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Sodium laser visibility vs distance.

July 21, 2018, 11:34 am
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To catch up the 574 nm yellow laser took a tangent here.
https://laserpointerforums.com/f40/5...ml#post1539994


I've rephrase the question. Assuming naked eye 20/20 vision clear air with minimal particulates and dry desert air at what distance would this sulfur laser if projected horizontally at a matte white surface have an apparent spot brightness of a 6 magnitude star? This video I think covers (sorta) the question.
https://www.youtube.com/watch?v=DCQ2CbfGs6g

"Green laser pointers are amazingly useful tools for teaching the general public about the night sky, it's easy to point out specific targets and have everyone know what you mean. Sometimes people will point out satellites and even the ISS, so I wanted to figure out whether an astronaut on the ISS would be able to see lasers from people on the ground.

Here's the original video of the ISS Flash project: "
https://www.youtube.com/watch?v=2UoY1...
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Beam combining && Beam Splitting

July 21, 2018, 9:25 pm
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I feel this is a bit of a Rube Goldberg type of setup ... combining RGB with an XCube, then breaking B and R off with dichros - only to point them in the same direction again. My kids appreciated it :beer: (that beer is not for the kids, lol)

Depending on your timezone, hope you're all having a nice Saturday/Sunday!!

Wavelengths:
532nm
445nm
660nm

IMAG4797 by Lewie Wilkinson, on Flickr

IMAG4798 by Lewie Wilkinson, on Flickr

IMAG4783 by Lewie Wilkinson, on Flickr

IMAG4764 by Lewie Wilkinson, on Flickr

IMAG4777 by Lewie Wilkinson, on Flickr

IMAG4781 by Lewie Wilkinson, on Flickr
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Three (3 ) Axis Adjustable LD Mount

July 21, 2018, 11:09 pm
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Well...I concluded that this LD mount deserved a separate thread !
!! See attached : THP-CDB-V6 drawing.

The design was greatly inspired by Trinh H P

The design builds on previous proposed designs and has not been built yet.

A Proof of Concept will be done.

The LD mount uses two (2) rotating cylinders. A 12mm CU module w/LD....is set within an 18mm rotating collar @ 90 degree.

For Pitch adjustment, an 18mm collar is positioned within the main mount body. This collar is then positioned/rotated....up/down... to adjust to the perfect Pitch. Once the pitch is set.... a clamping bolt is tightened to fix the position and provide the best possible heat transfer between the collar and the main mount body.

For LD Rotational alignment, the 12 mm module is positioned/rotated within the 18 mm collar unit. Once the Rotation is set...a set screw that is aligned with the 18 mm collar axis is tightened...and the rotational alignment is fixed.

Finally, for Yaw adjustment, the main mount body will be bolted to a standard Base/slotted foot plate which can be shifted left/right to achieve the best Yaw alignment. Once aligned....Fix the bolts to secure.

We have finally covered all the required degree's of movement for an LD mount...in hopefully the smallest and most simple design possible

All components will be Copper. I will machine the first unit within the next 30 days.

Thanx to all that have pushed the envelope so far !!

Drawing now attached.

CDBEAM :wave::wave::wave:

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Hi everyone

July 22, 2018, 8:35 am
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Hi everyone,

I've only recently started working with lasers for experimental / research purposes. I've also had a chance to receive advice from a more seasoned member, and the reason I've decided to join. Laser diodes are really cool to work with from my experience so far and a good way to getting into laser work. Its hard to get out of the lab!

Plenty of very useful information on here. Hope to be able to contribute in a good way.

Have a nice day
MattBlix
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Missing DTR ...

July 23, 2018, 6:01 am
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Hello forum.
I need to buy a lot of material from DTR but I never receive response from him.
I tried by mail, I tried here by PM .. nothing.
He is not in holidays because I can see a recent activity of him in the forum.
It seems that he want to avoid me and I cannot understand the reason, really.

Anyone can tell me a valid alternative for the diodes? I need to buy a lot of material, indeed.
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Blue Katana, a 70 watt handheld project!

July 23, 2018, 11:33 pm
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Hello forum.
I started another ambitious crazy project called "Blue Katana", a "portable" laser with 9x NUBM44-81/NUBM47-A1 450nm diodes.
Since the beam diodes angles cannot be tilted, this will be a build suitable only for short focusing. I plan to reach a focusing range from 1/2 meter to 10 meters max.
I will use 75mm Aspheric Condensor lenses from Thorlabs inside a lenses tube.
The system will have two lenses, one fixed and another movable back and forth like a beam expander.
The head will be massive, 100mm diameter!
Every diode will be pressed on a 20mm copper barrel, and every copper barrell will be pressed into an hole made in the aluminum head with extremely perfect fit.
I will use 12x18650 VT5 hi-drain cells, 4 cells in parallel every battery holder and three battery holder in series, so I will obtain high current and high voltage at the same time.
For the momment I have already prepped some pieces .. take a look:



This is a preliminary handmade pic of the head:



This time I will create the build alone, without the help of the big guru CDBEAM777. :na:
This will be a very pricey and time-consuming project .. stay tuned and follow me in this odyssey :wave:
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Suggestions for components????

