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OPTI 380A Lab 1 Semiconductor Light Sources - Prelab Study Guide-1

# OPTI 380A Lab 1 Semiconductor Light Sources - Prelab Study Guide-1

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OPTI 380A Lab 1: Semiconductor Lasers I Prelab Study Guide Use this Study guide to prepare for the laboratory and for Mini Quizzes (1) Draw a LI curve of a semiconductor laser. Label the axis and location of the laser threshold. What is the typical semiconductor laser threshold of an NEC laser diode? (2) You inject a 100mA current into a semiconductor laser. This current can be converted to number of injected electron per second (1 A is 1 Coulomb per second and 1 electron is 1.6x10 -19 Coulomb). How many electrons are you injecting into the semiconductor per sec? A photon is emitted when an electron and a hole are combined. If we assume that the laser is above threshold and that 80% of the electron and hole are recombined to emit as light. How many photons

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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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OPTI 380A Lab 1 Semiconductor Light Sources - Prelab Study Guide-1

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