Design and testing of a multi-electrode apodized acousto-optic filter for arbitrary polarized light

Samuel Dupont; Samuel Dupont; Jean-Claude Kastelik; Jean-Claude Kastelik; Jurgen VanHamel; Jurgen VanHamel

doi:10.1364/AO.514229

Applied Optics
Vol. 63,
Issue 10,
pp. 2487-2493
(2024)
•https://doi.org/10.1364/AO.514229

Design and testing of a multi-electrode apodized acousto-optic filter for arbitrary polarized light

Samuel Dupont, Jean-Claude Kastelik, and Jurgen VanHamel

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Samuel Dupont, Jean-Claude Kastelik, and Jurgen VanHamel, "Design and testing of a multi-electrode apodized acousto-optic filter for arbitrary polarized light," Appl. Opt. 63, 2487-2493 (2024)

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Abstract

We present an original acousto-optic tunable filter that is able to filter visible light from 400 to 650 nm and is designed to interact simultaneously with two polarizations. The filter shows an adjustable optical bandwidth and apodization capabilities. These features make it suitable for practical spectroscopic applications. Experimental validation is also presented.

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Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Optical range (nm)	[400, 650]
Optical incident angle (°)	13.1
Acoustic cut angle $θ_{a}$ (°)	6
Acoustic velocity $V_{ac}$ (m/s)	658
Acoustic obliquity $Ψ_{a}$ (°)	44.3
Acoustic frequency (MHz)	[65, 130]
Electrode width $[W_{1}, W_{2}, W_{3}]$ (mm)	[3, 3, 3]
$Δ F$ : extraordinary to ordinary (MHz)	2.09 at $W = 3 m m$ 1.05 at $W = 6 m m$ 0.71 at $W = 9 m m$
$Δ F$ : ordinary to extraordinary (MHz)	1.58 at $W = 3 m m$ 0.8 at $W = 6 m m$ 0.54 at $W = 9 m m$
$Δ λ$ : extraordinary to ordinary (nm)	1.2–3.6 at 400 nm5.7–17.1 at 650 nm
$Δ λ$ : ordinary to extraordinary (nm)	0.8–2.5 at 400 nm4–12 at 650 nm
$Δ θ$ : Angular aperture, $- 3 d B$ , out of crystal (°)	$\approx 2.5$ at 400 nm $\approx 4$ at 650 nm
Filter rejection ratio (dB)	$\leq 20$

Side Electrode Delta Power (dB)	Central RF Power at 90% Efficiency (dBm)	Sidelobe Intensity (%)	Second Sidelobe Intensity (%)
0	13.5	13	6
−1	13.8	8	6
−2	14.3	6	6
−3	14.5	4	6
−4	15.2	2	7
−6	16	∼0	8
−8	16.9	∼0	8

Optical range (nm)	[400, 650]
Optical incident angle (°)	13.1
Acoustic cut angle $θ_{a}$ (°)	6
Acoustic velocity $V_{ac}$ (m/s)	658
Acoustic obliquity $Ψ_{a}$ (°)	44.3
Acoustic frequency (MHz)	[65, 130]
Electrode width $[W_{1}, W_{2}, W_{3}]$ (mm)	[3, 3, 3]
$Δ F$ : extraordinary to ordinary (MHz)	2.09 at $W = 3 m m$ 1.05 at $W = 6 m m$ 0.71 at $W = 9 m m$
$Δ F$ : ordinary to extraordinary (MHz)	1.58 at $W = 3 m m$ 0.8 at $W = 6 m m$ 0.54 at $W = 9 m m$
$Δ λ$ : extraordinary to ordinary (nm)	1.2–3.6 at 400 nm5.7–17.1 at 650 nm
$Δ λ$ : ordinary to extraordinary (nm)	0.8–2.5 at 400 nm4–12 at 650 nm
$Δ θ$ : Angular aperture, $- 3 d B$ , out of crystal (°)	$\approx 2.5$ at 400 nm $\approx 4$ at 650 nm
Filter rejection ratio (dB)	$\leq 20$

Side Electrode Delta Power (dB)	Central RF Power at 90% Efficiency (dBm)	Sidelobe Intensity (%)	Second Sidelobe Intensity (%)
0	13.5	13	6
−1	13.8	8	6
−2	14.3	6	6
−3	14.5	4	6
−4	15.2	2	7
−6	16	∼0	8
−8	16.9	∼0	8

Abstract

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Applied Optics