| Autor: |
Sheng-Cai Shi, John L. Reno, T. M. Klapwijk, Y. Ren, Tsung-Yu Kao, M. Cui, D. J. Hayton, Qing Hu, J. N. Hovenier, Jian-Rong Gao |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
SPIE Proceedings. |
| ISSN: |
0277-786X |
| Popis: |
We report a new experiment on a high-resolution heterodyne spectrometer using a 3.5 THz quantum cascade laser (QCL) as local oscillator (LO) and a superconducting hot electron bolometer (HEB) as mixer by stabilizing both frequency and amplitude of the QCL. The frequency locking of the QCL is demonstrated by using a methanol molecular absorption line, a proportional-integral-derivative (PID) controller, and a direct power detector. We show that the LO locked linewidth can be as narrow as 35 KHz. The LO power to the HEB is also stabilized by means of swing-arm actuator placed in the beam path in combination of a second PID controller. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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