1. With a He-Ne laser of wavelength 11.5x 10-7 m, fringes remain clearly visible whenthe path difference is increased up to 10 m. Calculate the coherence length, coherencetime and the spectral half width for He-Ne laser.-20at2. The relative population of atoms in two energy levels E1 and E2 is 10thermal equilibrium. Calculate the energy level difference in electron-volts. Assumetcmperature to be 300 K.3. A mercury vapour lamp emits in the green portion of electromagnetic spectrum ata wavelength of 546.1 nm with emission bandwidth of 6 × 10% Hz. Calculate thecoherence length for mercury vapour lamp.4. Calculate the coherence length for CO2 laser whose line width is 10emission wavelength of 10.6 µm.-5nm at IR

Given: The wavelength of light = 11.5 x 10-7 m Path difference = 10 m

1. 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, cohcrence time and the spectral half width for He-Ne laser. -20 2. The relative population of atoms in two energy levels E1 and E2 is 10- thermal equilibrium. Calculate the energy level difference in clectron-volts. Assume temperature to be 300 K. at 3. A mercury vapour lamp emits in the green portion of electromagnetic spectrum at a wavelength of 546.1 nm with emission bandwidth of 6 × 10$ Hz. Calculate the coherence length for mercury vapour lamp. 4. Calculate the coherence length for CO2 laser whose line width is 10-5 nm at IR. emission waveclength of 10.6 µm.

1. 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, cohcrence time and the spectral half width for He-Ne laser. -20 2. The relative population of atoms in two energy levels E1 and E2 is 10- thermal equilibrium. Calculate the energy level difference in clectron-volts. Assume temperature to be 300 K. at 3. A mercury vapour lamp emits in the green portion of electromagnetic spectrum at a wavelength of 546.1 nm with emission bandwidth of 6 × 10$ Hz. Calculate the coherence length for mercury vapour lamp. 4. Calculate the coherence length for CO2 laser whose line width is 10-5 nm at IR. emission waveclength of 10.6 µm.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question

1. 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.
-20
at
2. The relative population of atoms in two energy levels E1 and E2 is 10
thermal equilibrium. Calculate the energy level difference in electron-volts. Assume
tcmperature to be 300 K.
3. A mercury vapour lamp emits in the green portion of electromagnetic spectrum at
a wavelength of 546.1 nm with emission bandwidth of 6 × 10% Hz. Calculate the
coherence length for mercury vapour lamp.
4. Calculate the coherence length for CO2 laser whose line width is 10
emission wavelength of 10.6 µm.
-5
nm at IR

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