Abstract
We use the three-cornered-hat method to evaluate the absolute frequency stabilities of three different ultrastable reference cavities, one of which has a vibration-insensitive design that does not even require vibration isolation. An Nd:YAG laser and a diode laser are implemented as light sources. We observe approximately 1 Hz beat note linewidths between all three cavities. The measurement demonstrates that the vibration-insensitive cavity has a good frequency stability over the entire measurement time from 100 ms to 200 s. An absolute, correlation-removed Allan deviation of 1.4 x 10(-15) at s of this cavity is obtained, giving a frequency uncertainty of only 0.44 Hz.
Highlights
Ultra-narrow linewidth lasers play important roles in high precision metrology, such as highresolution spectroscopy, optical frequency standards, and fundamental tests of physics [1, 2, 3, 4]
Classical three-cornered-hat measurement When the three laser beams are stabilized to the respective cavities and the fiber noise compensation loops actively running, three cross beat frequencies are obtained at approximately 88 MHz, 304 MHz, and 392 MHz for cavity 1-2, 1-3, and 2-3, respectively
We have measured the absolute frequency stabilities of three laser beams independently locked to three ultrastable reference cavities, by using both a classical three-corneredhat method and a modified three-cornered-hat method, where two primary light sources are used to avoid common phase noise
Summary
Ultra-narrow linewidth lasers play important roles in high precision metrology, such as highresolution spectroscopy, optical frequency standards, and fundamental tests of physics [1, 2, 3, 4]. To achieve such a frequency stabilized local oscillator, the laser is typically servo locked to a vibration isolated, high-finesse cavity by using the Pound-Drever-Hall (PDH) technique [5]. Seismic vibrations can be transmitted to the cavity spacer via its structural support Such vibration leads to forces which deform the cavity and change its length. Some interesting works have already shown that the sensitivity of the cavity to the environmental mechanical disturbance can be minimized by optimizing cavity geometry and mounting method [7, 8, 9]
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