US 12,149,038 B2
Nanoparticle doping for lasers and amplifiers operating at eye-safer wavelengths, and/or exhibiting reduced stimulated Brillouin scattering
Colin C. Baker, Alexandria, VA (US); Edward J. Friebele, Cheverly, MD (US); Woohong Kim, Lorton, VA (US); L. Brandon Shaw, Woodbridge, VA (US); and Jasbinder S. Sanghera, Ashburn, VA (US)
Assigned to The Government of the United States of America, as represented by the Secretary of the Navy, Arlington, VA (US)
Filed by The Government of the United States, as represented by the Secretary of the Navy, Washington, DC (US)
Filed on Jun. 22, 2021, as Appl. No. 17/354,466.
Application 17/354,466 is a continuation of application No. 15/783,836, filed on Oct. 13, 2017, granted, now 11,043,785.
Claims priority of provisional application 62/408,202, filed on Oct. 14, 2016.
Prior Publication US 2021/0313756 A1, Oct. 7, 2021
Int. Cl. H01S 3/067 (2006.01); B82Y 20/00 (2011.01); C03B 37/012 (2006.01); C03C 13/04 (2006.01); C03C 14/00 (2006.01); H01S 3/16 (2006.01); H01S 3/17 (2006.01); B82Y 30/00 (2011.01)
CPC H01S 3/06716 (2013.01) [C03C 13/04 (2013.01); C03C 13/045 (2013.01); C03C 14/006 (2013.01); H01S 3/1603 (2013.01); H01S 3/169 (2013.01); H01S 3/176 (2013.01); B82Y 20/00 (2013.01); B82Y 30/00 (2013.01); C03B 37/01208 (2013.01); C03B 37/01262 (2013.01); C03B 2201/34 (2013.01); C03C 2214/16 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for doping a silica preform, comprising:
forming a cladding layer by flowing SiCl4 and O2 gas into a substrate tube that is heated to a first temperature where the SiCl4 and O2 gas react to form the cladding layer;
forming a silica core soot by flowing SiCl4 and O2 gas into the substrate tube with the cladding layer where the substrate tube with the cladding layer is heated to a second temperature, lower than the first temperature;
soaking the silica core soot in a dispersion that includes nanoparticles doped with rare-earth ions;
drying the silica core soot; and
consolidating the silica core soot and the nanoparticles doped with rare-earth ions to form a consolidated doped core layer,
wherein the nanoparticles have a smaller phonon energy than silica.