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We present a method to measure precisely absolute distance between mirrors of Fabry-Perot cavity (FPC) with a spacer from an ultra low expansion material based on ultra wide tunable laser diode. The laser diode works at 1542 nm with 1 MHz linewidth and 2 nm tunable range. First results with noise suppression was carried out with 3 kHz linewidth laser has been suppressed by −60 dBc/Hz at 10 kHz by...
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