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Chevron-Type Dielectric Filter Set for Efficient Narrow-Band Laser Line Rejection in Raman Microspectrometers

Volume 48, Number 11 (Nov. 1994) Page 1399-1402

Puppels, Gerwin J.; de Grauw, Cees G.; te Plate, Maurice B.J.; Greve, Jan


A chevron-type dielectric bandpass filter set is described which combines laser line rejection by a factor > 108 with a high throughput of Raman scattered light (70%). The rejection bandwidth is 60 cm-1 full width at half-maximum. Stokes and anti-Stokes Raman spectra can be recorded simultaneously from approximately 20 cm-1 from the laser line. The filter set, moreover, takes care of efficient coupling of microscope and spectrometer, replacing an otherwise necessary beamsplitter.