Frequency locking and monitoring based on Bi-directional terahertz radiation of a 3rd-order distributed feedback quantum cascade laser
- Delft Univ. of Technology, Delft (The Netherlands)
- SRON Netherlands Institute for Space Research, Utrecht (The Netherlands)
- Delft Univ. of Technology, Delft (The Netherlands); SRON Netherlands Institute for Space Research, Utrecht (The Netherlands)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
In this study, we have performed frequency locking of a dual, forward reverse emitting third-order distributed feedback quantum cascade laser (QCL) at 3.5 THz. By using both directions of THz emission in combination with two gas cells and two power detectors, we can for the first time perform frequency stabilization, while monitor the frequency locking quality independently. We also characterize how the use of a less sensitive pyroelectric detector can influence the quality of frequency locking, illustrating experimentally that the sensitivity of the detectors is crucial. Using both directions of terahertz (THz) radiation has a particular advantage for the application of a QCL as a local oscillator, where radiation from one side can be used for frequency/phase stabilization, leaving the other side to be fully utilized as a local oscillator to pump a mixer.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1237356
- Report Number(s):
- SAND-2015-20760J; PII: 210
- Journal Information:
- Journal of Infrared, Millimeter, and Terahertz Waves, Vol. 36, Issue 12; ISSN 1866-6892
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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