Optical beam diffraction tensor in birefringent crystals

Anisotropic diffraction of light by volume holographic grating in birefringent photorefractive crystals with extended wavelength range.

The properties of anisotropic diffraction of light by volume holographic grating in birefringent photorefractive crystals are discussed. This diffraction takes place when the refractive index for diffracted light is different from the refractive index for incident light. It is found that in some special geometry of wavevector diagram the diffraction becomes less sensitive to the wavelength mism...

Birefringent crystals in a lung cavity.

Figure 2. Birefringent crystals observed during biopsy of bronchial samples (original magnification, ϫ100). Figure 3. Gomori methemanine silver stain showing fragments of fungal hyphae (original magnification, ϫ200). Figure 1. CT scan of the chest showing right upper lung cavity Diagnosis: Pulmonary aspergillosis with calcium oxalate crystals. Radiography of the patient's chest showed a right u...

Highly birefringent optical microfibers.

Highly birefringent (Hi-Bi) air-clad silica microfibers (MFs) with wavelength and sub-wavelength scale transverse dimensions are studied theoretically and experimentally. Hi-Bi MFs are taper-drawn from the standard SMF-28 single mode fibers that are "pre-processed" by "cutting away" parts of the silica cladding on opposite sides of the fiber with a femtosecond infrared laser. Such Hi-Bi MFs hav...

Artificially disordered birefringent optical fibers.

We develop and experimentally verify a theory of evolution of polarization in artificially-disordered multi-mode optical fibers. Starting with a microscopic model of photo-induced index change, we obtain the first and second order statistics of the dielectric tensor in a Ge-doped fiber, where a volume disorder is intentionally inscribed via UV radiation transmitted through a diffuser. A hybrid ...

Optical Diffraction Radiation from a beam off a circular target