Quantcast
Channel: Laser Pointers
Viewing all 5560 articles
Browse latest View live
↧

Green laser pointer for full moon nights

June 1, 2018, 6:42 am
$
0
0
Greetings, first post on this forums!

I work as an astronomer for professional outreach sessions in public and I've been using a 30mW 532nm Flashlight Style 850 Type Green Laser Pointer Pen with 16340 Battery that I bought from laserpointerpro a year ago with great success on moonless nights.

A few months ago I noticed that the laser was nowhere near as efective on full moon nights as there is much more light, so I decided to buy a second 50mw laser from laserpointerpro. To my surprise, the 50mW laser wasn't brighter than the 30mW in any way.

I've now seen the introductory post in this forums, they've been very helpful at confirming that there are many consistency problems on most of the lasers sold today.


Could you please recommend a good quality green laser for full moon nights?

Idealy, my requirements would be:

1- Laser needs to be have a battery that lasts several sessions.

2- Laser beam should be bright, but any hazard of burning something or hurting someone would need to be minimized if possible.

3- If possible laser should have a wirst strap.

4- Shipment prices to Europe should be reasonable.

Thank you in advance for your input!
↧
Search

Looking for help | Legitness of a diode

June 1, 2018, 7:12 am
↧
↧

some "new" pics 6/1/18

June 1, 2018, 8:22 am
$
0
0
These pics were taken a few weeks ago using a plasma globe, a mirror or two, and glass spheres. By aligning the spheres the way I did I was able to get some nice abstract things going on inside the spheres with the plasma globe. I also used one sphere that was not clear, but dark green, and that created different effects. In some I used two 405nm 500mw thru diffraction gratings and the color in the middle sphere is yellow instead of green because of the different colored glass. Some shots are using a 473, 488, 495 & 505nm, and some have the normal rainbow colors.
I really like how these shots of the globe behind the spheres came out. My favs in this batch are 4474 and 4506.
Enjoy



DSC_4426_resize by brucemir, on Flickr



DSC_4427_resize by brucemir, on Flickr



DSC_4431_resize by brucemir, on Flickr



DSC_4433_resize by brucemir, on Flickr



DSC_4436_resize by brucemir, on Flickr



DSC_4438_resize by brucemir, on Flickr



DSC_4447_resize by brucemir, on Flickr



DSC_4452_resize by brucemir, on Flickr



DSC_4459_resize by brucemir, on Flickr



DSC_4463_resize by brucemir, on Flickr




DSC_4466_resize by brucemir, on Flickr



DSC_4468_resize by brucemir, on Flickr



DSC_4474_resize by brucemir, on Flickr



DSC_4480_resize by brucemir, on Flickr



DSC_4489_resize by brucemir, on Flickr



DSC_4493_resize by brucemir, on Flickr



DSC_4497_resize by brucemir, on Flickr



DSC_4498_resize by brucemir, on Flickr



DSC_4506_resize by brucemir, on Flickr



DSC_4509_resize by brucemir, on Flickr



DSC_4510_resize by brucemir, on Flickr



DSC_4513_resize by brucemir, on Flickr



DSC_4516_resize by brucemir, on Flickr



DSC_4517_resize by brucemir, on Flickr



DSC_4523_resize by brucemir, on Flickr



DSC_4528_resize by brucemir, on Flickr
↧

Super wide-beam laser

June 1, 2018, 8:26 am
$
0
0
Hi guys, I'm somewhat new to lasers, so please forgive my ignorance.

I'm working on a hobby project, and it needs a laser with a very wide + divergent beam. In short, it needs to be a similar beam width / divergence as a regular flashlight (e.g. say 1m wide at 3m distance, or wider?).

The idea is that it will be portable, and work just like an LED flashlight - only it will have the very narrow spectral width of a laser (1-3nm).

I've tried using an red LED flashlight (ultrafire 1505r), but the spectral width is too wide (20-30nm), which doesn't work for what I need it for.

To get that kind of narrow spectral width, it looks like I'd have to use a laser. But it's going to act like a flashlight, so I need a wide beam - not a small dot like I'd get with a typical laser pointer.

