Terahertz quantum-cascade-laser source based on intracavity difference-frequency generation
Belkin, Mikhail A.
Sivco, Deborah L.
Cho, Alfred Y.
Oakley, Douglas C.
Vineis, Christopher J.
Turner, George W.
MetadataShow full item record
CitationBelkin, Mikhail A., Federico Capasso, Alexey Belyanin, Deborah L. Sivco, Alfred Y. Cho, Douglas C. Oakley, Christopher J. Vineis, and George W. Turner. 2007. “Terahertz Quantum-Cascade-Laser Source Based on Intracavity Difference-Frequency Generation.” Nature Photonics 1 (5): 288–92. https://doi.org/10.1038/nphoton.2007.70.
AbstractThe terahertz spectral range (lambda = 30-300 mu m) has long been devoid of compact, electrically pumped, room-temperature semiconductor sources(1-4). Despite recent progress with terahertz quantum cascade lasers(2-4), existing devices still require cryogenic cooling. An alternative way to produce terahertz radiation is frequency down-conversion in a nonlinear optical crystal using infrared or visible pump lasers(5-7). This approach offers broad spectral tunability and does work at room temperature; however, it requires powerful laser pumps and a more complicated optical set-up, resulting in bulky and unwieldy sources. Here we demonstrate a monolithically integrated device designed to combine the advantages of electrically pumped semiconductor lasers and nonlinear optical sources. Our device is a dual-wavelength quantum cascade laser(8) with the active region engineered to possess giant second-order nonlinear susceptibility associated with intersubband transitions in coupled quantum wells. The laser operates at lambda(1) = 7.6 mu m and lambda(2) = 8.7 mu m, and produces terahertz output at lambda = 60 mu m through intracavity difference-frequency generation.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:41371441
- FAS Scholarly Articles