Accurate wavelength measurement with Pohl interferometer through post detection processing

We present a simple wavemeter setup based on Pohl Interferometer to measure wavelength using post detection processing of data using a simple circular averaging algorithm. Advantage of the same is its portability, ease of use with CW as well pulsed lasers, speed at which we can measure the wavelength to a good enough accuracy and above all no requirement of a reference laser. Resolution approaching 0.5 nm can be easily achieved using such setup which can be further enhanced using a fiber coupler to couple the unknown wavelength in addition to advanced signal processing methods.