Analysis of Off-Optical Axis Anisotropic Diffraction in Tellurium at 10.6 μm

<title>Information properties of acousto-optic tunable filters</title>

“…If the probability of such recognition is given, so two adjacent spectral lines can be considered resolvable if each in each individual measurement we observe Al > 0 with probability p. The signal-to-noise ratio for such measurements can be expressed as '1'L.1av/ad, (12) where May is average value of M measurements with large sampling, and astandard deviation. Expression (13) represents the modified error function which is tabulated and can be used for the numerical calculations. Hence, probability of two adjacent spectral lines distinguishing is p exp[4y L\1av)'P2/ AIav2ldy, (13) where y corresponds to the measured values of valley depth which can be found with the certain probability.…”

Optic, acoustic and acousto-optic properties of tellurium in close-to-axis regime of diffraction

“…Tl 3 AsSe 3 , calomel (Hg 2 Cl 2 ), mercurous bromide (Hg 2 Br 2 ) and iodide (Hg 2 I 2 ), have been used in modulators, deflectors and filters [4][5][6][7][8][9][10]. In the AO literature, the acoustic, optic and AO properties of Te have been examined in detail since the material was considered as one of the most promising for applications in the longer IR wavelengths [11][12][13][14][15][16][17][18][19][20][21][22]. In particular, we published a few papers in which we summarized results of our theoretical and experimental investigation of the anisotropic diffraction regime in Te crystal [17][18][19][20][21][22].…”

“…In this interaction geometry, the photoelastic coefficient p 41 is a key factor. In the literature, the value of this coefficient, p 41 was listed as 0.28, which is 1.5-2 times larger than the values for the other photoelastic constants in the crystal [13][14][15][16]. Therefore, use of a diffraction geometry dependent on the coefficient p 41 looked promising.…”

Growth and Characterization of Tellurium Single Crystals for Applications in Imaging AOTFs

“…Therefore, an AO material, which is as effective in the infrared as List of the acousto-optic materials suitable for the application in the infrared region is limited to a few crystals: TAS (Tl 3 AsSe 3 ) [7], calomel (Hg 2 Cl 2 ), mercury bromide (Hg 2 Br 2 ) [10][11][12][13][14][15] and tellurium (Te) [6,[15][16][17][18][19][20][21][22]. The single crystal of germanium may not be applied in the imaging filters because of absence of birefringence.…”

“…In this respect, tellurium attracts particular attention of designers because of its extremely high figure of merit. According to conclusions of the references [20][21][22], the figure of merit in tellurium may exceed the magnitude 18 2 10 000 500    M s 3 /g that is up to 100 times better than in TAS and calomel. However, although tellurium has been known for decades, the material has not been investigated in details, especially if the imaging acousto-optic applications are taken into the consideration.…”