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Unformatted text preview: 21.1Solutions Manual: Coldren & Corzine Chapter 2: Phenomen. Approach to Diode Lasers— 2.1:a) Internal efficiency is the fraction of injected carriers that generate carriers in the active region. Soto compute i/,, divide the carriers per time (current) that generate carriers in the active region by the totalcarriers per time:Current generating carriers in active region17, = Internal efficiency =—2—Total currentTJj = = 1 =b) The total loss is the mirror loss plus the internal modal loss. The differential efficiency is definedby Eq. 2.35. Combining these two definitions gives the following result:wheream= mirror loss andat<,tai —<*m4 < <*<>= total loss. Note that this assumes thatrjjincludespower coming out both facets. If power is only measured out one facet, then T/J =^a*™,,»7.Inr+lip + lit+c) The radiative efficiency is the fraction of carriers considered in part (a) that recombine radiatively.Below threshold, we can assumeI,f<CI,t •r,r=R"+R> t« ^i£ (2.6)R ,t+R ,7r «lip + In r +26 Solutions by R. Kehl SinkChapter 2: Phenomen. Approach to Diode LasersSolutions Manual: Coldren & Corzine 22.1'2.2:a) The volume of the reservoir is the product of the cross sectional area and the height. Since the areais constant, we can write the following:b) In steady state, dh/dt = 0. Using the result from part a, we can solve for the steady state height.Only the positive root of the quadratic equation is used since the height is positive., _2C2c) The area is not important. Use first the equation from part (b) above to solve for C2h2Solutions by R. Kehl Sink2723.1 Solutions Manual: Coldren fc Corzine2.3:Chapter 2: Phenomen. Approach to Diode LasersThe intrinsic cutoff frequency of an LED is the reciprocal of the time it takes (after the current is turned...
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This note was uploaded on 02/02/2011 for the course ECE 227A taught by Professor Coldren during the Spring '08 term at UCSB.
 Spring '08
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