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Unformatted text preview: are emitted per second? What is the output light power if the wavelength is 670nm? (3) Does the laboratory LED or LD have higher radiance? Why? (4) Draw the far field pattern of a typical NEC NDL3220 semiconductor laser. How do you convert this to a circular Gaussian beam? (5) A NEC diode has a beam divergence of 8 deg in one direction and 30 deg in the perpendicular direction. What is the minimum numerical aperture of a lens that can be used to collimate the output of the diode without appreciable clipping of the beam? (6) The output spectrum of a laser diode is shown below. Why are multiple peaks present in the spectrum, and what does each peak represent? OPTI 380A Lab 1: Semiconductor Lasers I...
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This document was uploaded on 10/30/2010.
- Spring '09