Optics: measuring and testing – Photometers
Reexamination Certificate
2011-03-15
2011-03-15
Pham, Hoa Q (Department: 2886)
Optics: measuring and testing
Photometers
C356S218000, C374S121000
Reexamination Certificate
active
07907266
ABSTRACT:
A radiometer the calibration of collimated pulsed laser sources. In one embodiment the laser sources have wavelengths of 1064 nm and 1540-1570 nm wavelengths at irradiance levels of 7×10−5to 5×1010Watts/cm2, with pulse widths of 5-400 ns. A lens system used to focus beams from the laser sources includes two piano convex lenses and one aspheric lens, all with 1.5 micron and 1.06 micron anti-reflection coatings. An InGaAs avalanche photodiode (APD) detector and a linear amplifier generate an output voltage which represents the pulse and power of the input laser. The output voltage is captured on a fast oscilloscope and converted to irradiance through NIST calibration factors. The detector is kept at a constant predetermined temperature with a heater ring and feedback circuit. The detector is mounted on a translation stage for placing the detector at the proper position for the 1064 nm and 1540-1570 nm wavelengths.
REFERENCES:
patent: 4320289 (1982-03-01), White et al.
patent: 4495416 (1985-01-01), Mason et al.
patent: 4842404 (1989-06-01), Duda
patent: 2005/0201444 (2005-09-01), Hollander et al.
King Daniel Wayne
Leonhardt Rodney William
Blakely , Sokoloff, Taylor & Zafman LLP
Pham Hoa Q
The United States of America as represented by the Secretary of
LandOfFree
Radiometer for detecting and measuring low levels of pulsed... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Radiometer for detecting and measuring low levels of pulsed..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radiometer for detecting and measuring low levels of pulsed... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2675725