Glancing angle deposition (GLAD) is a novel way to produce nanostructural thin films with engineered porosity, and it is
possible to make new optical components in laser systems. In this paper, ZrO2, SiO2 and TiO2 thin films were grown by
electron beam evaporation with GLAD technique. Different microstructures were observed. The optical properties, such
as transmittance and refractive index were characterized. As application of the GLAD thin films, several optical
components were designed and fabricated, such as graded-index rugate filter, broadband antireflection coating and phase
retardater for visible and near infrared laser systems. Finally, laser-induced damage threshold were measured and
discussed.
GLAD ZnS films prepared by electron beam evaporation method with glancing angle deposition technique are reported. The influence of different oblique angle on the structure and optical properties is investigated using atomic force microscopy and transmittance spectra. The GLAD ZnS films exhibit a porous structure with isolated island and columnar formed. The surface roughness increases with the increase of oblique angle. The refractive indexes of GLAD ZnS films are lower than that of corresponding bulk materials. The maximal birefringence is obtained at oblique angle α=80o, which is ascribed to the orientated growth and anistropic structure of GLAD films. Therefore, the glancing angle deposition technique is a promising technique to obtain enhanced birefringence property.
The nonlinear-optical properties of poly (p-phenylene- vinylene) (PPV) were studied. The sign and size of the real and imaginary part of (chi) (3) have been measured at 532 nm to be -5.168 multiplied by 10-9 esu and -1.952 multiplied by 10-9 esu, respectively by the Z-scan method. The nonlinear refractive index n2 is of -4.271 multiplied by 10-9 esu, and all-optical switching in the PPV thin-film waveguide was observed by prism coupling.
The picosecond optical bistability of Zn1-xCdxSe/ZnSe (x equals 0.23) multiple quantum well (MQW) has been observed by a Streak Camera at room temperature for the first time. In the absorption spectra of ZnCdSe/ZnSe MQW, there are two peaks at 515 nm and 530 nm. We discussed the origin of the two peaks and physical mechanism of the bistability.
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