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Opt Lett. 2004 Mar 15;29(6):575-7.

Linewidth and tuning characteristics of terahertz quantum cascade lasers.

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  • 1Department of Electrical and Computer Engineering, MS-366, Rice University, Houston, Texas 77251-1892, USA.


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 -30 kHz. Characteristics are also reported for frequency tuning as the injection current is varied.

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