Carl C Aleksoff

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Imaging through scattering media such as fog is a problem with few known viable solutions. Holographic techniques have been demonstrated successfully in the laboratory, but their usefulness is often limited in field conditions by the requirement of a separate coherent reference beam. In this paper, an interferometric imaging technique that utilizes a(More)
The concept of a programmable multipurpose computation module for residue arithmetic is introduced. A possible design for the module is also presented. The application of the computation module in mathematical computation, coding, decoding, and scaling is demonstrated. Very high throughput rate is achieved by the use of parallel computation structures and(More)
Supercontinuum (SC) light with a continuous spectrum covering 0.45-1.2 microm is scaled from 250-740 mW by varying the repetition rate of an amplified, frequency doubled, telecom laser diode. Efficient SC generation requires minimal non-linearity in the amplifier and anomalous dispersion pumping close to the fiber zero dispersion wavelength. Based on(More)
The Doppler frequency shift of coherent light reflected from rotating objects is used to obtain one-dimensional resolution much greater than the classical limit for aperture limited imaging systems. The Doppler information is processed by using the temporal and spatial filtering properties of modulated-referencewave holograms. The holographic reconstruction(More)
It is shown that temporal modulation of the object and/or reference wave in holographic interferometry can advantageously control fringe characteristics. The work presented is based on the concept that the hologram recording process acts as a filter applied to the cross correlation between the conjugate of the reference wave spectrum with the object wave(More)
Three-dimensional (3D) shape reconstructions and metrology measurements are often limited by depth-of-field constraints. Current focus-detection-based techniques are insufficient to profile out-of-focus 3D objects with high axial accuracy. Extended-focus imaging (EFI) techniques can improve the range and precision of such measurements. By incorporating(More)
We propose a multiple height-transfer interferometric technique based on concepts from both multiple wavelength interferometry and wavelength scanning interferometry. Conventional multiple wavelength interferometry requires accurate wavelength information for large step height measurement, while wavelength scanning interferometry is limited by mode-hop-free(More)
A line scan interferometer, which comprises a visible supercontinuum source coupled to Fourier domain Michelson interferometer, is used to obtain 3D images of ~300 μm high solder balls on a semiconductor die with 125 nm axial and 15 μm lateral resolution. The ability to measure curved surfaces enables the determination of solder ball shape defects in(More)
Matched spatial filters were constructed for various modes of a spherical Fabry-Perot interferometer (FPSI). The cross correlation between many of these modes was obtained experimentally as well as theoretically. The orthogonality between various modes was demonstrated and used in order to discriminate against all orthogonal modes. A discrimination funtion(More)
Existing interferometric techniques for imaging through scattering media require coherent illumination and stationary targets. We introduce a new grating interferometer that is capable of imaging an incoherently illuminated target regardless of whether the targets and the scatterers are moving or stationary. This interferometer is particularly useful for(More)