MGL-III-532 100mW Labby(Amazing stability)

[Gabe]

Daichi, what's the output power on those bad boys? Divergence?

 

[diachi]

Nice , CNI labs do like to do over the rated power in most cases : D ,


The 1W CNI OEM 532nm I had sat at 1.7W , I also had a 100mW laser wave that sat at 150mW

Last time I metered my 500mW 532 CNI is sat right around 500mW . Need to do some work on that and bring it back up to spec. But generally speaking you're right, the CNIs do a good chunk above their rated power.

Daichi, what's the output power on those bad boys? Divergence?

They are apparently 10mW but it seems you can crank up the diode current a fair amount. From my reading several people are getting ~30mW out of them. Not sure on the divergence but I seem to recall reading somewhere that it isn't great. The one I linked to also appears to have a fibre + fibre launch with it. That'll be interesting to play around with! I'll expect anywhere from 10-25mW out of it I guess. Either way, rather good deal for 473.

got one of these a few days ago, and finally got a chance to play with it extensively today. After building a harness so I could run it with the driver halves separated so I could actually get to the pots with it running, I managed to get the stable feedback regulated output up to 24mW.

 

[Gabe]

Ah, are these the modules styropyro made a video in a while back?

 

[diachi]

Ah, are these the modules styropyro made a video in a while back?

Yes, he and a few others had these. A whole bunch of them went on sale for about the same price a while back.

 

[NightExplorer96]

Nice , CNI labs do like to do over the rated power in most cases : D ,


The 1W CNI OEM 532nm I had sat at 1.7W , I also had a 100mW laser wave that sat at 150mW

Wow, didn't even see your post ion

Thanks, and im not complaining! 76mW's above the output I requested works with me. I haven't seen a powerful 532 for awhile, and when I turned it on I was blinded for like 3 seconds lol

-Alex

 

[styropyro]

Nice new labby Alex! Not cheap but at least it runs stable and can run 100%!

Ah, are these the modules styropyro made a video in a while back?

I wish these CNI/B+W tek units would pop up more often. I still have ~20 or so of these sitting around, but most of them have no output. The optical setup in them is great for DPSS experiments, and for ~$25 a pop, you can't go wrong. Even if the crystal set is bad, you get a nice few watt 808nm pump C-mount, lenses, anamorphic prism pair, TECs, and a nice housing.

 

[NightExplorer96]

Nice new labby Alex! Not cheap but at least it runs stable and can run 100%!


I wish these CNI/B+W tek units would pop up more often. I still have ~20 or so of these sitting around, but most of them have no output. The optical setup in them is great for DPSS experiments, and for ~$25 a pop, you can't go wrong. Even if the crystal set is bad, you get a nice few watt 808nm pump C-mount, lenses, anamorphic prism pair, TECs, and a nice housing.

Thanks man!

ultimatekaiser mentioned this being like a SLM laser, isn't that good?

-Alex

 

[ultimatekaiser]

Nice , CNI labs do like to do over the rated power in most cases : D ,


The 1W CNI OEM 532nm I had sat at 1.7W , I also had a 100mW laser wave that sat at 150mW

They always should be over what they're sold as. It's the minimum specification. usually they're over by 30-50% when new. They're made to exceed what is listed.

Thanks man!

ultimatekaiser mentioned this being like a SLM laser, isn't that good?

-Alex

I said it might be single longitudinal mode....But you'd have to put it through some special tests to be sure, and those machines are $$$$...but if it is, then yes it makes it quite special. Guarenteed SLM lasers are very expensive. Anyway...enjoy the new toy! :beer:

 

[NightExplorer96]

They always should be over what they're sold as. It's the minimum specification. usually they're over by 30-50% when new. They're made to exceed what is listed.



I said it might be single longitudinal mode....But you'd have to put it through some special tests to be sure, and those machines are $$$$...but if it is, then yes it makes it quite special. Guarenteed SLM lasers are very expensive. Anyway...enjoy the new toy! :beer:

Awesome! Thanks for chimming in & posting good words Matt

-Alex

 

[Encap]

"A laser with a single well-defined frequency (corresponding to a given value of q) is a “single-longitudinal-mode laser” : only one longitudinal mode could oscillate, and the laser consequently exhibits a high spectral purity (and then an important coherence length). In a “single-transverse-mode laser”, only the TEM00q modes oscillate."
From: Optical resonators and Gaussian beams - Longitudinal and transverse modes

Yes, CNI makes/offers several models of 532nm Single Longtudinal Mode (SLM) lasers.
You can read about what they are in the real world here: Single longitudinal mode SLM laser, green and infrared single frequency laser at 532 nm and 1064 nm. the standard models offered are here: 532 nm green laser.

As ultimatekaiser said "Anyway...enjoy the new toy!"

 

[NightExplorer96]

"A laser with a single well-defined frequency (corresponding to a given value of q) is a “single-longitudinal-mode laser” : only one longitudinal mode could oscillate, and the laser consequently exhibits a high spectral purity (and then an important coherence length). In a “single-transverse-mode laser”, only the TEM00q modes oscillate."
From: Optical resonators and Gaussian beams - Longitudinal and transverse modes

Yes, CNI makes/offers several models of 532nm Single Longtudinal Mode (SLM) lasers.
You can read about what they are in the real world here: Single longitudinal mode SLM laser, green and infrared single frequency laser at 532 nm and 1064 nm. the standard models offered are here: 532 nm green laser.

As ultimatekaiser said "Anyway...enjoy the new toy!"

