Multi-wavelength spatial light shaping using generalized phase contrast

Flexible Adaptive Phase Contrast Methods Using a Spatial Light Modulator

Imaging biological objects often is a challenge as most of biological specimens are mainly phase objects. This leads to a reduced contrast. To overcome this problem without using dyes, different phase contrast imaging methods were developed. The most established methods in conventional microscopy are the so-called Zernike phase contrast and Nomarski differential interference contrast (DIC) [1]....

Femtosecond pulse shaping using spatial light modulators

We review the field of femtosecond pulse shaping, in which Fourier synthesis methods are used to generate nearly arbitrarily shaped ultrafast optical wave forms according to user specification. An emphasis is placed on programmable pulse shaping methods based on the use of spatial light modulators. After outlining the fundamental principles of pulse shaping, we then present a detailed discussio...

Optical phase encryption by phase contrast using electrically addressed spatial light modulator

We report the use of an electrically addressed liquid crystal spatial light modulator (EALCSLM) operating in the phase mode as a phase-contrast filter (PCF). As an application, an optical phase encryption system has been implemented. We encrypt and decrypt a two-dimensional phase image obtained from an amplitude image. Encrypted image is holographically recorded in a Barium titanate crystal and...

Quantitative Phase Imaging using Multi-wavelength Optical Phase Unwrapping

Monolithically integrated multi-wavelength VCSEL arrays using high-contrast gratings.

We propose a novel design for multi-wavelength arrays of vertical cavity surface-emitting lasers (VCSELs) using high-contrast gratings (HCGs) as top mirrors. A range of VCSEL cavity wavelengths in excess of 100 nm is predicted by modifying only the period and duty-cycle of the high-contrast gratings, while leaving the epitaxial layer thickness unchanged. VCSEL arrays fabricated with this novel ...