🚀 go-pugleaf

Toshiba has a number of nice visible red laser diodes.  The
devices are capable of continuous operation with outputs of about 1
to 3 mW.  The driving voltage is only a couple of volts with
currents in the low mA range.  The diodes can be operated from
sources such as 9-volt batteries without many external components.

The Toshiba diodes are four terminal devices that have a monitor
photodiode built in for regualting output level.  An op-amp and a
few resistors and a capacitor to achieve slow turn-on are all that
are required.

There are several different grades of laser diodes available in
various spectral output widths and beam patterns.  The beam is
typically an elipse with about 2-3 degrees in one direction and
20-30 degress on the other axis.

Of course, eye safety considerations must be followed.  We're
considering building some laser pointers for use in teaching labs,
but are still looking into the safety issues.

Call your local Toshiba distributor and ask for the visible laser
diode spec sheet.

The current crop of laser diodes is a far cry from the IR output
monsters of a few years ago that could only operate in pulse mode
and required 25 or more amps to lase.


Bill