Linewidth and tuning characteristics of terahertz quantum cascade lasers
- 15 March 2004
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 29 (6) , 575-577
- https://doi.org/10.1364/ol.29.000575
Abstract
We have measured the spectral linewidths of three continuous-wave quantum cascade lasers operating at terahertz frequencies by heterodyning the free-running quantum cascade laser with two far-infrared gas lasers. Beat notes are detected with a GaAs diode mixer and a microwave spectrum analyzer, permitting very precise frequency measurements and giving instantaneous linewidths of less than . Characteristics are also reported for frequency tuning as the injection current is varied.
Keywords
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