Three-photon absorption spectra of zinc blende semiconductors: theory and experiment

Cirloganu, Claudiu M.; Olszak, Peter D.; Padilha, Lázaro A.; Webster, Scott; Hagan, David J.; Stryland, Eric W. Van

doi:10.1364/ol.33.002626

Cited by 24 publications

(21 citation statements)

References 17 publications

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“…The decreased absorption in the indirect regimes is reasonable considering the need for phonon assistance in exciting carriers to the indirect valley. In addition, the less pronounced difference in the 3PA data may be attributed to the greater number of absorption pathways generally available in 3PA, as recently shown by Cirloganu et al 29 Previous works have reported the 2PA coefficient in Ge near 2.8 µm. These are listed in Table III, and are in the same range as our result.…”

Section: B Beam Propagation and Carrier Concentrationsmentioning

confidence: 81%

Multiphoton absorption in germanium using pulsed infrared free-electron laser radiation

et al. 2011

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We report wavelength-and intensity-dependent transmission measurements of intense mid-infrared radiation from the Vanderbilt Free Electron Laser in single-crystal Ge(100) in the wavelength range of 2.8-5.2 μm. This range accesses both the direct and indirect energy gaps in Ge, requiring in each case either two or three photons (2PA or 3PA) for absorption. Large changes in the multi-photon absorption rate are seen at the direct-to-indirect and 2PA-to-3PA transitions. Photon interactions are dominated by free carrier absorption (FCA), primarily due to holes. The entire absorption process is modeled with the two-and three-photon absorption coefficients (β and γ) as fitting parameters.Using newly measured values of the low-intensity FCA cross-sections, we find a best fit to the data at 2.8 µm that is in agreement with theory and previous measurements. We report a ratio of 175 for β across the direct-to-indirect transition, and a ratio of 5 across the same transition for γ. These ratios are independent of systematic variations in free carrier cross-sections and beam diameter. Receipt

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Section: B Beam Propagation and Carrier Concentrationsmentioning

confidence: 81%

Multiphoton absorption in germanium using pulsed infrared free-electron laser radiation

et al. 2011

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“…Surprisingly, this fifth-order NLO response is as large as the nonlinearities reported in previous studies that typically involve third-order χ (3) processes [5]. On an absolute scale, this effective χ (5) = 7.6 × 10 −15 (m/V) 4 is the largest ever reported, exceeding that obtained via electromagnetically-induced transparency (EIT) in a Bose-Einstein condensate by ∼ 10 5 [6], three-photon absorption in a zinc blend semiconductor by ∼ 10 22 [7], and local-field-induced microscopic cascading in C 60 by ∼ 10 25 [8].…”

Section: Introductionmentioning

confidence: 76%

Bunching-induced optical nonlinearity and instability in cold atoms [Invited]

Greenberg¹,

Schmittberger²,

Gauthier³

2011

Opt. Express

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Abstract:We report a new nonlinear optical process that occurs in a cloud of cold atoms at low-light-levels when the incident optical fields simultaneously polarize, cool, and spatially-organize the atoms. We observe an extremely large effective fifth-order nonlinear susceptibility of χ (5) = 7.6 × 10 −15 (m/V) 4 , which results in efficient Bragg scattering via six-wave mixing, slow group velocities (∼ c/10 5 ), and enhanced atomic coherence times (> 100 µs). In addition, this process is particularly sensitive to the atomic temperatures, and provides a new tool for in-situ monitoring of the atomic momentum distribution in an optical lattice. For sufficiently large light-matter couplings, we observe an optical instability for intensities as low as ∼ 1 mW/cm 2 in which new, intense beams of light are generated and result in the formation of controllable transverse optical patterns.

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“…8 is calculated for direct two-photon transition with the bandgap width E g 6.9 eV with the dependence α d 2 ≈ 2ξ − 1∕ξ 5 3∕2 , ξ ℏω∕E g [20]. However, the spectral behavior of the 3PA coefficient α 3 is different from that of the direct 3PA with expected [21,22,23] pronounced onset at E g ∕3 (photon energy 2.3 eV). As follows from Fig.…”

Section: Resultsmentioning

confidence: 98%

Two- and three-photon absorption in chemical vapor deposition diamond

et al. 2012

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We report on the nonlinear optical properties (absorption and refraction) of monocrystalline chemical vapor deposition diamond studied by photoluminescence and Z-scan measurements. The studied spectral interval 2.8-6.2 eV can be divided into three regions in which the one-, two-and three-photon absorption (1PA, 2PA, 3PA) dominate. We obtained the values of 2PA and 3PA coefficients of diamond (α 2 0.9 cm∕GW at 4 eV and α 3 2.3×10 −4 cm 3 ∕GW 2 at 3.1 eV) and of the nonlinear refractive index (8×10 −7 cm 2 ∕GW at 2.9 eV) for several irradiation photon energies. We interpret the measured spectral dependence of nonlinear absorption coefficients in terms of direct and indirect multiphoton absorption.

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Three-photon absorption spectra of zinc blende semiconductors: theory and experiment

Cited by 24 publications

References 17 publications

Multiphoton absorption in germanium using pulsed infrared free-electron laser radiation

Multiphoton absorption in germanium using pulsed infrared free-electron laser radiation

Bunching-induced optical nonlinearity and instability in cold atoms [Invited]

Two- and three-photon absorption in chemical vapor deposition diamond

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