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Subhertz linewidth diode lasers by stabilization to vibrationally and thermally compensated ultralow-expansion glass Fabry-Pérot cavities
We achieved a 0.5 Hz optical beat note linewidth with $\ensuremath{\sim}0.1\text{ }\text{Hz}/\text{s}$ frequency drift at 972 nm between two external cavity diode lasers independently stabilized to two vertically mounted Fabry-P\'erot (FP) reference cavities with a finesse of 400 000. Vertical FP reference cavities are suspended in midplane such that the …