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Technical data


Diffraction intensity due to pin holes and circular obstacles

Article no: P2230301

Principle

Pin hole diaphragms and circular obstacles are illuminated with laser light. The resulting intensity distributions due to diffraction are measured by means of a photo diode.

Tasks

  1. The complete intensity distribution of the diffraction pattern of a pin hole diaphragm (D1 = 0.25 mm) is determined by means of a sliding photo diode. The diffraction peak intensities are compared with the theoretical values. The diameter of the pin hole diaphragm is determined from the diffraction angles of peaks and minima.
  2. The positions and intensities of minima and peaks of a second pin hole diaphragm (D2 = 0.5 mm) are determined. The diffraction peak intensities are compared with the theoretical values. The diameter of the pin hole diaphragm is determined.
  3. The positions of minima and peaks of the diffraction patterns of two complementary circular obstacles (D*1 = 0.25 mm and D*2 = 0.5 mm) are determined. Results are discussed in terms of Babinet's Theorem.

Learning objectives

  • Huyghens principle
  • Interference
  • Fraunhofer and Fresnel-diffraction
  • Fresnel's zone construction
  • Coherence
  • Laser
  • Airy disk
  • Airy ring
  • Poissonâ's spot
  • Babinet's theorem
  • Bessel functions
  • Resolution of optical instruments

Scope of delivery

Diode pumped solid state laser, green, 1 mW, 532 nm 08765-99 1
Digital array camera 35612-99 1
Adapter, BNC male/4 mm female pair 07542-26 1
Optical bench expert, l = 1500 mm 08281-00 1
Base for optical bench expert, adjustable 08284-00 2
Slide mount for optical bench expert, h = 30 mm 08286-01 3
Universal Holder, rotational 08040-02 1
Screen, metal, 300 x 300 mm 08062-00 1
Screen, with diffracting elements 08577-02 1
PHYWE Digital multimeter, 600V AC/DC, 10A AC/DC, 20 MΩ, 200 µF, 20 kHz, −20°C…760°C 07122-00 1
Connecting cable, 32 A, red, various lengths 07362-01 1
Connecting cable, 32 A, blue, various lengths 07362-04 1

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