Spectroscopic investigation of the visible and mid-infrared emission in Tm- and Ho-doped YAG and YLF crystals

Falconieri, M.; Lanzi, A.; Salvetti, G.; Toncelli, A.

doi:10.1007/bf01081692

Cited by 10 publications

(2 citation statements)

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“…Available literature data show that attempts have been made to obtain monocrystals both doped and co-doped with holmium and thulium ions such as Tm, Ho:GdVO 4 [16] or Tm, Ho:YAlO 3 [17]. In addition, works of Falconieri et al [18,19] and French et al [20] focusing on the spectroscopic properties of Tm, Ho:YAG crystals and, in particular, energy transfer between dopant ions, have been published. Liu et al [21] and Urata [22,23] have proved that similar phenomena can be observed in Tm, Ho:YAG ceramics.…”

Section: Introductionmentioning

confidence: 96%

Fabrication and optical studies of transparent Tm, Ho:YAG ceramics

et al. 2015

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Section: Introductionmentioning

confidence: 96%

Fabrication and optical studies of transparent Tm, Ho:YAG ceramics

et al. 2015

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“…Various methods and approaches have been reported for suppressing thermal effects or to distinguish them from the pure optical nonlinearity of the material. [ 33–37 ] Sandeep et al., and Wickremasinghe et al., have shown the role of pulse repetition rate on suppression of thermal effects in a nonlinear medium. [ 13,33 ] Abdullah et al., have extracted the pure nonlinear optical coefficients under high repetition rate excitation by using a theoretical approximation.…”

Section: Introductionmentioning

confidence: 99%

Electric Control of Thermal Contributions to the Nonlinear Optical Properties of Nitrobenzene

Bongu,

Buchmüller,

Neumaier

et al. 2023

Advanced Physics Research

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Thermal effects are inevitable when an absorptive nonlinear optical material interacts with long pulse duration or high repetition rate laser pulses. It results in inaccurate characterization and reduction in efficiency of the nonlinear materials for device applications. In this article, the study investigates the influence of an external electric field on the thermal contribution to the nonlinear optical response of nitrobenzene (NB). Z‐scan measurements are performed on NB using 330 ps laser pulses at a wavelength of 532 nm with variable (10 Hz to 1 kHz) repetition rates. At low repetition rates, NB shows a positive nonlinear refractive index (+ n2), which leads to self‐focusing of the laser beam due to the optical Kerr effect. Cumulative thermal effects occur above a repetition rate of 200 Hz. At high repetition rates (>750 Hz), the sign of n2 becomes negative, implying a self‐defocusing behavior of the sample arising from the thermal‐induced nonlinear refractive index. By applying an external DC field to the NB, a reduction of the thermal contribution can be observed. At a sufficiently high electric field strength, the thermal contribution is suppressed and the inherent Kerr nonlinearity can be observed despite the high repetition rate of the pump laser.

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