Holographic grating with two spatial frequencies for the simultaneous study of two spectral profiles

Carranza, Carlos de Castro; Baraja, Angel Máximo de Frutos; Calzada, Juan Antonio Aparicio; Escudero, F. A. Frechoso; Gómez, Santiago; Criado, J. L. Molpeceres

doi:10.1364/ao.31.003131

Cited by 3 publications

(2 citation statements)

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“…The holographic nature of these gratings allows the stacking of holograms to make a variety of complex grating structures 16,17 . A single grating assembly might contain a second grating with the fringes perpendicular to the first in order to provide cross-dispersion.…”

Section: Complex Grating Structuresmentioning

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: Complex Grating Structuresmentioning

confidence: 99%

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

1998

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“…It is possible to stack multiple VPH gratings within a single element 2,3 in which each individual grating operates on a component of the optical spectrum. One possible grating might include a second hologram with fringes rotated by 90 degrees with respect to the first grating to provide cross-dispersion.…”

Section: Complex Grating Structuresmentioning

confidence: 99%

<title>Astronomical applications of volume-phase holographic gratings</title>

1999

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Volume-Phase Holographic (VPH) gratings provide unique capabilities over classical surface gratings which can be exploited in modern astronomical spectrographs. The peak diffraction efficiency of a VPH grating is tunable due to the nature of Bragg diffraction. This allows a single dispersing element to serve the function of several classical gratings. Additionally, VPH grating structures can be stacked to produce complex gratings capable of directing the diffracted light in ways that classical gratings can not. INTRODUCTIONA VPH grating diffracts light through the mechanism of Bragg diffraction inside a volume in which periodic modulation of the refractive index forms the grating structure. The intersection of these modulations with the surface of the element form a surface grating that disperses the light according to the classical grating equation. The energy envelope of the diffracted light is, however, controlled by the fringe modulation frequency and its orientation within the grating medium and provides peak diffraction efficiency at the wavelength that meets the Bragg condition. For a grating with fringes normal to its surface, the Bragg condition is given by mνλ = 2n sin(α) (1) where m is the Bragg order, ν is the fringe frequency, λ is the wavelength of light, n is the refractive index of the grating medium, and α is the diffraction angle within the grating medium.

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