  We describe construction of an inexpensive Iodine Spectrometer with a home
made Iodine vapour cell and a self developed wavemeter based on Pohl
Interferometer, around 670 nm wavelength.This can be easily realised in an
undergraduate teaching laboratory to demonstrate use of a diode laser
interferometry using a Pohl interferometer and measurement of wavelength using
image processing techniques.Visible alternative to the IR diode lasers, 670 nm
diode laser used here give chance to undergraduate students to perform
comprehensive though illustrative atomic physics experiments including the
Zeeman effect, the Hanle effect, Magneto Optic Rotation (MOR) effect with a
little tweaking in the present spectrometer. The advantage of the spectrometer
is its ease of construction with readily available optics, electronics,
evacuation and glass blowing facilities and easy analysis algorithm to evaluate
the wavelength. The self developed algorithm of raster scanning and circular
averaging gives the researcher insight into the basics of image processing
techniques. Resolution approaching 0.5 nm can be easily achieved using such
simple setup.
