Absolute distance measurement of rough surfaces using asynchronous optical sampling

Li, Wenliang; Qu, Xinghua; Zhao, Xianyu; Zhang, Fumin

doi:10.1117/1.oe.58.9.094101

Opt. Eng.

2019

DOI: 10.1117/1.oe.58.9.094101

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Absolute distance measurement of rough surfaces using asynchronous optical sampling

Wenliang Li

Xinghua Qu

Xianyu Zhao

et al.

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2021

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Cited by 2 publications

References 28 publications

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Correction of the air refractive index using a two-color method for absolute distance measurement without a dead zone

Gao

et al. 2021

Appl. Opt.

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In the fields of satellite formation, large-scale manufacturing, and ultra-precision machining, high-precision ranging based on the femtosecond laser is one of the necessary technologies. However, the fluctuations of the air refractive index and the limited tuning range of repetition rate restrict the measurement precision and range. Using only one femtosecond comb that corrects the air refractive index simultaneously, a method for ranging without the dead zone of measurement is described. A delay optical path is established in the ranging system to eliminate the dead zone of measurement by a comb. Meanwhile, in order to ensure the consistency of the pulse sequence between the fundamental frequency beam and the second-harmonic beam after the delay optical path, the second-harmonic beam generates on the delay optical path after the fundamental harmonic passes the long fiber. A two-color method is used to correct the effect of the air refractive index. The experimental result demonstrates the measurement precision of 7.2 µm at ∼ 0.8 m with correction of the air refractive index, and the precision of measurement is 8.4 µm at ∼ 2.2 m . Finally, the maximum deviation between our system and the reference standard is 5.0 µm.

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Correction of the air refractive index using a two-color method for absolute distance measurement without a dead zone

Gao

et al. 2021

Appl. Opt.

View full text Add to dashboard Cite

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Fast optical sampling by electronic repetition-rate tuning using a single mode-locked laser diode

Bajek

Cataluna

2021

Opt. Express

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This paper demonstrates optical sampling by electronic repetition-rate tuning (OSBERT): a single-laser optical sampling technique capable of fast scan rates and customisable scan ranges. The method has no moving parts and is based on the electronic modulation of the repetition rate of a passively mode-locked laser diode, simply by varying the reverse bias applied directly to the saturable absorber section of the laser. Varying the repetition rate in a system built as a highly imbalanced interferometer results in pairs of (pump, probe) pulses with successive increasing delay. The resulting scan range is proportional to the magnitude of the repetition rate modulation and is scaled by the chosen length of the imbalance. As a first proof of concept, we apply the method to distance measurement, where the displacement of a target across 13.0 mm was detected with ∼0.1 mm standard deviation from an equivalent free-space distance of 36 m and at a real-time scan rate of 1 kHz. The customizable scan range and competitive scan rate of the method paves the way for single ultrafast semiconductor laser diodes to be deployed as fast, low-cost, and compact optical sampling systems in metrology, biomedical microscopy, and sensing applications.

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Absolute distance measurement of rough surfaces using asynchronous optical sampling

Cited by 2 publications

References 28 publications

Correction of the air refractive index using a two-color method for absolute distance measurement without a dead zone

Correction of the air refractive index using a two-color method for absolute distance measurement without a dead zone

Fast optical sampling by electronic repetition-rate tuning using a single mode-locked laser diode

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