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Title: Multidisciplinary Approaches to Radiation Balanced Lasers (MARBLe): 1st Annual Progress Report

Abstract

The initial main modifications of the existing μPD crystal-growth system at LANL have been completed. This now gives us the new capability to develop the growth of crystalline RBL materials by both the μPD and the Bridgman method. Quantitative mass spectrometry of the growth atmosphere was conducted to identify possible sources of gaseous trace species (primarily hydrogen) that could cause the undesired reduction of Yb 3+ to Yb 2+ during the crystal growth. Hydrogen was found to be at sufficiently low levels to not be a respective concern. Studies on the thermal decomposition of YbF 3 to form Yb 2+ are currently underway in collaboration with MARBLe team member Prof. Pauzauskie. First samples of Yb 3+-doped YLiF 4 (YLF:Yb) and undoped LiLuF 4 (LLF) were grown, and MARBLe team member Prof. Sheik-Bahae has performed measurements of laser-induced heating (YLF:Yb) and background absorption coefficient (LLF). We discovered that one or several of the YF 3, LiF, and YbF 3 precursors contains organic impurities that chemically reduce to black residue during the high-temperature growth in oxygen-free argon atmosphere. A process for removal of these residues prior to growth is being considered. Comparing the results from incongruently melting YLF with those of congruentlymore » melting LLF indicate that a congruently melting material is preferred for Bridgman growth. Crystal-growth experiments with LLF are currently underway. The results of these studies on Yb 3+ doped materials will be directly applicable to the future growth of Er 3+ and Tm 3+ doped as well as Yb 3+, Nd 3+ co-doped RBL crystals. There was no activity on the parallel effort of developing rareearth- doped chalcogenide glasses. The primary reason was a lack of manpower due to a delayed hiring of a student. In September 2017, we have hired a Postdoctoral Researcher who will be able to contribute to the growth (at LANL) and optical characterization (at UNM) of RBL materials.« less

Authors:
 [1]
  1. Los Alamos National Lab. (LANL) and New Mexico Consortium (NMC), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1392826
Report Number(s):
LA-UR-17-28195
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Material Science

Citation Formats

Hehlen, Markus Peter. Multidisciplinary Approaches to Radiation Balanced Lasers (MARBLe): 1st Annual Progress Report. United States: N. p., 2017. Web. doi:10.2172/1392826.
Hehlen, Markus Peter. Multidisciplinary Approaches to Radiation Balanced Lasers (MARBLe): 1st Annual Progress Report. United States. doi:10.2172/1392826.
Hehlen, Markus Peter. Tue . "Multidisciplinary Approaches to Radiation Balanced Lasers (MARBLe): 1st Annual Progress Report". United States. doi:10.2172/1392826. https://www.osti.gov/servlets/purl/1392826.
@article{osti_1392826,
title = {Multidisciplinary Approaches to Radiation Balanced Lasers (MARBLe): 1st Annual Progress Report},
author = {Hehlen, Markus Peter},
abstractNote = {The initial main modifications of the existing μPD crystal-growth system at LANL have been completed. This now gives us the new capability to develop the growth of crystalline RBL materials by both the μPD and the Bridgman method. Quantitative mass spectrometry of the growth atmosphere was conducted to identify possible sources of gaseous trace species (primarily hydrogen) that could cause the undesired reduction of Yb3+ to Yb2+ during the crystal growth. Hydrogen was found to be at sufficiently low levels to not be a respective concern. Studies on the thermal decomposition of YbF3 to form Yb2+ are currently underway in collaboration with MARBLe team member Prof. Pauzauskie. First samples of Yb3+-doped YLiF4 (YLF:Yb) and undoped LiLuF4 (LLF) were grown, and MARBLe team member Prof. Sheik-Bahae has performed measurements of laser-induced heating (YLF:Yb) and background absorption coefficient (LLF). We discovered that one or several of the YF3, LiF, and YbF3 precursors contains organic impurities that chemically reduce to black residue during the high-temperature growth in oxygen-free argon atmosphere. A process for removal of these residues prior to growth is being considered. Comparing the results from incongruently melting YLF with those of congruently melting LLF indicate that a congruently melting material is preferred for Bridgman growth. Crystal-growth experiments with LLF are currently underway. The results of these studies on Yb3+ doped materials will be directly applicable to the future growth of Er3+ and Tm3+ doped as well as Yb3+, Nd3+ co-doped RBL crystals. There was no activity on the parallel effort of developing rareearth- doped chalcogenide glasses. The primary reason was a lack of manpower due to a delayed hiring of a student. In September 2017, we have hired a Postdoctoral Researcher who will be able to contribute to the growth (at LANL) and optical characterization (at UNM) of RBL materials.},
doi = {10.2172/1392826},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Sep 12 00:00:00 EDT 2017},
month = {Tue Sep 12 00:00:00 EDT 2017}
}

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