Efficient acousto-optically phase-matched noncollinear optical second-harmonic genertion in tellurium

Abstract

Two kinds of efficient acousto-optically phase-matched non collinear optical SHG are predicted in Te for the incident optical wave at lO,6p in.The first one is calculated with the shear acoustic wave propagating along the X localized by the three Euler angles cp=° , 0=1 500, 1600 , 4 450, and is interpreted as being due to mixing of the incident optical wave and the acousto-optically scattered wave. The other SHG is observed with the same slow acoustic shear wave and is due to the mixing ot the two acousto-optically scattered optical waves.It is shown from absolute SHG calculations and corresponding SF10 measurements previously reported in Te, that the non linear optical coefficient which governs these high efficiency SHG interactions is d1 2 = 920 x 10-'2mfVThe corresponding SHG efficiencies are two orders of magnitude larger than the previously reported phase-matched non-collinear SHG in Te for the same input optic power and acoustic conditions.Another highly efficient SHG configuration in Te is discussed as well as the possible application of these techniques to a parametric oscillator and to a fast infrared two dimensional optical inverter array.162

Tunable wide-angle acousto-optic filter in single-crystal tellurium

“…The Te crystal belongs to the class of crystalline materials 32 (D 3 ) of the trigonal system [1,2,[14][15][16][17][18][19][20][21][22][23][24]. Te is transparent in the IR region from 4 to 23 µm and noticeably differs from other crystalline materials transparent in the IR [1][2][3][4][5][6][7][8][9][10].…”

“…For example, the indices of refraction of Te for the extraordinary and ordinary polarized light at 10.6 µm are quite large, i.e. n e = 6.25 and n o = 4.8, showing that the crystal possesses extremely strong optical anisotropy n ≡ n e − n o = 1.45 [16,[25][26][27]. The large refractive indices give rise to the high values of the Fresnel reflection coefficients for light intensity, i.e.…”

“…The progress in the development of AO devices operating in the long-wave infrared (LWIR) region of the spectrum has been hampered by a lack of birefringent materials that are transparent in this region and have high M 2 values and the inverse square dependence of diffraction efficiency on the wavelength [1][2][3]. So far, a list of AO materials suitable for applications from the mid-to long-wave IR includes TAS (Tl 3 AsSe 3 ), mercurous chloride (Hg 2 Cl 2 ), mercurous bromide (Hg 2 Br 2 ) [3][4][5][6][7][8][9][10] and tellurium (Te) [11][12][13][14][15][16][17]. Published data on all these materials, except Te, list moderate values of the AO figure of merit, i.e.…”

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

“…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. For example, the extraordinary high acousto-optic figure of merit of the material seems rather doubtful [29][30][31] because only once experiments with the crystal confirmed that the figure of merit of the crystal was really high [30]. However, the high value was observed not in a filter but deflector configuration of the crystal.…”