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Short-coherence-length multipass interferometer
Optics Letters, 1995A simple multipass interferometer is described that takes advantage of the limited coherence length of a light source in order to increase the sensitivity. The sensitivity augmentation is accomplished by insertion of a beam splitter into one leg of the interferometer, thereby achieving multiple reflections between the end mirror and the beam splitter ...
T E, Carlsson, N, Abramson
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Transverse Coherence Length (ro ) Observations
SPIE Proceedings, 1985The transverse coherence length (r0) was directly measured approximately every 5 minutes from 29 August to 28 September 1984 at MTh, I,=1). An MTF-device was used with stellar sources for the ro observations. The diurnal variation of ro is discussed and related to processes affecting optical turbulence in the planetary boundary layer.
F. D. Eaton +3 more
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Long coherence length interferometer
Review of Scientific Instruments, 1993An interferometer has been developed which is capable of measuring the envelope of the coherence function of lasers whose mode lifetimes exceed 300 ns, corresponding to lengths over 100 m. The precision of this interferometer is determined to be 6.0%. The interferometer utilizes optical fibers for the purpose of optical delay.
David Statman +3 more
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SHORT COHERENCE LENGTH IN CUPRATE SUPERCONDUCTORS
Modern Physics Letters B, 2006We investigated very short coherence lengths, ξCu in the high transition temperature superconductors. It is shown that phonon-enhanced spin fluctuations drive this superconductivity once more, as was as suggested by us [Phys. Rev. B61, 4289]. The short coherence length, ξCu in cuprate superconductors results from the giant superconducting gap.
Koo, Je Huan, Cho, Guangsup
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Coherence length measured directly by holography
Applied Optics, 1989We present a holographic method for measuring directly the complete temporal coherence function of a pulsed laser on a single pulse. The method is easy to implement and yields the exact coherence length even or lasers with complex spectral content where the conventional method using a Fabry-Perot interferometer would fail.
R F, Wuerker, J, Munch, L O, Heflinger
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Short-coherence-length superconductors
IBM Journal of Research and Development, 1989We first briefly review the phenomenological Ginzburg Landau and the microscopic BCS concepts of the coherence length. We compare the BCS and the experimental values, as determined from measurements of the nucleation field. It appears that the BCS expression is in excellent agreement with experiment for the low Tc superconductors, but that for all ...
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Coherence-length adapted hologram-interferometer
Applied Optics, 1977The design of a diffraction shearing hologram interferometer is analyzed. It is used for temporal coherence measurements of thermal and laser sources. Formulas, geometries, experimental setup, and correction factors for spatial coherence and for the finite dimension of the detector surface are given. Models of holograms, adapted to coherence lengths in
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Coherence lengths and neutron optics
Physical Review B, 1987The dynamical diffraction of divergent beams and its application to neutron interferometry are considered. The coherence properties of thermal neutrons are studied, and it is shown that the extreme anisotropy of dynamically diffracted wave packets should be included in the discussion of coherence lengths.
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Microcavity transverse coherence length and microlaser threshold
Optics Letters, 1995The concept of transverse coherence length in an active microscopic cavity is investigated with regard to the threshold of the microlaser action. This physical parameter is related to the linear spatial extent, or the effective radius, of the transverse lasing mode operating in a plane Fabry-Perot microcavity.
A, Aiello +3 more
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Determination of coherence length in biological tissues
Lasers in Surgery and Medicine, 2011AbstractBackground and ObjectiveLately in phototherapy the use of diodes instead of lasers was suggested for economical and practical reasons. It has been argued that lasers have no preference over diodes since they lose their coherence once penetrating biological tissues. However, this point has never been experimentally proven.
Dror, Fixler +3 more
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