8 × 10⁻¹⁷ fractional laser frequency instability with a long room-temperature cavity.
2015
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 Δν/ν<2×10−10/g in all directions. Furthermore, fiber noise cancellations from a common
reference pointnear 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 1×10−16 at averaging times from 1 to 1000 s is revealed.
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