Excited-state absorption spectra and gain measurements of CaF sub 2 :Sm sup 2+

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Journal of the Optical Society of America, Part B: Optical Physics; (United States)

DOI:https://doi.org/10.1364/JOSAB.8.001404· OSTI ID:5482425

Lawson, J K; Payne, S A ^[1]

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1. Lawrence Livermore National Laboratory, University of California, P.O. Box 5508, L-490, Livermore, California 94550 (USA)

We have measured the pump--probe spectrum for CaF{sub 2}:Sm{sup 2+} over a wide (360--1020 nm) spectral range. We observed gain throughout most of the 730-nm emission band, although there is some evidence of excited-state absorption (ESA) in this region. A much stronger ESA was observed near 500 nm. The temperature dependence of the ESA signal clearly indicates that the absorption is associated with divalent samarium. Because of the width and strength of this transition, we assign the ESA to a 4{ital f}{sup 5}5{ital d} {r arrow} conduction band transition. We calculated the oscillator strength for this ESA band to be 0.10 and rationalized its magnitude based on an intensity-borrowing mechanism that involves the transition from the valence band to the conduction band.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5482425
• Journal Information: Journal of the Optical Society of America, Part B: Optical Physics; (United States), Journal Name: Journal of the Optical Society of America, Part B: Optical Physics; (United States) Vol. 8:7; ISSN JOBPD; ISSN 0740-3224
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603 -- Materials-- Properties
42 ENGINEERING
426002* -- Engineering-- Lasers & Masers-- (1990-)
ABSORPTION SPECTRA
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
AMPLIFICATION
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
ENERGY LEVELS
EXCITED STATES
FLUORIDES
FLUORINE COMPOUNDS
GAIN
HALIDES
HALOGEN COMPOUNDS
INFRARED SPECTRA
LASERS
LOW TEMPERATURE
OSCILLATOR STRENGTHS
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
SAMARIUM ADDITIONS
SAMARIUM ALLOYS
SOLID STATE LASERS
SPECTRA
TEMPERATURE DEPENDENCE
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA