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Unformatted text preview: HW 9 ECE 716 Page 1 of 2 Autumn 2010 Homework 9 ECE 716 Autumn 10 Due Monday November 29 1. A Gaussian beam is emitted from a laser at Î» =1.55 Î¼ m. The beam waist spot size is 2Î¼m. We desire to couple it into a single-mode fiber whose fundamental mode is very close to Gaussian with a spot size of 5Î¼m. a) Of the three microscope objective lenses discussed in class, which provides the best coupling efficiency? b) Is a lens better than just butting the fiber directly against the fiber output? c) What if we wanted to couple a 5Î¼m beam into a fiber with a 2Î¼m mode? What is the best coupling efficiency obtainable now? 2. Using Jones calculus, find the polarization state and change in amplitude of light that starts out horizontally linearly polarized, and is passed through a) a linear polarizer oriented at +60Â° b) a quarter wave plate whose fast axis is parallel to the x axis c) a 45Â° polarizer followed by a quarter wave plate with its fast axis parallel to the x axis 3. Using Jones calculus, find the polarization state that results when right...
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- Fall '10
- Polarization, quarter wave plate