HW10 - EE 119 Homework 10 Professor: Jeff Bokor TA: Xi Luo...

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EE 119 Homework 10 Professor: Jeff Bokor TA: Xi Luo Due Tuesday , April 27 th 2010 (Please submit your answers in EE119 homework box located in 240 Cory Hall) 1. Diode Lasers Consider a InGaAsP-InP laser diode which has an optical cavity of length 250 microns. The peak radiation is at 1550 nm and the refractive index of InGaAsP is 4. The optical gain bandwidth (as measured between half intensity points) will normally depend on the pumping current (diode current) but for this problem assume that it is 2 nm. (a) What is the mode integer m of the peak radiation? (b) What is the separation between the modes of the cavity? (c) How many modes are within the gain band of the laser? (d) What is the reflection coefficient and reflectance at the ends of the optical cavity (faces of the InGaAsP crystal)? (c) The beam divergence full angles are 20 ° in y-direction and 5 ° in x-direction
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HW10 - EE 119 Homework 10 Professor: Jeff Bokor TA: Xi Luo...

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