Imaging with photoelastic modulators

Shane Nichols; John Freudenthal; Oriol Arteaga; Bart Kahr

doi:10.1117/12.2053459

21 May 2014 Imaging with photoelastic modulators

Shane Nichols, John Freudenthal, Oriol Arteaga, Bart Kahr

Proceedings Volume 9099, Polarization: Measurement, Analysis, and Remote Sensing XI; 909912 (2014) https://doi.org/10.1117/12.2053459
Event: SPIE Sensing Technology + Applications, 2014, Baltimore, MD, United States

Abstract

Photoelastic modulators (PEMs) are among the most robust and precise polarization modulation devices, but the high frequency free-running nature of PEMs challenges their incorporation into relatively slow CCD and CMOS imaging systems. Current methods to make PEMs compatible with imaging suffer from low light throughput or use high cost intensified CCDs. They are not ideal for some analyses (microscopy, reflectivity, fluorescence, etc.), and likely cannot be extended to polarimeters with more than two PEMs. We propose to modulate the light source with a square wave derived from particular linear combinations of the elementary PEM frequencies and phases. The real-time synthesis of the square waves can be achieved using a field programmable gate array (FPGA). Here we describe the operating principle.

Citation Download Citation

Shane Nichols, John Freudenthal, Oriol Arteaga, and Bart Kahr "Imaging with photoelastic modulators", Proc. SPIE 9099, Polarization: Measurement, Analysis, and Remote Sensing XI, 909912 (21 May 2014); https://doi.org/10.1117/12.2053459

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