birefringence


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Related to birefringence: circular birefringence

birefringence

 [bi″re-frin´jens]
the quality of transmitting light unequally in different directions.

dou·ble re·frac·tion

the property of having more than one refractive index according to the direction of the transmitted light.
Synonym(s): birefringence

birefringence

An optical property of materials in which the refractive index differs for light polarised in 1 plane compared to the normal (orthogonal) plane. Crossed Nicoll prisms cause birefringent material to appear bright against a dark background.

Birefringence types 
Form birefringence—due to differences in molecular organisation of a material.

Stress birefringence—due to tension-related differences in molecular alignment.
 
Flow birefringence—due to differences in alignment of rod-like particles in fluids.

dou·ble re·frac·tion

(dŭb'ĕl rĕ-frak'shŭn)
The property of having more than one refractive index according to the direction of the transmitted light.
Synonym(s): birefringence.

birefringence

Splitting of light into two separate beams.

birefringence 

Property of anisotropic media such as crystals, whereby an incident light beam is split up into two beams, each plane polarized at right angles to the other. One beam, called ordinary, obeys Snell's law, while the other, called extraordinary, does not. Syn. double refraction. See anisotropic; law of refraction; Nicol prism; Wollaston prism.
References in periodicals archive ?
When attempting to distinguish PLA from the other generic fiber types commonly encountered in forensic casework, most fiber types can be eliminated by polarized light microscope examination of relative refractive index and birefringence. However, two generic fiber types, rayon and olefin, have similar birefringence values to PLA (Identification of Textile Materials 1975; McCrone et al.
While engineers had long observed birefringence in crystals under pressure or tension, no one in industry considered the possibility of intrinsic birefringence as a manufacturing issue, Burnett says.
Morphologically, the pseudogout lesions may resemble gout and other conditions, such as tumoral calcinosis.[5-7] Pseudogout crystals demonstrate diagnostic weak positive birefringence with polarizing microscopy in sections stained with the Shidham method.
Windows are made from a special optical flat tempered glass that did not develop any thermal birefringence thus all the birefringences being measured is coming from the sample alone.
In addition, panels C and D also indicate the measured inclination and orientation angle of the birefringence axis, which also indicates the orientation of the astral microtubules.
During the neck deformation of the as-spun PTT fiber, the refractive index increases in the direction parallel to the fiber axis and decreases along the perpendicular direction, which leads to an increase in the birefringence. However, as the draw ratio increases, the refractive indices both parallel and perpendicular to the fiber axis show increasing trends, and the birefringence decreases with increasing draw ratio.
Immediately after fertilization, the negative birefringence disappears from the membranes stacked in the upper half of the clear zone of the stratified eggs (Fig.
NIST researchers are pursuing potential solutions to the problem involving mixed crystals to compensate for the birefringence effect.
(42) True stress, true strain and birefringence development of orientation in rubbers during uniaxial stretching as detected by spectral birefringence technique: II.
This too will produce an interference effect, and if something changes the birefringence -- as a number of physical effects will -- the interference will change.
We will consider the acoustic birefringence with ultrasonic detection and its application in slightly anisotropic polymers for residual stress characterization.
RI values varied along the length of the faceted stone: at the darker end they were 1.617 and 1.638 (birefringence 0.021), while the lighter end gave readings of 1.610 and 1.630 (birefringence 0.020).