Two-step phase shifting differential-recording digital holographic microscopy.

We present two-step phase-shifting differential-recording digital holographic microscopy (TPD-DH in microscopy) for phase imaging of microscopic transparent elements. Two CCDs are employed to record two interferograms at two different defocusing distances. The interferograms on the two CCD cameras are shifted for a phase retarder 0 and π via an all-optics phase shifting unit.

Morphology and Optical Properties of RF Sputtering Deposited Indium Nitride Layers Under Different N₂/Ar Ratio.

InN thin films were prepared using reactive radio frequency sputtering on (111) Si substrates under different N₂/Ar ratio. The surface morphology and optical properties of InN thin films were characterized by X-ray diffraction, atomic force microscopy, scanning electron microscope, energy dispersive spectrometer, and UV-visible-NIR spectrophotometer at room temperature. It was found that the growth rate and surface RMS roughness of InN layers all significantly decreased with the increasing of N₂ content in the sputtering gas.

[Investigation on optical limiting performance in solution of cobalt porphyrin].

The nonlinear optical effects of cobalt porphyrin have been investigated with three CW laser lines of 457.9, 488 and 514.5 nm, respectively.