Reactive Atmosphere Growth of 2.06 Micron Laser Crystals.
Final technical rept. 11 Sep 73-8 Jun 74,
HUGHES RESEARCH LABS MALIBU CALIF
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A specified formula Y0.428Er0.500Tm0.067Ho0.005LiF4 was used as a first approximation to a laser system whereby the necessary broad pump bands and fast, efficient laser excitation could be obtained. Laser rods were cut from single crystal ingots grown by a reactive atmosphere process RAP. Thermal conductivity, hardness, elastic modulus, rupture strength, radiative characteristics, and laser test data were measured to determine the laser performance characteristics of HoYLF. Development of RAP HoYLF growth procedures provided proof of practical, congruent melting behavior. Electron probe, spectrographic analysis, and backscatter measurements showed R3 R Y Er Tm Ho in HoYLF acted as one ionic species in crystal growth. Glass-like optical quality HoYLF was RAP Czochralski grown at 5 mmhour. A short investigation of Bridgman growth indicated that higher yields and inexpensively scaled-up rod production technology can be developed.
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