Fourier Spectrometer based on a wide-range and nanometer stabilized Michelson Interferometer

A high signal-to-noise-ratio (SNR) and resolution Fourier spectrometer based on a wide-range and phase-locked Michelson interferometer is presented. A novel arrangement of a step motor, a nanometer resolution piezoelectric actuator and an active PID control loop ensures that the Michelson interferometer has a phase stabilized scanning range virtually without limit, resulting in the Fourier spectrometer´s high resolution and high SNR. Several experiments demonstrate that this spectrometer, using light sources such as write LED (WLED) and femtosecond laser, can accurately acquire the spectrum information of a given sample as well as the light source itself in a resolution of nanometer order.