Yellow DPSS Laser for under $100?! Unboxing, Review & Measurement with a Raspberry Pi Spectrometer

[@andymouse]

Great vid, I've never used Alibaba just Aliexpress didn't even know the difference so gonna check that out, shame the colour dosent come across on camera, I hope the seller see's this, as he's got a glowing report and maybe cut you a deal on future purchases, would love to see a vid on reverse engineering that PSU (or a schematic!) awesome work!...cheers.

[@suhailab3634]

I have a few of these lasence modules I have 1 575nm Module, a 561nm module, a 558nm module a 555nm module and 3 545nm modules.xthey are very nice modules!

[@LesLaboratory]

Cool! I might have to go shopping over the next few months, if budget permits!

[@suhailab3634]

@@LesLaboratory one tip, dont open up your 575nm lasence modules because the crystals are hydroscopic it will get damaged in 3 days when opened. I learnt that the hard way!

[@Zenodilodon]

Hey Les, I have pictures of the inside of those modules if you want (older revision ). Also I currently a few crystals from the older ones from years ago that I have been pumping with 976nm. They are either YB:COB or YB:SVAP from what I know. Just a few things, anyone who buys one I strongly suggest turn down the power the pumps like to cook also the crystals are very sensitive so keep it sealed. I am in the middle of collecting information on them and that should be out sometime this summer for everyone. Great video It's nice to see them back!

[@LesLaboratory]

Awesome! Thanks for the info! Time to go digging on the Literature. Interesting stuff for sure. Yes, I read these were out for a while a few years ago, at an even lower price, but disappeared... Definitely very cool though!

[@Zenodilodon]

@@LesLaboratory Yeah they where $35 ish. You should have information on the laser crystals from the information I sent to you.

[@LesLaboratory]

Wish I had been in on that action, I would have bought a few. There was another seller on Alibaba advertising at $40, but they have no stock.

[@suhailab3634]

@@LesLaboratory that other seller is optlaser, they do have stock as I'm currently buying from them, but they don't have high power modules and they only sell to some customers.

[@osmanfb1]

smoke shot is not gratuitous! needed. Great video. Thanks.

[@LesLaboratory]

Couldn't resist :-D

[@chuckvanderbildt]

Nice find! Alibaba can be a bit of a pain, hope these show up on Aliexpress soon. So if the manufacturer is reading this... :P

[@LesLaboratory]

Yeah, I hope so too. It's not that bad on Alibaba once you get used to it, but their search engine sucks!

[@das250250]

Can you discuss the practical application for the yellow over say red ? Obviously yellow having more energy than red but less than violet wavelengths

[@LesLaboratory]

Sure, you can use them to probe fluorescent Dyes. Some dyes have particularly narrow absorption ranges. In addition you can create dyes that will bond to particular molecules or surfaces (called markers in industry). So you can dye a biological specimen, like a cell for example, and illuminate it with different wavelengths to pick out and highlight the different features. Those beautiful pictures you see occasionally that look like false color images of cells, were probably taken this way.

[@Gianns_TDM]

I have been following lasance and their progress during the last year and I can say that you shouldn't worry about long term life too much, they do a bunch of QA before units are sent off. I'll get a 575 too, nice wavelength with interesting properties in terms of it's interaction with proteins. Drivers of theirs look not the best but far better than typical chiniseum. btw the 20mw 559 version of that module uses a linear driver not SMPS like yours

[@LesLaboratory]

Cool, that's good news! I would really like to know how they manage it at that price point!

[@Gianns_TDM]

@@LesLaboratory From what I have gathered: Those are in fact direct doubled media. Lasance grows 1 huge crystal a month and then they cut into very small pieces comparable in dimensions to the KTP/YAG assembly in 303 eBay pointers. If I remember correctly they also use the same mounts used in said 303 pointers for the crystals. Haven't found any source on what the crystals actually are but it's commonly speculated that they are ND:SVAP or similar.

[@suhailab3634]

@@Gianns_TDM the crystals are self frequency doubling like the OPTlaser modules 3 years ago. Also in some 575nm lasence modules a small green side emmision of 515nm can be observed.

[@christopherleubner6633]

Make a little TEC controller for it, would stabilize the output. It appears to be an assembly for a lab type laser as it does not appear to have good collimation. Wonder if it is a deep cavity direct doubled VCSEL diode or a a DPSS. 🤔

[@LesLaboratory]

It would be interesting to do it an characterize it. I heard DPSS, but without a teardown, its just a rumour!

[@aps8446]

Let's hope for a long lifespan of that lemon photon awesomeness

[@gammaleader96]

Nice, I like the new optical setup. Your yellow laser videos always make me feel broken, since it still looks pretty green to my eyes. Some off topic questiion, where does the CRT come from that is on top of your oscilloscopes? Is it from some kind of test equipment? Greetings, Michael

[@LesLaboratory]

Thanks! Because it is pure yellow (not a mix of red and green), only the Green pixels really see it. Videoing lasers is a pain in the ass. Violet also looks purple on camera. It's not a color that any monitor can faithfully reproduce. The monitor came from eBay (ex hospital stuff). It's a green screen as well ;-) I also have a Phillips monitor that I replaced the CRT in with an ex-radar, Amber long persistence phosphor which looks really cool! I will do a series on CRT's at some point. Cheers! Les

[@epicsnowleapard]

​@@LesLaboratoryTwo years late but you can always add a filter to the video in the post processing to bring out more true colors of your lasers, cheers.

