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01739 am a22003133u 4500 |
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86350 |
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|a dc
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|a Ren, Y.
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|a Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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|a Kao, Tsung-Yu
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|a Hu, Qing
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|a Hovenier, J. N.
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|a Cui, M.
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|a Hayton, D. J.
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|a Gao, J. R.
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|a Klapwijk, T. M.
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|a Shi, S. C.
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|a Reno, J. L.
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|a Kao, Tsung-Yu
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|a Hu, Qing
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|a Frequency locking of single-mode 3.5-THz quantum cascade lasers using a gas cell
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|b American Institute of Physics (AIP),
|c 2014-05-01T19:56:11Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/86350
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|a We report frequency locking of two 3.5-THz third-order distributed feedback (DFB)quantum cascade lasers(QCLs) by using methanol molecular absorption lines, a proportional-integral-derivative controller, and a NbN bolometer. We show that the free-running linewidths of the QCLs are dependent on the electrical and temperature tuning coefficients. For both lasers, the frequency locking induces a similar linewidth reduction factor, whereby the narrowest locked linewidth is below 18 kHz with a Gaussian-like shape. The linewidth reduction factor and the ultimate linewidth correspond to the measured frequency noise power spectral density.
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|a United States. National Aeronautics and Space Administration
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|a National Science Foundation (U.S.)
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|a en_US
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|a Article
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|t Applied Physics Letters
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