Principles and spectroscopic applications of volume holographic optics

Tedesco, James M.; Owen, Harry; Pallister, David M.; Morris, M.D.

doi:10.1021/ac00057a002

Cited by 29 publications

(23 citation statements)

References 10 publications

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“…VP gratings are currently fabricated by KOSI and utilized in their line of Raman spectrographs 18 . Although they currently only fabricate gratings of up to 75 by 100 mm in size, their facility can easily accommodate an upgrade for the production of gratings with dimensions of 200 by 280 mm.…”

Section: Large Gratingsmentioning

confidence: 99%

<title>Volume-phase holographic gratings and their potential for astronomical applications</title>

1998

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A diffraction grating technology based upon volume-phase holograms shows promise of enhanced performance for many applications in astronomical spectroscopy over classical surface-relief grating technology. We present a discussion of the underlying physics of a volume-phase grating, give some theoretical performance characteristics, present performance data for a real volume-phase grating, and discuss some potential applications for this grating technology.

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Section: Large Gratingsmentioning

confidence: 99%

<title>Volume-phase holographic gratings and their potential for astronomical applications</title>

1998

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“…29 Production methods similar to those used for producing holographic filters can be used to manufacture holographic gratings to achieve the subsequent wavelength dispersion of the Raman signal. 30 These devices have a number of advantages over conventional ruled or replicated gratings, including elimination of virtually 100% of the ghost and stray light artifacts of conventional gratings (see Figure 3). This is mainly because the lines on a conventional ruled grating are imperfect, whereas those produced by holographic techniques are virtually error free.…”

Section: Holographic Opticsmentioning

confidence: 99%

The Role of ConfocalRaman Spectroscopy in Food Science

Pudney

Hancewicz

2001

Handbook of Vibrational Spectroscopy

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This chapter outlines why confocal Raman has developed into a tool that can offer unique insights into food science. It shows how the inherent strengths of Raman spectroscopy of chemical specificity and structural sensitivity can be exploited on the micron length scale. It covers the essentials elements of how a confocal Raman microscope system works. This is followed by a practical description of the way in which a confocal Raman system should be used and also how to avoid some of the common pitfalls, especially with regard to depth resolution. Raman spectra can contain a mass of information and, in order to fully use this, considerable effort needs to put into data analysis. Appropriate methodologies are discussed in some detail with discussion on the strategies one can employ, with enlightening examples to show practically the results that can be obtained.

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“…20 This is a two-fiber device; the input laser beam is collimated and passes through a holographic grating/spatial filter combination, which filters out the unwanted silica Raman signal. The spectrally pure beam is then reflected off a holographic notch filter 21 and is focused onto the sample though an objective lens of arbitrary focal length. The backscattered light then travels coaxially backwards along the laser path, is collimated by the same lens which focused the laser beam onto the sample, and strikes the same notch filter, which rejects the Rayleigh light but transmits the wavelength-shifted Raman light with high (>75%) efficiency.…”

Section: Coaxial Imaging Probesmentioning

confidence: 99%

“…The most common configuration for process Raman analyzers is the combination of a frequency-dispersing element (a polychromator) coupled to a multichannel detector. The dispersing element is normally either a ruled reflection grating, or a volume phase holographic transmission grating, 12,21 while the current detector of choice is the two-dimensional CCD (see Array Detectors for Raman Spectroscopy). The spectrograph design is normally either a traditional Czerny-Turner, or more recently an axially transmissive layout.…”

Section: Spectral Analysismentioning

confidence: 99%

Process Measurements by Raman Spectroscopy

Everall

Clegg²,

King³

2001

Handbook of Vibrational Spectroscopy

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Raman spectroscopy has long been recognized as a powerful analytical tool, capable of characterizing a wide range of materials, but for many years the size and complexity of instrumentation confined it to the research laboratory, making process analysis impractical. However, compact, sensitive and robust Raman instruments are now available that can be readily interfaced to production processes. This article attempts to illustrate the general capabilities of Raman spectroscopy as a process analytical tool. We first consider the instrumental and engineering aspects of making Raman measurements under production conditions, and then discuss some of the areas in which it has been fruitfully employed. The application examples discussed were chosen to cover the main range of sample types that one might encounter in the industry. We also describe some common artifacts and problems, which can arise and confuse the new practitioner.

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Principles and spectroscopic applications of volume holographic optics

Cited by 29 publications

References 10 publications

<title>Volume-phase holographic gratings and their potential for astronomical applications</title>

<title>Volume-phase holographic gratings and their potential for astronomical applications</title>

The Role of ConfocalRaman Spectroscopy in Food Science

Process Measurements by Raman Spectroscopy

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