Project description
Optoelectronic Assignment (1): Discrete Energy Systems
1.What are the three main matter-light radiative processes? Give the transition rates for these processes in discrete energy level systems and explain what each term represents. 6
2.Compare and contrast the physical characteristics of coherent and incoherent light. 4
3.What is population inversion and how is it achieved? Can population inversion be obtained in a two level system? 6
4.What is meant by the terms:
Pumping Threshold 2
Threshold Gain 2
Clamping 2
5.Derive the Round-Trip Gain condition and explain its importance. 8
6.What are longitudinal modes and what condition must be satisfied to obtain a resonant Fabry Perot cavity? 4
7.What are Transverse modes and what mode profile is usually required?4
8.State and explain the rate equations for a 4-level discrete energy level laser. Clearly explain what each term represents.8
9.Sketch the population inversion and the output power dependence of a gas laser with pumping. 4