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Why and when do laser diodes shift in wavelegth?

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Hello everyone, there is a question I have and I hope somebody here can help me out.
Does the wavelength of a laser diode depend on the current it is driven or on the temperature it heats up during high currents? If it would depend mostly on a high current it would be pretty neat, because I would really like to have a 470nm laser but DPSS are quite expensive. So I could just pulse it with high power pulses to get the shift in wavelength but don't have to struggle with extreme high power CW output. (well, for me everything higher than 100mW is already high power).

Greetings, MrMcChicken :yh:

Some rare lab lasers for sale!

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It's been along time since I've posted anything here for sale but I'm in need of money! I have a few extra finds that I'd like to share, and while I know that they're extremely expensive I'm willing to work with people to sell these fairly fast in order to pay for some important stuff, like instrument and car repairs, as well as to bring more cool stuff to LPF. I promise it'll be worth it! I know I've been incredibly quiet lately, as work has been busy, and my sister is getting married in a bunch of other things, so I'm just a mess ATM. I know most people here don't have this kind of money, but thought I'd offer anyway. let's get started!

At the time of writing this I'm doing it on my phone, pictures will not be posted immediately.

Melles Griot YCA-10 561nm SLM ~5mW - $1200

Salvage from an old machine and saved it from the trash. I pampered it a bit now it locks at 5 mW. Well actually go a bit higher but I purposely lowered it in order to help it to survive longer. I'm not 100% sure what went wrong with this laser and I think that's just the diode started to get weak prematurely. It is definitely not an alignment issue.

I also have a for parts head missing only the tecs. Not sure that I'll get rid of it but you can make an offer.

I also have an OEM Spectra-Physics Cyan laser 488-20 with a brand new driver. At about 2700 hours, which is nothing for these. Locks ~22mW SLM - $2000

I also have a home made Melles Griot 675nm laser I'm selling, stable at 20mW iirc in a 501 host. Would be great for calibrating LPMs and other such things, as well as a bit of a collectible. - $100

I also have an assortment of small helium neon lasers and other stuff, but I have to go through all of it first.

How to judge whether it is a good laser pointer company?

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I heard from someone not long ago that is " If you want to judge whether a store is reliable or not , just google it, the former the rank, the more reliable it is."
So, when I wanna know which laser pointer company is the best,I searched the keywords "laser pointer", the results were as follows:

Quote:

No.1 laser pointerpro laser pointer
No.2 wickpedia of laser pointer
No.3 wicked lasers laser pointer
No.4 HTPOW laser pointer
No.5 eBay
Does it mean the best company is lsaerpointerpro? How about the other?

Gold plated Jetbeam Tea30 mini mod!

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This limited edition Titanium gold plated edc is tiny, I did a nice duel Flexdrive mod on his brother and had no plans on modding this one until today,

I had a Spare A140 in my box of goodies so pulled the Cree XPG 131 lumen led out and knowing there just isn't enough room to even use a Flexdrive I decided to just use the double board original driver, not something I do often!

Anyhow got them in and now I have a 2 mode executive mini laser to add to my personal collection.


https://youtu.be/vP9BqXAYKRk

https://youtu.be/d5lNxQ5C9oI

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Jetlasers

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Has anyone here had any experience purchasing from jetlasers. I sent gray an email originally asking when it would be shipped and he said sometime early next week its now tuesday and i haven't had a reply or update for 4 days. How long did it take for your jetlasers to arrive?

Hey, post some pictures of how powerful your laser is

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I´d like to see how powerful lasers actually get :)
So i would be happy if you could post a pic or 2 of your laser :):D:thanks:

Ordered 3 Assassin V2 lasers. Am I an idiot?

