Laser diode and optics characteristics:
Type: Sharp LT020MD (index guided).
Wavelength: 780 nm.
Maximum power: 20 mW with TE cooling, 5 to 7 mW typical without (as in this unit).
Lasing threshold: 60 to 70 mA typical.
Electrical configuration: Case is common negative.
Collimation optics: Mini-optic rail with a C/CX or 3 element collimator, and an f theta lens. These optics (except the 3 element type) work with laser diodes up to 150 mW and 635 nm wavelength. The 3 element type works with 670 to 1300 nm laser diodes as well.
Note that this is only the front-end. It does not include the beam scanner (motor driven multifaceted mirror), field correction and directing optics, or beam position sensor - which would be present in a complete laser printer. The output of this module is a collimated IR laser beam. The actual focal point will be at the image plane (photosensitive drum surface) after passing through the other optics.