Characterization of AgGaSe2 and ZnGeP2 for frequency doubling CO2 laser output. Master's thesis

Technical Report · Sat Sep 01 04:00:00 EDT 1990

OSTI ID:5805944

Turner, M D

This experiment was to characterize the nonlinear performance of AgGaSe2 and ZnGeP2 for frequency doubling CO2 laser output at 10.6 um. The experiments included a series of theoretical estimates of the source and crystal performance to define the measurements to be performed. The parameters of interest were the phase matching angles, angular acceptance, conversion efficiency and damage thresholds. The 9mmX9mmX29mm antireflection coated sample of AgGaSe2, with a phase matching angle of theta=55.02 deg. and an internal acceptance bandwidth Delta theta=0.298 deg., achieved a maximum second harmonic conversion efficiency of 20.5%. Surface damage limited the improvement of the efficiency and the threshold for the coated surface was near 4.5kW/cm. Further damage studies were conducted using small witness samples from the same crystal boule. For the case of the uncoated sample of ZnGeP2, the theoretical computations pointed out that the performance would have been poor at best due to an extremely small effective nonlinear coefficient at the temperature tuned phase matching angles. These calculations are presented, though no output at 5.3 um was observed during these experiments.

• Research Organization: Air Force Inst. of Tech., Wright-Patterson AFB, OH (USA). School of Engineering
• OSTI ID: 5805944
• Report Number(s): AD-A-230354/3/XAB; AFIT/GEP/ENP--90D-10
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426002* -- Engineering-- Lasers & Masers-- (1990-)
CARBON DIOXIDE LASERS
CHALCOGENIDES
CHALCOPYRITE
COATINGS
CONVERSION
COPPER
COPPER COMPOUNDS
COPPER SULFIDES
CRYSTALS
DAMAGE
DATA
EFFICIENCY
ELECTROMAGNETIC RADIATION
ELEMENTS
FREQUENCY MIXING
GAS LASERS
HARMONIC GENERATION
INFORMATION
IRON COMPOUNDS
IRON SULFIDES
LASER RADIATION
LASERS
METALS
MINERALS
NONLINEAR PROBLEMS
PHOSPHIDES
PHOSPHORUS COMPOUNDS
PNICTIDES
PYRITE
RADIATIONS
SELENIDES
SELENIUM COMPOUNDS
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
SURFACES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS