If a quartz prism with an index of refraction = 1.65 is used to fabricate a grating on a GaAs waveguide as shown in Fig. 7.10, with the angle α = 5◦: (a) What is the spacing of the grating bars if a...

If a quartz prism with an index of refraction = 1.65 is used to fabricate a

grating on a GaAs waveguide as shown in Fig. 7.10, with the angle α = 5◦:

(a) What is the spacing of the grating bars if a He-Cd laser (wavelength =

325 nm) is used?

(b) What is the spacing of the grating bars if an ArF laser (wavelength =

193 nm) is used?