Line Sources produce few discrete wavelengths D2 lamp or Hg/Xe arc-lamp (>400 nm) Atomic emission hollow cathode lamp (a)electron bombardment of cathode (b)sputtering of cathode atoms (c)emission from electronically excited cathode atoms Hollow Anode cathode Quartz Glass Ne or Ar or Pyrex shield at 1-5 torr window Fig.9-11 Electrodeless discharge lamps(EDL) (a)Ar ions created by RF energy(b)ions collide with gaseous metal atoms which then (c)emit excite (Fig.9-12) RF coil Quartz window CEM 333 page 3.6
Line Sources produce few discrete wavelengths D2 lamp or Hg/Xe arc-lamp (>400 nm) Atomic emission hollow cathode lamp (a) electron bombardment of cathode (b) sputtering of cathode atoms (c) emission from electronically excited cathode atoms Fig. 9-11 Electrodeless discharge lamps (EDL) (a) Ar ions created by RF energy (b) ions collide with gaseous metal atoms which then (c) emit excite (Fig. 9-12) CEM 333 page 3.6
Laser Light Amplification by Stimulated Emission of Radiation (a)pumping of excited state (b)stimulated emission to produce emission (Fig.7-5) (1) (2) (3) 去去Hea Pumping energy E E Excitation Partial relaxation Metastable excited state (a)Pumping (excitation by electrical,radiant,or chemical energy) (2) (3) =E-E (b)Spontaneous emission (2) (3 (c)Stimulated emission CEM 333 page 3.7
Laser Light Amplification by Stimulated Emission of Radiation (a) pumping of excited state (b) stimulated emission to produce emission (Fig. 7-5) CEM 333 page 3.7
Population Inversion and Amplification: Stimulated emission Absorption Ey Light attenuation by absorption ●●● -Ex (a) Ey Light amplification by stimulated Stimulated emission emission Absorption 6 Fig 7-6 CEM 333 page 3.8
Population Inversion and Amplification: Fig 7-6 CEM 333 page 3.8