I've looked into beam expanders, but they seem to only go up to 10-20x, which is still way too narrow. Also, they seem to mostly keep the beam divergence low (if I've got that right - i.e. the beam although wide, doesn't get much wider with distance).

I've also looked into laser christmas light displays (which I think use diffraction gratings to spread the beam into multiple dots). This isn't ideal, as I really want an even, wide beam, as opposed to many dots. Also, I'm not sure if the diffraction gratings will alter the wavelength too much. If they increase the spectral width, or then that won't work either.

My final thought was to use something like a monochromatic laser projector: i.e., a system the (I guess) uses a mirror to 'draw' the laser beam over an area. Other than commercial RGB laser projectors, I can't find much. Given the thing needs to be portable (eventually), battery powered and not cost the absolute earth, this probably isn't a sensible option either.

Any help or suggestions would be really, really appreciated.

Thanks,
Adam
↧

Let’s Dream a little. What is Your Dream Lab?

June 1, 2018, 8:57 am
$
0
0
Everything starts with an idea that turns into a dream.

What is Your Dream Lab?
↧
↧

Hermes Laser Cutter - What type of laser is? How to drive the laser power supply?

June 1, 2018, 9:19 pm
$
0
0
Dear friends!

I found an old 98's laser cutter abondonated in an enterprise. I asked for it and they said me: Leave it at your workshop! It's a present for you! Ohhh yeahhhh, great!!!

I thought this machine Hermes VanGuard Laser 2001 is a classic Co2 laser cutter, working with old parallel port and MS-DOS or windows 9x software, the only thing I have to do is quitting the obsolete electronics and use a classic Arduino UNO with GRBL to free the machine and give it a new oportunity and this tool can be helpful for some projects.



I opened the machine, and I get really surprised when I saw the laser it have! Aparently, looks to be a CO2 laser air cooled... Only I have to understand how I can PWM drive the power supply and here we go! So I desarmed the power supply and I get rally surprised to see the quality of the electonics and these high frequency mosfets! Woooow! Why this technology?... I started to documente myself about this and I conclued this laser isn't a CO2 laser but a ARGON LASER!





The laser power supply pictures:







Here is the input to the "laser tube":



So my firt question is : What type of laser is it?

Unfortunaly, the machine miss some sensors and some unknown stuff (there is free conectors) and it is imposible for me to get working the machine in stock conditions due to these missing parts.

I tried to investigate to see what type of signals I can send to the laser power supply.





The big red and black cable is the general power, 48VDC. The yellow cable have 12VDC, and it is connected to the open door sensors, like a safety.

And the three little cables red, black, and white are going direcly to some microcontroller outputs on the motherboard of he laser cutter.

I tried to send some PWM and low-high states to these 3 little cables with an Arduino, nothing... Impossible to start the laser.

Unfortunately, there is nothing of informations in the web of these devices...

My second question is : Anyone know this brand of laser power supply? Is there a known diagram or instructions of how to use it? Or if there is some instructions of a similar laser at electronics level for the way of how to drive a power supply like that could be helpful for me to get working this laser.

Here some pictures of the FPGAs and Uc Main Board of the laser cutter:








Cheers :)
↧

Techhood Yellow laser module

June 2, 2018, 12:49 pm
$
0
0
I really hope no one on here has already mentioned this. I know a lot of people like Techhood and they have really good feedback so I figured id share what I just found on Ebay, I was searching for parts to start building my Pink or Magenta Laser module and stumbled on this 638nm+520nm module which actually good like its pretty decent quality :)

https://www.ebay.com/itm/200mW-Yello...item2136ada565
↧

Would appreciate some advice!

June 3, 2018, 8:32 am
$
0
0
Hello everyone,

I'm a complete beginner when it comes to lasers, so I thought this seemed like a good place to go for advice!

I work at a science education centre in the UK, and I'm looking to purchase a laser that can pop an appropriately-coloured balloon from about 20m away (but that won't pop a white balloon or one the same colour as the laser).

I would ideally like to receive the laser within 2 weeks (less would be even better!), but definitely within the month.

DragonLasers seemed to be well regarded in this forum's list of companies, so I wonder if the Spartan 200mW 532nm would be able to meet my needs:

LINK

Would it need some kind of focusing lens to be able to pop balloons from the distance I was mentioning?

