The Samsung SLD63518262 is a InGaAlP laser diode with quantum well structure. It has a built in photo diode for monitoring the laser output for use in automatic power control (APC) circuits. The common case pin is laser diode cathode and photo diode anode.
Output Power: 5.0mW typical, 7.0mW maximum
Wavelength: 637nm typical, 645nm maximum. RED
Operating Voltage: 2.2 Volts typical
Threshold Current: 30mA typical
Operating Current: 40mA typical
Monitor Current: 0.3mA typical.
Operating Temperature: -10 to 60 deg.C
Package: TO-18, 5.6mm diameter base
Factory spec sheet found HERE
Note: Due to the sensitive nature of laser diodes, there is no warranty or exchanges on these items.