Sinusoidal wavelength-scanning interferometer using an acousto-optic tunable filter for measurement of thickness and surface profile of a thin film

Surface and thickness measurement of a transparent film using wavelength scanning interferometry.

A wavelength scanning interferometer for measuring the surface and thickness of a transparent film has been studied. A halogen light source combined with an acousto-optic tuneable filter is used to generate a sequence of filtered light in a Linnik interferometer, which leads to a sequence of interferograms captured by a CCD camera. When a transparent thin film is measured, the reflection signal...

Wavelength-Scanning SPR Imaging Sensors Based on an Acousto-Optic Tunable Filter and a White Light Laser

A fast surface plasmon resonance (SPR) imaging biosensor system based on wavelength interrogation using an acousto-optic tunable filter (AOTF) and a white light laser is presented. The system combines the merits of a wide-dynamic detection range and high sensitivity offered by the spectral approach with multiplexed high-throughput data collection and a two-dimensional (2D) biosensor array. The ...

Pulse Measurement Techniques Using an Acousto-Optic Programmable Dispersive Filter

Programmable spectral filters, such as acousto-optic programmable dispersive filters (AOPDF, Tournois (1997)) or spatial light modulators inserted in the Fourier plane of zerodispersion lines (Froehly et al., 1983; Weiner, 2000), have opened up the field of ultrafast pulse shaping and given the ability to manipulate spectral amplitude and phase of broadband ultrashort pulses. These devices have...

A Very Compact, High Speed and Rugged Acousto-Optic Tunable Filter for Wavelength Division Demultiplexing in Fiber Optic Communication Networks

A New Profile Measurement Method for Thin Film Surface

In order to measure the surface profile of the thin films in wide area with high accuracy, the research on the new measurement method was conducted and many patents on measurement method and system were researched. Based on the physical properties of soft thin film, the method of using white interferometer and ball cantilevers for measuring the surface profile of thin film is proposed. Then, th...