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ECE227A_HW1_Solution_2010

ECE227A_HW1_Solution_2010 - tomography and many others 5 In...

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HOMEWORK 1 SOLUTIONS 1. The necessary elements of a laser cavity are two mirrors and a gain region. For single wavelength operation, a mode selection filter is also required. 2. To find the lasing wavelength, you need to find the mode with the largest gain. mλ = 2nL, assume n = 1, L = 1mm g = -1.25×10 15 cm -3 -1.55μm) 2 +10 4 cm -1 From the plot below, you can see that m = 1290 is closest to the gain peak, and has a wavelength of λ = 1.55039µm
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HOMEWORK 1 SOLUTIONS 3.
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HOMEWORK 1 SOLUTIONS 4. Some common applications of a laser diode are CD/DVD players, Blu-Ray Players, laser printers, bar-code scanners and laser pointers. Other applications are optical mice, LIDAR, pump lasers for Er-doped fiber amplifiers, optical coherence
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Unformatted text preview: tomography, and many others. 5. In solid state lasers, the energy levels of atoms are only slightly perturbed by the surrounding gas or host atoms, and remain effectively unchanged from the isolated atom. So, the emitted or absorbed photon needs to have a very specific energy. In diode lasers, the semiconductor materials are covalently bonded, and atomic levels of the atoms actually broaden into bands of allowed levels because of the perturbations from the nearby atoms, and the valence and conduction bands are formed. This gives a distribution of emitted photon energies....
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