Abstract
Optical parametric chirped-pulse amplification (OPCPA) provides an efficient route to push ultrafast pulses toward ultrahigh peak powers. However, in high average power regime, the unavoidable thermal effects in nonlinear crystals will intrinsically destroy the phase-matching (PM) condition, which fundamentally limit average power scaling. Here, we present a theoretical design of high average power OPCPA based on simultaneous temperature and wavelength insensitive PM. By regulating the temperature set for PM as well as the wavelength of interacting waves in lithium triborate crystal, the noncollinear angles for temperature insensitive PM and wavelength insensitive PM will coincide and thus ensures simultaneous temperature and wavelength insensitive PM condition. We investigate the performances of the proposed PM scheme in comparison with traditional wavelength insensitive noncollinear PM. Because of the larger temperature bandwidth, higher average power can be anticipated in OPCPA with the proposed PM scheme. Besides, the large spectral bandwidth also allows the amplification of sub-10 fs pulses in the visible spectral range. The proposed PM scheme will provide a promising approach in generating ultrashort pulses with high peak and average powers.
Highlights
Ultrafast lasers have shown a great potential in varieties of fields in science and technology [1]–[6]
Owing to the inherent thermal effects arising from energy storage in the gain media, the average power in chirped-pulse amplification (CPA) systems is generally restricted to tens of watts [10]–[12] and further power scaling becomes increasingly challenging
Based on a complete model by coupling the parametric amplification with the heat transfer process, we numerically investigate the performance of the proposed scheme in high average power optical parametric chirped-pulse amplification (OPCPA)
Summary
Ultrafast lasers have shown a great potential in varieties of fields in science and technology [1]–[6]. Future progress in strong-field physics [1], biology [2], micromaching [3] and material science [4] will rely on high-intensity lasers with pulse durations in femtosecond scale. Traditional Ti:sapphire-based chirped-pulse amplification (CPA) has paved the way to generate ultrashort pulses with high peak powers of 5 petawatt [7]. Ultrashort pulses combing high peak powers with high average powers have become a crucial prerequisite for revolutionizing ultrafast science [8], [9]. Optical parametric chirped-pulse amplification (OPCPA) has great potentials in improving average power because of the instantaneous nature of nonlinear parametric process [13]–[18].
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