Find the number of standing wave cavity modes within the gain bandwidth of the argon ion laser of problem 1 if the laser system uses a resonator with flat mirrors separated by a distance d = 0.5 m.
The output of an argon ion laser can consist of a number of modes of frequency that match the cavity resonance condition and are within the gain bandwidth of the lasing transition. The gain bandwidth of the lasing transition is roughly equal to the width of the atomic lineshape function g(ν) associated with the lasing transition. Take the gain bandwidth of an argon ion laser to be 2 GHz and the linewidth of an individual mode from the argon ion laser to be 100 kHz. The coherence time of a light beam is roughly equal to the reciprocal of the spread of frequencies present in light. Find the coherence lime and the coherence length of the argon ion laser if
a. The laser output consists of a single mode.
b. The laser output consists of a number of modes with frequencies spread across the gain bandwidth of the lasing transition.
Problem 1
The output of an argon ion laser can consist of a number of modes of frequency that match the cavity resonance condition and are within the gain bandwidth of the lasing transition. The gain bandwidth of the lasing transition is roughly equal to the width of the atomic lineshape function g(ν) associated with the lasing transition. Take the gain bandwidth of an argon ion laser to be 2 GHz and the linewidth of an individual mode from the argon ion laser to be 100 kHz. The coherence time of a light beam is roughly equal to the reciprocal of the spread of frequencies present in light. Find the coherence lime and the coherence length of the argon ion laser if
a. The laser output consists of a single mode.
b. The laser output consists of a number of modes with frequencies spread across the gain bandwidth of the lasing transition.
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