Abstract
We demonstrate single-mode quantum cascade lasers employing a folded Fabry-Perot cavity consisting of two straight sections connected by a semicircular section in a "hairpin" shape. These folded cavity lasers emitting at ∼4.5 μm are fabricated with identical processes as those for plain Fabry-Perot ridge lasers, and show a strong suppression of the comb of Fabry-Perot cavity modes, leading to tunable single-mode emission with up to 27 dB side mode suppression ratio and a single-mode operating current range of up to 60% above the threshold current when operated in pulsed mode; single-mode emission is achieved from 80 to ∼240 K.
Original language | English (US) |
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Article number | 061110 |
Journal | Applied Physics Letters |
Volume | 98 |
Issue number | 6 |
DOIs | |
State | Published - Feb 7 2011 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)