Simultaneous frequency locking and monitoring using a bi-directional THz quantum cascade laser

B. Mirzaei, N. Van Marrewijk, D Hayton, J. R. Gao, T. Y. Kao, Q. Hu, John L. Reno

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

We have performed frequency locking of a dual, forward reverse emitting 3rd 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 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.

Original languageEnglish
Title of host publication27th International Symposium on Space Terahertz Technology, ISSTT 2016
PublisherInternational Symposium on Space Terahertz Technology (ISSTT)
Number of pages4
Publication statusPublished - 2017
Event27th International Symposium on Space Terahertz Technology, ISSTT 2016 - Nanjing, China
Duration: 12 Apr 201615 Apr 2016

Conference

Conference27th International Symposium on Space Terahertz Technology, ISSTT 2016
CountryChina
CityNanjing
Period12/04/1615/04/16

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