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lect25 - Ultrafast Op cs 4.12.2011 Con nued in Fall 2011...

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Unformatted text preview: Ultrafast Op+cs 4.12.2011 Con+nued in Fall 2011: ECE 616 What is Ultrafast Op+cs? CW Laser Infinite +me 1 s Not Fast 1 x 10-3 Kinda fast 1 x 10-6 PreKy fast 1 x10-9 - 1 x10-15 ULTRAfast FWHM Ultrafast Op+cs Pulse Characteris+cs Pulse Shaping & Compression Pulse Propaga+on in Op+cal Fibers Linear & Non-Linear Op+cs Detec+on Pulse: Op+cal field of finite +me dura+on (as opposed to con+nuous) Temporal Vs. Spectral widths Uncertainty Principle Et h/2 ((0)2 v)/c Pulse Characteris+cs "Chirped Pulses" or Frequency Modula+on Instantaneous frequency is +me-varying Up-Chirp Down-Chirp Time-Varying Spectrum Pulsed Waves Pulse Shaping and Compression Chirp Filter Similar for down-chirped Ideal Filter Dispersion Compensa+on Fibers must propagate for large distances how to account for large dispersion? Applica+ons of Chirp Filters Chirp Pulse Amplifier Material Dispersion Spa+al Dispersion Polariza+on Dispersion Nonlinear Dispersion Bragg Gra+ng Chirp Filters Ultrafast Linear Op+cs Pulse Broadending Beam Spreading Possible through Ultrafast pulses Nonlinear Op+cs Con+nued in Fall 2012: ECE 616 Ultrafast Nonlinear Op+cs Only occurring in ultrafast pulses Extremely large intensi+es Walk-Off Effect Self Phase Modula+on (n2 is posi+ve) Supercon+nuum Light Source Many more... Pulse Detec+on Direct Photodetec+on Photodetector response +me must be much faster than the pulse Slow Detector, fast shuKer Single-Shot Pulse vs. Pulse Train Ultrafast Op+cs Pulse Characteris+cs Pulse Shaping & Compression Pulse Propaga+on in Op+cal Fibers Linear & Non-Linear Op+cs Detec+on Just an introduc+on learn more in ECE 615 & 616 ...
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