Speckle contrast reduction by linear and nonlinear photonic devices
Speckle contrast <; 3.5% was achieved by means of (i) wavelength-diversity using spectrally-broad nonlinear photonic green lasers over the 520-545nm range and (ii) polarization- and phase-diversity using birefringent nano-photonic devices.
Removal of hot spot speckle on rear projection screen using the rotating screen system
This paper investigates a method to remove hot spot speckle, which is produced by laser-long coherence, on a projection screen. The objective of the work has been to first create an image from a digital light processing (DLP) display system using an RGB laser source. We then successfully obtained a high-quality image with speckle contrast, which is less than 2% when the screen was rotated by piezoelectric motor.
Double L-theory
We develop new algebraic methods refining the Witt group of linking forms and Ranicki's torsion algebraic L-groups into double Witt groups and double L-groups. At each prime ideal of the underlying ring, our double Witt groups capture infinitely many more integral signatures of the linking form than the single Witt groups. The double L-groups are an algebraic theory of `double cobordism', refining L-theory analogously. We exhibit an exact sequence relating the double L-groups to classical projective L-theory via a double homology surgery obstruction group. 
The algebraic techniques are applied to high-dimensional knot theory to define new invariants for the study of doubly-slice knots. In particular we prove a homomorphism from the n-dimensional double concordance group to a double L-group, which factors the construction of the Blanchfield form. Some results of Stoltzfus in this area are reproved and we show that every Seifert matrix for a doubly-slice knot is hyperbolic.