Do you feel pain when you align your laser beams with respect to a free-space scanning Fabry-Perot interferometer? 

Do you get frustrated by a weird or wrong laser spectral profile caused by a misalignment error of your free-space scanning Fabry-Perot interferometer, or by misalignment between your laser beam and the Fabry-Perot interferometer? 

Do you get fooled by multiple spectral peaks appearing in scanning Fabry-Perot spectrum over one FSR (free spectral range) even with your lasers even perfectly in a single-frequency operation mode? 

Do you want to truly see whether there is any mode-hop issue or any multi-mode issue with your external cavity diode lasers when you tune the lasers? 

Are you eager for a low-cost tool, enabling precisely monitoring your laser wavelength scanning around an atomic transition line for on-resonant excitation or far-off-resonant excitation by a well-defined frequency detuning, or precisely monitoring frequency offsets between multiple laser beams that access to different electronic transitions of atoms?  

Do you want to have a low-cost solution to mutually lock multiple lasers together at a precision level as high as MHz or even sub-MHz, whose wavelengths have a quite large offset (from a few pm to 100 nm)? 

A fiber-based Fabry-Perot interferometer provides a low-cost solution to address all the issues/pains associated with using a free-space Fabry-Perot interferometer. TuSense Tech’s FFPI-1-1 Model is a single-mode fiber Fabry-Perot interferometer with a free-spectral range (FSR) of 1GHz and finesse of >500, offering a spectral resolution as high as <2MHz over a wide spectral range (600nm ~ 900nm) – a popular spectral region of particular importance to trapping and cooling experiments for most atomic species. This Application Note describes how you could benefit from a fiber-based scanning Fabry-Perot interferometer for your atomic trapping and cooling experiments.