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Energy limits imposed by two-photon absorption for pulse amplification in high-power
 

Summary: Energy limits imposed by two-photon absorption
for pulse amplification in high-power
semiconductor optical amplifiers
Faisal R. Ahmad, Yen Wei Tseng, Mikhail A. Kats, and Farhan Rana*
School of Electrical and Computer Engineering, Cornell University, Ithaca, New York 14850, USA
*Corresponding author: fr37@cornell.edu
Received January 23, 2008; accepted March 25, 2008;
posted April 7, 2008 (Doc. ID 92017); published May 7, 2008
We study the combined effects of dynamic gain saturation and two-photon absorption on the amplification of
short pulses in semiconductor optical amplifiers and show that two-photon absorption can saturate the am-
plifier gain and limit the output pulse energies even for amplifiers with large gain saturation energies. We
discuss the upper limits for the pulse energies obtainable from semiconductor optical amplifiers in the pres-
ence of two-photon absorption and show that for single transverse mode waveguide amplifiers these upper
limits can range from values as small as a few picojoules to several hundred picojoules for pulse widths in
the 0.5 ps to 20 ps range, respectively. 2008 Optical Society of America
OCIS codes: 250.5980, 320.7110, 250.5530.
There has been a growing interest in obtaining high-
energy short pulses from semiconductor optical am-
plifiers (SOAs) and from semiconductor mode-locked
lasers [14]. Schemes employed to generate high-

  

Source: Afshari, Ehsan - School of Electrical and Computer Engineering, Cornell University

 

Collections: Engineering