Zobrazeno 1 - 10
of 50
pro vyhledávání: '"Omid Momtahan"'
Publikováno v:
Applied Physics B. 91:1-6
We present a simple, very compact, and inexpensive spectrometer for diffuse source spectroscopy using only a volume hologram (recorded by two spherical beams) and a CCD camera (or a detector array). We show that this spectrometer can operate well und
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b0e3897d2f57508dda4102c2c68b58e7
https://doi.org/10.1007/s00340-008-2968-8
https://doi.org/10.1007/s00340-008-2968-8
Publikováno v:
Applied Physics B. 90:519-525
In this paper, we report the observation of electron tunneling during two-center recording in LiNbO3:Fe:Mn doped with high Fe concentration. Unlike tunneling in the singly doped lithium niobate that erases the hologram, the effect in two-center recor
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::411b6af1ec46565130c0dfd1f2287e12
https://doi.org/10.1007/s00340-008-2929-2
https://doi.org/10.1007/s00340-008-2929-2
Autor:
Michael E. Gehm, Ali Adibi, Chaoray Hsieh, Haojun Chen, David J. Brady, Steven D. Feller, Omid Momtahan
Publikováno v:
Optics express. 15(9)
We introduce a multiple order coded aperture (MOCA) spectrometer. The MOCA is a system that uses a multiplex hologram and a coded aperture to increase the spectral range and throughput of the system over conventional spectrometers while maintaining s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cb10b0bceffae793085be54e181bc7d6
https://pubmed.ncbi.nlm.nih.gov/19532820
https://pubmed.ncbi.nlm.nih.gov/19532820
Autor:
David J. Brady, Michael E. Sullivan, Ali Adibi, Chaoray Hsieh, Arash Karbaschi, Omid Momtahan
Publikováno v:
Optics express. 12(13)
We investigate the feasibility of designing spectral diversity filters using spherical beam volume holograms. Our experimental results qualitatively show the separation of the information of different incident wavelength channels using spherical beam
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1db9d04af9b955caa7362e024ea598d5
https://pubmed.ncbi.nlm.nih.gov/19483819
https://pubmed.ncbi.nlm.nih.gov/19483819
Publikováno v:
SPIE Proceedings.
Compact and efficient spectrometers are of great interest for biological and environmental sensing. In this paper, we describe a new class of spectrometers that work based on diffractive properties of spherical beam volume holograms (SBVHs) and cylin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b9d196db0db311429497f6e48058255f
https://doi.org/10.1117/12.771287
https://doi.org/10.1117/12.771287
Publikováno v:
Optics letters. 33(1)
We demonstrate a compact and slitless spectrometer with high resolution formed by cascading a Fabry-Perot etalon (FPE) and a cylindrical beam volume hologram (CBVH). The most significant advantage of this combined spectrometer is that we can independ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d2ae50e6084c9ff5a488be2fb9fe81db
https://pubmed.ncbi.nlm.nih.gov/18157248
https://pubmed.ncbi.nlm.nih.gov/18157248
Publikováno v:
LEOS 2007 - IEEE Lasers and Electro-Optics Society Annual Meeting Conference Proceedings.
Holographic spectrometers using cylindrical beam volume holograms are presented with several advantages over conventional spectrometers. We specially show that these spectrometers can be designed to solve the well-known problem of resolution-bandwidt
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0e5fb7c98d9a7788bf5954431408ba53
https://doi.org/10.1109/leos.2007.4382364
https://doi.org/10.1109/leos.2007.4382364
Publikováno v:
2007 Quantum Electronics and Laser Science Conference.
We present compact slit-less spectrometers using cylindrical beam holograms with several advantages over conventional spectrometers. We demonstrate large spectral range spectrometers using spatially multiplexed cylindrical beam holograms without addi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1474e2c5175803e86c10dcc6bb403cd0
https://doi.org/10.1109/qels.2007.4431164
https://doi.org/10.1109/qels.2007.4431164
Autor:
Omid Momtahan, Majid Badieirostami, Ali Adibi, Ali A. Eftekhar, David J. Brady, Chao Ray Hsieh
Publikováno v:
Adaptive Optics: Analysis and Methods/Computational Optical Sensing and Imaging/Information Photonics/Signal Recovery and Synthesis Topical Meetings on CD-ROM.
We have designed a compact spectrometer by cascading a simple Fabry-Perot etalon and a cylindrical beam volume hologram. This spectrometer results in a two-dimensional spatial-spectral mapping in the output plane with ultra-high resolution.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f1c63f15a2e7536dd173aa584c4aab28
https://doi.org/10.1364/cosi.2007.cmc3
https://doi.org/10.1364/cosi.2007.cmc3
Autor:
Chaoray Hsieh, Omid Momtahan, Majid Badieirostami, Ali Adibi, Jón Atli Benediktsson, Bahram Javidi, Karl S. Gudmundsson
Publikováno v:
AIP Conference Proceedings.
Compact and efficient spectrometers are of great interest for biological and environmental sensing. In this talk, we describe a class of spectrometers that work based on diffractive properties of spherical beam and cylindrical beam volume holograms.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c4f525b9b6a4cf09b4e132e7ea7d5407
https://doi.org/10.1063/1.2812308
https://doi.org/10.1063/1.2812308