A certain semiconductor laser diode has a length of 0.5 mm and has a high reflection coating on the back surface of the chip. The maximum current that can be applied to the device is 100 mA, at which point the gain coefficient is 5000 m-1. (i) Given that the natural reflectivity of the laser chip is 30%, show that the laser will operate even when the front surface is uncoated. (ii) Estimate the threshold current of the laser when it is operating with an uncoated front surface, stating clearly any assumptions you make.

A certain semiconductor laser diode has a length of 0.5 mm and has a high reflection coating on the back surface of the chip. The maximum current that can be applied to the device is 100 mA, at which point the gain coefficient is 5000 m-1. (i) Given that the natural reflectivity of the laser chip is 30%, show that the laser will operate even when the front surface is uncoated. (ii) Estimate the threshold current of the laser when it is operating with an uncoated front surface, stating clearly any assumptions you make.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter1: Atomic Structure

Section: Chapter Questions

Problem 6RQ: How many valence electrons are generally contained in materials used for insulators?

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