Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers



Buyer beware.

RedCowboy

Well-known member
Joined
Jul 10, 2015
Messages
9,243
Points
113
50mW 532nm Green Laser Diode Module with Driver Stage Light Heatsink | eBay

High Quality 200mW 532nm Green Laser Diode Module Green Beam Lab Stage Lighting | eBay

Look at these 2 ads.

Both use the same stock beam pic running into fog.

Both have a working current of about 1w input, now the driver is not 100% efficient, the 808 pump diode is not 100% probably not 50% efficient and typically it takes about 4-5x the pump diode power to get 532nm out of the crystal set.

Some crystals can be a little more efficient but not enough to put out more than is put in LOL, the 200mw claim is impossible based on his own PS reading and specs, the seller want's to show that the driver can regulate down from 4.3v in case you have a topped off li-ion battery but proving there is no way his product can meet the 200mw output.

Two 40-60mw modules one with a fake advertised output and 4 times the price.


If you think about a 1W dpss 532nm it will need at least a 4W 808 pump with efficient crystals, then there is the efficiency of the driver.
A single 18650 charged to 4.15v will do well if it's good quality to put out 4amps with very little drop into 1 ohm. " But not for long, just read the sustained discharge rate when you buy vs the max discharge rate. " I have only seen this with IMR/INR cells, even NCR's sag into 1 ohm and can't hold a 4a draw. Into a half ohm who knows, but wear your oven mits when you take it out.

A 1w 532 using only a single 18650 is asking a lot of that battery, it may do it but the battery is getting a workout, especially if it was designed before IMR/INR

Anyway I like beam quality, but a lot of these 532 have the lenses tuned to lighting a match and not infinity focus.
I'm ready to step up to the Direct single mode NDG 4216 and be done with the temperamental temperature problems and mode hopping, maybe a cyl corrected 7475 would be the better 1.25 w green HH, dpss as the power goes up gets tricky to keep happy. Yes I have a dozen surviving 532's but I have a box of about 100 dead ones. As for 5000hours LMAO Not Even Close! Not in HH in bench top yes.

In stage lighting/lightshow apps with TEC they do fine.
Just imagine the 808 pumping that 4w 532 Alaskan has for sale, it must be close to 20 watts.
 
Last edited:



Vision

2
Joined
Jan 30, 2016
Messages
392
Points
28
I was just about to buy one of those for the liexpress host I made a thread about! Damn. Thanks.
 

RedCowboy

Well-known member
Joined
Jul 10, 2015
Messages
9,243
Points
113
Pman said he had done well with ....Fastec I think? But I think he pot mods them, but don't quote me on that.

Anyway I need to add at least one of these neat little direct single mode nichias to my collection, plus they are 515nm so that's sets it apart too.

This one
https://sites.google.com/site/dtrlpf/home/diodes/100mw-nichia-ndg4216-515nm-laser-diode


If you buy a dpss 532nm get one from podo for 15 bucks or an ebay seller for 15 bucks, just read the input specs, a lot just raise ouptut numbers and the price thinking we are stupid, but you get the same laser.


Just look at the specs on this 500-700nm dpss532 it takes in almost 10 watts of power, you have to dissipate 9 watts of heat, that's half as much as the new 7W blue, so it's doable but duty cycle will be finite without tec or a massive sink. It's not a pocket pet, well for short burst, I will be happy when single mode directs can break 1w and the way to get them there is to buy the 100-200 mw single mode they just made for us, the ndg4216, I would have already jumped on it but I have a dozen pedigreed 532's but I went through several dozen to get them.

http://www.ebay.com/itm/DPSS-532nm-...297117?hash=item1e8c9fba9d:g:r60AAOSwDk5UKvOv
 
Last edited:

Laser Chick

Well-known member
Joined
Jan 26, 2015
Messages
1,265
Points
63
I agree. I have about 15 green 532nm lasers left and even though they have beautifully tight beams that appear to go on forever and can burn and be seen really well because of that. The 532nm lasers very nature does make them picky to temperatures above 95° and below 35° and you have to be careful not to drop them.
 




Top