Optical gain measurements in doped alkali-halides

Luminescent aggregates of the type of Cs4PbBr6 dispersed in a CsBr crystal lattice have been observed for the first time in as‐grown and in annealed (at 160 to 260 °C for 20 h) CsBr:Pb single crystals with a sufficiently large lead concentration (0.3 to 1.8 mol% in the melt). Absorption spectra as well as spectral, polarization and kinetic characteristics of their luminescence peaking near 3.3 eV and excited near 4.0 eV and 5.2 to 5.1 eV have been studied at 4.2 to 200 K. The characteristics of the Cs4PbBr6 aggregates have been compared with those of a Cs4PbBr6 single crystal and with the characteristics of Pb2+ centres in a quenched CsBr:Pb crystal. The origin and the structure of the corresponding relaxed excited states have been discussed.

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“…where K and b are constants (see also [12]). The optical gain G for a given pumped length of the crystal is defined as G exp(bI exc ) .…”

Section: Resultsmentioning

confidence: 99%

Luminescence of Cs4PbBr6 Aggregates in As-Grown and in Annealed CsBr:Pb Single Crystals

Babin

Fabeni²,

Mihóková

et al. 2000

phys. stat. sol. (b)

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“…This technique proposes to measure the fluorescence yield from the face of the pencil-shaped AM as a function of its length and/or pumping rate. It has been successfully employed to study the gain properties of gas and metal vapor lasers [9,10], organic dyes in liquid solution [11,12], semiconductors [13] and solid-state AM [14,15].…”

Section: Introductionmentioning

confidence: 99%

Z-scan technique to study gain properties of optically pumped media

Семашко¹,

Akhtyamov²,

Shavelev³

et al. 2018

Laser Phys. Lett.

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The opportunity to study the optical gain properties of active media using the open aperture z-scan technique without an additional probe beam is demonstrated. The method allows for the evaluation of pump-induced photodynamic process parameters in UV solid-state active media on pumping and lasing wavelengths: excited-state absorption and photoionization crosssections of active ions, effective absorption and ionization cross-sections of color centers and recombination rates.

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