If anyone has any other suggestions or retailers they could reccommend - I'd appreciate the advice!
↧
Search

Best new laser?

June 4, 2018, 1:57 am
$
0
0
Hi all, I'm Damien from Ireland and this is my first post here 😊

I'm looking to buy my first ever laser but I find there are so many to choose from!

I want to get a laser for the night sky and I guess it would be cool to light a match to..lol..but mainly for the sky.

I have done some research already and I came across this forum...it's a great forum 😊
So I was looking at laserpointerpro.com and I was nearly going to buy one but I realised that they seem to be very expensive when compared to sites like Aliexpress...e.g....303 model.

What I am looking for is a powerful laser, green, about 500mW or above, that will take a 16850 battery as I have 4 of them batteries with a great changer, adjustable focus, something that can travel a few Km and maybe even visible in day light. My budget would be no more than around $100

I am looking forward to your replies and thanks all in advance for reading this.

Have a great day,
D.
↧
↧

My Sharp 503nm Build!

June 4, 2018, 4:16 am
$
0
0
"Spring Green" in a Champagne Host






Here's my offering of the "Sharp 503nm SB1573N91" diode in an elegant champagne colored, hard anodized host.
I've decided to call it "spring green" since nobody can agree what to call some of these new blue/green wavelengths.

This is another build of mine that has seemingly been forever getting finished, it feels like they're all that way these days!
This particular version of the Sharp 503nm is a case positive diode, which limits the selection of available drivers; at the time that I built this, the "Blitz-Linear" was about the only available option, as far as I know.

I had some bad luck with my first two Blitz-Linear's, as the pot wouldn't adjust properly, then the second batch of drivers arrived, and the first one worked perfectly right off the bat!
I set my driver to 225mA, rather than the 250mA - 275mA that many are using, hoping for a little longevity and minimal wavelength shifting.

Another delay occured when I ended up stealing the host that I had intended to use for this build. :o
I was going to use a J/L Ti-B host, but I thought it would look better in my recently finished 493nm build.

I got lucky though, and found this classy looking champagne colored DIY flashlight build kit on "Kaidomain" for only $15.67; it's a good quality host with stainless crown and tailcap pieces, and nice smooth threads.
The only problem with ordering from a site like this and using free shippimg, is that it can take seemimgly forever to be delivered, about 3 1/2 weeks in this case. :(


Components Used For This Build:
  • "K-1" DIY Flashlight Host (Kaidomain).
  • Sharp SB1573N91 diode @502.9nm (Paul1598419).
  • 12mm Copper Module (DTR).
  • Blitz-Linear Driver set at 225mA (Survival Laser).
  • Custom Focus Adapter, Heatsink, and Battery Adaptor tube.
  • (2) 16340 "AW" Button Top Batteries.


Dimensions & Weight:
  • Length = 140mm (5.51")
  • Diameter = 25mm (.984")
  • Weight w/Battery = 155g (5.46oz)
  • Weight w/o Battery = 120g (4.23oz)


Measured Power Output:
  • 3 Element Lens = 76mW
  • Acrylic Lens = 84mW
  • G-2 Lens = 101mW


Finally a few photos of the construction and then some beams! :yh:


Kaidomain "K-1" DIY flashlight kit.


Host head piece before pill was drilled out for more heatsink room.


Blitz-Linear driver attached to diode/module, with a couple of added pieces of copper for a bit of extra heatsinking.


18650 to 16340 battery tube adaptor made from PVC pipe, with both the host, and the battery tube labeled for battery orientation.
Always mark your laser for proper battery polarity! :yh:


Exploded view with all components needed to finish the build.




Assembled and ready to try out. Showing added copper pad for better battery contact.


View of front showing extended heatsink which will support the focus adaprtor for smoother, less wobbly focus adjustments.


First light!






Everybody needs a helping hand! :D


Beam with swirling fog.









