Intensity and wavelength dependence of anisotropic nonlinear absorption inside MgO

Zhang, Yinfu; Huang, Tengfei; Li, Liang; Lan, Pengfei; Lu, Peixiang

doi:10.1007/s11082-021-02781-7

Cited by 5 publications

(8 citation statements)

References 42 publications

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“…The results of figure 6 clearly depict that in a wide intensity range exceeding three orders of magnitude before the laser damage threshold, the modulation amplitudes of orientation-dependent TPA in both ZnSe and GaP have obvious intensity dependence, with the maxima occurring around 10 11 W cm −2 . In general, our results confirm that the orientation-dependent TPA is directly linked with the ionic-bonding symmetrical characteristic of the specific crystal plane, which might be explained based on the theory of the anisotropic third-order optical nonlinearity [16][17][18] or the anisotropic SFI [5,[8][9][10][11][12]15]. Considering the significant intensity dependence of the third-order optical nonlinearity or SFI, it is intuitional to speculate that the modulation amplitude of orientation-dependent TPA should increase with the increase of irradiation intensity from the linear optical regime to the nonlinear optical regime, as predicted by some theoretical calculations [12].…”

Section: Resultssupporting

confidence: 83%

“…polarization [1][2][3][4] that is generally attributed to polarizeddependent field enhancement in the subwavelength structures and the crystal orientation with respect to laser polarization [5][6][7][8], which is generally attributed to the dependence of strong field ionization (SFI) probability on the crystal orientation. In addition to the crystal orientation dependence of laser-induced damage morphologies, a similar crystal orientation dependence for light transmission caused by SFI can also be observed below the laser damage threshold [9][10][11][12], indicating the crystal orientation dependence of the multiphoton absorption process (photon number n ⩾ 3 in [9][10][11][12]) in solids irradiated by polarized lasers. Furthermore, the high-order harmonics [13,14] or supercontinuum [15] generated by the strong laser irradiation of solids also exhibit significant crystal orientation dependence-these phenomena have essentially similar physical origins.…”

Section: Introductionmentioning

confidence: 77%

“…Golin et al [11] showed the intensity dependence of the modulation amplitude of orientation-dependent SFI transmission in GaAs using theoretical calculations and experiments. Zhang et al [12] obtained the positive intensity dependence of orientation-dependent nonlinear absorption of MgO. These studies display a strong intensity dependence for orientation-dependent nonlinear absorption (SFI), but the relationship trend between the modulation amplitude and the irradiation intensity is still not clear enough, in particular for the intensity regime approaching the laser damage threshold.…”

Section: Introductionmentioning

confidence: 99%

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Significant intensity dependence of anisotropic two-photon absorption in ZnSe and GaP

Ye¹,

Huang²

2023

Laser Phys.

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Using polarized femtosecond laser transmission measurements toward (100), (110), (111) ZnSe, and (100) GaP, we show that in a wide laser irradiation intensity range over two orders of magnitude before the laser damage threshold, a periodic amplitude modulation always appears clearly in the angle-dependent two-photon absorption (TPA) curves for (100), (110) ZnSe, and (100) GaP. It also exhibits a close connection between the orientation-dependent TPA and the ionic bonding symmetrical characteristics of specific crystal plane, thus revealing the origin of the orientation dependence of nonlinear absorption in the strong field laser-solid interaction. Interestingly, the modulation amplitudes of orientation-dependent TPA exhibit significant intensity dependence, with the maxima occurring around 1011 W cm−2. For the orientation-dependent nonlinear absorption in solids, such a nonmonotonic relationship between the irradiation intensity and the modulation amplitude has not been revealed previously in the near-damage-threshold regime by direct transmission measurements. In particular, with the intensity approaching the laser damage threshold, the significant descending trend of modulation amplitude confirms the consistent characteristics of saturation or even attenuation for the orientation dependence of TPA in the two crystals, which might be considered as a product of absorption saturation phenomenon of TPA at high irradiation intensity and would provide new understanding about the orientation-dependent TPA in the near-damage-threshold regime.

