active framing medium. With this approach, active particles are excited only in the thin framing layer of the waveguide, which reduces the superluminescence and lasing (non-waveguide) that occurs within the pumped layer. A laser consisting of a 0.06 micron Ta205 film applied to a glass substrate is described. The method by which the active stripline waveguides were prepared is described. The relationship between the laser gain and the waveguide parameters is investigated theoretically, and the laser parameters corresponding to the smallest threshold pumping power are found. The use of alkali-halide crystals with color centers to obtain CW lasing is discussed. The distributed feedback lasers examined require high pumping power density and give off substantial heat in the CW mode.
- Publication:
-
USSR Rept Phys Math JPRS UPM
- Pub Date:
- August 1985
- Bibcode:
- 1985RpPhM.......47R
- Keywords:
-
- Alkali Halides;
- Continuous Wave Lasers;
- Crystals;
- Distributed Feedback Lasers;
- Excitation;
- Laser Pumping;
- Lasing;
- Luminescence;
- Particle Emission;
- Tantalum Oxides;
- Thin Films;
- Transverse Waves;
- Waveguides;
- Glass;
- Laser Outputs;
- Substrates;
- Lasers and Masers