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The spectral response of the G series devices is similar to that of other high-quality silicon photodetectors, covering the range from the near UV to the near IR. A glass window is standard; however, an optional quartz window is available. Relative spectral response is shown as a function of wavelength in Figure 4. Note that relatively high sensitivity is maintained even in the blue end of the spectrum because there is no interfering structure covering the diode. As most applications for these devices (OCR, fax, etc.) utilize visible light, the sensitivity and uniformity of response are specified using a source with the spectral distribution shown by the dotted line in Figure 4. This spec;tral distribution is produced by filtering a 28700K tungsten source with a Fish-Schurman HA-11 heat absorbing filter l mm thick.