HW9 - EE 119 Homework 9 Professor: Jeff Bokor TA: Xi Luo...

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EE 119 Homework 9 Professor: Jeff Bokor TA: Xi Luo Due Tuesday , April 20 th 2010 (Please submit your answers in EE119 homework box located in 240 Cory Hall) 1. A laser consists of two nearly perfectly reflecting mirrors, M, and a gain medium, G, of bandwidth Δ f centered at f 0. (a) What are the allowed frequencies for laser operation in this optical cavity? Express you answer in terms of τ, the time takes light to make one round trip in the cavity. (b) If it is desired to produce a pulse of one picosecond (10 -12 sec) duration at a wavelength of 6000 Å, what bandwidth Δ f is required? [Hint: Use uncertainty principle Δ f ×Δ t~1] What is the corresponding band of wavelengths? And how many laser modes would this involve? (Let L=1.5 m) G L Figure 1 2. Identify each of the following broadening mechanisms as homogeneous or inhomogeneous. Explain your answer. (a) Collisions between atoms in a gas (b) Randomly spaced impurities in a semiconductor crystal
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HW9 - EE 119 Homework 9 Professor: Jeff Bokor TA: Xi Luo...

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