Demonstrating the Pockels effect in a conoscopic beam path

VP5.4.5.1
Demonstrating the Pockels effect in a conoscopic beam path
Demonstrating the Pockels effect in a conoscopic beam path Interference pattern in the conoscopic beam path (P5.4.5.1)
Demonstrating the Pockels effect in a conoscopic beam path

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Description

The experiment P5.4.5.1 demonstrates the Pockels effect in a lithium niobate crystal placed in a conoscopic beam path. The crystal is illuminated with a divergent, linearly polarized light beam, and the transmitted light is viewed behind a perpendicular analyzer. The optical axis of the crystal, which is birefringent even when no electric field is applied, is parallel to the incident and exit surfaces; as a result, the interference pattern consists of two sets of hyperbolas which are rotated 90° with respect to each other. The bright lines of the interference pattern are due to light rays for which the difference Δ between the optical paths of the extraordinary and ordinary rays is an integral multiple of the wavelength λ. The Pockels effect alters the difference of the main refractive indices, no - ne, and consequently the position of the interference lines. When the so-called half-wave voltage Uλ is applied, Δ changes by one half wavelength. The dark interference lines move to the position of the bright lines, and vice versa. The process is repeated each time the voltage is increased by Uλ.

Components of equipment sets

1 47290 Pockels cell LD
1 52170 High-voltage power supply, 10 kV LD
1 471830  4  He-Ne Laser, linearly polarised LD
1 46001  8  Lens in frame, f=5 mm LD
1 46002  8  Lens in frame, f=50 mm LD
1 472401  8  Polarisation filter LD
1 46032  8  Optical bench with standardised profile, 1 m LD
5 460370  8  Optics rider, 60/34 LD
1 44153  8  Screen, translucent LD
1 30011  4  Saddle base LD
1 500604  4  Safety connecting lead, 10 cm, black LD
1 500641  4  Safety connecting lead, 100 cm, red LD
1 500642  4  Safety connecting lead, 100 cm, blue LD

Experiment Instructions

PDF (Experiment description) PDF (Experiment description) P5.4.5.1 Demonstrating the Pockels effect in a conoscopic beam path
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