A Few Wavelength Comparison Beams! :yh:











That it folks, I hope you enjoyed the trip, thanks for looking! :beer:
↧

Greetings LPF

June 4, 2018, 10:53 am
$
0
0
Greetings. My name is Chris, I'm 35 years old and live in Victoria, BC Canada. I have enjoyed fiddling around with models and electronics for decades, building computers and little DIY electronics kits, ect.
For my next project I would like to build a handheld laser device, hence how I stumbled upon you guys.
The most important thing for me on this project is that I would like to build and operate the device as safely and responsibly as possible, so I am happy to have found this forum since I get the impression you guys feel the same way. I will post details on my project on a different thread.
↧

SITH 52 build

June 5, 2018, 11:42 am
$
0
0
By beginning of this year I was so lucky to catch an offer about an MS-SSW host. I desperately wanted a 465nm build so I use that host for it.

However, parallel to that I decided to have a greenie as well, later on. So I started the search for a suitable host.
My requirements were:
- robustness
- efficient heat transfer for long duty cycles
- maintanability (easy teardown and build)
- design (out of the ordinary solutions)
- power throughput (10A switch), low resistance
- 2x 18650 battery support

Most important of these were the heat transfer, power throughput and 18650 battery support.

After searching through the whole forum and requesting offers from valuable members I turned to something new.

A relatively new member named Trinh started to build interesting hosts so I asked him to make me a 2x 18650 brass host.
He agreed so I sent him some money so he could start the manufacturing.

I was not in a hurry because I was accumulating more money for the project. Still, 3 months later there was no sign of my host being made so I started negotiating with him about the deal.

I assume he was having some funding problems because he offered me a redesigned host, different from that one I ordered 3 months before.
Most possibly it was created for somebody else but I liked the new design so I agreed on the new deal.

The host arrived yesterday and now it is time to tell ya my impressions about it.

---

The host is heavy, very heavy and it feels like a club in my hand.
I am quite sure I can easily kill a person with it in a CQB situation :-)
That is why I named it as SITH.
* Slam in the head *

Basic data:

Length: 242mm
Total weight: 388g
Heatsink weight: 233g
Tailcap switch power support: 10A (at least I hope so, time will tell)
Side switch support: momentary / on-off
Tailcap switch resistance: 0.13ohm
Battery tube resistance: 0.08ohm
Battery support: 2x 18650

Now the good (pros):

- 2 different contact boards with springs
- 2 different side switches (momentary + on/off)
- design
- craftmanship (except the protrusion)

And the bad (cons):

- no o-rings at any thread
- tailcap threads protrude through it (manual lathe, no CNC)
- materials not polished
- no copper insert for 12mm module (just brass)
- brass head instead of aluminium (still OK for my build)

Further observations:

The craftmanship is surprisingly good for a manual lathe, except that one fault with the threads protruding the tailcap. That makes the tailcap a bit ugly when watching closely.

Trinh also provided an aluminium half-valve for heatsinking the driver but I am quite unsure where it can be fixed inside the host ??

Overall, I am satisfied until now. The price of 150USD (including shipping) is reasonable for this product, but still the host could be perfect by just a little more QC (that protrusion, yeah...) and a little polishing.
From a guy who started manufacturing nice hosts just a while ago, I think is acceptable.

Regarding the switches, time will tell how good they are, but in any case, it is not a big deal to exchange any switch in a modular host like this one.

I guess this host will serve me well as a laser handheld and if not still I can use it as an expensive and very dangerous weapon, a nice looking club :-)

The build will continue soon, I am ordering the 520nm diode and driver from DTR.
The Sanwu 3xBE for the project successfully arrived this week (THX Podo)

Attached Thumbnails
Click image for larger version Name: P1050619.JPG Views: N/A Size: 111.3 KB ID: 60480   Click image for larger version Name: P1050620.JPG Views: N/A Size: 122.7 KB ID: 60481   Click image for larger version Name: P1050621.JPG Views: N/A Size: 109.4 KB ID: 60482   Click image for larger version Name: P1050622.JPG Views: N/A Size: 115.8 KB ID: 60483   Click image for larger version Name: P1050623.JPG Views: N/A Size: 85.9 KB ID: 60484  

↧

18W-20W IR Laser Power Transmitter...

