The refractive indices of anisotropic (Lu0.9Y0.1)2SiO5 (LYSO) single crystal at different wavelengths have been measured
by the minimum deviation method at room temperature. Its refractive indices decrease quickly with the increasing
wavelength. Sellmeier dispersion equations were obtained by means of least square fitting, which can predict the
refractive indices in transparent region. The dispersion behavior was also described by single-oscillator approximation
with physical significance.
Optical properties of (1-x)Pb(Zn1/3Nb2/3)O3-xPbTiO3 (PZN-xPT, x=5%, 9% and 12%) single crystals have been
comprehensively investigated. The PZN-xPT single crystals used in this study were grown using a high temperature flux
method. Refractive indices (nij) were measured by the Brewster’s angles (θB=tan-1n) at different wavelengths. Dispersion
equations of refractive indices were obtained. After poled along [001] direction, the transmittance of PZN–12%PT single
crystal is more than 65% from 0.5 to 5.8 μm, which is much higher than that of PZN–5%PT and PZN-9%PT single
crystals. PZN–12%PT has a tetragonal phase, its spontaneous polarization PS is along [001] direction. After poling, it
could form a single domain structure. Orientation and temperature dependences of the electro-optic coefficient were
investigated at He-Ne laser by the Senarmont compensator method. Large effective electro-optic coefficient (γc = 430
pm/V) was observed in [001]-poled PZN-9%PT crystal. More importantly, γc of tetragonal PZN-12%PT is about 130
pm/V, which is almost unchanged in a temperature range -20~80 °C. The γc of PZN-xPT single crystals are much higher
than that of widely used electro-optic crystal LiNbO3 (γc = 20 pm/V). These excellent optical properties make the PZNxPT
single crystals promising candidates for electro-optic modulation applications.
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