27 research outputs found
Holographic characterization of chain photopolymerization
A holographic characterization technique is developed in accordance with a general photopolymerization model. The technique allows detailed quantification of the chemical parameters, including their variation from the Trommsdorff effect. The holographic procedure is especially suited for studying the diffusion of the chemical reactants
Self-written waveguides in photopolymerizable resins
We study the optically-induced growth and interaction of self-written
waveguides in a photopolymerizable resin. We investigate experimentally how the
interaction depends on the mutual coherence and relative power of the input
beams, and suggest an improved analytical model that describes the growth of
single self-written waveguides and the main features of their interaction in
photosensitive materials.Comment: 3 pages, 3 figure
Self-enhanced diffraction from fixed photorefractive gratings during coherent reconstruction
We explore, theoretically and experimentally, the effects of self-enhancement (or self-depletion) of the diffraction which occurs during coherent reconstruction from fixed photorefractive gratings. These effects are caused by interference between a secondary grating, which forms between the readout and the reconstructed beams, and the fixed grating
All-fiber zero-insertion-loss add-drop filter for wavelength-division multiplexing
We developed and fabricated an all-fiber add–drop filter by recording a Bragg grating in the waist of an asymmetric mode converter–coupler formed by adiabatic tapering and fusing of two locally dissimilar, single-mode optical fibers. The insertion loss of the device was ~0.1 dB. A narrow spectral bandwidth (90%) were also demonstrated. In addition, the filter was polarization independent