Measurement of the induced refractive index in a photothermorefractive glass by a liquid-cell shearing interferometer
- 1 April 2002
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 41 (10), 1864-1871
- https://doi.org/10.1364/ao.41.001864
Abstract
A liquid-cell shearing interferometer was developed to measure refractive-index variations (Δn) in transparent materials. The cell was filled with a liquid having a matched refractive index. The achieved resolution was better than 1/1000 of a fringe shift and resulted in a Δn measurement sensitivity down to 10-7 for 1-mm-thick samples. A refractive-index increment in photothermorefractive glass of up to 5 × 10-6 was observed after UV exposure at 325 nm. A refractive-index decrement of up to 1 × 10-3 was observed after thermal development of the exposed sample. It was proved that photothermorefractive glass obeys the reciprocity law; i.e., Δn depends on the UV dosage but does not depend on the irradiance.This publication has 9 references indexed in Scilit:
- Phase-shifting shearing interferometerOptics Letters, 2001
- High-frequency Bragg gratings in a photothermorefractive glassOptics Letters, 2000
- High-efficiency Bragg gratings in photothermorefractive glassApplied Optics, 1999
- Radiation-induced wave-front aberrations: a new approachApplied Optics, 1998
- Glass matrix strain caused by photoinduced charging of point defectsJournal of Non-Crystalline Solids, 1991
- Formation of Bragg gratings in optical fibers by a transverse holographic methodOptics Letters, 1989
- Photosensitivity in optical fiber waveguides: Application to reflection filter fabricationApplied Physics Letters, 1978
- Spectra of formation of color centers in laser glassesSoviet Journal of Quantum Electronics, 1974
- The Use of a Single Plane Parallel Plate as a Lateral Shearing Interferometer with a Visible Gas Laser SourceApplied Optics, 1964