Physics · Optics and Lasers
A continuous He-Ne laser beam (λ = 632.8 nm) is 'chopped' using a spinning aperture into 1 μs square pulses. The order-of-magnitude estimate of the spectral width Δλ of the emerging pulsed light is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 110-18 m
- 210-15 m
- 310-12 m✓
- 410-9 m
Correct answer
10-12 m
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