High precision laser ranging by time-of-flight measurement of femtosecond pulses

Lee, Joohyung; Lee, Keun-Woo; Lee, Sang‐Hyun; Kim, Seungwoo; Kim, Young‐Jin

doi:10.1088/0957-0233/23/6/065203

Cited by 52 publications

(34 citation statements)

References 43 publications

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“…A few experiments were conducted to corroborate Ye's method with precision comparable to theoretical predictions [11][12][13][14]. Furthermore, an incoherent scheme, named as balanced cross-correlation [15,16], was also put forward merely using time-of-flight principle with a compact design. However, the second approach only worked at discrete ranges required by pulses overlap.…”

Section: Introductionmentioning

confidence: 81%

Absolute distance measurement by dual-comb nonlinear asynchronous optical sampling

Zhang¹,

Wei²,

Wu³

et al. 2014

Opt. Express

118

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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 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.

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Section: Introductionmentioning

confidence: 81%

Absolute distance measurement by dual-comb nonlinear asynchronous optical sampling

Zhang¹,

Wei²,

Wu³

et al. 2014

Opt. Express

118

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“…Figure 3d illustrates a different technique called the balanced intensity cross-correlation in which a nonlinear optical crystal (periodically poled lithium niobate; PPLN) is adopted to convert the pulse timing difference to a radio-frequency signal by means of balanced subtraction of two second-harmonic optical signals generated by the PPLN crystal. In addition to effective suppression of optical and electrical noise, the balanced cross-correlation technique provides a fast update rate over several kHz with a sub-micrometer precision, which was demonstrated over a long distance of 700 m while maintaining the direct traceability to the atomic clock [13,14]. Figure 4 describes experimental setup of frequency-comb-referenced multi-wavelength interferometry.…”

Section: Femtosecond Pulse Lasermentioning

confidence: 99%

“…First of all, the frequency comb of a femtosecond laser allows the wavelength of the continuous-wave laser used for distance measurement to be calibrated precisely with direct traceability to the welldefined atomic clock of frequency standard [3][4][5][6]. In addition, the femtosecond laser itself can be used as a light source directly for distance measurements as demonstrated in the synthetic radio-frequency wavelength interferometer [7,8], Fourier-transform-based dispersive interferometer [9,10], multi-heterodyne interferometer using a pair of femtosecond lasers of different pulse repetition rates [11,12] and incoherent time-of-flight (TOF) measurement using balanced optical detection [13,14]. These newly established techniques share the aim of achieving sub-wavelength precision at long ranges for high-precision ADM applications by exploiting the unique temporal and spectral characteristics of ultrashort light pulses which are absent in conventional lasers.…”

Section: Introductionmentioning

confidence: 99%

Recent advances in absolute distance measurements using femtosecond light pulses

Kim

Hyun

et al. 2015

Ninth International Symposium on Precision Engineering Measurement and Instrumentation

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Absolute distance measurement (ADM) with high precision is required for various fields of precision engineering, which has long been implemented by means of time-of-flight measurement of a pulsed laser, intensity or frequency modulation of a continuous-wave laser, and cross-correlation of pseudo-random micro-wave signals. Recently, in response to increasing demands on the measurement precision and range beyond conventional limits, femtosecond pulse lasers began to draw attention as a new light source that permits realizing various advanced ADM principles such as synthetic radiofrequency wavelength generation, Fourier-transform-based dispersive analysis and multi-wavelength interferometry. In this talk, we present the state-of-the-art measurement principles and performance demonstrated by exploiting the unique temporal and spectral characteristics of femtosecond laser pulses for high-precision ADM applications.

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“…In recent years, in order to meet evergrowing industrial demands on the measurement precision and functionality, quit a few attempts have been made worldwide. Examples include synthetic wavelength interferometry [43][44][45], multi-wavelength interferometry [46][47][48][49][50], spectrally resolved interferometry [51][52][53][54], timeof-flight measurement [55][56][57][58][59] and dual-comb interferometry [60][61][62][63][64].…”

Section: Introductionmentioning

confidence: 99%

Distance Measurements Using Mode-Locked Lasers: A Review

Jang

Kim

2018

Nanomanuf Metrol

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We present a progress review on the advance of distance measurements made at KAIST by making use of mode-locked lasers as the light source to meet ever-growing industrial demands on the measurement precision and functionality. Diverse principles exploited for the progress are described in this review with focus on four attributes: first, the optical spectrum of a mode-locked laser, distinctively called the frequency comb, permits multi-wavelength interferometry to be realized for absolute distance measurement up to several meters without losing the nanometer precision of well-established laser-based phase-measuring displacement measurement. Second, the frequency comb enables spectrally resolved interferometry for absolute distance measurement to be conducted with a nanometer resolution by Fourier transform analysis of the dispersive interference data captured using a spectrometer. Third, the mode-locked laser in the time domain appears as a train of ultrashort pulses, of which the time-of-flight is measured with a picosecond resolution by control of the pulse repetition rate with reference to the radio-frequency atomic clock. Fourth, the pulse-to-pulse cross-correlation occurring in the optical frequency domain is down-converted to the radio-frequency domain to achieve femtosecond pulse timing precision by means of dual-comb interference. All these principles based on unique spectral and temporal characteristics of ultrashort mode-locked lasers are anticipated to make contributions to the advance of nanotechnology particularly in manufacturing and metrology.

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High precision laser ranging by time-of-flight measurement of femtosecond pulses

Cited by 52 publications

References 43 publications

Absolute distance measurement by dual-comb nonlinear asynchronous optical sampling

Absolute distance measurement by dual-comb nonlinear asynchronous optical sampling

Recent advances in absolute distance measurements using femtosecond light pulses

Distance Measurements Using Mode-Locked Lasers: A Review

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