For the first time, with the use of I-scan and z-scan techniques, the five-photon absorption cross-section in a CaF 2 sample has been measured to be σ 5 = 5 × 10 −148 cm 10 s 4 at 473 nm. The applicability of the technique and the contribution to the measured absorption of an avalanche and tunnel ionization are discussed.

中文翻译：

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CaF 2在473 nm下的五光子吸收测量

首次使用I扫描和z扫描技术，在473°F下测量了CaF 2样品中的五光子吸收截面为σ5 = 5×10 -148 cm 10 s 4纳米 讨论了该技术的适用性以及对雪崩吸收和隧道电离的测量贡献。