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Title: Tapered laser rods as a means of minimizing the path length of trapped barrel mode rays

Abstract

By tapering the diameter of a flanged barrel laser rod over its length, the maximum trapped path length of a barrel mode can be dramatically reduced, thereby reducing the ability of the trapped spontaneous emission to negatively impact laser performance through amplified spontaneous emission (ASE). Laser rods with polished barrels and flanged end caps have found increasing application in diode array end-pumped laser systems. The polished barrel of the rod serves to confine diode array pump light within the rod. In systems utilizing an end-pumping geometry and such polished barrel laser rods, the pump light that is introduced into one or both ends of the laser rod, is ducted down the length of the rod via the total internal reflections (TIRs) that occur when the light strikes the rod's barrel. A disadvantage of using polished barrel laser rods is that such rods are very susceptible to barrel mode paths that can trap spontaneous emission over long path lengths. This trapped spontaneous emission can then be amplified through stimulated emission resulting in a situation where the stored energy available to the desired lasing mode is effectively depleted, which then negatively impacts the laser's performance, a result that is effectively reduced bymore » introducing a taper onto the laser rod.« less

Inventors:
; ; ; ;
Issue Date:
Research Org.:
Univ. of California, Oakland, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1175479
Patent Number(s):
6937636
Application Number:
09/651,658
Assignee:
The Regents of the University of California (Oakland, CA)
Patent Classifications (CPCs):
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01S - DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Beach, Raymond J., Honea, Eric C., Payne, Stephen A., Mercer, Ian, and Perry, Michael D. Tapered laser rods as a means of minimizing the path length of trapped barrel mode rays. United States: N. p., 2005. Web.
Beach, Raymond J., Honea, Eric C., Payne, Stephen A., Mercer, Ian, & Perry, Michael D. Tapered laser rods as a means of minimizing the path length of trapped barrel mode rays. United States.
Beach, Raymond J., Honea, Eric C., Payne, Stephen A., Mercer, Ian, and Perry, Michael D. Tue . "Tapered laser rods as a means of minimizing the path length of trapped barrel mode rays". United States. https://www.osti.gov/servlets/purl/1175479.
@article{osti_1175479,
title = {Tapered laser rods as a means of minimizing the path length of trapped barrel mode rays},
author = {Beach, Raymond J. and Honea, Eric C. and Payne, Stephen A. and Mercer, Ian and Perry, Michael D.},
abstractNote = {By tapering the diameter of a flanged barrel laser rod over its length, the maximum trapped path length of a barrel mode can be dramatically reduced, thereby reducing the ability of the trapped spontaneous emission to negatively impact laser performance through amplified spontaneous emission (ASE). Laser rods with polished barrels and flanged end caps have found increasing application in diode array end-pumped laser systems. The polished barrel of the rod serves to confine diode array pump light within the rod. In systems utilizing an end-pumping geometry and such polished barrel laser rods, the pump light that is introduced into one or both ends of the laser rod, is ducted down the length of the rod via the total internal reflections (TIRs) that occur when the light strikes the rod's barrel. A disadvantage of using polished barrel laser rods is that such rods are very susceptible to barrel mode paths that can trap spontaneous emission over long path lengths. This trapped spontaneous emission can then be amplified through stimulated emission resulting in a situation where the stored energy available to the desired lasing mode is effectively depleted, which then negatively impacts the laser's performance, a result that is effectively reduced by introducing a taper onto the laser rod.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2005},
month = {8}
}

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Works referenced in this record:

183-W, M^2 = 24 Yb:YAG Q-switched laser
journal, January 1999


High-average-power diode-pumped Yb:YAG lasers
conference, April 2000


High-average-power 1-μm performance and frequency conversion of a diode-end-pumped Yb:YAG laser
journal, January 1998