Investigation and control of laser pointing fluctuations on stability of terahertz time domain spectrometer

Terahertz time domain spectroscopy (THz-TDS) is a well known technique for analyzing materials in terahertz regime. The stability and reproducibility of the THz signal amplitude is most crucial for reliable measurements using this technique. In this article, an extensive investigation on the origin...

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Bibliographic Details
Published in:Laser physics 2022-03, Vol.32 (3), p.35701
Main Authors: Mumtaz, Muhammad, D Khan, Sabih, Aslam Zia, M, Shahzad, Arslan, Ahmad, Izhar
Format: Article
Language:English
Subjects:
air turbulence
laser pointing
random fluctuations
terahertz
thermal drifts
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Summary:Terahertz time domain spectroscopy (THz-TDS) is a well known technique for analyzing materials in terahertz regime. The stability and reproducibility of the THz signal amplitude is most crucial for reliable measurements using this technique. In this article, an extensive investigation on the origin and the impact of beam pointing fluctuations on amplitude of THz signal is performed. These fluctuations have been reduced to minimum level with control on sources of beam pointing fluctuation including air turbulences and temperature drifts. Under these controlled conditions, the standard deviation in the measurement of refractive index and absorption coefficient have been reduced up to 1.3 × 10 − 4 and 0.2 cm −1 , respectively.
ISSN:1054-660X
1555-6611
DOI:10.1088/1555-6611/ac4bdd