By Rick Trebino
The Frequency-Resolved Optical-Gating (FROG) procedure has revolutionized our skill to degree and comprehend ultrashort laser pulses. This ebook includes every thing you must recognize to degree even the shortest, weakest, or most complicated ultrashort laser pulses. no matter if you are an undergrad or a complicated researcher, you will find easy-to-understand descriptions of the entire key principles at the back of the entire FROG recommendations, the entire useful information of pulse size, and plenty of new instructions of research.
This e-book isn't like several different clinical booklet. it's a vigorous dialogue of the elemental recommendations. it's a complicated therapy of research-level issues.
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Extra info for Frequency-Resolved Optical Gating: The Measurement of Ultrashort Laser Pulses
50 Frequency (1IIs) Fig. 4: Left: A pulse whose phase has not been phase-unwrapped. Right: The same pulse after phase-unwrapping. Note the different phase scales in each plot. The solution to this aesthetics problem is to phase-unwrap. It involves adding or subtracting the appropriate number of multiples of 2n to the phase at each discontinuity, so that it remains continuous over its entire range. This yields much prettier phases, but the price you pay is the need for a phase-unwrapping routine, which makes these decisions.
This is what we've been doing, but we haven't explicitly used this fact; now we will.
This way, there's only one possible phase that yields a given pulse (once the intensity is determined). This is the method you'll be implementing if you simply ask your computer to compute the phase, given the real and imaginary parts of the pulse using Eqs. 12). The problem with this approach is that, well, it's ugly. When the phase exceeds 2iT, it jumps to zero, and a great big discontinuity opens up in the phase. See Fig. 4. And this can happen many times over the pulse's life. 8 2. 2 ~ 1/ Intensity Phase - , ,; " , ; 'I 'I 1/1'1'1 " , " ',.
Frequency-Resolved Optical Gating: The Measurement of Ultrashort Laser Pulses by Rick Trebino