Diode-pumped, self-stimulating, passively Q-switched Nd3+:PbWO4 Raman laser

Chen, Weibiao; Inagawa, Yuji; Omatsu, Takashige; Tateda, Mitsuhiro; Takeuchi, Nobuo; Usuki, Y.

doi:10.1016/s0030-4018(01)01148-8

Cited by 128 publications

(58 citation statements)

References 10 publications

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“…Phonon hardening upon entering the multiferroic phase may turn out to be a characteristic property of magnetoelectric multiferroics of spin-spiral type. In contrast to previous reports on MnWO 4 or slightly doped Mn 1−x A x WO 4 , we do not find any anomalies above 20 K. We conclude that spin-lattice coupling in MnWO 4 is only small.…”

Section: Discussioncontrasting

confidence: 99%

“…The range of possible applications is very broad, including (phonon-) scintillation detectors, laser waveguides, laser crystals, and photocatalysis. [1][2][3][4][5][6] The compound MnWO 4 , also known from nature as mineral hübnerite, belongs to the class of multiferroics, displaying a coexistence of antiferromagnetic and ferroelectric order parameters. [7][8][9] The Mn 2+ ions are in a high-spin 3d 5 configuration with spin S = 5/2.…”

Section: Introductionmentioning

confidence: 99%

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Infrared-active phonon modes in monoclinic multiferroicMnWO4

et al. 2014

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We report on polarized infrared reflectivity measurements of multiferroic, monoclinic MnWO4 between 10 K and 295 K. All five non-vanishing components of the dielectric tensor have been determined in the frequency range of the phonons. All infrared-active phonon modes (7 Au modes and 8 Bu modes) are unambiguously identified. In particular the strongest Bu modes have been overlooked in previous studies, in which the monoclinic symmetry was neglected in the analysis. The combined analysis of reflectance data measured in different experimental geometries (Rac and Rp) is particularly helpful for a proper identification of the Bu modes. Using a generalized Drude-Lorentz model, we determine the temperature dependence of the phonon parameters, including the orientation of the Bu modes within the ac plane. The phonon parameters and their temperature dependence were discussed controversially in previous studies, which did not include a full polarization analysis. Our data do not confirm any of the anomalies reported above 20 K. However, in the paramagnetic phase we find a drastic reduction of the spectral weights of the weakest Au mode and of the weakest Bu mode with increasing temperature. Below 20 K, the parameters of the Au phonon modes for E b show only subtle changes, which demonstrate a finite but weak coupling between lattice dynamics and magnetism in MnWO4. A quantitative comparison of our infrared data with the quasi-static dielectric constant ε b yields a rough estimate for the oscillator strength ∆εem 0.02 of a possible electromagnon for E b. Furthermore, we report on a Kramers-Kronig-consistent model which is able to describe non-Lorentzian line shapes in compounds with monoclinic symmetry.

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Section: Discussioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Infrared-active phonon modes in monoclinic multiferroicMnWO4

et al. 2014

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“…Moreover, it is promising as a laser active medium [3]. The luminescence properties of this material therefore have been studied intensively by many authors [4].…”

Section: Introductionmentioning

confidence: 99%

Urbach Rule in PbWO4

Itoh

Yokota

Horimoto

et al. 2002

phys. stat. sol. (b)

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PACS: 71.35.Cc; 78.40.Ha The fundamental absorption tail of single PbWO 4 crystals has been investigated in the temperature range of 6-300 K. The absorption coefficient in the tail region is found to obey the Urbach rule, with the steepness parameter s 0 = 0.82 and the effective phonon energy hw = 32 meV. The present results are discussed in terms of the Sumi and Toyozawa theory on Urbach edges, indicating that they are consistent with other experimental results.

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“…Self-Raman lasers with laser-exhibit much lower reflection and scattering losses, as well as having a simpler and more robust cavity 1.1695 [22,23] a) Were used articles only in refereed journals. b) SRS-promoting mode was established in [24].…”

Section: Introductionmentioning

confidence: 99%