
Proceedings Paper
Manipulation of electrical flicker-noise and line narrowing in free-running quantum cascade-lasersFormat | Member Price | Non-Member Price |
---|---|---|
$17.00 | $21.00 |
Paper Abstract
Intrinsic linewidths of quantum-cascade lasers are found to be extremely narrow, ~100 Hz. However, the free running
linewidths (usually ~1 MHz) of existing quantum-cascade lasers are governed by flicker frequency-noise that is
identified to originate from electrical flicker-noise in the devices. Obviously, substantial suppression of the electrical
flicker noise is required for substantial narrowing of free-running LWs. In this presentation, we show systematic
experimental results of flicker voltage-noise power-spectral density obtained with mid-infrared quantum-cascade lasers
of designed positioning of impurities in injectors. The measured noise-levels depending strongly on impurity position as
well as device-temperature are evaluated with an ad hoc model based on fluctuating charge-dipoles induced by trapping
and de-trapping at impurity states in their injectors. It is shown that quasi-delta doping of impurities leads to strong
suppression of electrical flicker noise by minimization of the dipole-length at a certain temperature, for instance ~300 K
and, in turn, is expected to narrow astonishingly the free-running line-width down below 10 kHz without assistances of
any types of feedback schemes.
Paper Details
Date Published: 8 February 2015
PDF: 9 pages
Proc. SPIE 9370, Quantum Sensing and Nanophotonic Devices XII, 93702U (8 February 2015); doi: 10.1117/12.2181338
Published in SPIE Proceedings Vol. 9370:
Quantum Sensing and Nanophotonic Devices XII
Manijeh Razeghi; Eric Tournié; Gail J. Brown, Editor(s)
PDF: 9 pages
Proc. SPIE 9370, Quantum Sensing and Nanophotonic Devices XII, 93702U (8 February 2015); doi: 10.1117/12.2181338
Show Author Affiliations
Masamichi Yamanishi, Hamamatsu Photonics K.K. (Japan)
Toru Hirohata, Hamamatsu Photonics K.K. (Japan)
Published in SPIE Proceedings Vol. 9370:
Quantum Sensing and Nanophotonic Devices XII
Manijeh Razeghi; Eric Tournié; Gail J. Brown, Editor(s)
© SPIE. Terms of Use
