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Furthermore since the distribution of power in the various modes tend to change with power the reading may not be linear with respect to power even if the fiber isn t touched. For an isotropic point source 1 candela is equal to 1 lumen per steradian. For example see hammamatsu corporation thorlabs and udt sensors. The only demonstration of this that i ve actually seen was on a pbs nova show where a very high energy pulsed nd yag laser 10s to 100s of kj pulse firing at several shots per second could just barely raise a light weight a few ounces object against the force of gravity. A correction factor can be computed based on the photodiode response. I used a beckmann differential thermometer to measure temperature with about a millidegree or two. Measuring power of short pulses if your laser puts out short pulses 15 ns at a 20 hz rate for example a simple photodetector that is good for a cw beam may not provide all the information you need and may not even be accurate if its frequency response is too limited.
A electric field also helps so biasing the diode increases it sensitivity to long wavelength photons. A few cheapies i ve seen have just been black anodized plate with a thick dye layer. Since current is nearly independent of the bias voltage vcc is not at all critical. from leonard migliore lm laserk highschool hook up 320x240 jar. Or a screen with two holes in it. I ve used my power meter with 50 mw lasers having narrow beams without damage. Then the laser is turned off and a second pictured done to catch the surrounding areas.
I ordered the detector having asked the salesman if it could take a direct shot. Note that for the small area phootodiode linearity suffers above about 5 mw but the relative responses listed below shouldn t be very far off. Two of the most significant are 1 they have a sensitivity that varies widely with wavelength and 2 the upper limit for linear power measurement without attenuation is in the 10s of mw range even for a large area photodiode sensor.many simple low cost large area silicon pin photodiodes e. I dried it with forced air from a 12 v 80 mm fan at very close range. For the present discussion the photopic condition probably applies.