Resulting in generation of waves with frequencies given by ? = �� 1 ?? 2 ?? 3 in addition to third-harmonic generation waves with ? = 3? 1, 3? 2, 3? 3.
42.
This is because in second-harmonic generation, only one input light beam is required, but if ? 1 ` " ? 2, 2 simultaneous beams are required, which can be more difficult to arrange.
43.
Nonlinear optics remained unexplored until the discovery in 1961 of second-harmonic generation by Peter Franken " et al . " at University of Michigan, shortly after the construction of the first laser by Theodore Harold Maiman.
44.
This is referred to as cross-correlation FROG or XFROG . In addition, other non-linear effects besides second harmonic generation may be used, such as third harmonic generation ( THG ) or polarization gating ( PG ).
45.
This is referred to as cross-correlation FROG or XFROG . In addition, other non-linear effects besides second harmonic generation may be used, such as third harmonic generation ( THG ) or polarization gating ( PG ).
46.
There are two processes that are commonly used to achieve the conversion : second harmonic generation ( "'SHG "', also called frequency doubling ), or sum frequency generation which sums two non-similar frequencies.
47.
The Leone s lab worked in partnership with Jun Ye in Boulder, DOE and the Center for X-Ray Optics with the support of an AFOSR MURO grant to study ultrafast soft X-Ray studies with high harmonic generation.
48.
Some advanced techniques ( involving high harmonic generation with amplified femtosecond laser pulses ) can be used to produce optical features with durations as short as 100 attoseconds in the extreme ultraviolet spectral region ( i . e . < 30 nm ).
49.
In the continuous wave regime, stable half-harmonic generation in an optical parametric oscillator was experimentally demonstrated in 1990, and in the mid-infrared frequency combs using near-infrared frequency combs, and a conversion efficiency of ~ 64 % is experimentally demonstrated.
50.
The MIIPS method is also based on second harmonic generation ( SHG ) in a non-linear crystal; however, instead of temporally scanning a replica of the pulse as in autocorrelation, a controllable and varying GDD is applied to the pulse through a pulse shaper.
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