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Mid-infrared tunable two-dimensional Talbot array illuminator
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Image of FIG. 1.
FIG. 1.

A coherent radiation beam is produced by a DFG process. Then, a TAI is realized by propagation through a tunable, 2D phase grating. The latter consists of a domain-engineered -cut lithium niobate crystal covered with a couple of ITO electrodes. The actual domain structure in a selected region of the PA sample is also shown. The following legend holds: diode laser, fiber amplifier, , mirror, lens, , filter, and generator.

Image of FIG. 2.
FIG. 2.

Transmittance curves recorded by FTIR spectroscopy for a 400-nm-thick ITO film deposed on a substrate by the dc-pulsed and rf technique, respectively. Deposition settings for the former are the same as those given in the text except for duration (20 min in this case), while for the latter technique the list of optimized parameters is , , Ar , , and . Absorption features due to atmospheric and ions present in are also visible.

Image of FIG. 3.
FIG. 3.

Optical transmission values for three different ITO thickness values as measured by the DFG source emitting at . Triangles (squares) data points correspond to the dc-pulsed (rf) case; the ratio between them exhibits a linear behavior as a function of thickness (see inset).

Image of FIG. 4.
FIG. 4.

Intensity distribution patterns generated at different fractions of the Talbot distance for a fixed applied voltage . Each frame in the upper row is shown together with its corresponding complementary in the same column. The election of the reported Talbot planes was due to the fact that such planes showed sharper intensity features. For the sharpest distributions [planes and ], a power exceeding in each spot is measured (corresponding to an optical intensity of about ).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Mid-infrared tunable two-dimensional Talbot array illuminator