Theoretical analysis of noncollinear phase-matched optical parametric amplifier seeded by a white-light continuum

Experimental and theoretical analysis of white-light seeded, collinear phase-matching, femtosecond optical parametric amplifiers

“…[34][35][36] The retrieved intensity and phase of the white-light continuum were significantly different from the artificially created ones used in previous simulation efforts. [20][21][22]29 This result therefore justifies our effort to retrieve the actual white-light seeded signal pulse and using it in the simulation. Figure 5 shows a comparison of the experimental and the simulation results of the output idler pulses.…”

“…Pang et al 23 used a chirped super-Gaussian pulse for the white-light continuum. 22 As shown in Fig. 4, the actual white-light seed pulse is quite different from the artificial pulses mentioned above.…”

“…In other theoretical works, perfect phase matching was assumed and a special initial pulse shape was adopted. [20][21][22]29 The dichroic mirrors in the OPA system were also carefully considered in the calculation. It should be emphasized that optical properties of the optical components between amplification stages (DM2-DM4) strongly influence the output characteristics of the OPA system.…”

“…Numerical simulations that include material dispersion, field depletion, and other relevant effects have been performed for ultrafast OPA. [18][19][20][21][22] In particular, Bakker et al 18 presented a modified Runge-Kutta method and quantitatively studied the effects of group-velocity mismatch (GVM), phase mismatch, and field depletion on laser pulses in second-order optical processes. 18 Gale et al further incorporated groupvelocity dispersion (GVD) and third-order nonlinearities to compare their simulation results with experimental measurements.…”

Phase modulation conversion and conservation in optical parametric amplifier of femtosecond laser pulses

“…By applying a slowly varying amplitude approximation to Maxwell's equations, the second-order nonlinear interaction between three pulses can be described as follows (Pang et al 2001): where A s , A i and A p are the complex amplitudes of pump, signal and idler pulses, υ gs , υ gi and υ gp are the group velocities of pump, signal and idler pulses, d e f f is the effective second-order nonlinear coefficient of nonlinear crystal, k = k p − k s − k i is the phase mismatching and the z-axis is parallel to the wave vector. γ is the nonlinear effect coefficient.…”