Waveguide Bragg light modulators made of CdSxSe1-xcrystals

Buachidze, Z É; Goldobin, I S; Morozov, V N; Pletnev, V A; Семенов, А С; Shapkin, P. V.

doi:10.1070/qe1986v016n04abeh006209

Cited by 4 publications

(1 citation statement)

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“…It reaches 2 dB/cm at the frequency 0.1 GHz for the case of longitudinal AWs and 20 dB/cm at 0.5 GHz for the case of transverse AWs propagating perpendicular to the c axis [17]. Nonetheless, waveguide AO Bragg modulators have been successfully fabricated on the basis of CdS [18]. It has been shown experimentally that the acoustic power necessary for the complete transfer of optical power out from the zeroth diffraction order is equal to 15 mW at the operation frequency 10 MHz of the modulator.…”

Section: Introductionmentioning

confidence: 99%

Anisotropy of acousto-optic figure of merit at the collinear acousto-optic diffraction in hexagonal CdS crystals

Mys¹,

Martynyuk-Lototska²,

Adamenko³

et al. 2018

Ukr. J. Phys. Opt.

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Abstract.In the present work we analyze anisotropy of the acoustic properties and acousto-optic figure of merit (AOFM) in CdS crystals at the collinear acousto-optic interactions. We show that the anisotropy of AW velocity is very small so that the AOFM anisotropy is mainly caused by the anisotropy of effective elastooptic coefficients. The obliquity angle and the angle of deviation of polarization of the acoustic waves (AWs) from purely longitudinal and transverse types are found. The geometries of collinear diffraction at which the maximal AOFM values are reached are determined. It is found that the absolute maximum, M 2 = 86.2610 -15 s 3 /kg, is peculiar for the type VIII of interactions with the AW QT 1 with the frequency f = 49 MHz, which is polarized along the Z axis. In this case the interaction plane is rotated by the angle φ Z = 45 deg, and both the light and AW propagate along the X' axis lying in the XY plane. The maximal AOFM values and the appropriate interaction geometries are also determined for the particular case of collinear AO diffraction at the AWs QL and QT 2 . These values are equal to 4.4110 -15 and 26.2510 -15 s 3 /kg for the interactions with the AWs QL and QT 2 , respectively.

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Section: Introductionmentioning

confidence: 99%

Anisotropy of acousto-optic figure of merit at the collinear acousto-optic diffraction in hexagonal CdS crystals

Mys¹,

Martynyuk-Lototska²,

Adamenko³

et al. 2018

Ukr. J. Phys. Opt.

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Optical waveguide processors

Семенов¹,

Smirnov²,

Shmal'ko³

1987

Sov. J. Quantum Electron.

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Short reaction time Geiger counters have been used at sea level to study the time coherence of associated cosmic ray particles under 18cm of Pb, and also in air. A 50-channel hodoscope has been used to identify the events giving coincidences between two 138cm2 trays of these counters separated by 15 cm in a horizontal plane. No evidence was found for delays between associated particles of the order of 2 x 1W8sec, as reported by Robinson using spark counters, although the counter resolving time of 1.4 x sec should have allowed detection of the effect. Multiple hits by particles on the Geiger counter trays were found t o give modified counter reaction time distributions, and it is suggested that a similar effect could occur in spark counters. A theory which accounts for the behaviour of both spark and Geiger counters under multiple hit conditions has been developed. PNYS. SOC. LXVII, 12-A 72 1 time 1 intervals 0.6 0.2+0.1 0.2, -3.5, -0.7, 1 1.47+ 0.03 J -1.6, -2.0,1.3, -3.5 100 33*2_+0+9 O~OOk0.04 t These numbers do not sum to 1422 because 16 mm film magazine trouble caused the loss of some Pictures.One interval was outside the range of mczisurement.

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