DocumentCode :
2151507
Title :
Microscopic Nonequilibrium Simulations in Semiconductor Laser Structures
Author :
Kühn, E. ; Thränhardt, A. ; Chatterjee, S. ; Lange, C. ; Horst, S. ; Hantke, K. ; Stolz, W. ; Rühle, W. ; Koch, S.W. ; Diehl, W. ; Brick, P.
Author_Institution :
Philipps-Univ. Marburg, Marburg
fYear :
2007
fDate :
17-22 June 2007
Firstpage :
1
Lastpage :
1
Abstract :
In recent years, vertical cavity surface emitting lasers (VCSEL) have developed into an important semiconductor laser source in multiple applications. However, the limited output power of VCSEL systems restrains industrial applications. The vertical external cavity surface emitting laser (VECSEL) design overcomes this limitation by replacing the upper distributed bragg reflector by an external parabolic mirror. Nevertheless, heating of the active region and related phenomena as e.g. the thermal rollover arise and turn out to be the major problem for further enhancement of VECSEL output power (Zakharian et al., 2003). Those phenomena contain new challenges for the theoretical description. With our model, we have the unique possibility to simulate optical and thermal properties of VECSEL devices. An example shows the laser output spectrum of a VECSEL device experimentally measured with a streak camera setup. The VECSEL is pumped with a strong 500ns pump pulse. One clearly sees the thermal shift of the band gap corresponding to a lattice heating of 4.2K/mus. In comparison, our simulation shows a good agreement with a slope of the thermal heating of 3.6K/ mus for the same structure. Additionally, thermal resistance dependent rollover curves were calculated for the same structure and exhibit the expected behaviour. In the future we expect our simulations to aid in the design and manufacturing process of semiconductor lasers. On the more fundamental level, we are interested in the dynamics of the optical properties in connection to nonequilibrium carrier populations as present e.g. in chirped excitation.
Keywords :
laser theory; lattice energy; optical properties; surface emitting lasers; thermal properties; thermal resistance; VCSEL; lattice heating; microscopic nonequilibrium simulations; optical properteis; semiconductor laser structures; streak camera setup; thermal band gap shift; thermal heating; thermal properties; thermal resistance; vertical cavity surface emitting lasers; Distributed Bragg reflectors; Heating; Microscopy; Optical design; Optical pumping; Power generation; Semiconductor lasers; Surface emitting lasers; Thermal resistance; Vertical cavity surface emitting lasers;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Lasers and Electro-Optics, 2007 and the International Quantum Electronics Conference. CLEOE-IQEC 2007. European Conference on
Conference_Location :
Munich
Print_ISBN :
978-1-4244-0931-0
Electronic_ISBN :
978-1-4244-0931-0
Type :
conf
DOI :
10.1109/CLEOE-IQEC.2007.4386017
Filename :
4386017
Link To Document :
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