Consider a crystal of ruby laser whose length is 6 cm and the refractive index is 1.8, emits the wavelength of about 0.55 μm. What will be the value of number of longitudinal modes?
A. 3.9 x 105
B. 4.9 x 105
C. 5.6 x 105
D. 7.7 x 105
Answer:A
Consider a crystal of ruby laser whose length is 6 cm and the refractive index is 1.8, emits the wavelength of about 0.55 μm. What will be the value of number of longitudinal modes?
A. 3.9 x 105 B. 4.9 x 105 C. 5.6 x 105 D. 7.7 x 105