Cavity-mode wavelengths in air are determined by measuring a laser's frequency while it is locked to the mode in vacuum during a calibration step and subsequently correcting the mode wavelength for atmospheric pressure compression, temperature difference, and material aging. Using a Zerodur ring cavity, we demonstrate a repeatability of +-2 X 10~(-8) (3sigma), with the wavelength accuracy limited to +-4 X 10~(-8) by knowledge of the absolute helium gas temperature during the pressure calibration. Mirror cleaning perturbed the mode frequency by less than (DELTA)v/v approx 3 X 10~(-9), limited by temperature correction residuals.
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机译:空气中的腔模式波长是通过在校准步骤中将激光锁定在真空模式下时测量激光的频率并随后针对大气压力压缩,温度差和材料老化来校正模式波长来确定的。使用Zerodur环形腔,我们通过了解氦气在绝对温度下的温度,证明了+ -2 X 10〜(-8)(3sigma)的可重复性,其波长精度限于+ -4 X 10〜(-8)。压力校准。镜面清洁将模式频率扰动小于Δv/ v约3 X 10〜(-9),受温度校正残差的限制。
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