July 24, 2018, 3:49 am
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I'm planning to but the PL520B and PL450B laser diodes, but since this is my first time with building lasers, I need help in deciding which drivers, collimating optics and heat sinks would be suitable along with these diodes. I was thinking of LDD200P driver from Wavelength electronics. Any suggestions??
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Hello!

July 24, 2018, 4:25 am
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I have recently started working in the field of biophysics and so I came across stuff about LASERs and LEDs that I needed to understand. I have made little progress... ALso this is the first time I've registered on a forum, and I'm also learning how things work around here. It's a fun (and informative) place from what I can tell so far.. plus I never could have imagined so MANY people had LASERs as a hobby!!!! That's like a really big surprise for me

I hope I'll someday reach the stage where I can not only ask but also answer questions on LPF :)
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What would be an approximate "safeish" mw level.

July 24, 2018, 11:26 am
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I know the 5mw thing, however I doubt that 5mw is totally safe but 6mw suddenly causes severe retinal damage. For a greenish wavelength region laser what mw would most likely not cause permanent damage assuming that: 1. The beam did not hit anyones eyes directly but assuming a highly reflective surface (chrome or a bathroom mirror or something), and 2. that it was only for a short instant (the amount of time it would take to blink). I was unable to find a scale of reference for laser injuries.

edit: when I say "not cause permanent damage" I mean nothing that would do worse than creating a blurry patch or ghost image for 10 or 20 minutes.
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Update/advice: full custom 2w 462nm build

July 24, 2018, 4:08 pm
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I posted a while ago asking about drivers, and more recently about beam dispersion. So far I've been out of my element, but we're into the mechanical design so it's my time to ask a few questions but also show off a bit.

This is my design for the host. As shown, it will be 11.5" long and 2" around the heatsink.


Cutaway with callouts of components:


Key features:
  • Adjustable power by rotary encoder rather than potentiometer, ensures that laser is always at safe levels when powered on
  • Encoder knob has integrated LED which will be programmed to change from green to red based on power output
  • Encoder knob also has a pushbutton which will be programmed to jump straight to minimum power
  • Power indicator LEDs on the main power switch, the firing switch, and power knob
  • High power interlock allows operation without key from 0-50mw (should I set the limit elsewhere?), 0-2000mw with key
  • Thermal isolator (black) separates heatsinking components from handle and electronics

To do:
  • Finalize electronics mounts
  • Recess power knob a few mm if there's space?
  • Battery tray for positioning and easy removal

I have a few questions about it, and wanted some pro input.

1. Is the heatsink total ridiculous overkill? I was originally planning to use the fan to force air through the host past the aluminum fins, but I happened to have a hunk of brass tube available so I threw it on there as a thermal mass and because it's pretty. Should I ditch the fan? the brass? both? I don't have specific plans to upgrade diodes, but the driver board is rated up to 8A with proper heat sinking.

2. Should I be concerned about the focus head floating on the laser's own focus threads? I would have a hell of a time getting fine focusing threads into those 1.75" bores, but I'm a bit worried what a drop on its nose would do to the laser housing.

3. What are your general thoughts on a software-limited interlock? I want to be able to remove the key and not worry about letting people handle it without glasses, but still have the ability to access the full power of the laser when it's appropriate. The lock is rated to handle the full system power, but I'd prefer to do it the other way.
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Questions about blue laser(kinda long) Noob.

July 24, 2018, 5:44 pm
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Hello to all, this is my first post. I am glad I found this forum. I am sure this has been posted but the search didn't bring me to a conclusion. I ordered a blue laser on wish that's rated 1.2 to 5watts. I hoping at least for 1 watt. I really wanted a strong laser that I could see the beam. I now realized if it truly is 1 watt or more comes huge responsibility I never thought of when buying this. It comes with glasses and I hope it sufficient until I can afford a decent pair thats affordable. To my questions:
1. You see everyone on the net videos shining these things around all the time with out goggles like it's ok. Is there a simple formula to go by as far as reflected light on a wall/surface. Meaning is there a safe distance you can be to shine this 1 watt laser(cross fingers) where not wearing safety goggles isn't required. Like I am a radiographer, and we use like inverse square law ect. just curious.
2. How far away is a safe distance to look at the side of the beam lets still say around 1 watt. Like if I said to my wife look at this beam it's so cool, I shine it into the sky or at a tree far away.
3. I know a laser is beam photons traveling in a straight line, is there any back scatter what so ever of any ray, uv to infrared. I'm curious If I am shining it out side and it's foggy, great easier to see, but to see it easier means it's reacting with the fog, so back scatter of diverging rays is taking place are my eyes safe with out goggles like people say as long as I'm shining it far away or straight up.

Sorry this post is long, I've always thought laser were cool, never having one except on my ar 15, I started getting intrigued more. I haven't really read anything on lasers yet, just me thinking and I could be so far off base. I just googled and found this site as soon as I ordered it and these are the ?'s first hit my brain, so I wanted to post before I forgot.

