Accession Number : AD0902196

Title :   Electrooptical Modulator. Volume 1.

Descriptive Note : Final rept. 28 Jun-28 Dec 71,

Corporate Author : MCDONNELL DOUGLAS ASTRONAUTICS CO ST LOUIS MO

Personal Author(s) : Allen, Louis B.

Report Date : MAR 1972

Pagination or Media Count : 233

Abstract : The objective of this program was to evaluate and compare various available electrooptical modulator materials appropriate for 0.53 micrometers and 1.06 micrometers modulation. The evaluation data provide a more rational basis for selection of an optimum modulator material for the design of a modulator for near term use with a high-bit-rate, mode-locked Nd:YAG laser. The effects imposed upon the subnanosecond optical bit stream were experimentally analyzed by the operation of the electrooptical modulator material. The effects of particular importance included: variations to the beam divergence, spatial reorientations, temporal distortions of the subnanosecond pulse shape, and resulting far field effects. Materials compared included: Ammonium Dihydrogen Phosphate (ADP), Potassium Dihydrogen Phosphate (KDP), Potassium Dideuterium Phosphate (KD*), Lithium Niobate (LiNbO3), Lithium Tantalate (LiTaO3), Barium Sodium Niobate (Ba2NaNb5O15), and Strontium Barium Niobate (Sr(x)3a(1-x)Nb2U6). Optimum materials were first tested in bulk configurations, and the most promising were then more fully tested in the physical configuration of a modulator. As a result of this investigation, it was concluded that lithium tantalate is the best modulator material choice for use with a mode-locked Nd:YAG laser at both the fundamental 1.06 micrometers wavelength and the frequency-doubled 0.53 micrometers wavelength in high-data-rate communication applications.

Descriptors :   *MODULATORS), (*ELECTROOPTICS, (*OPTICAL MATERIALS, MODULATORS), DATA TRANSMISSION SYSTEMS, LASERS, SPACE COMMUNICATIONS, OPTICAL COMMUNICATIONS, NEODYMIUM, AMMONIUM COMPOUNDS, HYDROGEN COMPOUNDS, PHOSPHATES, BARIUM COMPOUNDS, SODIUM COMPOUNDS, NIOBATES, SINGLE CRYSTALS, LITHIUM COMPOUNDS, TANTALUM COMPOUNDS, POTASSIUM COMPOUNDS, DEUTERIUM, STRONTIUM COMPOUNDS, INFRARED OPTICAL MATERIALS.

Subject Categories : Lasers and Masers
      Miscellaneous Materials
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE