Abstract
We developed a complex (amplitude and phase) modulation Diffractive Optical Element (DOE) with four phase levels, which is based in a glass substrate coated with DLC (Diamond Like Carbon) thin film as the amplitude modulator. The DLC film was deposited by magnetron reactive sputtering with a graphite target and methane gas in an optical glass surface. The glass and DLC film roughness were measured using non destructive methods, such as a high step meter, Atomic Force Microscopy and Diffuse Reflectance. Other properties, such as refractive index of both materials were measured. The DOEs were tested using 632.8 nm HeNe laser.
Highlights
Diffractive optical elements (DOEs) are wavefront processors used to change the distribution of an incident light beam with known properties into a specified pattern[1]
Glass Difractive Optical Elements (Does) with Complex Modulation Dlc Thin Film Coated observed that there were no significant differences in the amplitude modulation for the devices covered by Diamond like carbon (DLC) and the elements without such thin film
DOEs based in glass substrate coated with DLC thin film with complex modulation were obtained
Summary
Diffractive optical elements (DOEs) are wavefront processors used to change the distribution of an incident light beam with known properties into a specified pattern[1]. There are two main types of DOE: one is amplitude based and the other is phase-contrast. The phasecontrast is more efficient than the amplitude DOEs2. The objective of this study was the development of diffractive optical elements (DOE’s), fabricated on B 270 glass substrate, with four phasemodulation and amplitude modulation. The amplitude modulation is produced by DLC thin films (Diamond Like Carbon) deposited over glass. A DOE is a component that works according to Huygens principle[3,4,5,6,7] and modifies wavefronts by segmenting and redirecting the segments through the use of interference and phase control
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