Accession Number : ADA268367


Title :   Measurements of Optical-Heterodyne Conversion in Low-Temperature Grown


Descriptive Note : Journal article,


Corporate Author : MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB


Personal Author(s) : Brown, E R ; McIntosh, K A ; Smith, F W ; Manfra, M J ; Dennis, C L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a268367.pdf


Report Date : 15 Mar 1993


Pagination or Media Count : 5


Abstract : A low-temperature-grown GaAs interdigitated-electrode photomixer is used to generate coherent power at microwave frequencies. An output power of 200 microwatts ( - 7 dBm) is generated by pumping the photomixer with two 70-mW modes of a Ti:Al 203 laser, separated in frequency by 200 MHz. This represents an optical-to-microwave conversion efficiency of 0.14%, which is within 50% of a prediction based on optical-heterodyne theory. When two lasers are used and the frequency of one is tuned with respect to the other, the output frequency of the photomixer increases smoothly and the output power is nearly constant up to 20 GHz. At higher frequencies the power decays because of parasitic capacitance.


Descriptors :   *OPTICAL PROPERTIES , *LOW TEMPERATURE , *HETERODYNING , *LASERS , *GALLIUM ARSENIDES , CONVERSION , FREQUENCY , OUTPUT , EFFICIENCY , SEMICONDUCTORS , PUMPING , CAPACITANCE , POWER , TITANIUM , CONSTANTS , ELECTRODES , ALUMINUM OXIDES , MICROWAVES , COHERENCE , PREDICTIONS , TEMPERATURE , METALS , REPRINTS , MEASUREMENT


Subject Categories : Electrical and Electronic Equipment
      Lasers and Masers
      Electricity and Magnetism
      Radiofrequency Wave Propagation


Distribution Statement : APPROVED FOR PUBLIC RELEASE