Browse Prior Art Database

Fabrication of Laser Material

IP.com Disclosure Number: IPCOM000080533D
Original Publication Date: 1974-Jan-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Courtens, EL: AUTHOR [+2]

Abstract

Rare earth aluminates as laser host materials for Nd or Cr are grown as large single crystals of optical quality from high-temperature solutions.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Fabrication of Laser Material

Rare earth aluminates as laser host materials for Nd or Cr are grown as large single crystals of optical quality from high-temperature solutions.

Inclusion-free Cd Al O3 : Nd crystals of more than 2 cm size were grown. 106.25 g Gd2 03, 3.75 g Nd2 O3, 30.625 g A12 O3, 315.0 g PbO, 315.0 g Pb F2,
18.75 g B2 O3 and 4.375 g Pb O2 were mixed and premelted in a 180 cm/3/ platinum crucible which, after sealing, was placed in a furnace. To produce a homogeneous solution, it was heated to 1300 - 1320 degrees C for 15 hours. Alternate cooling to 1200 degrees C and heating again to 1260 degrees C effected spontaneous nucleation of many small crystals and subsequent reduction of their number. To grow one or few crystals, very slow cooling followed from 1260 degrees C to 950 degrees C at a rate of 0.3 degrees C per hour. To homogenize the solution and to achieve smooth solution flow along the growing crystal faces, natural or forced convection was applied.

An effective distribution coefficient near unity facilitated growth of homogeneous laser crystals. Polarized emission at 10.688 Angstrom was observed. With respect to pumping efficiency the Gd Al O3 : Nd compared favorably with a YAG laser.

Modified procedures have been used to grow Cd Al O3 with other dopants, for instance with chromium and with neodymium plus chromium, from high- temperature solutions.

1