Wavemeter based on interferometer

This project aims to build a wavemeter which can be used to measure laser in our lab precisely.

Team: Qin Qichen, Zhao Qi, Zhang Zhao.

Aim

We aim to build a wavemeter which is used to measure laser in our lab. The range of wavelength our wavemeter can detect is around 1100nm - 1200nm, determined by optics. A precision around 100MHz is expected.

Theory

Michelson interferometer is a good tool to measure the length if there is a good laser. Similarly, it can also be used to measure wavelength. We use a 1550nm laser as our reference. By counting zeros in the signal, we can get the ratio between wavelengths.