Introduction: Wholesale slender linewidth diode laser modules keep spectral linewidth under 0.1 nm and thermal drift close to 0.01 nm/°C for steady, precise operation in variable environments.
since the chill of https://www.reallightlaser.com/cw-qcw-lasers/08ltr-mini-single-mode-free-space-narrow-linewidth-diode-laser-components/