[@TerryLawrence001]

Yes! Awesome!

[@w0003947]

Hey, i got a 589nm laser which appears golden, but this is special lime green...i used to think 520nm was lime green, this is better. Missed those laser setup you have there, used to have one myself, but ever since moving up the game, tend to lost track a little. Keep up the interesting vids. Cheers buddy.

[@LesLaboratory]

Cool, yes they are a weird color for sure! Cheers!

[@SodiumSyndicate]

520nm is forest green. Lime green is 555nm, which this laser is.

[@r100curtaincall]

Very nice for the price. Being someone who has a 577 genesis laser, i deal with watts of this wavelength roughly, and it is indeed a striking yellow color as you approach 580nm or so. Hopefully the orange spectrum I’ll have a reasonably cheap solution in the future as well.

[@LesLaboratory]

I would love to see Orange. I have a yellow He-Ne @ 594nm that looks amber, almost orange to me.

[@r100curtaincall]

@@LesLaboratory Yes, it's not quite orange, not quite yellow. It's kind of a traffic light yellow, or slightly amber colored depending on the lighting your eyes have around for reference. looking at lasers in the dark vs in a well lit room can actually affect the way some people see them, due to the way our brains process information. I would offer to send you an orange for a video, but they are unfortunately exceptionally hard to come across nowadays, and there are no guarantees as to how the post will treat it in transit. 611.8nm is kind of a firey traffic cone red-orange color. If you wanted to obtain orange though, I could help you to obtain a rare, brewster terminated HeNe tube however, and you could use that to lase orange with appropriate mirrors, or create a multiline tube of your own out of it. I believe I have a few sitting around.

[@bitonic589]

@@LesLaboratory Technically I could build a 5390mW (5.3 watt) yellow laser, but I would only be able to choose the beam or the dot to be correctly yellow. I could either have a yellow beam and a weird lime dot, or a weird lime beam and a yellow dot. Hmm. Yellow is very cool.

[@artistlaser1675]

The colors of 571 nm(574 nm) and 577 nm are noticeably different. (571 nm/ Lemon yellow),(577 nm/ Pure yellow)

[@chanheosican6636]

Cool. I get my lasers mainly from ebay but u must be careful.

[@TinLethax]

Really wane one of these in my collection 😮

[@flirkami]

Damn, I just found your channel and I'm binging the great content. The prospect of a somewhat affordable yellow laser would be awesome. For me however, the price for the module on alibaba is above 400€ for a single one by now. Did the seller adjust the prices that much? :(

[@LesLaboratory]

Thanks! Wow! That's insane, just looked them up there, and sure enough $400, unless you want a hundred of them! Maybe drop them an e-mail, and see if they have any that didn't pass QC and see if they will cut you a deal.

[@FargothPL]

Does anyone know if it is still possible to buy 574-575nm modules from them? On their site, I only see 561nm for ~ $100

[@LesLaboratory]

Contact them and see what they either have or can do. Alibaba is an odd place where you negotiate with the seller first.

[@paultan4911]

I see they have popped up on eBay as well now

[@LesLaboratory]

Ha! Awesome!

[@suhailab3634]

Where, please send me a link

[@Not_Sure_2505]

589 has to be my favorite yellow.. dont have one, but have a 593.5 on the way

[@LesLaboratory]

Nice!

[@Not_Sure_2505]

@@Theodore_von_Schwarzenhoffen i did, just got it in. Its a very calming color, one I've been looking to get for a while. Id like a 589 at some point, and hopefully something in the 583 range.

[@Not_Sure_2505]

@@Theodore_von_Schwarzenhoffen no clue, it doesnt come with any paperwork but if i had to guess on just the 593.5 nm out put (not considered IR), id have to guess anywhere from 6 to 12 mw when its fully warmed up. I will mention it will lase at 532nm for a quarter of a second until it warms up, then its pure amber. If you run it for more than 45 secs or if it heats up too much, it will go back to lasing at 532 nm. The crystals are delicate and very sensitive to temperature.

[@Not_Sure_2505]

@@Theodore_von_Schwarzenhoffen nice, reply back here when it comes, id be interested to hear what yours is outputting. I did have to adjust the lens a little to get the focal length to infinity, out of the box it was dispersed more than i liked at 10'.

[@thewokal5641]

saw this on lp, this is the real deal then :D

[@LesLaboratory]

Yep! I'm really pleased with it. Spread the word!

[@artistlaser1675]

And the max output of 571nm Laser is 70mw.

[@willychen1370]

i wonder if it just only a blue ld pumped white led.and filter blue color.

[@LesLaboratory]

Nope, it is the real deal. One thing you cannot see very well on camera is laser speckle. You can not get that off of any other light source.

