Spectropolarimetric detection using photoelastic modulators and acousto-optic tunable filter

Rui Zhang; Tingdun Wen; Yaoli Wang; Zhibin Wang; Kewu Li

doi:10.1364/AO.54.008686

Applied Optics
Vol. 54,
Issue 29,
pp. 8686-8693
(2015)
•https://doi.org/10.1364/AO.54.008686

Spectropolarimetric detection using photoelastic modulators and acousto-optic tunable filter

Rui Zhang, Tingdun Wen, Yaoli Wang, Zhibin Wang, and Kewu Li

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Rui Zhang, Tingdun Wen, Yaoli Wang, Zhibin Wang, and Kewu Li, "Spectropolarimetric detection using photoelastic modulators and acousto-optic tunable filter," Appl. Opt. 54, 8686-8693 (2015)

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- Spectroscopy
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About this Article
History
- Original Manuscript: April 21, 2015
- Revised Manuscript: September 2, 2015
- Manuscript Accepted: September 4, 2015
- Published: October 7, 2015
Virtual Issues
Virtual Journal for Biomedical Optics Vol. 10, Iss. 10

Abstract

This paper proposes a spectropolarimetric detection method based on three photoelastic modulators (3PEMs) and an acousto-optic tunable filter (AOTF). Operating the 3PEMs at slightly resonant frequencies $(ω_{1}, ω_{2}, ω_{3})$ generates a different frequency signal that modulates the polarized component of the incident light at a low-frequency (0, $2 ω_{1} - 2 ω_{3}$ , $ω_{2} - ω_{3}$ ). The frequency of the low-frequency modulation component is two to three orders of magnitude lower than the resonant frequency of any of the 3PEMs so the general area array detector can realize the detection. $I$ , $Q$ , and $U$ of the incident light’s Stokes parameters can be obtained in only one detection by extracting the low-frequency component from the detector’s signals, and then combining it with an AOTF to finally realize the spectropolarimetric imaging detection. The paper introduces the basic principle, preliminarily verifies feasibility through a corresponding numerical simulation and experiment, and makes an error analysis on the polarization detection results according to factors of difference frequency and phase delay amplitude. The theory has potential application value to spectropolarimetric technology.

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		Theoretical Value			Experiment Result
Wavelengh $λ / nm$	G-T Polarizer Direction	$q$ , $u$	DoLP	AoLP	$q^{'}$ , $u^{'}$	${DoLP}^{'}$	${AoLP}^{'}$	$\frac{Δ DoLP}{DoLP}$	$Δ AoLP$
500	0°	$q = 1.000$ $u = 0.000$	1.00	0°	$q^{'} = 0.999$ $u^{'} = 0.002$	0.999	0.06°	0.1%	0.06°
	22.5°	$q = 0.707$ $u = 0.707$	1.00	22.5°	$q^{'} = 0.709$ $u^{'} = 0.7137$	1.00	22.58°	0.0%	0.08°
	45°	$q = 0.000$ $u = 1.000$	1.00	45°	$q^{'} = 0.001$ $u^{'} = 0.998$	0.998	44.97°	0.2%	0.03°
	90°	$q = - 1.000$ $u = 0.000$	1.00	90°	$q^{'} = - 0.997$ $u^{'} = 0.001$	0.997	89.97°	0.3%	0.03°
	135°	$q = 0.000$ $u = - 1.000$	1.00	135°	$q^{'} = 0.002$ $u^{'} = - 0.996$	0.996	135.06°	0.4%	0.06°
600	30°	$q = 0.500$ $u = 0.866$	1.00	30°	$q^{'} = 0.501$ $u^{'} = 0.863$	0.998	29.93°	0.2%	0.07°
	60°	$q = - 0.500$ $u = 0.866$	1.00	60°	$q^{'} = - 0.498$ $u^{'} = 0.866$	0.999	59.95°	0.1%	0.05°
	90°	$q = - 1.000$ $u = 0.000$	1.00	90°	$q^{'} = - 0.996$ $u^{'} = 0.002$	0.996	89.94°	0.4%	0.06°
	120°	$q = - 0.500$ $u = - 0.866$	1.00	120°	$q^{'} = - 0.499$ $u^{'} = - 0.867$	1.00	120.04°	0.0%	0.04°
	150°	$q = 0.500$ $u = - 0.866$	1.00	150°	$q^{'} = 0.501$ $u^{'} = - 0.864$	0.999	150.05°	0.1%	0.05°
700	40°	$q = 0.174$ $u = 0.985$	1.00	40°	$q^{'} = 0.171$ $u^{'} = 0.983$	0.998	40.07°	0.2%	0.07°
	70°	$q = - 0.766$ $u = 0.643$	1.00	70°	$q^{'} = - 0.759$ $u^{'} = 0.634$	0.989	70.06°	1.1%	0.06°
	100°	$q = - 0.940$ $u = - 0.342$	1.00	100°	$q^{'} = - 0.938$ $u^{'} = - 0.338$	0.997	99.91°	0.3%	0.09°
	130°	$q = - 0.174$ $u = - 0.985$	1.00	130°	$q^{'} = - 0.175$ $u^{'} = - 0.982$	0.997	129.95°	0.3%	0.05°
	160°	$q = 0.766$ $u = - 0.643$	1.00	160°	$q^{'} = 0.765$ $u^{'} = - 0.643$	0.999	159.98°	0.1%	0.02°

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Applied Optics