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- Title
High brightness 735 nm tapered lasers - optimisation of the laser geometry.
- Authors
Sumpf, B.; Hülsewede, R.; Erbert, G.; Dzionk, C.; Fricke, J.; Knauer, A.; Pittroff, W.; Ressel, P.; Sebastian, J.; Tränkle, G.
- Abstract
High brightness tapered laser diodes with different resonator geometries were fabricated and analysed. The devices consist of an index-guided straight section and a gain-guided tapered section. Lasers with a total lengthL= 2 and 4 mm and different length of the ridge waveguideLRW (500 µm =LRW = 1250 µm forL= 2 mm and 500 µm =LRW = 2000 µm forL= 4 mm) were processed to study the influence of the straight section on the spatial mode filtering. The power-voltage-current-characteristics, the beam waist, the far field, and the beam propagation factorM2 were measured. From the experiments, it can be stated that the lasers with a smallLRW reach higher output powers compared to those with largerLRW. Concerning the beam quality the lengthLRW should exceed a minimal value to guarantee efficient spatial mode filtering. Devices optimised concerning maximum output power and excellent beam quality reach a beam propagation factor smaller than 2.1 at an output powerP= 2 W.
- Subjects
LASERS; BRIGHTNESS temperature; DIODES; GAS tubes; FABRIC filters; OPTOELECTRONIC devices
- Publication
Optical & Quantum Electronics, 2003, Vol 35, Issue 4/5, p521
- ISSN
0306-8919
- Publication type
Article
- DOI
10.1023/A:1022977923922