Linewidth and tuning characteristics of terahertz quantum cascade lasers |
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| Authors: | Barkan A Tittel F K Mittleman D M Dengler R Siegel P H Scalari G Ajili L Faist J Beere H E Linfield E H Davies A G Ritchie D A |
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| Affiliation: | Department of Electrical and Computer Engineering, MS-366, Rice University, Houston, Texas 77251-1892, USA. |
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| 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 -30 kHz. Characteristics are also reported for frequency tuning as the injection current is varied. |
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