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DX SDLaser 301 (50mW Focusable) [New Pics] + Divergence

siqueirah

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Hi guys,

This is my second review. I'll try to do my best.

(If you want a short review, scroll it down)

I've been waiting for a long time to get this laser. I was really excited about it. It's a 50mW rated laser for a great price. Everything points to be a up to spec/overspec laser.

DealExtreme: $31.90 Focusable 50mW Green Laser Pointer with Safety Key Lock (1*18650 Included)
The price was $31,90 .

Shipping/Packaging
It took arround 38 days to arrive here in Brazil, due to the volcano problem. Also, DealExtreme took a long time to ship the item. There was a confusion: First, they said it wasn't in stock, and then a few days later, it was Shipped. I chosed the cheaper option (Registered Airmail). It came in the usual yellow bubble envelope.

I chose also the $0.1 service that helps my laser pass through customs.

The envelope was well closed. Due to the poor protection, the box was a bit damaged during the shipping.



Contents
Like any other chinese lasers, this box was as much ordinary as possible. Even though, it does what it's supposed to do.

A mini LED keychain came as a gift.

Inside the box there's the laser, the tailcap, a Ultrafire 18650 and the keys.

This is my first "real" laser, so I have never seen a 18650 before. This one was intact and almost fully charged (3.85v)


Host Appearence / Feel

The first thing I like about this laser is the safety key lock.

It works very well, and the key can be removed either in open or lock position. It comes with 2 keys.

I really liked this black host. It has what they call "anti-roll" device, what prevents the laser from slipping from your hands. It works. For that purpose, there's also a little strip (don't know how to call it)
The laser feels a lot heavier than the New-Wish style ones I've used. Since it's full aluminium, it provides a better heat spreading. The small button temporary switch is plastic but it's solid.


The head came sealed to prevent dust from going in.


There's also a part that can be removed to allow the usage of shorter batteries.



The size:
It's arround 15cm long and the diameter is 2cm.



Keylock detail


Extra pic:


I removed the focusing ring



Visibility/Output
As the other review say it gives what it promises. I can't really state that, since I don't have a LPM, but it's really bright. The beam can be seen daytime (not very well) and it's amazing during the night. (Much more than the pics show)
The dot (TEM00. No mode hopping):

Beamshots:
New Beamshots (more will be added)

Old Beamshots





Divergence
When focused to infinity ( minimum ) the divergence is 1mRad, what I think is a good value.
When focused to burn ( big dot) the divergence is 22,7mRad.


Burning

At first I couldn't burn anything, but then I learned how to focus.
It can burn matches, cut's duct tape (takes a while), pops balloons and everything else.
Here's a video.


Current Draw
My results were the same Mik got. This laser's driver draws 320 mA.


A word about duty cicle
Well I've run my laser uninterruptly for 5 minutes. In the beggining the laser was cold. After 5 min it's "not cold", but not warm or hot.
Ok, it might be bad contact between the heatsink and this part of the laser. I touched the whole laser inside, outsite, the battery, and everything was as cold as usual.
I assume, then, that the laser has a fairly long duty cicle.


It's a great laser for the price. Good for the ones who are starting. If you want a cheap laser, but not a poor quality one, this is the one.

Summary

Pros: - Nice Design

- Full Aluminium Host
- Anti-roll Host (grip)
- Security Key-Lock
- Easy to focus
- Can be enshortened and used with both 18650 and CR123A.
- Feels heavy and solid
- Bigger than pen-style
- Appearently good heatsinking

Power:

- Up to spec / Overspec (>50mW)
- Lights matches easily when focused
- Pops baloons
- Smokes black things
- Appearently long duty cicle
- 320mA

Beam and Dot

- Straight Beam
- Low Divergence
- TEM00

Cons: - It's not a branded laser.
- It has too much IR.


Thanks for reading.

When my tripod + clamp arrive I'll add more burning videos, beamshots, and divergence.
 
Last edited:



Eudaimonium

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Re: DX SDLaser 301 (50mW Focusable)

Nice review, +rep given, though please remember what I said about pics ;)
 

ideas

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Re: DX SDLaser 301 (50mW Focusable)

It looks like the beam is TEM01?
have you seen double beam spots when you shine the laser on a surface far away?
Or is it just the way the photo makes it appear?

ps nice review and nice informative pictures!
 

siqueirah

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Re: DX SDLaser 301 (50mW Focusable)

Well, I think it's TEM00, but I don't understand as much as you guys.
I took another pic for you to decide.
3m distance:
 

Mik

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Re: DX SDLaser 301 (50mW Focusable)

This laser is a top pick in my book for a budget green laser. Good battery option, focuses (somewhat) mine is overspec.. pretty tough to beat considering the price.
 

jeffd

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Re: DX SDLaser 301 (50mW Focusable)

Looks like you got an over-spec one. nice!
 

siqueirah

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Re: DX SDLaser 301 (50mW Focusable)

A word about duty cicle
Well I've run my laser uninterruptly for 5 minutes. In the beggining the laser was cold. After 5 min it's "not cold", but not warm or hot.
Ok, it might be bad contact between the heatsink and this part of the laser. I touched the whole laser inside, outsite, the battery, and everything was as cold as usual.
I assume, then, that the laser has a fairly long duty cicle.
 

3zuli

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May 30, 2009
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Re: DX SDLaser 301 (50mW Focusable)

I also need a beter multimeter, 'cause my only measures up to 250mA and the laser has more than that.
get an 1ohm resistor, connect it between the battery and case and measure the voltage in mV across it. the mV is equal to mA in this case (for example 300mV=300mA)

It looks like the beam is TEM01?
have you seen double beam spots when you shine the laser on a surface far away?
Or is it just the way the photo makes it appear?
it seems he has shaky hands :)

you can determine the mode according to this pic:
 

siqueirah

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Re: DX SDLaser 301 (50mW Focusable)

I knew the picture, and I still think it's TEM00.

Well, as you said I measured the current.


Current Draw

My results were the same Mik got. This laser's driver draws 320 mA.
 

Benm

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Re: DX SDLaser 301 (50mW Focusable)

I think camera motion is problem with these pics - the laser itself might be tem00, or a very strange failure mode.
 

siqueirah

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Re: DX SDLaser 301 (50mW Focusable) [New Pics]

Well, I think my clamp and charger will arrive this week.
I'll be able to measure divergence, record better burn videos, better beamshots etc

BTW, 2 new pics added
 

mpmsfilho

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Re: DX SDLaser 301 (50mW Focusable) [New Pics]

Siquera você mandou vir por EMS ou por correio normal mesmo?
 

siqueirah

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Re: DX SDLaser 301 (50mW Focusable) [New Pics]

Correio normal(Embora demore 1mes). EMS é taxa na certa.
Procure a comunidade DealExtreme e FocalPrice no orkut para se informar melhor.
 




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