Question

A Fabry-Perot laser operates at 1550 nm wavelength. Its cavity length is 350μm and its modal refractive index is n=3.43.

a) What is the wavelength spacing in nm between adjacent lasing modes?

Answer 1

The wavelength spacing between adjacent lasing modes in a Fabry-Perot laser can be calculated using the formula Δλ = λ² / (2 * L * n), where Δλ is the wavelength spacing, λ is the operating wavelength, L is the cavity length, and n is the modal refractive index.

Step-by-step explanation:

The wavelength spacing between adjacent lasing modes in a Fabry-Perot laser can be calculated using the formula:

Δλ = λ² / (2 * L * n)

Where Δλ is the wavelength spacing, λ is the operating wavelength, L is the cavity length, and n is the modal refractive index. Plugging in the given values:

Δλ = (1550 nm)² / (2 * 350 μm * 3.43)

Solving this equation will give you the wavelength spacing in nm between adjacent lasing modes.