Femtosecond Laser Spectroscopy by Peter Hannaford

By Peter Hannaford

With contemporary significant breakthroughs in ultrafast laser expertise and femtosecond nonlinear spectroscopic techiques, Femtosecond Laser Spectroscopy is at present a burgeoning box in lots of branches of technology, together with physics, chemistry, biology, and fabrics technology. there's an pressing desire for researchers and postgraduate scholars to have a quantity consisting of the main learn efforts at the moment in perform worldwide and all lower than one cover.

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Figure 1-9 shows the cross-correlation measurement of the two stabilized mode-locked Ti:sapphire lasers using both sum (SFG) and difference frequency generation (DFG). The DFG signal produced by a GaSe crystal can be tuned from 6 micron and onto any longer wavelength regions with a high repetition rate (the same as that of the original laser) and a reasonable average power (tens of microwatts). Arbitrary amplitude waveform generation and rapid wavelength switching in these nonlinear signals are simple to implement.

If one uses a pair of phase-locked pulses, delayed by a time the resulting spectrum maintains the broad envelope of width but with a sinusoidal modulation of spectral period This width sets the new instrumental resolution. If one uses an infinite sequence of pulses, locked in phase and equally delayed in time by the interval the spectrum breaks up in a “comb” of very narrow lines (the “teeth”) equally spaced by a frequency interval bution are evident: this spectral comb can be used as a precise ruler to measure unknown frequency intervals in a relatively simple way.

Figure 1-4 illustrates the calculated population of the 5D states due to the two-photon transition, showing clear evidence of population transfer when the number of interacting pulses increases. Not surprisingly, the most dominant transition pathway when a large number of pulses is involved is which represents a so-called closed transition. The horizontal axis represents a scanning of from its nominal value indicated in the figure. The actual optical frequency for the two-photon transition is near 385 THz, which represents a harmonic order of of Therefore, a change in by ~ 26 Hz implies a repeat in 1.

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