[@thorjohnson5237]

@@LesLaboratory In person, I see a lot of speckle, but on videos it doesn't show up very much... can you tell me why that is (optics noob)...

[@LesLaboratory]

@@thorjohnson5237 speclke is caused by interference. In real life this occurs at the retina itself (you can diagnose myopia with it) cameras see it, but in some circumstances is less pronounced, probably because of resolution and saturation.

[@TheChemicalWorkshop]

I wonder if it's possible to just buy the diode/module...

[@suhailab3634]

This is not a diode module, this is a DPSS laser. It uses a 976nm laser diode to pump a crystal that gets frequency doubled to 575nm

[@TheChemicalWorkshop]

@@suhailab3634 well, im pretty sure it can be sold is smaller packsge with just the diode and crystal.. like green laser

[@suhailab3634]

@@TheChemicalWorkshop theese lasers need a powerful and large 2w infrared pump diode, there also has to be a lens between the pump and the crystal. alot of the rest of the material is just extra heatsinking to cool down the c-mount pump

[@TheChemicalWorkshop]

@@suhailab3634 hm... well then gotta wait 5 years

[@suhailab3634]

@@TheChemicalWorkshop you can make smaller yellow green lasers but not 575nm as 575nm is very inefficient. I've made a small 565nm module and lasence has made small 561nm modules.

[@marvintpandroid2213]

Hello, Mike sent me.

[@LesLaboratory]

Cool! Enjoy the content! :-D There are plenty of other videos too!

[@McTroyd]

I didn't even know a yellow laser was possible without using dye! Wow. Qingdao Lasence seems to have lots of cool toys. Maybe the next paycheck... 😁

[@bitonic589]

how the heck would you change a laserbeam color with dye? what the heck

[@McTroyd]

@@bitonic589 Have a look around Les' channel. He has videos about dye lasers.

[@cap2235]

A video with 0 DISLIKES??!!

[@LesLaboratory]

Weird right? There are couple in channel like that. It's either really good, or something else is going on. Bear in mind that youtube is disabling dislikes: kzbin.info/www/bejne/gKeyn6l6f8d-qcU Give it a dislike if you want and see if it works!

[@Cannotoad1201]

It looks more like a uranium green 24/32024 Sunday 2:11PM

[@parviz3998]

Where did you buy this one?

[@LesLaboratory]

It was from: lasence.en.alibaba.com/

[@davegeorge7094]

Why do state of the art video cameras make yellow look green?

[@LesLaboratory]

Because it is pure yellow (not a mix of red and green), only the Green pixels really see it. Videoing lasers is a pain in the ass. Violet also looks purple on camera. It's not a color that any monitor can faithfully reproduce

[@Zenodilodon]

It's the balance of and color depth of the filters on the sensor of the camera. Our cones pick up a pretty wide band compared to a CCD/CMOS which is a bit more narrow and a bit more into the red range of the spectrum in peak visibility. This makes the camera see a larger % of green component than red. We see peaks of red in the 635nm range while a sensor is tuned for 650nm. Our peak green is 555nm while a sensor is closer to 525nm range. It's something I am trying to figure out a correction for because I'll have to face the same problem. My only thought is to use a red filter on the camera during portions to try to knock down the green value the camera sees.

[@LesLaboratory]

@@Zenodilodon Absolutely! It would be nice to see a camera with the response curves of the eye. Of course, then you would have to produce a monitor that faithfully reproduces that as well!

[@simoncarrington3419]

Great video, really nice yellow as you say. I went to their site to grab one myself for a projector build and there’s no sign anymore for a $100 yellow! 😮 shame as it’s very nice!

[@LesLaboratory]

It might be worth emailing them for an engineering sample. the problem is with these that the applications are limited, so nobody has an excuse to mass produce them yet.

[@SodiumSyndicate]

This is 555nm lime green laser, not yellow laser

[@LesLaboratory]

It is measured in the video as 572nm yellow, as opposed to the 561nm lime green Melles-Griot.

[@vasyalapuh2878]

I see only green laser!

[@LesLaboratory]

Cameras are not good at color reproduction. The human eye sees it as yellow, as does the spectrometer.

[@tiagotiagot]

Looks green on the video though...

[@LesLaboratory]

See previous comments: Because it is pure yellow (not a mix of red and green), only the Green pixels really see it. Videoing lasers is a pain in the ass. Violet also looks purple on camera. It's not a color that any monitor can faithfully reproduce.

[@tiagotiagot]

@@LesLaboratory Ah, I hadn't realized the response curves of cameras diverged that extremely from the human eye's

[@chanheosican6636]

Free shipping but sometimes cheaper quality. Beware.

[@Laserguy2009]

They are now $800 !!!! Ouch, no thank you.

[@LesLaboratory]

Thery are still listed at $200 USD here : www.alibaba.com/product-detail/Lasence-stage-light-laser-module-yellow_1600115282670.html?spm=a2700.shop_plgr.41413.29.42edc977Pb4Alz Edit: Thats the 561nm version. In any case, drop them an email, and see if they have any "seconds"