Rayleigh Line Rejection (5)

Question 1

Options for filtering out rayleigh line

Answer 1

Absorption filters, subtractive pre-monochromator, dielectric notch and edge filters, holographic notch filters

Question 2

Three most common methods of filtering

Answer 2

subtractive, holographic, single dielectric

Question 3

What type of instrument incorporates pre-monochromators as Rayleigh filters?

Answer 3

czerny-turner triple spectrograph

Question 4

The OD needed for notch and edge filters

Answer 4

3-6

Question 5

difference between a notch and an edge filter

Answer 5

notch: narrow range, high absorbance; edge: high OD, wide bandpass, used for wavelengths longer than laser wavelength, no anti-stokes

Question 6

Properties of holographic notch filters

Answer 6

several layers of optical density, different cut-on slopes near Rayleigh line, sharp cut-on permits observation of lower raman shifts but makes filter sensitive to angle of incidence

Question 7

Holographic notch filters vs Dielectric filters

Answer 7

high OD at design laser wavelength, high transmission off design laser wavelengths, better able to observe raman shifts close to rayleigh line