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The two-photon absorption coefficient of germanium at 2.05 µm is (40 ± 8) cm/GW at low intensity, with a slight decrease at higher intensities likely caused by saturation. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

May 6, 2026Optical Materials Express0 citationsOpen Access

Two-photon absorption of germanium measured by z-scan at 2.05 µm

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MPMarcin Piotrowski DDDr Subhasis Das MBMartin BöckMax-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy

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Abstract

Two-photon absorption (TPA) measurements are performed on Ge using an open-aperture z-scan setup with 2.05 µm, 0.57 ps pulses from a Ho:YLF regenerative amplifier to resolve discrepancy issues from previous studies using different methods. Uncoated and antireflection-coated Ge samples are compared. The derived TPA coefficient at low intensity is determined to be (40 ± 8) cm/GW while the weak trend of decreasing TPA with intensity is likely due to saturation.

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Two-photon absorption of germanium measured by z-scan at 2.05 µm

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