ECS 2000 Manuel D'utilisation page 16

637 nm diode type:
Pure red with clear beam (1,5mm and 0,5mrad), the finest quality
available on the market as of today. It replaced the old 640/642nm
diode. It appears in modules between 170mW-20W.
638 nm diode type:
Similar to the red tint of the 637 diode.
The beam is slightly wider (4 × 4mm and 2mrad).
650 nm diode type:
Dark red with a very vivid tint, yet the diode provides only fair quality.
The beam is very wide and due to this a lot of power (in galvos) gets
lost. It can still pass for being economial when used with low power.
The diode can appear 5mW to 1.5W.
The typical output beam is 8 × 8mm and 3mrad.
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