Journal
OPTICS EXPRESS
Volume 22, Issue 6, Pages 6597-6604Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.006597
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Funding
- Tsinghua University Initiative Scientific Research Program
- State Key Lab of Precision Measurement Technology & Instruments of Tsinghua University
- National Natural Science Foundation of China [61205147]
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A dual-comb nonlinear asynchronous optical sampling method is proposed to simplify determination of the time interval and extend the non-ambiguity range in absolute length measurements. Type II second harmonic generation facilitates curve fitting in determining the time interval between adjacent pulses. Meanwhile, the non-ambiguity range is extended by adjusting the repetition rate of the signal laser. The performance of the proposed method is compared with a heterodyne interferometer. Results show that the system achieves a maximum residual of 100.6 nm and an uncertainty of 1.48 mu m in a 0.5 ms acquisition time. With longer acquisition time, the uncertainty can be reduced to 166.6 nm for 50 ms and 82.9 nm for 500 ms. Moreover, the extension of the non-ambiguity range is demonstrated by measuring an absolute distance beyond the inherent range determined by the fixed repetition rate. (C) 2014 Optical Society of America
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