Fiber&Laser&for&ERL& · PulseEnergy • Peak&power&es:mated&from&pulse&energy&and& characteris:cs&...
Transcript of Fiber&Laser&for&ERL& · PulseEnergy • Peak&power&es:mated&from&pulse&energy&and& characteris:cs&...
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Fiber Laser for ERL
Zach Ulibarri Mentor: Zhi Zhao
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Introduc:on • Goal: – Mode locked laser oscillator – 50 MHz repe::on rate
– Designed for emiEance measurement
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Laser Basics • Popula:on inversion in gain medium
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Laser Basics • S:mulated photon emission
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Laser Basics • Light emits and repeats process
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Mode Locked Lasers • Saturable absorber
Intensity
Transmission
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Mode Locked Lasers
• With saturable absorber in place, random noise can create pulses
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Mode Locked Lasers
• How do we add sufficient noise to the cavity?
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Mode Locked Lasers
• How do we add sufficient noise to the cavity?
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Ar:ficial Saturable Absorber • Wave plates create phase shiS induced intensity modula:on
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Experimental Setup
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Top View
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Mode Locked Lasers
19.8ns
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Mode Locked Lasers • Detector is too slow
FWHM suggests Pulse width = 1.22 ns
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Autocorrelator Measurement • Michelson interferometer creates small delay • Aligned pulses create second harmonic genera:on
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Intensity Autocorrela:on
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Intensity Autocorrela:on
FWHM suggests pulse width = 8ps. Very large!
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Chirp • Index of refrac:on depends on wavelength
• Compensate with diffrac:on gra:ng
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Chirp
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Intensity Autocorrela:on
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Dechirped Autocorrela:on
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Dechirped Autocorrela:on
FWHM = 330 fs = 1.5*220
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Interferometric Autocorrela:on
FWHM suggests pulse width = 220fs
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Spectrum
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Simulated Results
200fs
Agrees with es:mates
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Pulse Energy • Peak power es:mated from pulse energy and characteris:cs Chirped Dechirped
"↓$%&'( = *↓+,- // "↓$%&'( = *↓+,- //
= 20301/50.5∗ 10↑6 = 53.301/50.5∗ 10↑6
=1.0634 =4.0234
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Peak Power
*↓$(+5 = "↓$%&'( /6↓$%&'(
= 1.06 ∗10↑−9 /200∗10↑−15
=5.2851
*↓$(+5 = "↓$%&'( /6↓$%&'(
= 4.02 ∗10↑−9 /200∗10↑−15
=20.151
Chirped Dechirped
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Ques:ons?