1 June 1992 Coherent 1.06 micron laser radar for fiber preamplifier research
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Abstract
Operation of a coherent 1.06 micron all solid state lidar system made from all commercially available components has been accomplished. The system uses fiber optics for coherently mixing the signal energy with the local oscillator and it has a sub kHz frequency sensitivity making it ideal for examining the effects on system performance of the optical fiber amplifiers that are currently under development. The coherent 1.06 micron system uses a Nd:YAG stable ring laser as the source. This source is protected from reflections further along the optical train by an optical isolator. The local oscillator energy is pulled off from the main beam with a polarization beam splitter cube and frequency-shifted by 200 MHz with an acoustooptic modulator. The transmit/receive switch utilizes a polarization beam splitter-polarization rotator combination. The signal and local oscillator energies are focused into separate polarization preserving single mode fibers and coherently mixed with a variable evanescent wave coupler. Detection is achieved with a room temperature InGaAs pigtailed PiN diode. The output of the detector is processed with an RF electronic spectrum analyzer.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Scott H. McCracken, Michael S. Salisbury, "Coherent 1.06 micron laser radar for fiber preamplifier research", Proc. SPIE 1633, Laser Radar VII: Advanced Technology for Applications, (1 June 1992); doi: 10.1117/12.59209; https://doi.org/10.1117/12.59209
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