Question

A carbon dioxide laser is an infrared laser. A CO2 laser with a cavity length of 48.4 cm oscillates in the m=100,000.0 mode.
1. What is the wavelength of the laser beam?
2. What is the frequency of the laser beam?

Answer 1

1. wavelength = (cavity length)/50,000
(50,000 is the number of half waves between the mirrors)

2. frequency = (speed of light)/wavelength

Answer 2

1) wavelength= 2L/m
m=100000
L=48.4/100=0.484m

wavelength= 9.68x10^-6m

2) fn=n(speed of light)/wavelength
speed of light =299,792,458 m/s

fn= 100000(299792458)/9.68x10^-6
= 3.10x10^28 Hz