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On a whim, I ordered a (supposedly) 200mW version each of a 405, 532 and 650nm laser from assassinlasers.com in a combo pack for $110. Before I ordered, I asked their customer service several questions via email (including the actual power of each). They seemed to respond quickly, though they didn't really answer my specific questions until pressed. After I finally got the answers I thought I needed, I ordered.
I have now spent the last week trying to get them to answer very specific questions about the Li-ion batteries that I need to use (I have never owned anything that used them), only to get vague seemingly scripted and sometimes contradictory responses, when I actually get one at all! They seem to be sending UltraFire 18650 3000mAh 3.7v batteries, but are only telling me to use the ones they provide (2500-3000mAh) and otherwise, won't even say the brand or whether they are protected or not. This makes me wonder if I should have ordered from them in the first place.
Does anyone know if this company provides a reliable product? (I linked there from this site.)
I also would like to know about the best batteries and multiple chargers for them. They will send me one battery and a single charger for each laser, which means I'll have to find three open outlets in my house to charge all three at once, and I'll have to charge them for 8 hours before I can even use them when I finally get the lasers!:banghead:
How much does the capacity matter (above or below 3000mAh), as far as being dangerous to the circuitry.
Does the protected status matter other than while charging?
Sorry I've been rambling, but they have not responded to me in days and I'm worried I might have made a mistake.
Any advice/opinions would be appreciated.
Thank you.:thanks:

Anyone know this moron?

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The link at the bottom has video.


A 30-year-old Sykesville man was arrested and charged with shining a laser pointer at a Maryland State Police helicopter early Monday morning.
Advertisement

Connor Grant Brown is charged with reckless endangerment, obstructing and hindering and shining a laser pointer at an aircraft, state police said. Additional charges may be added, police said.

State police said they were providing aviation support to the Carroll County’s Sheriff’s Office at 1:05 a.m. in the area of the 800 block of Klees Mill Road in Westminster. The cockpit of the aircraft was hit by a green laser beam approximately eight times, they said.

State police said the crew was forced to abort its mission in an attempt to locate the source of the laser beam. From a pilot's perspective, a beam of light like the laser can have devastating consequences, officials said.

"They were literally attacked by laser beams coming from a different area in Carroll County," MSP spokeswoman Elena Russo said.

The origin of the laser came was determined to be a home in the 1200 block of Canterbury Drive, police said. Investigators said Brown, who lives at that address, operated the laser device that struck the helicopter. The laser device was recovered and Brown was arrested.

WBAL-TV 11 News tried to talk to Brown about the incident, but no one responded at his home.

"This is a very serious incident for people working inside an aircraft to be hit with a laser beams. These high-powered beams can cause temporary blindness. They can cause damage to somebody's retina, so not only does it cause problems for people on board the aircraft, but it could also be catastrophic for anybody on the ground, should they lose control of the aircraft," Russo said.

The FBI and the Federal Aviation Administration have been notified of the incident. Directing light from a laser pointer at an aircraft can also be prosecuted as a federal crime.

The pilot and the crew chief of the helicopter, both of the Maryland State Police Aviation Command, suffered eye injuries in the incident. They were taken to Frederick Memorial Hospital for treatment and were later released, police said.

The helicopter had four people on board. The light affected two of them.

"A pilot and trooper paramedic on board were both affected by these laser beams. They were transported to Frederick Memorial Hospital, where they are undergoing some medical treatment, and I know there is some follow-up going on with an ophthalmologist," Russo said.

Brown was released on his own recognizance. He is scheduled to be in court on March 24.
Sykesville man charged with shining laser pointer at MSP helicopter

Drill bit guide for 12mm heatsink

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I am just trying to find a drill bit that would make a decent fit for a 12mm dia copper module.

I have found 31/64 ( actually 0.4844") as being the closest drill bit to 12mm
12mm translates into 0.472"

What are you using to machine heatsinks? :thinking:

This question is aimed directly at metalworkers!

:can:
Thanks

NZONIC BDR-209 Build

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My first build post, woohoo! :D I wanted to put together a 405nm 510 thread build, so of course I started at DTR's Laser Shop:

Parts List:
- Diode: BDR-209 16X $68
- Driver: NanoDrive
- Lens: G2
- Host: NZONIC Mech Mod $10
- Battery: Samsung 25R 18650 $16/2
- Heatsink: 22mm DTR heatsink $12
510 Adapter: 3D RDA $5

Host:


It's quite heavy and feels really well built. There is room enough for one 18650, or two 18350s. The button is a rear-firing magnetic momentary switch with a spin lock. And I liked how the etched lines match DTR's heatsink.

Laser Module:


This is the first time ordering from DTR, but I'm sure it won't be the last! Very nice work on all of the pieces. The assembled driver module fit almost perfectly with the heatsink, but I found I needed to loosen the lower shielding about 1/4 turn to have the two pieces align enough to slide in.

I'm assuming this is one of those fixed to 520mA, which should result in a beam power of ~860mW.

