The laser diode is different from the light
diode and a very small die area. This leads to a significant concentration of
power, so even a short-term excess current through the junction diode and can
lead to burning of the crystal is not warm and the inherent radiation.
The most convenient for carrying out of
experiments 250mw red laser, available in every computer disc burner for DVD-ROM drive.
Take a drive with worn mechanics, more unsuitable for the intended use. Make
sure the device is de-energized and with nothing connected, disassemble it and
remove it from the moving carriage, two laser diodes as well.
Both diode and check in action. To do this,
pointing the lens unit on a sheet of paper, connect the battery from the
motherboard. The laser has three pins, two of which are connected to each other
- they were freezing, the remaining terminal is the positive. Choose one of the
two LEDs that illuminate leaf bright and saturated red. The second device is
the infrared. The weak red light in his - side, the intensity of the infrared
is much higher, so it is also impossible to guide the eye.
The laser, which turned red, set on a
homemade radiator. For this purpose, the aluminum plate of about 4 mm diameter
drill hole such that the device hardly entered therein. Between the body diode
and the heat sink and apply a thin layer of thermal paste. Having turned away
from the laser itself, plug the charger into the network. You will see the
light. Try using a plano-convex or biconvex lens to focus it on a sheet of
fusible material which absorbs red color. It will last a few seconds to a point
and trace remains in its place hit. BTW, you can select the red laser at
Banggood. Besides, you can easily get other electrical accessories (e.g. microwave synchronous motor) there with high quality and reasonable prices.
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