LASER
14
Nyru; vd;why; vd;d?
description
Nyru; vd;why; vd;d?. LASER. L – LIGHT A – AMPLIFICATION S – STIMULATED E – EMISSION R - RADIATION. L A S E R. L A S E R. LIGHT AMLIFICATION OF STIMULATED EMISSION OF RADIATION vd;gJjhd; Nyru; vd;gjd;; tpupthf;fk;. mjhtJ> - PowerPoint PPT Presentation
Transcript of LASER
Nyru; vd;why; vd;d?
L A S E R
LIGHT AMLIFICATION OF STIMULATED EMISSION OF RADIATION
vd;gJjhd; Nyru; vd;gjd;; tpupthf;fk;.mjhtJ>“fjpu;g;Gfspd; Cf;fpa fhyyhy; Vw;gLj;jg;gLk; xspg;ngUf;fk;” vd;gJ ,jd; nghUshFk;.
mUl;lg;gl;l epiyapYs;s mZnthd;W me;epiyapypUe;J Fiwe;jNthu; rf;jp epiyf;F khWk;NghJ xspaiynahd;W fhyg;gLk;. ,g;gbahff; fhyg;gl;l mjpf njhifahd miyfspd; $l;lNk xspf;fjpuhFk;.
rhjhuz xspf;fjpu; xd;W ,yl;rf;fzf;fhd jdpg;gl;l xspaiyfis cilajhf ,Uf;Fk;. ,j;jifa xspaiyfs; xUq;fpizAk;NghJ mf;fw;iwapd; nrwpT mNjasT jdpg;gl;l xspaiyfis cila rhjhuz xspf;fjpupd; nrwptpYk; ,yl;rk; klq;F mjpfkhdjhf ,Uf;Fk;. xUq;fpiztdthd xspaiyfis mZf;fs; fhYtjw;F Cf;fg;gLj;Jk; nraw;ghl;bd; tpisNt “Nyru; fjpu;fshFk;.”
E0
E1E’3
E’2
E’0
20.61eV
1.96eV
20.66eV18.70eV
He Ne
1958 - Arthur L. Schalow and Charles H. Townes invent the laser and publish a paper title “Infared and Optical Masers”
1961 - First continuous operation of an optically pumped solid state laser
1963 - Quantum well laser first suggested by H.Kroemer from the U.S. and Kazrinov and Alferov from the Soviet Union.
1975 - First quantum well laser operation made by J.P. Van der Ziel, R, Dingle, R.C Miller, W. Wiegmann, and W.A. Nordland, Jr.
1977 - R.D. Dupuis, P.D. Dapkus, N. Holonyak submitted paper demonstrating first quantum well injection laser
1994 - Quantum cascade lasers first developed
“LASER”