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Section: Resultssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

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Significant intensity dependence of anisotropic two-photon absorption in ZnSe and GaP

Ye¹,

Huang²

2023

Laser Phys.

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“…In this paper, we experimentally demonstrate a correlation between orientation-dependent ionization yields and the efficiency of HHG in various bulk crystals. We combine measurements of the angular dependence of nonlinear absorption (also referred to as multiphoton crystallography , ) and angle-dependent HHG efficiencies to establish a direct link between the excitation of quasi-free carriers and the emission of high-order harmonics. We identify an unambiguous connection between intense HHG emission and strong ionization for distinct orientations in various oxide and fluoride crystals.…”

Section: Introductionmentioning

confidence: 99%

Linking High-Harmonic Generation and Strong-Field Ionization in Bulk Crystals

Juergens,

Roscam Abbing,

Mero

et al. 2024

ACS Photonics

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The generation of high-order harmonics in bulk solids subjected to intense ultrashort laser pulses has opened up new avenues for research in extreme nonlinear optics and light− matter interaction on subcycle time scales. Despite significant advancement over the past decade, a complete understanding of the involved phenomena is still lacking. High-harmonic generation in solids is currently understood as arising from nonlinear intraband currents, interband recollision, and ionization-related phenomena. As all of these mechanisms involve or rely upon laserdriven excitation, we combine measurements of the angular dependence of nonlinear absorption and high-order harmonic generation in bulk crystals to demonstrate the relation between high-harmonic emission and nonlinear, laser-induced ionization in solids. An unambiguous correlation between the emission of harmonics and laser-induced ionization is found experimentally, which is supported by numerical solutions of the semiconductor Bloch equations and an analytical model of orientation-dependent ionization rates using maximally localized Wannier functions.

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“…In this article we experimentally demonstrate a correlation between orientation-dependent ionization yields and the efficiency of HHG in various bulk crystals. We combine measurements of the angular dependence of nonlinear absorption (also referred to as multiphoton crystallography [32,33]) and angle-dependent HHG efficiencies to establish a direct link between the excitation of quasifree carriers and the emission of high-order harmonics. We identify an unambiguous connection between intense HHG emission and strong ionization for distinct orientations in various oxide and fluoride crystals.…”

Section: Introductionmentioning

confidence: 99%

Linking High-Harmonic Generation and Strong-Field Ionization in Bulk Crystals

Jürgens¹,

Abbing²,

Mero³

et al. 2023

Preprint

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The generation of high-order harmonics in bulk solids subjected to intense ultrashort laser pulses has opened up new avenues for research in extreme nonlinear optics and light-matter interaction on sub-cycle timescales. Despite significant advancement over the past decade, a complete understanding of the involved phenomena is still lacking. High-harmonic generation in solids is currently understood as arising from nonlinear intraband currents, interband recollision and ionization-related phenomena. As all of these mechanisms involve or rely upon laser-driven excitation we combine measurements of the angular dependence of nonlinear absorption and high-order harmonic generation in bulk crystals to demonstrate the relation between high-harmonic emission and nonlinear, laser-induced ionization in solids. An unambiguous correlation between the emission of harmonics and laser-induced ionization is found experimentally, that is supported by numerical solutions of the semiconductor Bloch equations and calculations of orientation-dependent ionization rates using maximally localized Wannier-functions.

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Intensity and wavelength dependence of anisotropic nonlinear absorption inside MgO

Cited by 5 publications

References 42 publications

Significant intensity dependence of anisotropic two-photon absorption in ZnSe and GaP

Significant intensity dependence of anisotropic two-photon absorption in ZnSe and GaP

Linking High-Harmonic Generation and Strong-Field Ionization in Bulk Crystals

Linking High-Harmonic Generation and Strong-Field Ionization in Bulk Crystals

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