Introduction: Wholesale narrow linewidth diode laser modules keep spectral linewidth less than 0.1 nm and thermal drift in the vicinity of 0.01 nm/°C for stable, specific Procedure in variable environments.
given that https://www.reallightlaser.com/cw-qcw-lasers/08ltr-mini-single-mode-free-space-narrow-linewidth-diode-laser-components/