1919-R User Manual
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6
Photodiode Sensors
For a list of the available Photodiode Sensor models, see
Warning:
Before using the Photodiode sensor for power measurement, check that your laser
power, energy, and energy density do not exceed the sensor ratings. See
When a photon source, such as laser, is directed at one of the 918D, 818DB, or 819C/D integrating
sphere series Photodiode detectors, a current is created proportional to the light intensity and
dependent on the wavelength.
The 1919-R display unit amplifies this signal and indicates the power level received by the sensor.
Due to the superior circuitry of the 1919-R, the noise level is very low. As such, Newport sensors
with the 1919-R display have a large dynamic range from nanowatts to hundreds of milliwatts.
Newport’s 818 and 918D series Photodiode sensors come with attenuation filters, while the 818-
xx-L-FC/DB series low-cost fiber optic detectors do not. Some of the 819C/D series integrating
sphere detectors utilize the 918D series detector, which has an integrated filter. Refer to their user
manuals and websites for the specifications. A general guideline is to use the filter when the
power level of the source is more than a few mW to avoid sensor saturation. When saturated, the
legend "OVER" will appear on the screen.
Newport Photodiode sensors have built-in wavelength correction curves for measurements either
with the removable filter installed (filter-in) or removed (filter-out). These curves are stored in the
sensor EEROM. The correction curves, with a resolution of 1nm, ensure that the power reading is
correct at all laser settings.
To simplify changing from one laser setting to another, the user can program up to 6 different
wavelengths to be available from the screen menu. Use the
your laser settings.
Topics include:
Operation of 1919-R with Photodiode Sensors
Measuring Laser Power with Photodiode Sensors
Averaging and Measuring Very Low Power Measurements
