Description: A very powerful 5mW green laser. Fun, but don’t point in anyone’s eyes. These units include a momentary power button and two solder points for permanent on. The trim-pot adjusts the output power. We were able to push the current up to about 400mA where things started getting toasty, and very bright.
Dimensions: 56 x 11.5mm
Based on 3 ratings:
3 of 3 found this helpful:
This module puts out a powerful beam, providing roughly 5x more light in my application than a 7-candela LED! And I’ve only used it with a 3 V power supply (so far).
Note that it has a momentary-contact push button for a reason. If you operate it continuously for an extended period of time, the output dies off. I wasn’t watching the clock, but I would guess that I ran it at least 10 mins. Fortunately, once it cooled off, it recovered back to its original self.
My test environment was sealed, and heat build-up was promoted by that. If you are going to run this module more than 2 minutes at a time (with at least another 2 minutes in between), then you need to pay attention to cooling. Having good air flow may be enough for extended use, I haven’t experimented with that.
If you are going to run it at more than 3 V (other reviewers have run it at up to 4.5 V), then I would recommend either short duration with cooling periods or perhaps heat sinks and a fan.
All-in-all a very nice little part! Enjoy :-)
not only did the unit I received NOT have any data sheets included in the box, it didn’t match the picture on the items page!
The only information I got was the other members giving pointers on how to hook it up.
Hi, Most all of our products do not ship with printed documentation. We do post all documentation we have on the product page. You can find the datasheet above. As for connections - To power the laser: Apply power to the Housing (2.5V to 4.5V input voltage, max 300mA) And the spring is Ground
I purchased this laser from both a Canadian distributor that linked to Sparkfun’s link to the data sheet, as well as from Sparkfun directly. The laser I purchased from the Canadian distributor was their last in stock and was Identical to the one “previously” pictured here. The strange thing was the pot on the circuit board was set to deliver 380mA to the laser diode by default. I set it to 300mA and it was as dim as a regular red 3mW, 635nm laser pointer. I re adjusted the pot to deliver 350mA @ 3.25V and added active cooling. It seems to work fine now, albeit likely with a shorter lifespan.
UPDATE September 16, 2015. The picture above has been updated to match the laser I described, and purchased from Sparfun in my earlier review. One thing I want to add is that the Laser diode is only press fitted into the optical assembly, so you may want to add some epoxy or some other adhesive to keep it in place.
I tested the 4 modules I purchased from Sparkfun with the same 3.25V power supply, and all 4 of the modules purchased from Sparkfun draw 290mA of current, and are very bright. The beam is clearly visible in low light/darkness.
The only reason I didn’t give these a 5 is because one appears to be faulty. The beam that exits the lens on that particular module appears to be multi mode, TEM10. (two oval shaped beams next to each other) with a noticeable break in the middle. I tried cleaning the lens but it is not dirt, I confirmed this by simply spinning the unit around, then it was a solid circle TEM00 beam.
I suspect something is loose in the barrel of the module, perhaps the Nd:YVO4+KTP was improperly mounted and came loose. So basically I have to make sure that particular module remains in a specific orientation in order to work properly. All in all, this is an excellent laser for the price.