期刊
APPLIED PHYSICS LETTERS
卷 94, 期 13, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3114418
关键词
heat sinks; laser beams; leakage currents; optical design techniques; oscillator strengths; quantum cascade lasers; submillimetre wave lasers; thermo-optical effects
资金
- AFOSR
- NASA
- NSF
- Lockheed Martin Co. [DE-AC04-94AL85000]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [853470] Funding Source: National Science Foundation
Resonant-phonon terahertz quantum-cascade lasers operating up to a heat-sink temperature of 186 K are demonstrated. This record temperature performance is achieved based on a diagonal design, with the objective to increase the upper-state lifetime and therefore the gain at elevated temperatures. The increased diagonality also lowers the operating current densities by limiting the flow of parasitic leakage current. Quantitatively, the diagonality is characterized by a radiative oscillator strength that is smaller by a factor of two from the least of any previously published designs. At the lasing frequency of 3.9 THz, 63 mW of peak optical power was measured at 5 K, and approximately 5 mW could still be detected at 180 K.
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