A Speckle-Enhanced Prism Spectrometer with High Dynamic Range

S. KaanÇetindağ; M. Fatih Toy; Onur Ferhanoglu; Fehmi Civitci

doi:10.1109/LPT.2018.2879247

A Speckle-Enhanced Prism Spectrometer with High Dynamic Range

S. KaanÇetindağ, M. Fatih Toy, Onur Ferhanoglu^*, Fehmi Civitci

^*Corresponding author for this work

Department of Electronics and Communication Engineering

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

We present a novel spectrometer device offering a wide wavelength range and high resolution. The device builds upon a conventional prism spectrometer; however, an additional scattering medium is introduced to generate a wavelength-dependent speckle pattern on the detector array. Simultaneous use of the prism and the scattering medium allows for both improved resolution and wavelength range. The generated speckle pattern secures a significant improvement in the resolution (up to 100 folds) and dynamic range over a conventional prism spectrometer. With the proposed spectrometer, implemented using a CCD camera, we demonstrate up to 17-pm resolution at 855-nm central wavelength and 756.5-nm wavelength range revealing a dynamic range of 44 500. The dynamic range could be further improved upon using a detector array having larger area and a scattering medium offering a narrower spectral correlation function. With further development, the proposed device could be useful in a variety of spectroscopy applications, such as deep imaging of retinal layers in optical coherence tomography.

Original language	English
Article number	8519785
Pages (from-to)	2139-2142
Number of pages	4
Journal	IEEE Photonics Technology Letters
Volume	30
Issue number	24
DOIs	https://doi.org/10.1109/LPT.2018.2879247
Publication status	Published - 15 Dec 2018

Bibliographical note

Publisher Copyright:
© 1989-2012 IEEE.

Funding

Manuscript received September 11, 2018; revised October 21, 2018; accepted October 30, 2018. Date of publication November 1, 2018; date of current version November 28, 2018. This work was supported by the Scientific and Technological Research Council of Turkey (TUBITAK) under Grant 116F142. (Corresponding author: Onur Ferhanog˘lu.) S¸. K. Çetindag˘, O. Ferhanog˘lu, and F. Çivitci are with the Department of Electronics and Communication Engineering, Istanbul Technical University, 34469 Istanbul, Turkey (e-mail: [email protected]).

Funders	Funder number
TUBITAK	116F142
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu

Keywords

Prism
speckle
spectroscopy

Access to Document

10.1109/LPT.2018.2879247

Cite this

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AB - We present a novel spectrometer device offering a wide wavelength range and high resolution. The device builds upon a conventional prism spectrometer; however, an additional scattering medium is introduced to generate a wavelength-dependent speckle pattern on the detector array. Simultaneous use of the prism and the scattering medium allows for both improved resolution and wavelength range. The generated speckle pattern secures a significant improvement in the resolution (up to 100 folds) and dynamic range over a conventional prism spectrometer. With the proposed spectrometer, implemented using a CCD camera, we demonstrate up to 17-pm resolution at 855-nm central wavelength and 756.5-nm wavelength range revealing a dynamic range of 44 500. The dynamic range could be further improved upon using a detector array having larger area and a scattering medium offering a narrower spectral correlation function. With further development, the proposed device could be useful in a variety of spectroscopy applications, such as deep imaging of retinal layers in optical coherence tomography.

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A Speckle-Enhanced Prism Spectrometer with High Dynamic Range

Abstract

Bibliographical note

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Keywords

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