Acousto-optic tunable filter using double interaction for sidelobe reduction

Jean-Claude Kastelik; Hichem Benaissa; Samuel Dupont; Michel Pommeray

doi:10.1364/AO.48.0000C4

Applied Optics
Vol. 48,
Issue 7,
pp. C4-C10
(2009)
•https://doi.org/10.1364/AO.48.0000C4

Acousto-optic tunable filter using double interaction for sidelobe reduction

Jean-Claude Kastelik, Hichem Benaissa, Samuel Dupont, and Michel Pommeray

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Jean-Claude Kastelik, Hichem Benaissa, Samuel Dupont, and Michel Pommeray, "Acousto-optic tunable filter using double interaction for sidelobe reduction," Appl. Opt. 48, C4-C10 (2009)

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Abstract

We present a bifrequency acousto-optic tunable filter (AOTF) for applications using polychromatic laser beams. The acousto-optic device is based on two successive anisotropic interactions in paratellurite: the first takes place with an acoustic shear wave tilted at $10 °$ from the [110] axis, while the latter is provided by the acoustic shear wave propagating collinear to the [110] axis. It is then demonstrated that the sidelobes of the impulse response to optical wavelengths of such a bifrequency AOTF are greatly reduced. General expressions of operating frequencies, spectral bandwidths, and acoustic powers are derived. Numerical computations have been drawn for paratellurite. The bifrequency AOTF has been tested using a multiline beam radiated by an argon laser. According to the spectral power distribution of this polychromatic laser beam, the most critical configurations of wavelength filtration have been considered. Experimental results confirm the theoretical predictions.

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Equations (19)

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	$θ_{a} = 10 °$			$θ_{a} = 0 °$
$λ_{0} (nm)$	$f_{1} (MHz)$	$P_{0} (mW)$	$R_{1} (λ_{0} / Δ λ_{1}) L = 3.5 mm$	$f_{2} (MHz)$	$P_{0} (mW)$	$R_{2} (λ_{0} / λ_{1}) L = 2.6 mm$	$R (λ_{0} / Δ λ)$
458	184.3	143	176	87.4	82	176	229
476.5	173.8	162	159	82.4	93	159	216
488	167.9	174	152	79.5	100	152	212
496.5	163.8	183	146	77.6	105	146	207
514.5	155.9	203	143	73.8	116	143	198

Wavelength $λ_{0} (nm)$	Power $P (W)$
458	0.15
476.5	0.3
488	0.7
496.5	0.3
514.5	0.8

	Interaction $θ_{a} = 10 °$			Interaction $θ_{a} = 0 °$
$λ_{c} = 488 nm$ $λ_{s} = 496.5 nm$	Frequency $f_{1} (MHz)$	Electrical Power $P_{1} (mW)$	Diffraction Efficiency $η_{1} (%)$	Frequency $f_{2} (MHz)$	Electrical Power $P_{2} (mW)$	Diffraction Efficiency $η_{2} (%)$	Dynamic Range $D (dB)$
Single frequency mode	167.9	300	80	-	-	-	19
Bifrequency mode	167.9	300	80	79.5	200	80	36

		Interaction $θ_{a} = 10 °$			Interaction $θ_{a} = 0 °$
$λ_{c} = 496 nm$ $λ_{s 1} = 488 nm$ $λ_{s 2} = 514.5 nm$		Frequency $f_{1} (MHz)$	Electrical Power $P_{1} (mW)$	Diffraction Efficiency $η_{1} (%)$	Frequency $f_{2} (MHz)$	Electrical Power $P_{2} (mW)$	Diffraction Efficiency $η_{2} (%)$	Dynamic Range $D (dB)$
Single frequency mode	$λ_{s 1}$	163.8	300	80	-	-	-	15
Single frequency mode	$λ_{s 2}$	163.8	300	80	-	-	-	14
Bifrequency mode	$λ_{s 1}$	163.8	300	80	77.6	200	80	35
Bifrequency mode	$λ_{s 2}$	163.8	300	80	77.6	200	80	34

	$θ_{a} = 10 °$			$θ_{a} = 0 °$
$λ_{0} (nm)$	$f_{1} (MHz)$	$P_{0} (mW)$	$R_{1} (λ_{0} / Δ λ_{1}) L = 3.5 mm$	$f_{2} (MHz)$	$P_{0} (mW)$	$R_{2} (λ_{0} / λ_{1}) L = 2.6 mm$	$R (λ_{0} / Δ λ)$
458	184.3	143	176	87.4	82	176	229
476.5	173.8	162	159	82.4	93	159	216
488	167.9	174	152	79.5	100	152	212
496.5	163.8	183	146	77.6	105	146	207
514.5	155.9	203	143	73.8	116	143	198

Abstract

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Figures (11)

Tables (3)

Equations (19)

Applied Optics