Updates from the
Show Floor
CLEO/QELS '99
Thursday, May 27, 1999

Hamamatsu Announces
R7110U-40 Hybrid Photodetectors

BALTIMORE, MD, May 26 -- The R7110U-40 compact hybrid photodetector from Hamamatsu Corporation is designed to offer low excess noise and high-fidelity electron multiplication, even at very low light levels. According to the company, the R7110U-40 is capable of signal discrimination of multi-photoelectron events ranging from one to five photoelectrons. Applications include high-energy physics, medical imaging, and other high-precision measurements where conventional PMTs are impractical.

"The R7110U-40 is one of Hamamatsu's latest technological innovations," said Robert L. Wisner, vice president of sales and marketing for Hamamatsu. "Its key features include the GaAsP(Cs) photocathode and multiple-peak capability."

Wisner added that the device is also a good candidate for applications requiring fluorescence detection or luminescence detection.

The R7110U-40 features low hysteresis over a spectral response range of 350 nm to 720 nm. Hamamatsu says that the GaAsP(Cs) photocathode yields a high quantum efficiency of 40 percent at 550 nm, allowing light detection with high sensitivity. Cathode sensitivity is typically 177 mA/w at 550 nm; typical rise time of the R7110U-40 is 1.3 ns. It has a capacitance of 120 pF and provides a high typical gain of 4x10⁴, says the company.

The device measures f20.0 x 18.0 H (mm) and has a f5mm active area. It requires 8000 Vdc and operates in a temperature range of -40^o C to +50^o C.

The R7110U-40 series of photodetectors is priced at $1,632 in small quantities and is available for delivery in 90 days ARO.

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