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Brunel M, Demange G, Fromager M, Talbi M, Zapolsky H, Patte R, Aït Ameur K, Jacquot-Kielar J, Coetmellec S, Gréhan G, Quevreux B. Instrumentation for ice crystal characterization in laboratory using interferometric out-of-focus imaging. Rev Sci Instrum 2017; 88:083108. [PMID: 28863671 DOI: 10.1063/1.4997959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Airborne characterization of ice crystals has important applications. The extreme difficulty of realizing in situ tests requires the development of a complete instrumentation in the laboratory. Such an installation should enable design, development, test, and calibration of instruments in conditions as close as possible to real ones. We present a set of numerical and experimental tools that have been developed to realize ice crystal sensors based on interferometric particle imaging. The set of tools covers the development of complementary simulators for crystal growth and interferometric particle imaging predictions, experimental generation of "programmable" ice crystals, and instrumentation of a freezing column where different techniques as in-focus imaging, out-of-focus imaging, and digital in-line holography can be combined simultaneously for test and calibration.
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Affiliation(s)
- M Brunel
- UMR CNRS 6614 CORIA, Université de Rouen, Avenue de l'Université, Saint-Etienne du Rouvray 76801, France
| | - G Demange
- CUMR CNRS 6634 GPM, Université de Rouen, Avenue de l'Université, Saint-Etienne du Rouvray 76801, France
| | - M Fromager
- UMR CNRS 6252 CIMAP, CEA, Ensicaen, Université de Caen, 6 Boulevard Maréchal Juin, Caen 14050, France
| | - M Talbi
- UMR CNRS 6614 CORIA, Université de Rouen, Avenue de l'Université, Saint-Etienne du Rouvray 76801, France
| | - H Zapolsky
- CUMR CNRS 6634 GPM, Université de Rouen, Avenue de l'Université, Saint-Etienne du Rouvray 76801, France
| | - R Patte
- CUMR CNRS 6634 GPM, Université de Rouen, Avenue de l'Université, Saint-Etienne du Rouvray 76801, France
| | - K Aït Ameur
- UMR CNRS 6252 CIMAP, CEA, Ensicaen, Université de Caen, 6 Boulevard Maréchal Juin, Caen 14050, France
| | - J Jacquot-Kielar
- UMR CNRS 6614 CORIA, Université de Rouen, Avenue de l'Université, Saint-Etienne du Rouvray 76801, FranceCUMR CNRS 6634 GPM, Université de Rouen, Avenue de l'Université, Saint-Etienne du Rouvray 76801, FranceUMR CNRS 6252 CIMAP, CEA, Ensicaen, Université de Caen, 6 Boulevard Maréchal Juin, Caen 14050, France
| | - S Coetmellec
- UMR CNRS 6614 CORIA, Université de Rouen, Avenue de l'Université, Saint-Etienne du Rouvray 76801, France
| | - G Gréhan
- UMR CNRS 6614 CORIA, Université de Rouen, Avenue de l'Université, Saint-Etienne du Rouvray 76801, France
| | - B Quevreux
- UMR CNRS 6614 CORIA, Université de Rouen, Avenue de l'Université, Saint-Etienne du Rouvray 76801, France
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Fromager M, Aït Ameur K, Brunel M. Digital micromirror device as programmable rough particle in interferometric particle imaging. Appl Opt 2017; 56:3594-3598. [PMID: 28430227 DOI: 10.1364/ao.56.003594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The 2D autocorrelation of the projection of an irregular rough particle can be estimated using the analysis of its interferometric out-of-focus image. We report the development of an experimental setup that creates speckle-like patterns generated by "programmable" rough particles of desired-shape. It should become an important tool for the development of new setups, configurations, and algorithms in interferometric particle imaging.
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Abstract
I address the influence of the direct coupling of the average lattice strains to the active ions on the pulse shape and the far-field beam spreading of a Q-switched laser. Calculations are made for the Cr(3+): sapphire system. The dynamic behavior of laser divergence as the pulse develops is studied without and with an internal aperture. The results can be used to search for similar effects in lasers involving other ions, such as Ti(3+) and Cr(4+).
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Ameur KA. Transverse properties of a Michelson mirror. Appl Opt 1997; 36:1860-1866. [PMID: 18250873 DOI: 10.1364/ao.36.001860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
I calculate and compare the effective reflectivities of the first three Laguerre-Gauss modes incident on an asymmetric Michelson mirror (MM) using a power ratio. It is shown that the oscillation of a laser, made with a MM in a three-mirror configuration, can be switched from one transverse mode to another simply by controlling the phase delay between the two MM arms.
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