- Sep 20, 2013
Chris, by expander lens do you mean a collimator lens that is further away giving the divergence of a BE? I see you got more of these OPSL laser modules.
I did use the original expanding lens, it looks like I have a long focal range but collimating is actually about 8 mm from the expanding lens. The reason why it looks like I have a long range is because the pointer chassis is extended to make room for the door cover. Otherwise I could of cut another 30mm or so off the total build length.Heater voltage is 1.5V-2.0V. Try 3.0V at your own risk.
Not all of them have the output expander lens, mine didn't but another user on Discord did have one on his.
Same power for mine... LD running at 400 mW and heater current optimized, I got close to 100 mW (see picture... highest point I have seen was 108 mW). However, you really have to look for the best maximum since there are several other local maxima which are considerably lower.I got 90mW - 110mW of power for different units at spec. current max (480mA, 23°C, Heater = current optimized at ~60mA).
Fully confirmed by the above measurements: active heater control seems necessary if you really want max (or lower but stable) output power. On the other hand, the modules stay "bright" for quite some time without active heater control, even with power downs/up and over multiple days.I was dubious that the heater could be controlled by setting the current for a standard amount instead of measuring the temperature and setting it that way.