Pb. 4 If a spectral filter with a bandwidth of 0.1nm is used to obtain a single longitudinal mode from a He-Ne laser, what should be the length of the laser cavity?

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Please I want a correct and clear solution to this question. The solution must be clear and handwritten. Course name: Lasers and its Applications 412PHYS
Pb. 4
If a spectral filter with a bandwidth of 0.1nm is used to obtain a single longitudinal mode
from a He-Ne laser, what should be the length of the laser cavity?
Transcribed Image Text:Pb. 4 If a spectral filter with a bandwidth of 0.1nm is used to obtain a single longitudinal mode from a He-Ne laser, what should be the length of the laser cavity?
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