Detection sensitivity of laser feedback interferometry using a terahertz quantum cascade laser | Zendy

James Keeley | Zendy; Karl Bertling | Zendy; Pierluigi Rubino | Zendy; Yah Leng Lim | Zendy; Thomas Taimre | Zendy; Xiaoqiong Qi | Zendy; Iman Kundu | Zendy; Lianhe Li | Zendy; D. Indjin | Zendy; Aleksandar D. Rakić | Zendy; E. H. Linfield | Zendy; A. G. Davies | Zendy; J. E. Cunningham | Zendy; Paul Dean | Zendy

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Detection sensitivity of laser feedback interferometry using a terahertz quantum cascade laser

Author(s) -

James Keeley,

Karl Bertling,

Pierluigi Rubino,

Yah Leng Lim,

Thomas Taimre,

Xiaoqiong Qi,

Iman Kundu,

Lianhe Li,

D. Indjin,

Aleksandar D. Rakić,

E. H. Linfield,

A. G. Davies,

J. E. Cunningham,

Paul Dean

Publication year - 2019

Publication title -

optics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.524

H-Index - 272

eISSN - 1071-2763

pISSN - 0146-9592

DOI - 10.1364/ol.44.003314

Subject(s) - optics , quantum cascade laser , laser , cascade , interferometry , terahertz radiation , physics , distributed feedback laser , far infrared laser , sensitivity (control systems) , laser power scaling , noise (video) , optoelectronics , chemistry , chromatography , electronic engineering , engineering , artificial intelligence , computer science , image (mathematics)

We report on the high detection sensitivity of a laser feedback interferometry scheme based on a terahertz frequency quantum cascade laser (QCL). We show that variations on the laser voltage induced by optical feedback to the laser can be resolved with the reinjection of powers as low as ∼-125 dB of the emitted power. Our measurements demonstrate a noise equivalent power of ∼1.4 pW/√Hz, although, after accounting for the reinjection losses, we estimate that this corresponds to only ∼1 fW/√Hz being coupled to the QCL active region.

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