Question

2. Explain how do you realize in the case of a diode laser design (a) population inversion (b) amplification by stimulated emission and (c) an optical resonator to enhance the photon flux and (d) how do you minimize the absorption of photons so that stimulated emission dominates. Please explain with appropriate schematic diagrams where applicable.

Answer 1

(A〉The concept i spre tty "much ·šimple how Ehe name S at thei omal states cwold have meyt Eheiy atoms o mlecles at he onod state when an additiohal energy enteys Eh system, mabe in the form of the aht stati excie to the level ot higher enery i ta Invere sionTs s a Common phenomenon NORMAL DÍSTRI BUTTON 0- Cu

(b) Amplification by stimuhted emision2 This the step where, an external energy Source en tev's the System and Ehe atom ate excited to Ehe UPPe energ9 leVe by LJay how the popalation inveYSin happe ,The atons doesm't sta thee for long in the highey enerevThey Come do o Ehei old Around energeve csith the 丫elease of ab,oi bed energy. Thus thi Jtimu lation ofeneYay. Be fore emiwin Emission Gxcited inliden Photon evi

c) optiCal esonatos to enhance Photon elux make the ntesity the beam gieater .MİS happenう with a Pa iv of oninom on boti the en the lesev setup facing each other. the ight hichs emittea bthe loser is "made to ǒ.lect insongh khese. mivos They seflect the beams bnck and fath, causing an ovevb- the beam, thus by İniveaAing the inteusity of the beam, thus anpl:cation a place ith opticl reflecting and the other side of the "m: wauld be etiaxeflkct the in tense beams toPs Ehrough when tey Soiu to,which alous axe uificienti amplified Fally partiall Silvered silvered a Sey beam

(d) Hinim;sing absovption of photon ini'miづing the ab3,0Yption of the. Photon) Cam be done b vsing Ehe tht bee sed with a Proety of lem Photons absoyption Should have aPopes ty such Eat, Ehe. exci tation eney sayo very les time, so that the Popu lationne.sion and the. stimuated emision happen aic duar he proles.Geneyally se ods are been The mateytal Use in ye Coated sith othey naterial fo bettex ani invers ion and sti abted oPula t o