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A precisely controllable positioning stage based on an optical-zooming interferometer using two diode lasers locked to a fs-comb was developed. The nonlinearity error of positioning was 0.6 nm and control resolution was 20 pm.
We propose a laser-frequency-based scale free from dispersive effects using a widely tunable laser and an optical frequency comb generator. We achieved displacement ranges up to 10 um with 220 pm uncertainty for measurement periods of 600 s.
We describe the fabrication of a novel type of saturable absorber mirrors based on polymer embedded carbon nanotubes and we demonstrate their performance in mode-locking an Er/Yb:glass laser: 68 fs (45fs Fourier limit) at 85 MHz repetition-rate.
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