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Applied Physics Letters / Volume 99 / Issue 13 / LASERS, OPTICS, AND OPTOELECTRONICS

Appl. Phys. Lett. 99, 131106 (2011); http://dx.doi.org/10.1063/1.3645016 (3 pages)

Room temperature single-mode terahertz sources based on intracavity difference-frequency generation in quantum cascade lasers

Q. Y. Lu, N. Bandyopadhyay, S. Slivken, Y. Bai, and M. Razeghi

Center for Quantum Devices, Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, Illinois 60208, USA

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(Received 1 September 2011; accepted 9 September 2011; published online 27 September 2011)

We demonstrate room temperature single-mode THz emission at 4 THz based on intracavity difference-frequency generation from mid-infrared dual-wavelength quantum cascade lasers. An integrated dual-period distributed feedback grating is defined on the cap layer to purify both mid-infrared pumping wavelengths and in turn the THz spectra. Single mode operation of the pumping wavelengths results in a single-mode THz operation with a narrow linewidth of 6.6 GHz. A maximum THz power of 8.5 μW with a power conversion efficiency of 10 μW/W2 is obtained at room temperature.

© 2011 American Institute of Physics

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KEYWORDS and PACS

Keywords

distributed feedback lasers, laser beams, laser cavity resonators, laser feedback, laser modes, optical frequency conversion, optical pumping, quantum cascade lasers, terahertz wave devices, terahertz wave generation

PACS

  • 42.55.Px

    Semiconductor lasers; laser diodes

  • 42.60.By

    Design of specific laser systems

  • 42.65.Ky

    Frequency conversion; harmonic generation, including higher-order harmonic generation

  • 42.79.Nv

    Optical frequency converters

  • 42.60.Da

    Resonators, cavities, amplifiers, arrays, and rings

  • 42.60.Jf

    Beam characteristics: profile, intensity, and power; spatial pattern formation

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3645016

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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    References

    S. Kumar, Q. Hu, and J. L. Reno, Appl. Phys. Lett. 94, 131105 (2009)APPLAB000094000013131105000001.

    Q. Y. Lu, Y. Bai, N. Bandyopadhyay, S. Slivken, and M. Razeghi, Appl. Phys. Lett. 98, 181106 (2011)APPLAB000098000018181106000001.

    B. G. Lee, M. A. Belkin, R. Audet, J. MacArthur, L. Diehl, C. Pflugl, D. C. Oakley, D. Chapman, A. Napoleone, D. Bour, S. Corzine, G. Hofler, J. Faist, and F. Capasso, Appl. Phys. Lett. 91, 231101 (2007)APPLAB000091000023231101000001.

    Y. Bai, N. Bandyopadhyay, S. Tsao, S. Slivken, and M. Razeghi, Appl. Phys. Lett. 98, 181102 (2011)APPLAB000098000018181102000001.


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