Context
Blue laser diodes (405-460 nm) usually have a multimode spectrum. The use of an external cavity favors monomode behavior and, depending on the cavity finesse, allows to reduce the natural linewidth of the laser. As an example, a cavity based on diffraction grating downsizes the linewidth to a few kHz. Nevertheless, various ‘low frequency’ noises contribute to increase the laser linewidth to a few MHz for integration time of the order of the second.
Goals
Single Blue project aims to reduce the ‘low frequency’ noise of blue laser diodes for linewidth narrowing and stabilization. Two servo loops will be studied: a pre-stabilization scheme based on an optical cavity and long term stabilization realized by locking the laser on an atomic transition. The final goal is to transfer the skills on laser stabilization to the laser company Oxxius which is interested in compact embeddable and low cost blue EDCL lasers with kHz linewidth over 1 second integration time
Stages
Continuity of the project Deep Blue which ended in 2018
Partners
Coordinator
Stéphane TREBAOL (Foton-SP)