Optimization of a KDP-based acoustooptic tunable filter

Voloshinov, V. B.; Bogomolov, D.V.; Trokhimovskiĭ, A. Yu.

doi:10.1134/s1063784206010105

Cited by 6 publications

(5 citation statements)

References 10 publications

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“…Also, at such high frequencies, the measured acoustic attenuation in the crystal is high. The attenuation coefficient is 3.4 dB cm −1 at 500 MHz, as compared to 1.8 dB cm −1 at 300 MHz [15]. This means that intensity of filtered light will be greatly reduced over an image frame.…”

Section: Theoretical and Fabrication Considerations For Aotf Designmentioning

confidence: 96%

“…In general, the birefringent materials that can be used for imaging in this spectral region are sapphire (α-Al 2 O 3 ), ammonium dihydrophosphate (ADP), potassium dihydrophosphate (KDP), and magnesium fluoride (MgF 2 ) [1][2][3][4][5][6][7][8][14][15][16][17][18][19]. We developed noncollinear AOTFs using KDP, MgF 2 , and TeO 2 , with the objective of examining their hyperspectral imaging performance in the UV to visible region [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…The corresponding acoustic drive frequencies at this angle exceed 500 MHz. These frequencies are too high to launch in the crystal from a transducer design point of view as well as due to the high attenuation of sound in the crystal [14,15]. Our first KDP AOTF (KDP-1) was fabricated with α = 6 • and had an angular aperture of 1.2 • [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Spectral characterization in deep UV of an improved imaging KDP acousto-optic tunable filter

Gupta¹,

Voloshinov²

2014

J. Opt.

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Recently, we developed a number of high quality noncollinear acousto-optic tunable filter (AOTF) cells in different birefringent materials with UV imaging capability. Cells based on a single crystal of KDP (potassium dihydrophosphate) had the best transmission efficiency and the optical throughput needed to acquire high quality spectral images at wavelengths above 220 nm. One of the main limitations of these imaging filters was their small angular aperture in air, limited to about 1.0 • . In this paper, we describe an improved imaging KDP AOTF operating from the deep UV to the visible region of the spectrum. The linear and angular apertures of the new filter are 10 × 10 mm 2 and 1.8 • , respectively. The spectral tuning range is 205-430 nm with a 60 cm −1 spectral resolution. We describe the filter and present experimental results on imaging using both a broadband source and a number of light emitting diodes (LEDs) in the UV, and include the measured spectra of these LEDs obtained with a collinear SiO 2 filter-based spectrometer operating above 255 nm.

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Section: Theoretical and Fabrication Considerations For Aotf Designmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spectral characterization in deep UV of an improved imaging KDP acousto-optic tunable filter

Gupta¹,

Voloshinov²

2014

J. Opt.

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“…The electro-optic effect in KDP is used to obtain phase and amplitude modulations [1,2]. The acousto-optic tunable filters have been developed using KDP [3]. For the inertial confinement fusion (ICF) experiments the performance of large aperture switches based on KDP have been assessed for high power laser experiments [4,5].…”

Section: Introductionmentioning

confidence: 99%

Growth and characterization of L‐alanine doped KDP crystals

Parikh

Dave

Parekh

et al. 2010

Cryst. Res. Technol.

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Potassium Dihydrogen Phosphate (KDP) is an excellent inorganic nonlinear optical (NLO) material with different device applications. Most of amino acids possess NLO property; therefore, it is of interest to dope them in KDP crystals. In the present study, amino acid L-alanine doped KDP crystals were grown by slow aqueous solvent evaporation technique. The doping of L-alanine was confirmed by the paper chromatography, the CHN analysis and the FT-IR spectroscopy. The powder XRD was carried out to assess the single phase nature of the samples. The effect of doping on thermal stability of the crystals was studied by TGA and the kinetic and thermodynamic parameters of dehydration were evaluated. As the amount of doping increased the thermal stability of crystals decreased. However, the second harmonic generation (SHG) efficiency and the UV-Vis spectroscopy studies indicated that as the L-alanine doping increased the SHG efficiency and optical transmission percentage increased. The dielectric behavior of the samples has been studied. The variation of dielectric constant, dielectric loss (tanδ), a.c.resistivity and a.c.conductivity with frequency of applied field in the range from 100 Hz to 100 kHz was studied. The dielectric constant and dielectric loss decreased with increase the value of frequency of applied field. The dielectric constant and the dielectric loss values of L-alanine doped KDP crystals were lower than the pure KDP crystals. The results are discussed.

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“…In the 42mðx 1 k 2Þ point group (Fig. 1) belong a plethora of crystals, such as potassium dihydrogen phosphate (KDP), ammonium dihydrogen phosphate (ADP) and others (Landolt-Bö rnstein, 1996), that are exploitable in several technologies, including modulators (Chen et al, 2007;Yu et al, 2005), switches (Tanushi & Yokoyama, 2006;Tsao & Hung, 2004), second harmonic generation (Awwal et al, 2006;Dubietis, 2000;Mironov et al, 2009;Mitra et al, 2006), lasers (De Yoreo et al, 2002;Yang et al, 2002;Raghuramaiah et al, 2003), tunable filters (Prasad, 2007;Weber et al, 2010;Voloshinov et al, 2006) and sensing (Silva et al, 2008). These crystals are noncentrosymmetric and non-enantiomorphous, possessing natural birefringence (n 01 , n 03 ) and optical activity (g 11 ) in directions different from the symmetry planes and along the optical axis.…”

Section: Introductionmentioning

confidence: 99%

Electro-optic and electro-gyration effects on light propagation in \bf \overline 4 2mpoint-group crystals

et al. 2011

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Several nonlinear crystals that are used in laser and optical signal processing technologies belong to the 42m point group. This group exhibits as primary effects natural birefringence, optical activity, linear and quadratic electro-optic effects, and linear and quadratic electro-gyration effects, and, as secondary effects, photo-elasticity and piezo-gyration via the inverse piezo-electric phenomenon. The combination of these effects makes the study of light propagation a complicated task. In this work, the influence of each of these effects on light propagation is analytically reviewed, and suitable configurations for the light propagation and applied electric field directions are identified, which decouple the contribution of the individual effects. It is found that the complete decoupling of the linear electro-gyration from the linear electro-optic effect is not possible for this symmetry, while the inverse is feasible, and that the separation of the quadratic from the linear electro-optic effect can be achieved. For the linear phenomena, index ellipsoid geometries and eingenpolarizations are calculated, and analytic expressions are derived for the intensity of a light beam propagating through a crystal followed by a polarizer, thus providing valuable information for the design of devices and/or measurements of corresponding coefficients. ‡ Present address: Helmholtz Zentrum Mü nchen,

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Optimization of a KDP-based acoustooptic tunable filter

Cited by 6 publications

References 10 publications

Spectral characterization in deep UV of an improved imaging KDP acousto-optic tunable filter

Spectral characterization in deep UV of an improved imaging KDP acousto-optic tunable filter

Growth and characterization of L‐alanine doped KDP crystals

Electro-optic and electro-gyration effects on light propagation in \bf \overline 4 2mpoint-group crystals

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