Low-level pulsed 1064-nm laser radiometer transfer standard

Rodney W. Leonhardt

doi:10.1117/12.257152

8 November 1996 Low-level pulsed 1064-nm laser radiometer transfer standard

Rodney W. Leonhardt

Proceedings Volume 2815, Optical Radiation Measurements III; (1996) https://doi.org/10.1117/12.257152
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

The National Institute of Standards and Technology (NIST) has developed a low-level peak power and pulse energy radiometer (APD 900) transfer standard for collimated laser light at a wavelength of 1064 nm. The peak power irradiance measurement range is from 500 pW/cm² to 50 (mu) W/cm² for laser pulse widths of 10 -250 ns. The pulse energy measurement range is from 0.05 fJ/cm² to 50 pJ/cm². The instrument combines the functions of peak power and pulse energy measurement into one unit, and improves the responsivity by two orders of magnitude greater than previous NIST designs calibrated at 1064 nm. The radiometer is based on an infrared-enhanced silicon avalanche photodiode with 100 mm diameter full aperture collecting optics. Selectable aperture sizes and a neutral density filter extend the measurement range of the instrument to higher levels, especially with large diameter beams. The output is a voltage waveform that can be measured with an oscilloscope. Calibration uncertainty for the APD 900 radiometer is typically less than +/- 8%. Improvements in the NIST calibration system will potentially lower the uncertainty to approximately +/- 5%.

Citation Download Citation

Rodney W. Leonhardt "Low-level pulsed 1064-nm laser radiometer transfer standard", Proc. SPIE 2815, Optical Radiation Measurements III, (8 November 1996); https://doi.org/10.1117/12.257152

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