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Title: Frequency locking and monitoring based on Bi-directional terahertz radiation of a 3rd-order distributed feedback quantum cascade laser

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.
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5]
  1. Delft Univ. of Technology, Delft (The Netherlands)
  2. SRON Netherlands Institute for Space Research, Utrecht (The Netherlands)
  3. Delft Univ. of Technology, Delft (The Netherlands); SRON Netherlands Institute for Space Research, Utrecht (The Netherlands)
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  5. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 1866-6892; PII: 210
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Infrared, Millimeter, and Terahertz Waves
Additional Journal Information:
Journal Volume: 36; Journal Issue: 12; Journal ID: ISSN 1866-6892
Research Org:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS terahertz; quantum cascade lasers (QCLs); frequency locking; third-order distributed feedback; semiconductor lasers, quantum cascades; far infrared or terahertz; heterodyne; linewidth; detectors