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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.
Published in:
Applied Physics Letters
(Volume:99
,
Issue:
13
)
Date of Publication: Sep 2011
- Page(s):
- 131106 - 131106-3
- ISSN :
- 0003-6951
- Digital Object Identifier :
- 10.1063/1.3645016
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 29 September 2011
- Issue Date :
- Sep 2011
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