Suppressing the Multiplex Disadvantage in Photon-Noise Limited Interferometry Using Cross-Dispersed Spatial Heterodyne Spectrometry

Egan, Miles J.; Angel, S. Michael; Sharma, Shiv K.

doi:10.1177/0003702820946739

Cited by 10 publications

(8 citation statements)

References 24 publications

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“…18 The SHS system’s sensitivity can also be improved further by using a prism or transmission grating to separate out the Fizeau fringes for each Raman feature, further improving the sensitivity for weaker Raman modes in the SHRS system. 54 These improvements in sensitivity compared to traditional dispersive spectrometers allow for the detection of chemical constituents in a sample, which are lower in concentration. Conversely, the higher sensitivity leads to reduced accumulation times when gathering spectra from samples as well, freeing up time to perform other scientific measurements.…”

Section: Resultsmentioning

confidence: 99%

Remote Raman Sensing Using a Single-Grating Monolithic Spatial Heterodyne Raman Spectrometer: A Potential Tool for Planetary Exploration

et al. 2022

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Advances in Raman instrumentation have led to the implementation of a remote dispersive Raman spectrometer on the Perseverance rover on Mars, which is used for remote sensing. For remote applications, dispersive spectrometers suffer from a few setbacks such as relatively larger sizes, low light throughput, limited spectral ranges, relatively low resolutions for small devices, and high sensitivity to misalignment. A spatial heterodyne Raman spectrometer (SHRS), which is a fixed grating interferometer, helps overcome some of these problems. Most SHRS devices that have been described use two fixed diffraction gratings, but a variance of the SHRS called the one-grating SHRS (1g-SHRS) replaces one of the gratings with a mirror, which makes it more compact. In a recent paper we described monolithic two-gratings SHRS, and in this paper, we investigate a single-grating monolithic SHRS (1g-mSHRS), which combines the 1g-SHRS with a monolithic setup previously tested at the University of South Carolina. This setup integrates the beamsplitter, grating, and mirror into a single monolithic device. This reduces the number of adjustable components, allows for easier alignment, and reduces the footprint of the device (35 × 35 × 25 mm with a weight of 80 g). This instrument provides a high spectral resolution (∼9 cm−1) and large spectral range (7327 cm−1) while decreasing the sensitivity to alignment with a field of view of 5.61 mm at 3m. We discuss the characteristics of the 1g-mSHRS by measuring the time-resolved remote Raman spectra of a few inorganic salts, organics, and minerals at 3 m. The 1g-mSHRS makes a good candidate for planetary exploration because of its large spectral range, greater sensitivity, competitively higher spectral resolution, low alignment sensitivity, and high light throughput in a compact easily aligned system with no moving parts.

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Section: Resultsmentioning

confidence: 99%

Remote Raman Sensing Using a Single-Grating Monolithic Spatial Heterodyne Raman Spectrometer: A Potential Tool for Planetary Exploration

et al. 2022

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“…Afterwards, we also cleansed them one more time with anhydrous ethanol by immersing them in ethanol (80 °C, let dry for 6 hours). We dried the precursor then calcined it in air under 900 °C for 2 hours to get the desired phosphor [7]- [9].…”

Section: Methodsmentioning

confidence: 99%

Selection of Gd2(WO4)3:Tb3+ for inproving color deviation in white light-emitting diodes

Thi

Anh

2022

IJEECS

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This study successfully using the hydrothermal technique to synthesize <a name="_Hlk81726620"></a>Gd2(WO4)3:Tb3+ phosphors when subjected to calcination under the temperature of 900°C. Here are some aspects that were thoroughly examined: the crystal formation, photoluminescence, photoluminescence excitation, as well as fluorescent degradation for the samples. The (Gd2-xTbx)(WO4)3 (x=0.01-0.15) phosphors exhibit a bright discharge of green under 547 nm (5D4→7F5 shift for Tb3+) when excited at 270 nm (4f8→4f75d1 shift for Tb3+). Because of the exchange interaction between Tb3+, the quenching concentration was determined to be around 10%. The addition of Tb3+ had no effect on the (Gd2-xTbx)(WO4)3 phosphors' CIE chromaticity coordinates (~0.33±0.02, ~0.60±0.02) or color temperatures (~5542 K). Nevertheless, when the Tb3+ content increased, the fluorescence lifespan for 547 nm emission reduced due to energy transfer between Tb3+. The strong green emission from Gd2(WO4)3:Tb3+ phosphors is a potential element for WLEDs and display areas.

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“…19 In 2020, Egan et al set a cylindrical lens at the back end of the collimating system for beam compression, combined with an Amici prism, to construct an SHRS system without filters. 20 Theoretically, the one-dimensional beam compression function of the cylindrical lens can be realized in both the collimating and imaging optical paths. However, due to the alignment errors in the interferometer setup, the zero optical path difference points of each row of interference data are inconsistent, resulting in "twisted fringes" in the interferogram.…”

Section: Design Of Raman Spectroscopy Detection Systemmentioning

confidence: 99%

Design and evaluation of spatial heterodyne Raman spectrometer at 785 nm excitation wavelength

Bai,

Luo,

et al. 2024

Opt. Eng.

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Raman spectroscopy has emerged as an essential technique for material composition analysis due to its noncontact, nondestructive, and rapid characteristics. Spatial heterodyne spectroscopy offers the advantages of high stability, high throughput, and ultra-high spectral resolution, making it particularly suitable for Raman spectroscopic detection. The main design parameters of a spatial heterodyne Raman detection system were determined under near-infrared wavelength excitation: a Raman shift detection range of 300 to 2000 cm −1 and a spectral resolution of 5 cm −1 at an excitation wavelength of 785 nm. The optical design of the dispersion module and imaging module was completed. Test results demonstrate that the spectrometer achieves a spectral resolution of 5.33 cm −1 and can detect Raman shifts in the range of 315 to 2131.6 cm −1 . Verification tests on cyclohexane and lipstick samples confirm that the system exhibits excellent fluorescence suppression capability, with a signal-to-noise ratio of the cyclohexane Raman peak reaching 1600.8.

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Suppressing the Multiplex Disadvantage in Photon-Noise Limited Interferometry Using Cross-Dispersed Spatial Heterodyne Spectrometry

Cited by 10 publications

References 24 publications

Remote Raman Sensing Using a Single-Grating Monolithic Spatial Heterodyne Raman Spectrometer: A Potential Tool for Planetary Exploration

Remote Raman Sensing Using a Single-Grating Monolithic Spatial Heterodyne Raman Spectrometer: A Potential Tool for Planetary Exploration

Selection of Gd2(WO4)3:Tb3+ for inproving color deviation in white light-emitting diodes

Design and evaluation of spatial heterodyne Raman spectrometer at 785 nm excitation wavelength

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