Abstract

Continuous wave terahertz spectroscopy based on photomixing offers the attractive feature of detecting both amplitude and phase of the terahertz radiation. Experimentally, it is challenging to achieve sufficient accuracy at a high data acquisition rate. We use two fiber stretchers as fast phase modulators in a symmetric setup. Compared to a mechanical delay stage, the fiber stretchers are rather fast ($\approx 1\mathrm{kHz}$), which enables us to record a spectrum up to 1.8 THz with a step size of 1 GHz in only 10 min. We achieve a stability of the optical path difference of around 10 μm and use low-doped Si as an example to demonstrate the performance of our spectrometer.

©2012 Optical Society of America

Enhancing the stability of a continuous-wave terahertz system by photocurrent normalization

Axel Roggenbuck, Malte Langenbach, Komalavalli Thirunavukkuarasu, Holger Schmitz, Anselm Deninger, Iván Cámara Mayorga, Rolf Güsten, Joachim Hemberger, and Markus Grüninger
J. Opt. Soc. Am. B 30(6) 1397-1401 (2013)

Large-area microstructured photomixer as scannable detector of continuous-wave terahertz radiation

Armaghan Eshaghi, Mahmoud Shahabadi, Lukas Chrostowski, and Saeid Kamal
J. Opt. Soc. Am. B 29(12) 3254-3258 (2012)

Radiation characteristics of large-area photomixer used for generation of continuous-wave terahertz radiation

Armaghan Eshaghi, Mahmoud Shahabadi, and Lukas Chrostowski
J. Opt. Soc. Am. B 29(4) 813-817 (2012)

High resolution terahertz spectroscopy of a whispering gallery mode bubble resonator using Hilbert analysis

Dominik Walter Vogt and Rainer Leonhardt
Opt. Express 25(14) 16860-16866 (2017)

Simple and cost-effective thickness measurement terahertz system based on a compact 1.55 μm λ/4 phase-shifted dual-mode laser

Han-Cheol Ryu, Namje Kim, Sang-Pil Han, Hyunsung Ko, Jeong-Woo Park, Kiwon Moon, and Kyung Hyun Park
Opt. Express 20(23) 25990-25999 (2012)