1. We consider a HeNe laser operating at a wavelength 1-633 nm. The laser resonator is 0.8 m long. The linewidth is broadened to Av=2 GHz due to the Doppler effect. The laser is pumped at a power equal to 4 times the threshold pump power. a) How many modes can oscillate simultaneously? b) We assume that all the modes are locked together and have equal amplitude. What is the repetition rate of the laser (inverse of time between consecutive pulses) and what is the pulse duration?
1. We consider a HeNe laser operating at a wavelength 1-633 nm. The laser resonator is 0.8 m long. The linewidth is broadened to Av=2 GHz due to the Doppler effect. The laser is pumped at a power equal to 4 times the threshold pump power. a) How many modes can oscillate simultaneously? b) We assume that all the modes are locked together and have equal amplitude. What is the repetition rate of the laser (inverse of time between consecutive pulses) and what is the pulse duration?
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Transcribed Image Text:1. We consider a HeNe laser operating at a wavelength 1-633 nm. The laser resonator is 0.8
m long. The linewidth is broadened to Av=2 GHz due to the Doppler effect. The laser is
pumped at a power equal to 4 times the threshold pump power. a) How many modes can
oscillate simultaneously? b) We assume that all the modes are locked together and have
equal amplitude. What is the repetition rate of the laser (inverse of time between
consecutive pulses) and what is the pulse duration?
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