TITLE

Ultrafast absorption recovery dynamics of 1300 nm quantum dot saturable absorber mirrors

AUTHOR(S)
Lumb, M. P.; Clarke, E.; Harbord, E.; Spencer, P.; Murray, R.; Masia, F.; Borri, P.; Langbein, W.; Leburn, C. G.; Jappy, C.; Metzger, N. K.; Brown, C. T. A.; Sibbett, W.
PUB. DATE
July 2009
SOURCE
Applied Physics Letters;7/27/2009, Vol. 95 Issue 4, p041101
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We compare the performance of two quantum dot saturable absorber mirrors with one device operating at the quantum dot ground state transition whereas the other operates at the first excited state transition. Time-resolved photoluminescence and heterodyne four-wave mixing experiments demonstrate faster recovery of the excited-state device compared to the ground-state device. Femtosecond pulses were achieved with both devices, with the ground-state device producing 91 fs pulses and the excited-state device producing 86 fs pulses in a Cr:forsterite laser. The fast absorption recovery dynamics indicates the potential of devices exploiting excited-state transitions for use in high repetition rate lasers.
ACCESSION #
43494236

 

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