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Laserlands 638nm Red Laser Module

Beamer123

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Aug 19, 2013
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Hello Peers,

today I want to review a small laser module that I ordered from laserlands.net.
LINK: https://www.laserlands.net/diode-laser-module/600nm-640nm-orange-red-laser-module/635dot/3350-638d-1919.html

Here are some details on the unit:

- LD: Sharp 185mW single mode
- ncluded is the module with adjustable focus, a small fan, a TTL driver (12V DC input) -> Driver current was adjusted by laserlands
- Shipping to Germany took roughly 4 weeks and was free. It was packaged secure and nicely with lots of foam.
- Price: ONLY 20 USD!


I got this laser, because of its ridiculous cheap price and since I always wanted a SM 638nm laser. Unfortunately pointers with this diode have become super rare, because people go for the higher power LDs with the most aweful beam quality. :confused:

I am very satisfied with this laser, although it is much less handy than a pointer.

PROS:

- Price (How is this even possible? :oops:)
- Solid build quality
- Very thin beam for a diode
- Single glass lens!
- Awesome Beam Divergence (~0,5 mRad)

CONS:
- Driver was different than advertised (not a huge drawback imo)
- Beam has some scattered light on the sideline
- Focus ring is a little lose (can be fixed easily)

I have not yet tested the TTL function yet, but will do that together with a LPM testing soon.
There are two strange things, I don't fully understand with this laser.
1. How can the voltage be set on this driver?
2. I only measured 130 mA of current draw (without the fan), yet this laser according to the data sheet provided by Sharp states a working current of 215 mA. Can somebody explain how that could be? (Voltage on the LD output measured ~ 3,2 V)

I also bought a 510 nm 5 mW pointer and a 638 nm 5 mW from them through Aliexpress. These are also pretty nice :)

I hope you like my first little review and feel free to ask me anything!

IMG_8869.jpgIMG_8872.jpgIMG_8873.jpgIMG_8874.jpg

PS: The PWM controller is not included. but can be bought from Techhood on ebay ;)

Cheers
Philipp
 
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paul1598419

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These lab host/driver pairs are quite inexpensive. You can find single mode 505nm, 520nm as well as other wavelengths. Have you had an opportunity to measure the output yet? Some of these come in well below the stated output.
 

GSS

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Thanks for posting Beamer.. If it comes a bit under spec, all that counts is that your happy;)
As for the price, I guess the average Chinese worker might make 50 cents and hour working up to 16 hour days.:(
I just recently ordered another 532 200mw labby for $25 as I liked the first one. I'm sure when you joined these cute little labby's weren't even available..
 
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Alaskan

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I can't order anything from Laserlands through ebay, they blocked me after giving bad feedback to them for a dishonest listing, but this doesn't look like a bad deal at all.
 

GSS

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I can't order anything from Laserlands through ebay, they blocked me after giving bad feedback to them for a dishonest listing, but this doesn't look like a bad deal at all.
Still banned from buying for telling the truth wow..:(
 

paul1598419

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Yeah, these Chinese sellers take feedback on eBay very seriously. I have used it to force one to take my defective product seriously, but use it very sparingly for this reason.
 
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GSS

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I still am pissed at this Phaser prop maker Steve Wall that blocked all his Utube comment when he was confronted about his green laser prop doing 2W+ by a couple of us on this forum a ways back..
If someone buy's something for $950 from someone blocking all comments then it's on them then..;)
 




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