Thanks, CHeeerssssssssssssssss:wave:
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Suutable driver for LPC-840

July 24, 2018, 11:57 pm
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Hello .Im new here and have question about the suitable driver for LPC-840 diode. I saw on Alaskan replied on the thread
https://laserpointerforums.com/f50/m...6-a-99171.html
He told that LPC-840
"Working Current: <320-355mA
And Working Voltage:2.4-3.1V"
Any suggestions for the driver ? (eBay link please ).Thanks
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Tesla with laser

July 25, 2018, 3:07 am
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Ive been meaning to post this for a while now. Just thought some of you might appreciate the sparks and laser beams! ;)

The tesla was a kit off ebay and the fist laser my Sinner Cypreus IIIB 465 with 10x beam expander. The other colours are from my RGB PTEG 3D printed laser.:beer:











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Question about 301 Lasers

July 25, 2018, 7:47 pm
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So I just got a 532nm 303 and a 650nm 301 laser and while the 303 is working perfectly I'm having problems with the 301. Basically I want to focus it into a small dot but the focusing lens is causing a bunch of problems. It moves around and rattles even though my 303 is fine. Is mine just defective or is this just how 301's are?
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A decent laser pen distributor/manufacturer

July 26, 2018, 5:30 am
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Hey guys..Just joined here. Ive been searching for a laser distributor for quite sometime now. All reviews I read on most of these places like Wicked laser or Biglasers have whole load of negative reviews.
If you can guys can help in recommending a respectable company where I can get myself a decent 100-200mW 520nm laser pointer, it be much appreciated.

Thanks Decameron
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Constant green laser art project

July 27, 2018, 5:22 am
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Hello!

I am building an art project for a desert setting. I want to build a small motorized gimble holder and constantly point at a star/constalation. From what I've read in the forum most lasers are not built for continuous operation but should be able to do it.

I'm asking for your help in choosing a laser that can work 8 hours a day for a week or so.

I will connect an exterior power source (that will charge with solar). I can also build a cooling system but would rather not. My initial research showed that green lasers should be good for this use case, but I might be wrong. My budget is humble.

Thanks!!
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Recent advances in self-frequency-doubling crystals

July 27, 2018, 7:21 am
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An in-depth article that may give some clue how yellow light is generated.

https://www.sciencedirect.com/scienc...5284781500091X

Journal of Materiomics

Volume 2, Issue 1, March 2016, Pages 55-65<br>

open access
Recent advances in self-frequency-doubling crystals
Author HaohaiYuJiyangWang


https://doi.org/10.1016/j.jmat.2015.12.001Get
rights and content
Open Access funded by The Chinese Ceramic Society
Under a Creative Commons license<br>

Abstract
The self-frequency-doubling (SFD) crystal is a representative of multifunctional crystals. In recent years, SFD crystals and lasers have gained renewed attention based on the progress on SFD crystals and lasers and Nd:RECa4O(BO3)3 (RE = Y or Gd) crystals, with SFD lasers becoming commercial products. Here, we review the advances of SFD crystals and lasers, including the basic selection rules, theoretical analysis and recent progress of some potential SFD crystals and lasers. The Nd:RECa4O(BO3)3 crystals and lasers are highlighted, and their applications are also proposed and discussed, which may provide some inspiration for the further development of the SFD field and multifunctional materials.
We review the advances of self-frequency-doubling (SFD) crystals and lasers, including the basic selection rules, theoretical analysis and recent progress of some potential SFD crystals and lasers.
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M462-Flex pen sale

July 27, 2018, 8:26 am
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Hi guys

I have this lovely alloy pen I just finished
Originally was planning on a dual battery
SXD host but ended with a Flexdrive and
One 14500 and spacer!

Still great though for someone wanting
Option of changing diode and driver later
On.

Brand new M462 diode from DTR and 2
Element lens, email or PM for price!

Thanks for looking!

https://youtu.be/KNnEHlW5vls

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some "new" pics 7/27/18

July 27, 2018, 9:27 am
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These pics were taken last month using many mirrors, magnetic balls, a fan diffraction grating, and a glass sphere toward the end. Two rainbows of 460, 520, 589, & 638 were used, and the ones that are just greenish blue are a 488, 495, and 505nm. I set the bottom mirrors up in a triangle and had the eight round mirrors for the "rainbow" colors. Some very nice images inside the glass sphere toward the end. I shot this set up the following week too adding some stuff, but here are these. Enjoy


DSC_5070_resize by brucemir, on Flickr



DSC_5073_resize by brucemir, on Flickr



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[HELP] Sci-fi Laser 2.4 mw

July 27, 2018, 10:14 am
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Hello dears,

Is my first time here in the group, I'm from Brazil and I would like your help with my laser bought from Sci-Fi lasers (501B 2.4mw) 3/4 years ago.

Recently I loaned it to my uncle and I can imagine he reversed the batteries and my laser died. Now, when I put the batteries and turn it on, the light is too weak. :undecided:

There is anything I can do at this moment? Should I replace the diode or buy a new one from another company? (Specifically Sanwu)

I really faced a lot of problems to receive this laser when I purchased them, our brazilian authorities is a sh*t and very strict to import laser products, I had lucky to get it through...

I count on your help guys!

Roger.
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