^I didn't understand anything in yellow hehe :yh: I appreciate the kind words Encap :beer:

-Alex

 

[ultimatekaiser]

"A laser with a single well-defined frequency (corresponding to a given value of q) is a “single-longitudinal-mode laser” : only one longitudinal mode could oscillate, and the laser consequently exhibits a high spectral purity (and then an important coherence length). In a “single-transverse-mode laser”, only the TEM00q modes oscillate."
From: Optical resonators and Gaussian beams - Longitudinal and transverse modes

Yes, CNI makes/offers several models of 532nm Single Longtudinal Mode (SLM) lasers.
You can read about what they are in the real world here: Single longitudinal mode SLM laser, green and infrared single frequency laser at 532 nm and 1064 nm. the standard models offered are here: 532 nm green laser.

As ultimatekaiser said "Anyway...enjoy the new toy!"

yes. I centers it on a single longetudenal mode on the gain curve, making it so that the frequency changes very little as the light travels, which is important for things like holography where the coherence needs to be very good as the whole principle works off interference. 'locking' it on one mode is fairly difficult in many cases, especially for diodes since they're so small. To put it in perspective, a regular 100mW green is generally about $500-700, and a guaranteed SLM 532 at 20mW, generally minimum of 2K and many really good ones that have the best beam specs and optics sold by a major manufacturer like Melles Griot can exceed $8-10K. so...yeah they're not cheapo lasers to be sure. I have a few, and they are quite stable - only varying a couple tens of uW or less. Being generous, my 56 RCS 005 varies less than a tenth of a mW at worst out of 41.3mW total (~0.0024%) though typically it is less than 30uW drift which is a whopping ~0.00048% or better over several hours...which is several orders of magnitude better than yours....but stability isn't necessarily always tied to being SLM in some cases, but it usually follows suit with it, as the power usually doesn't walk much when it is locked. Well made units don't drift much. Perhaps a holographer here can chime in.

I don't think its SLM now that I'm doing the math, but its sounds certainly getting close perhaps close enough for ameteur stuff. With an Etalon it might be able to achieve SLM for brief periods? Either way, thats impressive for a chinese laser coming from DL.

 

[NightExplorer96]

yes. I centers it on a single longetudenal mode on the gain curve, making it so that the frequency changes very little as the light travels, which is important for things like holography where the coherence needs to be very good as the whole principle works off interference. 'locking' it on one mode is fairly difficult in many cases, especially for diodes since they're so small. To put it in perspective, a regular 100mW green is generally about $500-700, and a guaranteed SLM 532 at 20mW, generally minimum of 2K and many really good ones that have the best beam specs and optics sold by a major manufacturer like Melles Griot can exceed $8-10K. so...yeah they're not cheapo lasers to be sure. I have a few, and they are quite stable - only varying a couple tens of uW or less. Being generous, my 56 RCS 005 varies less than a tenth of a mW at worst out of 41.3mW total (~0.0024%) though typically it is less than 30uW drift which is a whopping ~0.00048% or better over several hours...which is several orders of magnitude better than yours....but stability isn't necessarily always tied to being SLM in some cases, but it usually follows suit with it, as the power usually doesn't walk much when it is locked. Well made units don't drift much. Perhaps a holographer here can chime in.

I don't think its SLM now that I'm doing the math, but its sounds certainly getting close perhaps close enough for ameteur stuff. With an Etalon it might be able to achieve SLM for brief periods? Either way, thats impressive for a chinese laser coming from DL.

^Thanks for clarifying that kaiser!

I was amazed as well, %0.252 stability is amazing, especially for a DPSS laser yikes! Still a little silly all this is going to me viewing the beam but oh well

-Alex

 

[ultimatekaiser]

Well, at least the beam wont flicker! Now we just need some beam shots! op:

 

[Encap]

^I didn't understand anything in yellow.
-Alex

If you look at the link after the "yellow" it gives a detailed and mathmatical but straight forward explaination of what is meant by the term "SLM" Single Lonitudinal Mode and Transverse mode.
Here is another link that explains it better with words rather than math: https://www.rp-photonics.com/single_mode_operation.html
There is another simpler and clear explaination within this article: https://en.wikipedia.org/wiki/Mode-locking from it the following: "Although laser light is perhaps the purest form of light, it is not of a single, pure frequency or wavelength. All lasers produce light over some natural bandwidth or range of frequencies" "When more than one longitudinal mode is excited, the laser is said to be in "multi-mode" operation. When only one longitudinal mode is excited, the laser is said to be in "single-mode" operation."

I don't think its SLM now that I'm doing the math, but its sounds certainly getting close perhaps close enough for ameteur stuff. With an Etalon it might be able to achieve SLM for brief periods? Either way, thats impressive for a chinese laser coming from DL.

No it's not SLM and there is no indication on either the DL site or CNI site that it would be.
You're right it is pretty impressive for a low end/least expensive lab style laser whose actual stability specification is < 5% rms over 4 hours when you consider the $360 retail price tag.
Even with a manually controlled adjustable laboratory type LED power supply whch allows you to dial in whatever output power you want work with within the range of what the system is capable of, 0mW to max. output, only increases the retail/DL price by $200. An overspec < 100mW 532nm laser with <1% stability and an adjustable power supply for $560 is very impressive value for money spent

With annual laser sales of 60,000 lasers and total annual sales volume of $10 to $50 Million I would guess economy of scale and mass production + advances in technology and techniques of making have made it possible in 2015 to produce better quality than ever before for lower prices in than ever before. CNI is delivering good value for $ spent. see for company details: Changchun New Industries Optoelectronics Technology Co., Ltd. - UV Laser,Green Laser

 

[NightExplorer96]

So far, my last two labbies from DL have been <1% stability. Let's hope this good luck keeps up

-Alex