Vacuum Ultraviolet Reflection Spectra of KDP and ADP

Saito, Shiori; Wada, Ken'ichi; Onaka, Ryumyo

doi:10.1143/jpsj.37.711

Cited by 81 publications

(41 citation statements)

References 10 publications

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“…With a further increase in h to 9.3 eV, the efficiency of excitation of the 4.7 eV PL band decreases by more than a factor of 10, remaining at this level up to h =22 eV. Saito et al (1974) showed that the energy range from 8.5 to 9 eV corresponds to the beginning of interband transitions in ADP. Fig.…”

Section: Resultsmentioning

confidence: 93%

“…At temperatures below the Curie point, the electronic structure of ADP and KDP crystals is determined mainly by the anionic H 2 PO 4 group. Saito et al (1974) and Stasyuk and Stetsiv (1991) showed that the upper occupied molecular orbitals of this anionic group, whose energy positions correspond to the top of the valence band of ADP and KDP, are formed from almost pure 2p oxygen orbitals, while the lowest unoccupied orbitals, corresponding to the bottom of the conduction band, are formed of 1s hydrogen orbitals. The electronic transition with the lowest energy in the H 2 PO 4 group is due to the transfer of an electron between these levels.…”

Section: Resultsmentioning

confidence: 99%

“…The electronic transition with the lowest energy in the H 2 PO 4 group is due to the transfer of an electron between these levels. Baldini et al (1972) and Saito et al (1974) suggested an excitonic origin of the low energy tail of the FA band of ADP and KDP. Lowtemperature experiments revealed self-trapping of holes with formation of [H 2 PO 4 ] 0 -radicals (so-called B-radicals) in ADP and KDP crystals (Diéguez et al, 1984;Stevens et al, 1999).…”

Section: Resultsmentioning

confidence: 99%

“…The low energy tails of fundamental absorption (FA) of KDP and ADP are located at 180 nm in the vacuum ultraviolet (VUV) spectral range. Therefore, despite the long-term investigations and wide practical application of KDP and ADP, only a few works are known (Baldini et al, 1972;Saito et al, 1974) in which these materials were studied by the means of the optical VUV spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

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Luminescence of the hydrogen bonded crystals

Огородников¹,

Kirm

Пустоваров³

2007

Radiation Measurements

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A complex investigation of the dynamics of electronic excitations in the hydrogen bonded crystals of potassium and ammonium dihydrophosphates-KH 2 PO 4 (KDP) and NH 4 H 2 PO 4 (ADP)-is performed by the means of the low-temperature time-resolved vacuum ultraviolet (VUV) optical luminescence spectroscopy with subnanosecond time resolution and with selective photoexcitation by synchrotron radiation. For KDP and ADP crystals, data on the kinetics of the photoluminescence (PL) decay, the time-resolved PL spectra (2-6.2 eV), and the time-resolved excitation PL spectra (4-24 eV) at 8 K were obtained. The intrinsic character of the PL of KDP (5.2 eV) and ADP (4.7 eV), which is caused by the radiative annihilation of self-trapped excitons (STEs), is ascertained. Possible channels of generation and decay of relaxed and unrelaxed electronic excitations in KDP and ADP crystals are discussed.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Luminescence of the hydrogen bonded crystals

Огородников¹,

Kirm

Пустоваров³

2007

Radiation Measurements

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“…Up till now, calculations of separated groups H n PO 4 (n=0,1,...,4) electronic spectra have been presented [13,14,15]. The obtained [14,15] spectra were used to calculate the contribution of H n PO 4 groups to the refractive index and the gyration effect.…”

Section: Introductionmentioning

confidence: 99%

Band Electron Spectrum and Optical Properties of KDP-Crystals Under the External Hydrostatic Pressure

Stetsiv¹

1999

Condens. Matter Phys.

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The electron spectrum of the KDP-type crystals has been investigated as a function of the external hydrostatic pressure using the tight-binding approximation. The joint density of electron states, real and imaginary parts of the dielectric permeability, refraction indices, the gyration coefficient, absorption and reflection coefficients for different polarizations of light are determined. Their pressure and frequency dependencies are investigated. The results are discussed by comparing them with the experimental data on piezooptic coefficients. The anomalous behaviour of the optical constants at the pressure p ≃ 17 kbar is due to the transformation of the hydrogen bond potential from a double minimum one to a single minimum one, where the proton is localised at the midpoint of the hydrogen bond.

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Nonlinear Optical and Laser Damage Properties of KDP Crystal with Trace Impurities in Bulk

Wen

Geng

Wang

et al. 2018

Crystal Research and Technology

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Small-sized potassium dihydrogen phosphate (KDP) samples cut from the pyramid sector of a large KDP boule are observed to have different impurity content. The nonlinear absorption properties of two KDP samples containing different impurities are characterized by Z-scan technique with picosecond laser at 355 nm wavelength. Reverse saturable absorption effects are found in samples, with nonlinear absorption coefficients of 7.35 × 10 −2 cm GW −1 and 15.91 × 10 −2 cm GW −1 . The sample with more impurity contents exhibits stronger nonlinear absorption. Such behavior is considered to be a result of nonlinear energy coupling under 355 nm laser irradiation assisted by impurity defects. Nanosecond laser-induced damage test at 355 nm of the two KDP samples is further investigated. The bulk damage thresholds of the two samples are 4.7 and 0.423 J cm −2 respectively, indicating that impurity-induced nonlinear absorption might play an important role in laser-induced damage processes.

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Vacuum Ultraviolet Reflection Spectra of KDP and ADP

Cited by 81 publications

References 10 publications

Luminescence of the hydrogen bonded crystals

Luminescence of the hydrogen bonded crystals

Band Electron Spectrum and Optical Properties of KDP-Crystals Under the External Hydrostatic Pressure

Nonlinear Optical and Laser Damage Properties of KDP Crystal with Trace Impurities in Bulk

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