The Impact of Volume Phase Holographic Filters and Gratings on the Development of Raman Instrumentation

Abstract

Volume phase holographic technology was originally developed and commercialized to produce holographic combiners for head-up displays (HUD) in fighter aircraft. By applying this technology to meet the needs of Raman spectroscopy three new optical components have been developed and incorporated into the latest generation of Raman instrumentation.

Developments in spontaneous and coherent Raman scattering microscopic imaging for biomedical applications

“…The impact of volume phase holographic filters and grating on the development of Raman instrumentation was previously reported. 21…”

High-speed line-scan confocal Raman microscope with enhanced diffraction efficiency

“…Volume phase holographic (VPH) gratings have become popular given their higher diffraction efficiency than conventional surface-relief reflection gratings [12,13]. Furthermore, the incident angle to the VPH grating can be adjusted to achieve higher diffraction efficiency for the desired spectral region [14].…”

Development of a multiplexing fingerprint and high wavenumber Raman spectroscopy technique for real-timein vivotissue Raman measurements at endoscopy

“…We integrate a customized volume phase holographic (VPH) dual-transmission grating consisting of two hybrid VPH gratings (1400 and 1600 g∕mm) (HoloPlex, Kaiser Optical Systems Inc., Ann Arbor, Michigan) into the spectrograph for Raman spectral dispersion. 10 The hybrid gratings are cemented closely together with a tilted angle of ∼0.2-deg to achieve a separation between the low frequency and high frequency spectral components. The Bragg wavelengths of the hybrid gratings are tuned to two different spectral ranges (i.e., −150 to 1950 cm −1 and 1750 to 3600 cm −1 ) such that it disperses the tissue Raman spectra (i.e., FP and HW spectra) onto two separate vertical segments of the CCD, accordingly.…”