With a He-Ne laser of wavelength 11.5× 10-7 m, fringes remain clearly visible when the path difference is increased up to 10 m. Calculate the coherence length, coherence time and the spectral half width for He-Ne laser.

With a He-Ne laser of wavelength 11.5× 10-7 m, fringes remain clearly visible when the path difference is increased up to 10 m. Calculate the coherence length, coherence time and the spectral half width for He-Ne laser.

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter27: Wave Optics

Section: Chapter Questions

Problem 48P

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With a He-Ne laser of wavelength 11.5x 10-7 m, fringes remain clearly visible when
the path difference is increased up to 10 m. Calculate the coherence length, coherence
time and the spectral half width for He-Ne laser.

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