13 March 2015 The spatially heterodyned spectrometer: A for high resolution Raman spectroscopy?
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Proceedings Volume 9369, Photonic Instrumentation Engineering II; 936903 (2015) https://doi.org/10.1117/12.2076462
Event: SPIE OPTO, 2015, San Francisco, California, United States
Abstract
The spatially heterodyned spectrometer (SHS) is one of a class of interesting Static Fourier Transform Spectrometers (FSTS) which offers particular advantages when high spectral resolution is required over a relatively narrow design wavelength range, and high light throughput is needed. The technique was invented by Harlander and Roesler in 1990, and have been under development in various embodiments since; the original applications were astronomical but other application areas are continually appearing. We have investigated a field-widened SHS in terms of its fundamental spectral resolution and its sensitivity. The light grasp of the SHS is very large compared to “standard” dispersive spectrometer hoverer one must be careful to distinguish between light grasp and sensitivity; our prototype device used a 3mm liquid light guide as the input optic, operating at f/1.4, and was constructed with off-the-shelf optical components, apart from the field widening prisms which were custom made. It demonstrated a S/N ratio of unity with an input power of tens of femto-Watts in a sub-resolution spectral feature, and a spectral resolution of 2.9 wave numbers, operating between 790nm and 940nm. The exposure time was of the order of 60 seconds or greater. We conclude that this arrangement would be an excellent tool for analysis of Raman spectra.
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Christopher N. Pannell, Bill G. Zhang, Murray K. Reed, "The spatially heterodyned spectrometer: A for high resolution Raman spectroscopy?", Proc. SPIE 9369, Photonic Instrumentation Engineering II, 936903 (13 March 2015); doi: 10.1117/12.2076462; https://doi.org/10.1117/12.2076462
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