The National Institute of Standards and Technology (NIST) and the Naval Surface Warfare Center Corona Division (NSWC) have jointly developed a low-level peak-power radiometer (D-ESR) which functions as a transfer standard for measuring laser pulses at wavelengths of 1.06 and 1.55 υm. The peak-power irradiance range is from 500 pW/cm2 to 50 υW/cm2 within the wavelength range of 1.54 to 1.58 υm. A similar peak-power range is covered at a wavelength of 1.06 υm. The measurement range is covered by using smaller apertures or a neutral density filter to reach the highest peak-powers. The D-ESR radiometer is based on a custom fabricated InGaAs avalanche photodiode (APD) detector/preamplifier module. The light collecting optical system has a maximum aperture of approximately 125 cm2. The D-ESR is able to measure Gaussian pulse durations from 4 to 400 ns. The output is a negative going pulse waveform which is measured with an oscilloscope. The total uncertainty of a calibrated D-ESR radiometer is approximately 9 percent (k=2).
Proceedings Title: SPIE Defense, Security, and Sensing
Conference Dates: April 25-29, 2011
Conference Location: Orlando, FL
Pub Type: Conferences
dual wavelength, infrared, laser peak-power, low-level, transfer standard