Near-infrared diode-pumped white-light emission from erbium-doped calcium fluoride crystal

Mical Culp; Vernessa M. Edwards; B. Rami Reddi

doi:10.1117/12.2206078

24 February 2016 Near-infrared diode-pumped white-light emission from erbium-doped calcium fluoride crystal

Mical Culp, Vernessa M. Edwards, B. Rami Reddi

Proceedings Volume 9744, Optical Components and Materials XIII; 974407 (2016) https://doi.org/10.1117/12.2206078
Event: SPIE OPTO, 2016, San Francisco, California, United States

Abstract

CaF₂ is a cubic material and Erbium enters the lattice in triply ionized state. Erbium occupies Ca sites in the material. Defects occur in the material because a trivalent dopant ion replaces a divalent host ion. Er³⁺ occupies several different sites. Absorption spectrum of Er³⁺-doped CaF₂ revealed absorption peaks at 255, 365, 379, 407, 441, 449, 487, 522, 539, 652 and 798 nm. When the sample was excited with an 800 nm near-infrared laser it revealed emissions at 390, 415, 462, 555, 665 and 790 nm. The absorption and emission peaks are identified with Er³⁺ spectral transitions. The sample color appears to be either white or green under near-infrared laser excitation. Emission color was found to be dependent on the pump laser wavelength used and laser power. Excitation spectral recordings were made by tuning the pump laser wavelength. The sample emission appears to be white under near-infrared excitation as well as violet laser excitation. Excited state lifetimes are measured to analyze the data. Our studies indicate that this sample is useful in solid state lighting applications.

Citation Download Citation

Mical Culp, Vernessa M. Edwards, and B. Rami Reddi "Near-infrared diode-pumped white-light emission from erbium-doped calcium fluoride crystal", Proc. SPIE 9744, Optical Components and Materials XIII, 974407 (24 February 2016); https://doi.org/10.1117/12.2206078

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