Characterizing cellular morphology by photoacoustic spectrum analysis with an ultra-broadband optical ultrasonic detector

A transparent broadband ultrasonic detector based on an optical micro-ring resonator for photoacoustic microscopy

Photoacoustic microscopy (PAM) does not rely on contrast agent to image the optical absorption contrast in biological tissue. It is uniquely suited for measuring several tissue physiological parameters, such as hemoglobin oxygen saturation, that would otherwise remain challenging. Researchers are designing new clinical diagnostic tools and multimodal microscopic systems around PAM to fully unle...

Experience with an ultrasonic foetal pulse detector.

Ultra-Broadband Fiber-Based Optical Supercontinuum Source

Entitled: " Ultra-Broadband Fiber-Based Optical Supercontinuum Source " and submitted in partial fulfillment of the requirements for the degree of Master of Applied Science Complies with the regulations of this University and meets the accepted standards with respect to originality and quality. The supercontinuum (SC) generation has been studied intensively because of its numerous applications,...

Orbital Angular Momentum Spectrum Measurement of Ultra-broadband Optical Vortices Based on Field Reconstruction

During the last decade, an optical vortex (OV) has widely drawn attention since it refers to a unique fact that the spatial phase of an electromagnetic wave changes linearly, at its cross-section, with the azimuthal angle φ around the center point, named singularity point where there is no field distribution [1]. This special property of phase profile is described by a factor of exp(ilφ), where...

Ultra-broadband Optical Parametric Chirped Pulse Amplification By Two Broadband Pump Beams

Optical parametric chirped-pulse amplification (OPCPA) is suitable for a new approach to few-cycle, high-peak-power laser systems because of its broad gain bandwidth and large single-pass gain while maintaining negligible thermal load in a nonlinear crystal. In order to amplify ultrabroad bandwidth, various types of OPCPA schemes are proposed and demonstrated. Generally, non-collinear OPCPA (NO...