The Liteon LTLD505T is a AlGaInP 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.

Specifications:

Output Power: 5.0mW recomended maximum output
Wavelength: 650nm typical, RED
Operating Voltage: 2.4 Volts typical
Threshold Current: 15mA  typical.
Operating Current: ≤ 25mA.
Monitor Current:  <100uA, 20uA typical.
Operating Temperature: -10 to 50 deg.C
Package: TO-18, 5.6mm diameter base.
The common case pin is laser diode anode and photo diode cathode.

Preliminary factory spec sheet found HERE
Large quantities available.

Note: Due to the sensitive nature of laser diodes, there is no warranty or exchanges on these items.
          These are new (unused) old stock diodes, in factory packaging.