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第14講 Amplifiers and Lasers

L14_A
          Transitions
          Stimulated emission
          Stimulated emission <-> Gain
          Gain needs pump
          Calculating the gain: Einstein A,B coefficients

 
L14_B
          Amplification: gain
          Population inversion
          Inversion: pumping the gain medium
          Different gain media
          Rate equations for a two-level system
          Two-level system does not give gain
 
L14_C
          Rate equations for a three-level system
          Three-level system: gain possible
          Rate equations for a four-level system
          Four-level system: gain easy
          Two-, three-, and four-level systems
 
L14_D
          LASER
          What does cavity do?
 
L14_E
          Cavity gives longitudinal modes
          Single-mode laser operation
          Types of Lasers
          Laser spectrum
          The Helium-Neon Laser
          Ion Lasers
          Dye lasers
          Titanium:Sapphire (Ti:S)
          Diode Lasers
          Two major type of LD
          Some everyday applications of diode lasers
          Fiber lasers
          LASIK
          Laser micro-machining

 

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