High-accuracy measurement of air refractive index using two frequency-doubling crystals

Matsumoto, Hirokazu; Zeng, Lijiang

doi:10.1016/0030-4018(94)90549-5

Cited by 13 publications

(2 citation statements)

References 8 publications

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“…3,8 The acquisition and processing time for each pixel is ϳ3 s. Related phase techniques have been used to measure the dispersion property of metals 9 and the refractive index of air. 10 It can be seen that a jitter of magnitude Dx in either the signal-or the reference-arm length will vary phases C 1 and C 2 by k 1 Dx and k 2 Dx, respectively, where k 1 ͑k 2 ͒ is the free-space wave number of the fundamental (second-harmonic) light. As k 2 is exactly double k 1 , we can totally eliminate the effect of this jitter by subtracting twice C 1 from C 2 .…”

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Interferometric phase-dispersion microscopy

et al. 2000

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We describe a new scanning microscopy technique, phase-dispersion microscopy (PDM). The technique is based on measuring the phase difference between the fundamental and the second-harmonic light in a novel interferometer. PDM is highly sensitive to subtle refractive-index differences that are due to dispersion (differential optical path sensitivity, 5 nm). We apply PDM to measure minute amounts of DNA in solution and to study biological tissue sections. We demonstrate that PDM performs better than conventional phasecontrast microscopy in imaging dispersive and weakly scattering samples.

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Interferometric phase-dispersion microscopy

et al. 2000

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“…The f iltered signals are then Hilbert transformed, and the phases, C 1 (fundamental) and C 2 (second-harmonic), are extracted. 8,9 Related phase techniques have been used to measure the dispersion of metals, 10 the refractive index of air, 11 and plasma electron density. 12 Jitter in the path lengths of the interferometer arms due to, for example, vibrations of the mirrors will introduce correlated phase errors between the heterodyne signals.…”

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Measurement of the anomalous phase velocity of ballistic light in a random medium by use of a novel interferometer

2001

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Ballistic light, i.e., radiation that propagates undef lected through a turbid medium, undergoes a small change in phase velocity and exhibits unusual dispersion because of its wave nature. We use a novel highly sensitive differential phase optical interferometer to study these previously unmeasurable phenomena. We find that ballistic propagation can be classified into three regimes based on the wavelength-to-size ratio. In the regime in which the scatterer size is comparable with the wavelength, there is an anomalous phase-velocity increase as a result of adding scatterers of higher refractive index. We also observe an anomaly in the relative phase velocity, where red light is slowed more than blue light even though the added scatterers are made of material with normal dispersion.

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Ultrashort Pulse Application to Dimensional Measurements

Minoshima¹

1999

Springer Series in Photonics

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High-accuracy measurement of air refractive index using two frequency-doubling crystals

Cited by 13 publications

References 8 publications

Interferometric phase-dispersion microscopy

Interferometric phase-dispersion microscopy

Measurement of the anomalous phase velocity of ballistic light in a random medium by use of a novel interferometer

Ultrashort Pulse Application to Dimensional Measurements

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