8  ×  10⁻¹⁷ fractional laser frequency instability with a long room-temperature cavity

Abstract

We present a laser system based on a 48 cm long optical glass resonator. The large size requires a sophisticated thermal control and optimized mounting design. A self-balancing mounting was essential to reliably reach sensitivities to acceleration of below $\mathrm{\Delta }\nu /\nu <2\times {10}^{-10}/\mathrm{g}$ in all directions. Furthermore, fiber noise cancellations from a common reference point near the laser diode to the cavity mirror and to additional user points (Sr clock and frequency comb) are implemented. Through comparison with other cavity-stabilized lasers and with a strontium lattice clock, instability of below $1\times {10}^{-16}$ at averaging times from 1 to 1000 s is revealed.

© 2015 Optical Society of America

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