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A helium neon laser is operating at 632.8 (nm) and has a tube diameter of 0.75 (mm) and a length of 35 (cm). The end mir
Posted: Fri Jul 01, 2022 6:10 am
by answerhappygod
- A Helium Neon Laser Is Operating At 632 8 Nm And Has A Tube Diameter Of 0 75 Mm And A Length Of 35 Cm The End Mir 1 (68.23 KiB) Viewed 20 times
A helium neon laser is operating at 632.8 (nm) and has a tube diameter of 0.75 (mm) and a length of 35 (cm). The end mirrors have reflectances of 98.0% and 99.9%. The output power from the laser is 0.8 (mW). The linewidth, Av, is 1.5 (GHz), and the loss coefficient, as, is 0.05 (m¹). The spontaneous emission lifetime is 100 (ns). a) What is the threshold gain for this laser? (7 points) b) What is the threshold population inversion? (6 points) c) What is the photon cavity lifetime? (6 points) d) What is the photon concentration in the laser cavity? (6 points)