Spectra narrowing of high-power diode laser array based on Talbot external cavity

Many light emitting elements were periodically arranged in a high power diode laser array. Based on Talbot effect, the traditional Littrow external cavity narrow-linewidth system was improved. A Talbot external cavity was established by inserting a flat mirror with a reflection rate of 20% in the Littrow external cavity. The relative absorption coefficient was improved by 42.9% in rubidium pool absorption experiment, showing that the Talbot external cavity can improve output beam uniformity and pumping efficiency of the diode laser array.