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Technical data


Polarisation by strain double refraction (birefringence)

Article no: P1196900

Principle

During the manufacturing process, by subsequent treatment or the exertion of external forces it is possible to induce tensions in transparent materials, which bring about optical anisotropy of those materials. This means that a Iight wave train is split up into two parts with different oscillation planes when it passes through these materials. The propagation velocity of the Iight and hence the diffraction index are dependent on the direction of travel. This phenomenon is known as stress birefringence or photoelasticity.

In this experiment the students should realize that when polarized white Iight passes through optically anisotropic materials, coloured bright areas appear behind the crossed analyzer, and these are apparently brought about because the oscillation planes of parts of the emergent light are altered.

Benefits

  • Multifunctional light box - All-in-one: Can be used for geometric optics on the table, colour mixing and on an optical bench
  • Extension with others sets at anytime, no additional light sources needed, recognition value for students

Tasks

  1. Direct polarized Iight through given photoelastic models, exerting on these at the same time various pressures which bring about inner tensions, and analyze the emergent light.
  2. Then investigate whether spectacle lenses display inner tensions.

Scope of delivery

Light box, halogen 12V/20 W 09801-00 1
Bottom with stem for light box 09802-20 1
Optical profile-bench for student experiments, l = 600 mm 08376-00 1
Lens on slide mount, f=+50mm 09820-01 1
Lens on slide mount, f=+100mm 09820-02 1
Mount with scale on slide mount 09823-00 1
Screen, white, 150x150 mm 09826-00 1
Photoelastic model 09829-00 1
Polarization filter, 50 mm x 50mm 08613-00 2
Diaphragm holder, attachable 11604-09 2
PHYWE Power supply, 230 V, DC: 0...12 V, 2 A / AC: 6 V, 12 V, 5 A 13506-93 1
Slide mount for optical bench 09822-00 1

PHYWE Systeme GmbH & Co. KG
Robert-Bosch-Breite 10 – 37079 Göttingen – Germany
www.phywe.com