Topic
Birefringence
About: Birefringence is a research topic. Over the lifetime, 23586 publications have been published within this topic receiving 363407 citations.
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TL;DR: This study provides a feasible way to break down the DUV wall for NLO materials by introducing the (BO3 F)4- , (BO2 F2 )3- , and (BOF3 )2- groups in borates to break through the fixed 3D B-O network that would produce a larger birefringence without layering and simultaneously keep a short cutoff edge down to DUV.
Abstract: Deep-ultraviolet nonlinear optical (DUV NLO) crystals are the key materials to extend the output range of solid-state lasers to below 200 nm. The only practical material KBe2BO3F2 suffers high toxicity through beryllium and strong layered growth. Herein, we propose a beryllium-free material design and synthesis strategy for DUV NLO materials. Introducing the (BO3F)(4-),(BO2F2)(3-), and (BOF3)(2-) groups in borates could break through the fixed 3DB-O network that would produce a larger birefringence without layering and simultaneously keep a short cutoff edge down to DUV. The theoretical and experimental studies on a series of fluorooxoborates confirm this strategy. Li2B6O9F2 is identified as aDUV NLO material with a large second harmonic generation efficiency (0.9 x KDP) and a large predicted birefringence (0.07) without layering. This study provides a feasible way to break down the DUV wall for NLO materials.
581 citations
TL;DR: KxRb1−xTiOPO4, a nonlinear optical material with coefficients comparable to BaNa2Nb5O15, has been prepared as optically perfect single crystals which are transparent from 350 to 4500 nm.
Abstract: KxRb1−xTiOPO4, a new nonlinear optical material with coefficients comparable to BaNa2Nb5O15, has been prepared as optically perfect single crystals which are transparent from 350 to 4500 nm. We have shown that the material is phase matchable over its entire transparency range and that 1060‐nm radiation can be doubled with minimal beam walk‐off. The material is free from optical damage for power densities at least as large as 150 MW/cm2. Also, it is chemically stable and easily polished.
580 citations
TL;DR: In this article, the refractive indices of ZnGeP2, point group 42m, have been determined from 0.64 to 12 μ and the nonlinear optical coefficient d14 for second harmonic generation (SHG) measured relative to d14 of GaAs is 0.83 ± 15%.
Abstract: The refractive indices of ZnGeP2, point group 42m, have been determined from 0.64 to 12 μ. ZnGeP2 has positive birefringence with reasonable temperature tunability and a band gap in the visible. Its nonlinear optical coefficient d14 for second harmonic generation (SHG) measured relative to d14 of GaAs is 0.83 ± 15%. The birefringence of ZnGeP2 is not large enough to allow phase‐matched SHG, but nondegenerate phase‐matched three‐frequency mixing is possible and the parametric oscillator threshold power is calculated for several situations. A redetermination of the coefficient d31 in CdSe is made and the materials compared. It is concluded that ZnGeP2 may be a most promising material for parametric generation in the 0.8– to 12‐μ region.
574 citations
TL;DR: It is shown that one can in principle generate fields of any integral order P by cascading such elements and devices that generate P = 1 fields are achromatic and can be used as polarization axis finders or as versatile tools for studying birefringent or polarizing materials.
Abstract: Novel liquid-crystal devices are described that generate linearly polarized light with axial symmetry; the beam propagation axis is the symmetry axis. Such light fields can be characterized by a polarization order number P. For example, P = 1 fields represent radially or azimuthally polarized light. The reorientation of the polarization orientation in these polarization converters is due to the twisted nematic effect and the effect of lambda/2 wave plates. A single polarization converter can generate fields of orders 1 and 2. It is shown that one can in principle generate fields of any integral order P by cascading such elements. Devices that generate P = 1 fields are achromatic and can be used as polarization axis finders or as versatile tools for studying birefringent or polarizing materials.
573 citations
TL;DR: In a bent optical fiber, lateral internal stress induces a birefringence, betab, where r is the fiber radius and R is the bending radius.
Abstract: In a bent optical fiber, lateral internal stress induces a birefringence, betab. At lambda = 0.633 microm in a silica fiber, betab = 7.7 X 10(7) r2 /R2 deg/m, where r is the fiber radius and R is the bending radius.
543 citations