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We describe construction of an inexpensive Iodine Spectrometer with a homemade Iodine vapour cell and a self developed wavemeter based on PohlInterferometer, around 670 nm wavelength.This can be easily realised in anundergraduate teaching laboratory to demonstrate use of a diode laserinterferometry using a Pohl interferometer and measurement of wavelength usingimage processing techniques.Visible alternative to the IR diode lasers, 670 nmdiode laser used here give chance to undergraduate students to performcomprehensive though illustrative atomic physics experiments including theZeeman effect, the Hanle effect, Magneto Optic Rotation (MOR) effect with alittle tweaking in the present spectrometer. The advantage of the spectrometeris its ease of construction with readily available optics, electronics,evacuation and glass blowing facilities and easy analysis algorithm to evaluatethe wavelength. The self developed algorithm of raster scanning and circularaveraging gives the researcher insight into the basics of image processingtechniques. Resolution approaching 0.5 nm can be easily achieved using suchsimple setup.

Construction of an inexpensive molecular Iodine spectrometer using a self developed Pohl wavemeter around 670 nm wavelength