Heatsink:


Adapter:


Harvested off of this 3D rebuildable atomizer.



It took one good whack with a rubber mallet to knock out the center pin of the adapter.



The old "pinch the wire" trick wasn't working for me, as the spring-loaded pin was causing the wire to make contact with the outside wall, causing a short. So I resorted to soldering it on. Immediately after taking this picture I realized I forgot to thread the wire through the adapter before soldering the pin on, so I had to de-solder it and do it again. :P And unfortunately, the adapter's threading was a little bigger in diameter than the heatsink's threading, but a few turns of Teflon tape fixed that. :)



The finished laser module and accompanying mech mod.



The assembled laser.



The focused beam burns very quickly and looks great!

Well, that's it. Thanks for reading, I hope you enjoyed!
:beer:

Toasted diode on laser.

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Hi! :whistle:
I bought a cheap laser off ebay

Neu Grün Lila Rot Laser Pointer Stift Strahl Stern Zeiger Pen Beam Präsentation

And a day after i recieved it i went outside.
It was foggy and the ground was wet but it didnt rain and i pointed it at different high things and at the sky. And suddenly the laser couldnt turn on and i clicked some times and it turned on again and then it stopped working.

I didnt have it on for more than 30 secs a time but i used it alot in a short period of time.

So i try to dry the laser because it could have been the fog but it still doesnt work.

So i bought a new laser from ebay.com from another seller is there anything i have to be careful with so it doesnt break again? :)


The laser said 5mw on the warning label but it was clearny not 5mw because i could see the beam when the sun began to go down :)


-Fojumdk

07E Laser Box Build

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07E Laser Box Build
______________________________________

I wanted to try something a bit different than what I've seen and done for laser hosts, so I went browsing for project boxes and found a really nice alu extrusion box and picked it up. I was planning on originally making this just a lab style laser mounted to a heatsink, but I had a better idea. Portable "laser box". The most difficult thing about this build is the fact that it was all one piece, so I'd have to shove my fingers in the box if I needed to get at something, otherwise all the wiring was done through the mounting holes.

Also, this post counts as my 1000th post, making me an LPF vet! ...Right? :p


This is the best fitting piece I could find, for the heatsink. This is before cut to size.


Here's the heatsink cut to size, just with a bandsaw. Notice the Sanwu BE as I was tasting for how much clearance I could get for the adapter inside of the box without hitting the button. Turns out the adapter had to stay outside of the box for the most part.


A look at some of the wiring, definitely an annoying part to this build because of the lack of access. You can see in this shot I'm testing different parts of the circuit. You might also realize that I had the holes drilled and the switch in place.


My solution for the contact board was this piece of wood, a couple of bolts/nuts/washers with just the tension holding the springs in place. This turned out a lot nicer than I though.


This is the battery bay I designed on Sketchup, I ended up 3d printing it because the tolerances were way to tight to create with tools. At a couple points the walls were smaller than a mm. This takes 2*18350 batteries.

Final shots





You might notice that there are black spacers between the project box and the center button, this is because the depth of the button is too big for the actual box.

I'll be adding more shots later but that's all for now. :beer:

-Sean (E.P.)

Larry DFW's 18650s

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I got 2 of Larry's [Larry DFW here on LPF] 18650 Sanyo's and thought I should check them after 2 years of use in lasers and vape rigs. When I got them they had 40mohms of internal resistance I just checked them and they are both at 70mohms.
All I can say is if you don't mind 11.95 per battery than go with them.
Here is a link to his web page 18650 Batteries & Chargers
Ed :beer:

PSA: Cool down your DPSS lasers and check for extra lines!

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Hello folks!

In the past few months, myself and a few other users discovered some strange properties of DPSS lasers, particularly 589nm and 532nm units.

When cooled down, certain DPSS lasers display anomalous behavior, including multiline activity and main-line shifting.
This is believed to be caused by defective mirror coatings.

It is possible that there was a 'bad batch' of DL Spartan 589s created recently. I have one of them... and by 'bad batch', I mean 'awesome because they emit 583.8nm when cold.'
So if you purchased a DL Spartan 589 recently, please try cooling it down on an AC vent, in a freezer (BRIEFLY), or outside in the cold.
Then check using a diffraction grating for any extra colors or color changes!

