Dalip Singh Mehta

Laser-based phosphor-converted white light sources are currently being investigated for general-purpose high-brightness illumination. However, the spectral bandwidth and other colorimetric parameters are poor. We report the development of a laser-based multiphosphor-converted white light source for illumination purposes. We achieved a continuous broadband sunlike full spectrum (SFS) for the first time, to the best of our knowledge.

This paper presents the development of a single-shot, partially spatially coherent quantitative differential phase contrast microscopy (Q-DPCM) system. The optical scheme comprises a polarizer, lenses, calcite beam displacer, and analyzer, which can be seamlessly integrated to an existing bright-field microscopy system, transforming it into a Q-DPCM system.

Optical profilometers provide a non-contact, non-destructive method for swiftly profiling 3D surfaces. White light interferometers, often used for this purpose, employ a 5-phase shifting technique for precise phase maps. However, capturing multiple frames introduces mechanical movement, which impedes imaging of dynamic objects. White light’s low spatial-temporal coherence mitigates speckles and spurious fringes while offering high axial resolution.