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If a spectral filter with a bandwidth of 0.2 nm is used to obtain a single longitudinal mode from a He-Ne laser ( the wavelength 632 nm), what should be the length of the laser cavity? Select one: a. L2 0.002 m b. L< 0.001 m C. L2 0.001 m d. L < 0.002 m

If a spectral filter with a bandwidth of 0.2 nm is used to obtain a single longitudinal mode from a He-Ne laser ( the wavelength 632 nm), what should be the length of the laser cavity? Select one: a. L2 0.002 m b. L< 0.001 m C. L2 0.001 m d. L < 0.002 m

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If a spectral filter with a bandwidth of 0.2 nm is used to obtain a single longitudinal mode from a He-Ne laser ( the wavelength 632 nm), what should be the length of the laser cavity? Select one: a. L2 0.002 m b. L< 0.001 m с. L 2 0.001 m d. L < 0.002 m
Transcribed Image Text:If a spectral filter with a bandwidth of 0.2 nm is used to obtain a single longitudinal mode from a He-Ne laser ( the wavelength 632 nm), what should be the length of the laser cavity? Select one: a. L2 0.002 m b. L< 0.001 m с. L 2 0.001 m d. L < 0.002 m
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