Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





One laser store meets all your needs

Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > General





Reply
 
LinkBack Thread Tools Display Modes
Old 09-13-2016, 12:09 PM #1
CurtisOliver's Avatar
Class 3B Laser
 
Join Date: Jun 2015
Location: Brentwood, England (Near London)
Posts: 3,638
Rep Power: 93248
CurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond repute
CurtisOliver CurtisOliver is online now
Class 3B Laser
CurtisOliver's Avatar
 
Join Date: Jun 2015
Location: Brentwood, England (Near London)
Posts: 3,638
Rep Power: 93248
CurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond repute
Default Mystery crystal growth. More efficient DPSS process using KDP.

Hi everyone, I have come across an article by NIST.
It has sparked interest in me as it could allow more efficient and higher power yielding for 532nm DPSS's.
As well as the possibility of allowing more DPSS wavelengths to become a reality. They use KDP which is grown in a rather exotic way of which scientists can't explain yet. Neither can they explain why it even works efficiently.

This section of the article is good news for the future.
Quote:
The team also suggests the rods could be stacked up like firewood, building a larger piece out of billions of the tiny filaments. Before they are stacked together they could be coated by a thin layer of conductive material that carries heat away, rendering them capable of handling repeated pulses of high-intensity laser light potentially broadening their application range if a way can be found to stack them.
No more efficient but low power handling KTP. Instead high power handling, low cost and efficient KDP. We can only dream

I am going to include links to both the NIST article and the paper it references. If anyone is interested in reading into the articles, feel free to report back your thoughts.

NIST Article
Paper


__________________
Notable products/sites:

Jet Lasers offers various high quality Diode/DPSS Portables in their PL-E Pro hosts. Jet Lasers are known for their quality and are respected on LPF.
Jetlasers PLE Pro's

If you are after an RGB module, you can't go wrong with Optlasers. Their 400mW model is very high quality.
Optlasers RGB Modules

Optotronics offers some of the highest output DPSS Portable Greens on the market. Their 1.4W RPL-II is by far their most amazing product and is known to be overspec.
Optotronics RPL 532nm DPSS Portables

Dragon Lasers offers the best option for 589nm (Yellow) Laser pointers.
Dragon Lasers Yellow Laser Pointers

Sanwu are known to be very high quality and every newcomer should check them out.
Sanwu Home

Bang good is a good source for many electrical items and are often cheap and reliable.
Bang Good Home

For reliable safety goggles visit Survival Laser. Use LPF445 for a 10% member discount.
Eagle Pair Safety Goggles

For more sites and information please check out this thread.
Which company should I buy from? By Sta




Useful Links:
Wavelength to RGB Converter
CurtisOliver is online now   Reply With Quote


















Old 09-14-2016, 03:55 AM #2
diachi's Avatar
Class 4 Laser
 
Join Date: Feb 2008
Location: Yellowknife, NT, Canada
Posts: 8,434
Rep Power: 78159
diachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond repute
Send a message via Skype™ to diachi
diachi diachi is online now
Class 4 Laser
diachi's Avatar
 
Join Date: Feb 2008
Location: Yellowknife, NT, Canada
Posts: 8,434
Rep Power: 78159
diachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond repute
Send a message via Skype™ to diachi
Default Re: Mystery crystal growth. More efficient DPSS process using KDP.

Interesting - hopefully that'll trickle down to us . I don't imagine a batch of those fancy new crystals would be cheap ... or even one of those fancy new crystals.

That said ... it doesn't sound like it'd have much benefit for pointers. More useful for big Q-Switched lasers and other high peak power pulsed lasers by the sound of things.
__________________


405nm | Banggood LT-850 | "5mW" | Review Unit | Review WIP
445nm | Sanwu Laser Pocket Series | 400mW Metered
445nm | NDB7242E Pen Build | 60mW Metered | >>Build Thread<<
450nm | LaserPointerStore - Thor H2 | 1W(?) | Review Unit | >>Review<<
473nm | B&W Tek BWB-10-OEM |
488nm | Spectra Physics 163 Argon | ~30mW Metered
515nm | PL515 Pen Build | 50mW Metered | >>Build Thread<<
520nm | Laserlands 520 | 5mW | Review Unit | 3mW metered | >>Review<<
532nm | Gearbest 303 Pointer | 50mW Metered
532nm | Gearbest JD-850 Pointer | 30mW Metered (I think, need to re-test).
633nm | HeNe | 6mW
633nm | Spectra Physics 155 HeNe | <1mW >>Thread<<
650nm | Sanwu Laser Pocket Series | 200mW Metered
808nm | Melles Griot 532nm Lab Unit | No Crystals >10W | X2