June 6, 2018, 4:40 am
$
0
0
Just watched this interesting EEVblog video of
a not yet on the market Power Transmission
product/project that I see some safety problems
with... It is claimed to deliver 5 watts of power
at ~5 meters using a Tracking Laser Beam.




Jerry
↧
↧

Boeing patents force field using lasers

June 7, 2018, 9:38 am
$
0
0
https://www.extremetech.com/extreme/...ve-shock-waves

"An arc generator will use high-intensity laser pulses to excite and heat air molecules in the space between the vehicle and the blast site. It then introduces an electric arc that travels along the electrically conductive path produced by the laser.

All that energy directed into empty space produces a bubble called a laser-induced plasma channel (LIPC). This plasma will absorb and deflect much of the incoming energy from the shock wave, thus leaving the vehicle in much better shape than it otherwise would have been."
↧

Need clarification on how a laser works? And how to build my own.

June 7, 2018, 4:07 pm
$
0
0
So I've been experimenting with lasers and I am wanting to build my own. So from my understanding. You have a laser Diode. Which is wired to a voltage regulator or voltage converter. Something to bring the voltage to match the specs of the diode. Which is then behind a lens at the correct focal distance. Then obviously a switch.

I also understand from the dissection of my green laser, that the diode is not a 532nm, but is an infrared diode which is somehow passed through a filter which converts it into 532nm. 532nm diodes don't exist. 520nm ones do however.

So If I where to purchase lets say an Oclaro HL63193MG 638nm 700mW Diode.
Wire it to a voltage step down converter which is powered by an 18650. Bring the voltage down to around 2.3v and wire it to the diode. Would it work? Then obviously finding a way to mount it behind a laser lens at the correct focal length.

I also know that diodes get hot and must be installed onto something to wick the heat away.

Also do you need different lenses for different colored diodes?

I would really appreciate it if someone could clarify if any of the above is wrong or add onto it.
↧
Search

Hi From Portland Oregon!!

June 7, 2018, 4:58 pm
$
0
0
I am 19 years old, my name is Zach, and i'm obsessed with anything electronics. I live in Portland Oregon. And I am here to learn more about lasers and laser technology's. As well as planning on building lasers as soon as I figure out wtf i'm talking about.
↧

488nm - A couple of setups

June 7, 2018, 9:46 pm
$
0
0
It's been such a long week...not a lot of time to play - found 30 mins last night and tried some stuff out.

These are all with a single 488nm Sharp diode.
I used a 'diamond' shaped prism, diffraction grating, and a few mirrors.

Enjoy :D

IMAG2849 by Lewie Wilkinson, on Flickr

IMAG2859 by Lewie Wilkinson, on Flickr

IMAG2864 by Lewie Wilkinson, on Flickr

IMAG2876 by Lewie Wilkinson, on Flickr
IMAG2872 by Lewie Wilkinson, on Flickr

IMAG2865 by Lewie Wilkinson, on Flickr

IMAG2867 by Lewie Wilkinson, on Flickr

Little Video :
↧
↧

Direct Doubling of 445nm /405nm diodes (cough cough)

June 8, 2018, 10:18 am
$
0
0
Ok so its a dream to think you could double these guys but can you? I mean if I put 6w of 445nm in and get 10mw of 222 or 202 out of it that would be something. Looking for 200-210nm for a nitrate spectrometer and I dont want high voltage or gas discharge. Hoping for solid state as it goes in my fish tank. Thinking to use uncladded fiber as the sensor and measure the absorbance from the water.

There is a second peak at 305nm as well. Any ideas to get there solid state and low cost. (couple hundred max)

If I actual finish an idea I'd be dangerous :yabbem:
↧

Airsoft Lasers

June 8, 2018, 12:14 pm
$
0
0
Im looking to get a laser for my airsoft gun but dont want anything cheep. I dont know to much about this stuff can anyone point me in the right direction
↧

Need a laser to use for training purposes...

June 8, 2018, 12:14 pm
$
0
0
I play airsoft and paintball and like to use lasers for target shooting and playing.. I want something more powerful for airsofting but not dangerous. Any good laser in the price range of $99 that wont be to harmful if gets in eyes.. I want a really high ranger pointer. Thanks :D
↧
Viewing all 5560 articles
Browse latest View live
Search