EE 231 Optical Electronics, Fall 2003 EE231 Optical Electronics - Class outline Class website: http://www.cse.ucsc.edu/classes/ee231/Fall03/ Instructor: Claire Gu, BE 253B, [email protected]Lecture: Tue/Thu 10-11:45, Stevenson 221 Office hours: Wed 2-4 pm Homework: bi-weekly Grading policy: C ourse Elem ent Percentage H om ework 20 Midterm 20 Project/Term Paper 30 Final 30 Total 100
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EE 231 Optical Electronics, Fall 2003 EE231 Optical Electronics - Class outline Class website: Instructor:
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EE 231 Optical Electronics, Fall 2003
EE231 Optical Electronics - Class outline
• Class website: http://www.cse.ucsc.edu/classes/ee231/Fall03/
• spectrally broad• divergent• can’t be focused tightly• not very intense• incoherent
• very monochromatic• does not diverge as fast• can be focused tightly• can be extremely intense• spatial coherence (interference)• temporally coherent (beat notes)
What is needed ?
More generally:
• active medium• pump -> far from thermal equilibrium• feedback (resonator, mirrors)
EE 231 Optical Electronics, Fall 2003
Laser characteristics II -Threshold
kink inoutput power
spectral narrowing
EE 231 Optical Electronics, Fall 2003
Laser history
1910 1920 1930 1940 1950 1960 1970 1980 1990 2000
Einstein predictsstimulated emission
Townes invents and builds first MASER
Schawlow and Townes propose LASER
Maiman builds first (ruby) LASER
Javan inventsHe-Ne laser
Faist builds quantumcascade laser
Nakamura builds blue laser diode
nanowire laser builtat UCB
Alferov builds first heterostructure laser
CD playerIBM builds first laser printerHall buildssemiconductor laser