Conferencia
Abstract:
We study and test a new technique for in-line digital holography which avoids the formation of the conjugate images. Inline digital holography is based in a common path configuration. In this case, the hologram is produced by the interference between the reference wave front and the diffracted wave front by an almost transparent object. Twin images are obtained with obscured rings that difficult the determination of the best focusing plane. To avoid the conjugated image, the information of the magnitude and phase of the wave front are needed. In a recent work a new in-line digital holography technique was proposed. In this method the object is illuminated with a collimated wave front. A plane, close to the particles distribution is imaged onto a CCD by means of a convergent lens and at the same time, a knife edge is placed in the focal plane of the lens in order to block half of spatial frequency spectrum. In this way, by means of a numerical processing performed on the Fourier plane, it is possible to eliminate one of the components (real or conjugate) of the reconstructed images nevertheless it is observed a tiny deformation of the resulting hologram image. To compensate this effect, we propose a new configuration in which we implement the knife edge technique on both parts of the spectrum at the same time. Finally in the computer, we process the holograms to build one complete without deformation. This hologram is used to recover the wave front at different planes without the influence of the conjugate image. © 2015 Copyright SPIE.
Registro:
| Documento: | Conferencia |
| Título: | In-line digital holography with double knife edge |
| Autor: | Ramirez, C.; Iemmi, C.; Campos, J.; Silver R.M.; Bodermann B.; Frenner K.; The Society of Photo-Optical Instrumentation Engineers (SPIE) |
| Filiación: | Departamento de Física, Universidad Autónoma de Barcelona, Bellaterra, 08193, Spain Deptartamento de Física, FCEyN, Universidad de Buenos Aires, Buenos Aires, 1428, Argentina |
| Palabras clave: | holography; in-line; knife edge; reconstruction; single-sideband; spatial light modulator; twin images; Computer generated holography; Deformation; Holography; Image processing; Image reconstruction; Light modulators; Lithography; Units of measurement; Wavefronts; In-line digital holography; Knife edge; Knife-edge techniques; Particles distribution; Single side bands; Spatial frequency spectrums; Spatial light modulators; Twin-image; Holograms |
| Año: | 2015 |
| Volumen: | 9526 |
| DOI: | http://dx.doi.org/10.1117/12.2184799 |
| Título revista: | Modeling Aspects in Optical Metrology V |
| Título revista abreviado: | Proc SPIE Int Soc Opt Eng |
| ISSN: | 0277786X |
| CODEN: | PSISD |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0277786X_v9526_n_p_Ramirez |
Referencias:
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Citas:
---------- APA ----------
Ramirez, C., Iemmi, C., Campos, J., Silver R.M., Bodermann B., Frenner K. & The Society of Photo-Optical Instrumentation Engineers (SPIE) (2015) . In-line digital holography with double knife edge. Modeling Aspects in Optical Metrology V, 9526.http://dx.doi.org/10.1117/12.2184799
---------- CHICAGO ----------
Ramirez, C., Iemmi, C., Campos, J., Silver R.M., Bodermann B., Frenner K., et al. "In-line digital holography with double knife edge" . Modeling Aspects in Optical Metrology V 9526 (2015).http://dx.doi.org/10.1117/12.2184799
---------- MLA ----------
Ramirez, C., Iemmi, C., Campos, J., Silver R.M., Bodermann B., Frenner K., et al. "In-line digital holography with double knife edge" . Modeling Aspects in Optical Metrology V, vol. 9526, 2015.http://dx.doi.org/10.1117/12.2184799
---------- VANCOUVER ----------
Ramirez, C., Iemmi, C., Campos, J., Silver R.M., Bodermann B., Frenner K., et al. In-line digital holography with double knife edge. Proc SPIE Int Soc Opt Eng. 2015;9526.http://dx.doi.org/10.1117/12.2184799
