Absolute Distance Measurement by Dual-comb Nonlinear Asynchronous Optical Sampling
LI Yan,ZHANG Hong-yuan
State Key Laboratory of Precision Measurement Technology & Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
Abstract 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 μm 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.
［1］Hyun S, Kim Y J, Kim Y, et al. Absolute length measurement with the frequency comb of a femtosecond laser［J］. Measurement Science and Technology, 2009, 20(9): 095302. ［
2］Wu X, Wei H, Zhang H, et al. Absolute distance measurement using frequency-sweeping heterodyne interferometer calibrated by an optical frequency comb［J］. Applied optics, 2013, 52(10): 2042-2048.
［3］Minoshima K, Matsumoto H. High-accuracy measurement of 240 m distance in an optical tunnel by use of a compact femtosecond laser［J］. Applied Optics, 2000, 39(30): 5512-5517.
［4］Ye J. Absolute measurement of a long, arbitrary distance to less than an optical fringe［J］. Optics letters, 2004, 29(10): 1153-1155.
［5］Cui M, Zeitouny M G, Bhattacharya N, et al. High-accuracy long-distance measurements in air with a frequency comb laser［J］. Optics letters, 2009, 34(13): 1982-1984.
［6］Wei D, Takahashi S, Takamasu K, et al. Experimental observation of pulse trains' destructive interference with a femtosecond optical frequency-comb-based interferometer［J］. Optics letters, 2009, 34(18): 2775-2777.
［7］Wei D, Takahashi S, Takamasu K, et al. Time-of-flight method using multiple pulse train interference as a time recorder［J］. Optics express, 2011, 19(6): 4881-4889.
［8］Balling P, Krˇen P, Maika P, et al. Femtosecond frequency comb based distance measurement in air［J］. Optics express, 2009, 17(11): 9300-9313.
［9］Lee J, Kim Y J, Lee K, et al. Time-of-flight measurement with femtosecond light pulses［J］. Nature photonics, 2010, 4(10): 716-720.
［10］Coddington I, Swann W C, Nenadovic L, et al. Rapid and precise absolute distance measurements at long range［J］. Nature Photonics, 2009, 3(6): 351-356.
［11］Lee J, Han S, Lee K, et al. Absolute distance measurement by dual-comb interferometry with adjustable synthetic wavelength［J］. Measurement Science and Technology, 2013, 24(4): 045201.
［12］Joo K N, Kim S W. Absolute distance measurement by dispersive interferometry using a femtosecond pulse laser［J］. Optics express, 2006, 14(13): 5954-5960.
［13］Van den Berg S A, Persijn S T, Kok G J P, et al. Many-wavelength interferometry with thousands of lasers for absolute distance measurement［J］. Physical review letters, 2012, 108(18): 183901.
［14］Liu T A, Newbury N R, Coddington I. Sub-micron absolute distance measurements in sub-millisecond times with dual free-running femtosecond Er fiber-lasers［J］. Optics express, 2011, 19(19): 18501-18509.
［15］Kafka J D, Pieterse J W, Watts M L. Two-color subpicosecond optical sampling technique［J］. Optics letters, 1992, 17(18): 1286-1288.
［16］Janke C, Frst M, Nagel M, et al. Asynchronous optical sampling for high-speed characterization of integrated resonant terahertz sensors［J］. Optics letters, 2005, 30(11): 1405-1407.
［17］Maier M, Kaiser W, Giordmaine J A. Intense light bursts in the stimulated Raman effect［J］. Physical review letters, 1966, 17(26): 1275.
［18］Zhang H, Wei H, Wu X, et al, Absolute distance measurement by dual-comb nonlinear asynchronous optical sampling［J］.Optics Express,2014, 22（6）:6597-6604.
2014, Vol. 35 
