Femtosecond two-photon absorption phase change spectroscopy of a ZnSe single crystal
| Autor: | Khos-Ochir Tsogvoo, Baatarchuluun Tsermaa, Kim Myung-Whun, Byung Kwan Yang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
business.industry Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Two-photon absorption Atomic and Molecular Physics and Optics Pulse (physics) 010309 optics Optics Phase (matter) 0103 physical sciences Femtosecond Atomic physics 0210 nano-technology Spectroscopy Absorption (electromagnetic radiation) business Refractive index Phase modulation |
| Zdroj: | Optics letters. 44(10) |
| ISSN: | 1539-4794 |
| Popis: | We measured time- and frequency-resolved phase changes owing to two-photon absorption induced by ultrashort (10 fs) pulses transmitted through a transparent material (ZnSe crystal), using femtosecond two-photon phase change spectroscopy. The maximal phase change was 0.02 rad when a pulse with the energy density of 1.5 nJ was focused with the focus diameter of 100 μm. The maximal phase change occurred when a probe pulse was delayed with respect to a pump pulse by 64 fs. A calculation assuming two-photon absorption by noninteracting atomic gases was consistent with the experimental observations, which supported the observed phase change of the pulse that is due to the two-photon absorption. |
| Databáze: | OpenAIRE |
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