Foundations of Materials Science and Engineering
Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 15.10, Problem 15KCP
To determine

Explain the process and use of the following types of lasers.

  • • (a) Neodymium YAG
  • • (b) Carbon dioxide
  • • (c) Double heterojunction GaAs.

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A laser contains a Ti:sapphire rod of length 5mm and composed of a material with n=1.76 and n2=1x10-19m2 w-1 The FWHM (intensity) beam diameter is 100µm, the average intra-cavity laser power is 8W, the pulse duration is 53fs and the pulse repetition frequency is 64MHZ. By considering the optical Kerr effect, by what distance (in nm) does the center of the beam lag behind the FWHM points after propagating the length of the rod?
Discussion 1- What the reason for the laser divergence? 2- Calculate the brightness of 3mw He-Ne laser and 1 cm in diameter? 3- The divergence of the laser beam after sending it through a telescope is 10 rad What is the diameter of the spot formed on the moon surface if the laser is directed towards the earth? (The distance from earth to the moon is (3.8 x10 km) (the laser beam diameter is 2mm).
2. A certain ruby laser emits 1J pulses of light whose wavelength is 694nm. What is the minimum Cr3* ions in the ruby? 1. In a laser unit laser beam of wavelength 6328Aº is emitted. How many photons are released per unit sec if the output power is 1mW

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