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HL: Halbleiterphysik

HL 9: Poster I

HL 9.68: Poster

Montag, 27. März 2006, 15:15–17:45, P3

Optimized ultrafast optical pumping of a vertical-cavity surface-emitting laser — •Christoph Lange¹, Wendel Wohlleben^2,3, Sangam Chatterjee¹, Wolfgang Stolz¹, Marcus Motzkus², and Wolfgang Rühle¹ — ¹Faculty of Physics and Material Sciences Center, Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany — ²Faculty of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Strasse, D-35032 Marburg, Germany — ³Present Address: Polymer Physics Research, BASF AG, D-67056 Ludwigshafen, Germany

The emission characteristics of an optically pumped vertical-cavity surface-emitting laser (VCSEL)[1] are optimized by specifically shaping the pump pulse. The temporal variation of amplitude and phase of the excitation are adapted using a genetic algorithm in a learning-loop [2]. Both, the excitation and emission pulses, are live monitored using a spectrometer-streak camera system. The performance of the VCSEL with respect to its emission intensity, pulse width, decay time, or delay after excitation is thus strongly improved.

[1] C. Ellmers et al., Appl. Phys. Lett. 74, 1367 (1999).

[2] H. Rabitz et al., Science 288, 824 (2000).