You can do this same procedure with a 532, or any other DPSS wavelength!



:)

Laser image shape/cross section

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Hi everyone! New here and new to lasers but I have been reading the site over the past week or so trying to educate myself.

My question is about the shape of the laser on the cast on the wall. If the beam is collimated it's going to be a small circle on the wall and using lensing I could defocus that beam to be a larger circle on the wall at the same distance.

Is it possible to create other shapes without losing any energy density? To me the obvious solution would be to block out the parts of the circle that don't fit the desired shape but is it possible to focus the beam into say a star or a square without losing any of that energy density?

radioactive material and laser ionization threshold

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Lets imagine this,you have pulse laser with focus lense that you use to turn air or noble gases in hermeticaly sealed chamber into plasma.To ionise air with laser,the laser beam must reach certain power,it must get past the threshold required.

Now,if we place a radioactive material,lets say Uranium 238/Thorium232/Radium cube with 1cm width 1 centimeter away from the focal point of laser beam where the plasma is created,it will cause alpha,beta and x-ray/gamma radiation in the area of focal point.

My question is this,does any of the three types of radiation mentioned present in the focal point affect the minimum ionisation energy level? Will radiation allow me to lower the power of the pulse laser and still ionise air? Lets say I need minimum of 1 microjoule to cause ionization without the radioactive material cube present,will the presence of the radiation from cube allow me to lower the power to lets say 0.9 microjoule and still get plasma?

I would like to broaden this question into three sub questions,its becose the photoionisation can happen in three ways: 1. when the laser have high enough freqency,only single photon is needed ( becose higher freqency photons have higher energy ) 2. multiphoton 3. tunnel ionisation.

For example,can it be that gamma radiation present in the focal point area lowers the multiphoton energy needed but does nothing for tunnel ionisation? Or,electron ( beta radiation ) lowers ionization threshold,but not proton,remember,beta riadiation are free electrons and protons that leave radioactive atom.

PSA: Cool down your 589s and check for extra lines!

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Hello folks!

In the past few months, myself and a few other users discovered some strange properties of DPSS lasers, particularly 589nm and 532nm units.

When cooled down, certain DPSS lasers display anomalous behavior, including multiline activity and main-line shifting.
This is believed to be caused by defective mirror coatings.

It is possible that there was a 'bad batch' of DL Spartan 589s created recently. I have one of them... and by 'bad batch', I mean 'awesome because they emit 583.8nm when cold.'
So if you purchased a DL Spartan 589 recently, please try cooling it down on an AC vent, in a freezer (BRIEFLY), or outside in the cold.
Then check using a diffraction grating for any extra colors or color changes!

You can do this same procedure with a 532, or any other DPSS wavelength!



:)

NDB7875/ Funky Camo

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hi,
Like to share another build with a custom Aluminum sink and focus adapter.
Inside is;
1) NDB7475/9MM diode DTR..
2)SXD 2.4A sinked to the main sink..
3) G2 Lens
4) 2-18350 cells
This one is a real performer nice diode out put. Efficient plus..
Hope you all enjoy it..

Rich:)

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NUBM05/4A SXD/G Ball Sold!!

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Hi Folks for sale is a NUBM05 with a SXD diver set to 4A , G Ball Lens
Custom full copper sink and knob , Driver sinked to the main sink also . And an added battery tube extension for 2=18650's.added lanyard loop..
Asking $180.00 shipped 2-day priority mail..
Thank You
Rich:)

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Laser burning - what's my problem?

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Hi,
As there's no newbies forum, I'll just dive in here. Sorry if it's all a bit basic - it's not for lack of googling!

1: I want to burn... YouTube is full of people making smoke, engraving black plastic etc, as if it's no problem. I'm experimenting with an LPC836 with an Aixiz (?) coated lens... NOTHING! Focussing isn't easy, but I turn the driver down for that, then up again. I'm using a lens-->paper distance of about 6" (15cm), hoping that the focussing's not quite so delicate?, but still nothing.

2: I HAVE managed to make a tiny mark on some thermal paper using a dvd burner diode in its sled, trying to hold the paper a couple of mm from the lens, but focussing is VERY delicate.
(2a: Has anyone had any luck using the auto-focus mechanism of a sled?)

3: I've deduced that the meaning of "LED" is "became an ex-diode", but what does it stand for? : - )
Thanks for any help!
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