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Proceedings Paper

Simultaneous multi-wavelength laser spot detection and beam wander measurement using novel polymer imaging system
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Paper Abstract

Comparison of optical propagation properties in different wavelength regimes are difficult to measure, especially in continuous varying environment. Detector and measurement equipment are typically optimized for specific spectral band and utilize matching amplifiers with have different response and process time making it hard or impossible to match time sensitive data. In this paper we propose the use of a wavelength conversion imaging system which has a broad spectral response and large detector size for synchronous multi-wavelength measurement. We showcase the strength of this approach in comparing the effect of turbulence media on a 1.55 μm and a 4 μm lasers at ambient (20 °C), 45 °C and 75 °C air temperature. Recording the movement and size of the lasers spot and comparing it frame to frame allows for extraction of the effect of turbulence on the individual lasers. Furthermore using cross correlation technique the conditions under which a good comparison can be identified. The result shows peak at 0s time shift for 45 °C and 75 °C which confirms the correlated measurement while the beam wander shows no correlation for ambient temperature as it is random.

Paper Details

Date Published: 13 May 2019
PDF: 6 pages
Proc. SPIE 10980, Image Sensing Technologies: Materials, Devices, Systems, and Applications VI, 109801C (13 May 2019); doi: 10.1117/12.2519231
Show Author Affiliations
Prajnesh Kumar, Stevens Institute of Technology (United States)
Ting Bu, Stevens Institute of Technology (United States)
Dayu Zhang, Stevens Institute of Technology (United States)
Rainer Martini, Stevens Institute of Technology (United States)


Published in SPIE Proceedings Vol. 10980:
Image Sensing Technologies: Materials, Devices, Systems, and Applications VI
Nibir K. Dhar; Achyut K. Dutta; Sachidananda R. Babu, Editor(s)

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