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(Color online) (Top row) Quasi-phase-matching conditions for transverse SHG: [(a) and (b)] unidirectional frequency doubling (UDFD) and (c) counterpropagating frequency doubling (CPFD). (Middle row) Schematic representation of the transverse SH emission of counterpropagating pulses: The SH of both UDFD and CPFD are emitted in the plane. Arrows indicate the transverse direction of observation. (Bottom) Experimental setup: BS, beam splitter; M, mirror; L, cylindrical lens.
(Color online) Comparison of the counterpropagating pulse based correlator with a GRENOUILLE. (a) Camera picture of transverse SH trace of the pulse. (b) Black dots, SH profile from area marked in (a); solid line, autocorrelation calculated from GRENOUILLE measurement. (c) GRENOUILLE trace. (d) Pulse and phase profiles retrieved from GRENOUILLE giving .
(Color online) Detection of pulse front tilt and multipulse structures. (a) Optical system used to induce a pulse front tilt. [(b) and (c)] Autocorrelation traces of the tilted and straight front pulses. (d) Schematic of the generation of a pulse doublet by means of a birefringent crystal. (e) Autocorrelation trace of a doublet for delay between the two pulses.
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