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Title: Properties of a new average power Nd-doped phosphate laser glass

Abstract

The Nd-doped phosphate laser glass described herein can withstand 2.3 times greater thermal loading without fracture, compared to APG-1 (commercially-available average-power glass from Schott Glass Technologies). The enhanced thermal loading capability is established on the basis of the intrinsic thermomechanical properties and by direct thermally-induced fracture experiments using Ar-ion laser heating of the samples. This Nd-doped phosphate glass (referred to as APG-t) is found to be characterized by a 29% lower gain cross section and a 25% longer low-concentration emission lifetime.

Authors:
; ; ;  [1];  [2]
  1. Lawrence Livermore National Lab., CA (United States)
  2. Schott Glass Technologies, Duryea, PA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States); Department of Defense, Washington, DC (United States)
OSTI Identifier:
100000
Report Number(s):
UCRL-JC-118191; CONF-950101-8
ON: DE95016625
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Advanced solid-state laser conference, Memphis, TN (United States), 29 Jan - 1 Feb 1995; Other Information: PBD: 9 Mar 1995
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; 36 MATERIALS SCIENCE; PHOSPHATE GLASS; THERMODYNAMIC PROPERTIES; SOLID STATE LASERS; LASER MATERIALS; OPTICAL SYSTEMS; DOPED MATERIALS; NEODYMIUM

Citation Formats

Payne, S.A., Marshall, C.D., Bayramian, A.J., Wilke, G.D., and Hayden, J.S. Properties of a new average power Nd-doped phosphate laser glass. United States: N. p., 1995. Web.
Payne, S.A., Marshall, C.D., Bayramian, A.J., Wilke, G.D., & Hayden, J.S. Properties of a new average power Nd-doped phosphate laser glass. United States.
Payne, S.A., Marshall, C.D., Bayramian, A.J., Wilke, G.D., and Hayden, J.S. Thu . "Properties of a new average power Nd-doped phosphate laser glass". United States. doi:. https://www.osti.gov/servlets/purl/100000.
@article{osti_100000,
title = {Properties of a new average power Nd-doped phosphate laser glass},
author = {Payne, S.A. and Marshall, C.D. and Bayramian, A.J. and Wilke, G.D. and Hayden, J.S.},
abstractNote = {The Nd-doped phosphate laser glass described herein can withstand 2.3 times greater thermal loading without fracture, compared to APG-1 (commercially-available average-power glass from Schott Glass Technologies). The enhanced thermal loading capability is established on the basis of the intrinsic thermomechanical properties and by direct thermally-induced fracture experiments using Ar-ion laser heating of the samples. This Nd-doped phosphate glass (referred to as APG-t) is found to be characterized by a 29% lower gain cross section and a 25% longer low-concentration emission lifetime.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Mar 09 00:00:00 EST 1995},
month = {Thu Mar 09 00:00:00 EST 1995}
}

Conference:
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  • The Nd-doped phosphate laser glass described herein can withstand 2.3 times greater thermal loading without fracture, compared to APG-1 (commercially-available average-power glass from Schott Glass Technologies). The enhanced thermal loading capability is established on the basis of the intrinsic thermomechanical properties (expansion, conduction, fracture toughness, and Young`s modulus), and by direct thermally-induced fracture experiments using Ar-ion laser heating of the samples. This Nd-doped phosphate glass (referred to as APG-t) is found to be characterized by a 29% lower gain cross section and a 25% longer low-concentration emission lifetime.
  • In recent years, the effect of laser pre-irradiation and ion exchange on glasses surface were widely carried out to stabilize their damage thresholds. But comparison of ion exchange and CW CO{sub 2} laser treatment is never studied. This paper is devoted to the investigation of this question. Nd-doped phosphate laser glasses were heated with CW CO{sub 2} laser radiation and were strengthened by ion exchange. Laser damage thresholds of the surface were measured with 1064 nm 10 ns pulses focused to small spots irradiation. Both ion exchange treatment and CW CO{sub 2} laser treatment result in residual compress stress occurredmore » at surface, peak-to-valley and microcracks decreased in surface appearance, and damage thresholds of surfaces increased by a factor of over 2. Polariscope, reflected optical microscope and atomic force microscope are used for stress, damage morphologies and surface topography analysis on glass surface. It is shown that laser condition mechanism is consistent with ion exchange treatment mechanism.« less
  • A fracture-mechanic theory suggests that crack-propagation rates are proportional to the square root of the inclusion radius and to the three-quarters power of the fluence. The theory does not yet account for pressure loss or convection heat transfer as platinum vapor flows into the crack, and needs to be developed further before accurate propagation rates can be predicted. However, a simple estimate obtained by multiplying the time that the platinum is in the vapor state by the sonic velocity in glass gives a conservative but reasonable result. At fluence levels of 2 J/cm/sup 2/, crack propagation of 4 ..mu..m permore » shot are predicted. A crack-development hypothesis, based on shock-wave propagation, successfully predicts the shape of typical damage sites. The sites have an annular crack extending from the equator of the inclusion and planar crack lobes extending from the poles. The lobe at the pole exposed to laser light is larger than the lobe at the unexposed pole. A numerical heat-transport model predicts temperature profiles in and around a metallic platinum inclusion imbedded in a phosphate laser glass matrix when illuminated with 1-..mu..m laser light. The thermal model predicts that glass damage will occur if the platinum temperature exceeds the boiling point. Predicted fluence-damage limits of 1.4 J/cm/sup 2/ for a 1-ns pulse and 4.3 J/cm/sup 2/ for a 10-ns pulse agree with experimental data. The damage limit is independent of inclusion size above about 1 ..mu..m diameter.« less
  • The NIF and LMJ laser systems require about 3380 and 4752 Nd-doped laser glass slabs, respectively. Continuous laser glass melting and forming will be used for the first time to manufacture these slabs. Two vendors have been chosen to produce the glass: Hoya Corporation and Schott Glass Technologies. The laser glass melting systems that each of these two vendors have designed, built and tested are arguably the most advanced in the world. Production of the laser glass will begin on a pilot scale in the fall of 1999.
  • Laser shot peening, a surface treatment for metals, is known to induce residual compressive stresses to depths of over 1 mm providing improved component resistance to various forms of failure. Recent information also suggests that thermal relaxation of the laser induced stress is significantly less than that experienced by other forms of surface stressing that involve significantly higher levels of cold work. We have developed a unique solid state laser technology employing Nd:glass amplifier slabs and SBS phase conjugation that enables this process to move into high throughput production processing.