Three-photon absorption in CaF2 at 248.5 nm

Tomie, Toshihisa; Okuda, I.; Yano, Masaaki

doi:10.1063/1.102417

Cited by 29 publications

(7 citation statements)

References 10 publications

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“…Preliminary results at the ArF laser wavelength yielded an a 0 value and an a 1 value of $0.1 cm À1 and $3 · 10 À3 cm/ MW, respectively [46,47]. Fig.…”

Section: Non-linear Absorptionmentioning

confidence: 95%

Ablation and compaction of amorphous SiO2 irradiated with ArF excimer laser

Awazu

2004

Journal of Non-Crystalline Solids

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“…Preliminary results at the ArF laser wavelength yielded an a 0 value and an a 1 value of $0.1 cm À1 and $3 · 10 À3 cm/ MW, respectively [46,47]. Fig.…”

Section: Non-linear Absorptionmentioning

confidence: 95%

Ablation and compaction of amorphous SiO2 irradiated with ArF excimer laser

Awazu

2004

Journal of Non-Crystalline Solids

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“…Band-gap energies in MgF 2 (11.6 eV) and LiF (11.8 eV) are too wide for direct two-photon absorption. Three-photon absorption was found to be a primary process in these materials, followed by linear absorption at color centers appeared in repetitive irradiations (see i.e., Simon & Gerhardt, 1989;Tomie et al, 1989;Hata et al, 1990). In our case, a quasicontinuous color centers formation during long-pulse KrF samples irradiation apparently increases resulting nonlinear absorption.…”

Section: Optical Properties Of Laser-driven Shock Tube Windowsmentioning

confidence: 63%

Planar shock waves in liquids produced by high-energy KrF laser: A technique for studying hydrodynamic instabilities

et al. 2008

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The paper is devoted to research and development of a novel experimental technique-liquid-filled laser-driven shock tube (LST) for modeling of Rayleigh-Taylor (RT) and Richtmyer-Meshkov (RM) hydrodynamic instabilities development at the contact surface of two immiscible liquids under shock wave (SW) passage. 100-J, 100-ns KrF laser facility GARPUN has been used to irradiate some opaque liquids. A homogenizing focusing system combined multi-element prism raster and a lens to provide non-uniformity less than a few percents across a square 7 Â 7-mm spot, laser intensities being varied in the range of q ¼ 0.004-2 GW/cm 2 . Surface plasma blow-off produced a planar SW, which propagated into the liquid. SW amplitudes as high as 0.8 GPa weakly damping with increasing thickness were measured in dibutyl-phthalate (DBP), which volumetrically absorbed ultraviolet (UV) laser light. Nonlinear absorption coefficients and laser breakdown thresholds were measured for pure water and UV optical materials intended to confine plasma. Test bench experiments were performed to produce standing acoustic waves as initial perturbations at the interface between two immiscible liquids.

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“…(c) The model of multiphoton losses assumes that the m-photon absorption cross-section is proportion to I m¡1 (I is the photon¯ux) and the absorption saturation for m 5 2 does not occur (for example [11,25]). In the practically interesting range of I values, both requirements are well satis®ed in excimer systems as a rule [11,26]. (d ) The model of radiation propagation in the cavity is essentially a onedimensional model (z and t variables); so it considers variations in the spatial distribution of radiation intensity along the cavity axis but does not consider directly variations in the transverse distribution of radiation intensity in the cavity (variables x and y).…”

Section: Basic Equations Of the Model Of A Short-pulse Rare-gas Halidmentioning

confidence: 99%

Modelling of short-pulse generation in rare-gas halide excimer lasers I. The model and its verification

Badziak

Jabłoński

1999

Journal of Modern Optics

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In part I of this paper, a comprehensive model of a short-pulse rare-gas halide excimer (RGHE) laser consisting of excimer systems with the ground state both unbound and bound is presented. It takes into account the most important fast relaxation processes occurring in the active medium, variable cavity losses programmed externally, practical layout of the cavity elements, and also nonlinear saturable and non-saturable absorption in the laser. General equations for a short-pulse RGHE laser as well as their simpli®ed variants for KrF and XeCl lasers are formulated. Good correspondence of the model to the results of numerous experiments described in the literature is demonstrated. In part II, the model will be applied in numerical investigations of short-pulse generation in KrF and XeCl lasers by fast mode locking using a square-wave-driven Pockels modulator.

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Three-photon absorption in CaF2 at 248.5 nm

Abstract: Nonlinear absorption at 248.5 nm is studied with an 8 ps pulse. Two-photon absorption in fused silica and three-photon absorption in CaF2 are observed. Absorption coefficients are 8×10−11 cm/W and 2×10−21 cm3 /W2 for fused silica and CaF2 , respectively.

Cited by 29 publications

References 10 publications

Ablation and compaction of amorphous SiO2 irradiated with ArF excimer laser

Ablation and compaction of amorphous SiO2 irradiated with ArF excimer laser

Planar shock waves in liquids produced by high-energy KrF laser: A technique for studying hydrodynamic instabilities

Modelling of short-pulse generation in rare-gas halide excimer lasers I. The model and its verification

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