Laser diode self-mixing interferometry for velocity measurements

Alexandrova, Alexandra; Tzoganis, Vasilis; Welsch, Carsten

doi:10.1117/1.oe.54.3.034104

Cited by 25 publications

(8 citation statements)

References 37 publications

(42 reference statements)

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“…This is essential to resolve the systematic errors due to gas inhomogeneity and the resolution of the monitor. Tests are also being carried out on a novel quasioptical focusing system which would allow the generation of ultrathin jets with a diameter of a few tens of microns [44], as well as on a laser-based velocity meter [45] for jet characterization.…”

Section: Small Skimmer (4×04mm 2 )mentioning

confidence: 99%

Design and first operation of a supersonic gas jet based beam profile monitor

Tzoganis

Zhang

Jeff

et al. 2017

Phys. Rev. Accel. Beams

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Noninterceptive beam profile monitors are of great importance for many particle accelerators worldwide. Extra challenges are posed by high energy, high intensity machines and low energy low intensity accelerators. For these applications, existing diagnostics are no longer suitable due to the high power of the beam or the very low intensity. In addition, many other accelerators, from medical to industrial will benefit from a noninvasive, real time beam profile monitor. In this paper we present a new beam profile monitor with a novel design for the nozzle and skimmer configuration to generate a supersonic gas jet meeting ultrahigh vacuum conditions and we describe the first results for such a beam profile monitor at the Cockcroft Institute. This monitor is able to measure two-dimensional profiles of the particle beam while causing negligible disturbance to the beam or to the accelerator vacuum. The ultimate goal for this diagnostic is to provide a versatile and universal beam profile monitor suitable for measuring any beams.

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Section: Small Skimmer (4×04mm 2 )mentioning

confidence: 99%

Design and first operation of a supersonic gas jet based beam profile monitor

Tzoganis

Zhang

Jeff

et al. 2017

Phys. Rev. Accel. Beams

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“…Compared with the two-beam interference, laser feedback has the advantages of self-alignment, compactness and low cost. Thus, the feedback has been widely used for displacement measurement [2], vibrometry [3], velocity measurement [4], absolute distance [5], anisotropy measurement [6], and microscopy [7].…”

Section: Introductionmentioning

confidence: 99%

Laser multiple optical feedback with misalignment cavity and its sensing application

Zeng

Bai²,

Tian³

et al. 2022

5th Optics Young Scientist Summit (OYSS 2022)

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The intensity and frequency properties of laser multiple optical feedback have been investigated. The multiple optical feedback is realized with a high reflectivity feedback mirror in the misalignment external cavity. Experimental results show that the laser intensity is modulated by the variation of feedback cavity length, when the feedback mirror is drove by PZT. In most cases, the modulation depth of the multiple feedback fringes is obviously different. And its frequency analysis results seem like the noise signals. Particularly, at certain misalignment angle of feedback mirror, the envelope of feedback fringes is cosine-like and the modulation depth of the multiple feedback fringes is almost equal. The spectral analysis shows that the fringes density of multiple feedback is increased evidently than that of conventional weak feedback. The resolution of this fringe is upto nanometer level which can be calculated by the spectral analysis result. This high resolution cosine-like fringe of multiple feedback is very useful for high precision sensing applications.

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“…Self-mixing interference (SMI) is attractive for optical measurements in many fields, such as structural analysis [1], micro-damping vibration [2], [3], [4], motor runout [5], [6], [7], and medical diagnosis [8], [9], [10], [11], due to its inherent simplicity, compactness, and self-alignment [12]. Microscale vibration information can be easily obtained by using the SMI effect.…”

Section: Introductionmentioning

confidence: 99%