Emission cross section and fluorescence efficiency of Nd-pentaphosphate

Author

Weber, Heinz P. ; Liao, Paul F. ; Tofield, B.C.

Author_Institution

Bell Telephone Laboratories, Inc., Holmdel, NJ

Volume

10

Issue

7

fYear

1974

fDate

7/1/1974 12:00:00 AM

Firstpage

563

Lastpage

567

Abstract

The room-temperature cross sections for the Nd³⁺⁴ $F_{3/2}$ levels to the⁴ $I_{11/2}$ and⁴ $I_{9/2}$ manifolds (lower laser state and ground state, respectively) in NdP5O14are measured by two spectroscopic methods. A value for the largest cross section of $\\sigma (R_{1} - Y_{2}) = 1.7 \\times 10^{-19}$ cm²is found. The highest effective cross section, resulting from superposition of two lines at 1.051 μm, gives a laser gain per Nd ion which is about 2/3 of the maximum gain in YAG:Nd. The relative branching ratio into the⁴ $I_{11/2}$ and⁴ $I_{9/2}$ manifolds is 0.65:0.35. Comparison of the integrated cross sections with the measured lifetime for 1-percent Nd in LaP5O14indicates a combined efficiency <0.1 for the remaining transitions, namely radiative decay into the⁴ $I_{13/2}$ and⁴ $I_{15/2}$ manifolds and multiphonon quenching. A measurement of temperature dependence of fluorescence lifetime supports this last result.

Keywords

Absorption; Crystalline materials; Fluorescence; Laser transitions; Neodymium; Optical materials; Pump lasers; Spectroscopy; Stationary state; Temperature measurement;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/JQE.1974.1068195

Filename

1068195