He-Ne laser with Imported Slides

Item Code: SK038

Working and Principle :

Diffraction phenomenon of light cab be observed when a laser beam passes through a slit or grating. The diffraction pattern can be observed on a translucent screen.

In the present setup single slit, double slit, multiple slit, single tapered slit, fine grating, holes, circular opaque spot, gray filter, mesh and coarse grating are used for diffraction experiments with a he-ne laser.




  • All individually slides are protected by two glass plates in frame
  • He-Ne laser with in-built power supply.
  • Saddle can hold rod from 8 to 15mm.
  • Heavy, rigid and stable Triangular Optical bench (made of Al extrusion).
  • Height and level adjustment screws (made of SS)

  • To demonstrate that light spreads when it passes through a narrow aperture.
  • To observe the diffraction patterns by holes, single slit and double slit, mesh, grating, grid, opaque spots.
  • To demonstrate Young’s fringes.
  • To demonstrate Fresnel’s diffraction.
  • To measure wavelength of light using a millimeter scale as grating.
  • To demonstrate fringes of equal inclination.
  • Optical bench : Al exclusion, L = 1m, Triangular shape with end stop, 4 point levelling (SS screw)
  • Transversal slider : 25 – 0 – 25mm, LC 0.01mm,
  • Screen : Acrylic(translucent) 300 x 300 x 3mm
  • Laser : He-Ne Laser (632mm), Power 2 mW, Beam spot 2.5mm, current 4mA ~ 6mA, Dimension 300 x 62 x 82mm.

    • Diffraction slides SL744


  • Slit Frame Size : 50mm x 50mm, Width=0.06mm & Separation=0.20mm (Single, Double, Three, Four, Five, & Six) Single & Double slit Tapered
  • Coarse Grating : 4 & 8 lines/mm, line/space ratio 3:1 & 6:1
  • Diffraction grating : 80 lines / mm, 300 lines / mm
  • Circular apertures : 1.0, 0.60, 1.40, 0.30 mm nominal dia.
  • Hologram : 50 x 50mm Transmission type
  • Polaroids : 50 x 50mm linearly polarized
  • 1 He-Ne laser
  • 1 Optical bench triangular
  • 1 Screen (30 x 30 cm) with cylindrical base
  • 1 Diffraction slides (Imported)
  • 1 Slit holder
  • 1 Measuring tape (3m)
  • 1 Metal scale (15 cm)
  • 1 -10cm concave lens
  • 1 -5cm concave lens
  • 1 +10cm convex lens
  • 1 +20cm convex lens
  • 1 Prism table
  • 3 Fixed slider
  • 1 Transversal slider
  • 1 Fixed slider (large width)