Series in Quantum Electronics
Henry Baltes, Peter Günter, Ursula Keller,
Fritz K. Kneubühl †, Walter Lukosz,
Hans Melchior, Markus W. Sigrist
Passively Modelocked Electrically
1st edition 2013. XXVI, 148 pages, € 64,00.
Optically pumped vertical external-cavity surface-emitting lasers (OP-VECSELs) have shown impressive performance with high average output power in both continuous-wave (cw) and passively modelocked operation using semiconductor saturable absorber mirrors (SESAMs). Electrical pumping (EP) is a key factor for more compact and cost efficient modelocked VECSELs suitable for low-cost mass applications such as optical clock-rate distribution in microprocessors, chip-to-chip interconnects or optical telecommunication systems.
This thesis describes the design, fabrication and performance improvement of an EP-VECSEL optimized for passive modelocking. An initial realization of an EP-VECSEL is presented, which demonstrated confined Gaussian-like current injection profiles and up to 120 mW of output power in cw multi-mode operation. A detailed investigation of the beam quality of EP-VECSELs is discussed and reveals important guidelines for achieving excellent beam quality with reasonable output power levels. Furthermore, an in-depth characterization of important gain properties is given and broadens the physical understanding of these devices. Moreover, an optimized EP-VECSEL is presented, which enabled up to 170 mW of output power in cw multi-mode operation and 26 mW in fundamental transversal mode operation. This was made possible by improving various design aspects of the devices. Passively modelocking the optimized EP-VECSELs with a SESAM led to 7.3-ps pulses with 13.1 mW of average output power at 1.46 GHz repetition rate. Furthermore, a record-low pulse duration of 6.3 ps was obtained, the shortest pulses from a passively modelocked EP-VECSEL so far.
About the author:
Wolfgang P. Pallmann received his diploma in electrical engineering in 2009 from the Friedrich-Alexander-University in Erlangen, Germany. He joined the Ultrafast Laser Physics group in the Institute of Quantum Electronics at ETH Zurich in the same year. His current research interests focus on the development and optimization of ultrafast semiconductor lasers, especially electrically pumped vertical external-cavity surface-emitting lasers.
Keywords: ultrafast semiconductor lasers, passively modelocked VECSELs, electrically pumped VECSELs
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