A strontium titanate prism (np = 2.32) is used as an output coupler to coupler light out of a Ta2O5 waveguide (n2 = 2.09). Three “m- lines” are visible at angles of 36.5◦, 30.2◦, and 24.6◦ from the...

A strontium titanate prism (np = 2.32) is used as an output coupler to coupler light out of a Ta2O5 waveguide (n2 = 2.09). Three “m- lines” are visible

at angles of 36.5◦, 30.2◦, and 24.6◦ from the waveguide surface. The output

face of the prism makes an angle of 60◦ with the waveguide surface and the

wavelength λ0 is 9050 A. What are the ˚ β’s of the three modes?