Picosecond Spectral Dynamics of Gain-Switched DFB Lasers
| Autor: | K. Lauritsen, G. Erbert, S. Schwertfeger, Katrin Paschke, R. Erdmann, Hans Wenzel, S M Riecke |
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| Rok vydání: | 2011 |
| Předmět: |
Distributed feedback laser
Materials science business.industry Physics::Optics Grating Condensed Matter Physics Laser Atomic and Molecular Physics and Optics law.invention Semiconductor laser theory Optical pumping Wavelength Optics law Picosecond Optoelectronics Electrical and Electronic Engineering business Diode |
| Zdroj: | IEEE Journal of Quantum Electronics. 47:715-722 |
| ISSN: | 1558-1713 0018-9197 |
| Popis: | We study the generation of picosecond pulses by gain-switching of distributed feedback ridge-waveguide laser diodes. By pumping with short current pulses without d.c. bias, we obtain laser pulses with peak powers above 1 W at a wavelength around 1065 nm. These pulses exhibit strong spectral dynamics stemming from mode competition after switch-on. Typically, emission begins with a broad spectrum, before narrowing down to the Bragg line within a few hundred picoseconds. This dynamic behavior is studied in detail both experimentally and numerically for a variety of grating parameters. Using a rate-equation model with two species of photons, we achieve excellent agreement between simulation and experiment. In conclusion, we discuss the optimization of DFB laser diodes for short pulse generation. |
| Databáze: | OpenAIRE |
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