B&W Tek Spectrometer
LaserBee 2.5W USB LPM


Check out my Reddit Subreddit! >>/r/laserpointers<<

diachi is online now   Reply With Quote
Old 09-14-2016, 05:17 AM #3
H2Oxide's Avatar
Class 2M Laser
 
Join Date: Dec 2014
Location: USA, OR
Posts: 977
Rep Power: 8151
H2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond repute
H2Oxide H2Oxide is online now
Class 2M Laser
H2Oxide's Avatar
 
Join Date: Dec 2014
Location: USA, OR
Posts: 977
Rep Power: 8151
H2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond reputeH2Oxide has a reputation beyond repute
Default Re: Mystery crystal growth. More efficient DPSS process using KDP.

Huh.

What's interesting is that they're using KDP, rather than the typically preferred KD*P. And, if my understanding is correct (only had time for a quick skim of the paper), these can be grown at home (KDP is water-soluble). If this pans out it could result in a huge price reduction of frequency doublers for us hobbyists.

I just finished my second batch of KDP crystals a few days ago, and since I have some temperature control stuff on the way anyway I might try growing these.
__________________


It's not denial. I'm just very selective about the reality I accept.

Last edited by H2Oxide; 09-14-2016 at 05:18 AM.
H2Oxide is online now   Reply With Quote
Old 09-14-2016, 06:29 AM #4
HydroSean's Avatar
Class 2M Laser
 
Join Date: Mar 2016
Location: Indiana
Posts: 522
Rep Power: 2631
HydroSean has a reputation beyond reputeHydroSean has a reputation beyond reputeHydroSean has a reputation beyond reputeHydroSean has a reputation beyond reputeHydroSean has a reputation beyond reputeHydroSean has a reputation beyond reputeHydroSean has a reputation beyond reputeHydroSean has a reputation beyond reputeHydroSean has a reputation beyond reputeHydroSean has a reputation beyond reputeHydroSean has a reputation beyond repute
HydroSean HydroSean is offline
Class 2M Laser
HydroSean's Avatar
 
Join Date: Mar 2016
Location: Indiana
Posts: 522
Rep Power: 2631
HydroSean has a reputation beyond reputeHydroSean has a reputation beyond reputeHydroSean has a reputation beyond reputeHydroSean has a reputation beyond reputeHydroSean has a reputation beyond reputeHydroSean has a reputation beyond reputeHydroSean has a reputation beyond reputeHydroSean has a reputation beyond reputeHydroSean has a reputation beyond reputeHydroSean has a reputation beyond reputeHydroSean has a reputation beyond repute
Default Re: Mystery crystal growth. More efficient DPSS process using KDP.

This reminds me of how no one can explain why the second derivative of the critical micelle concentration of amphiphiles with respect to temperature is positive. In other words the critical micelle concentration decreases with temperature as it is predicted to, but at a certain low temperature it suddenly starts to increase and no one knows why. I remember my professor saying that a lot of "hand-waving" goes on at this point, where they just agree to disagree on the exact mechanism. I think this applies to the KDP initial crystal growth but I can propose my own theory. It is known that the only reason crystals grow in a saturated solution is because the formation is favorable by decreasing the amount of Gibb's free energy. The mechanism for simplistic crystals forming out of super saturated solutions starts with either a seed crystal or a nucleation event. Given that these are highly pure and controlled experiments I am going to assume that they do not use a seed crystal, this means that the nucleation event must be the kinetic product of two KDP molecules colliding as the super saturated solution cools down. From this kinetic product, although disfavorable to the thermodynamic product, it is necessary to create this nucleation event. I hypothesize that the kinetic product causes the formation of these hexagonal rods. I would need to see the ball-and-stick model as well as the space filling diagram of the KDP rods to further hypothesize the crystal formation mechanism. Although the mechanism eludes us, the data is still there so we can just "hand-wave" for the time being and focus on the development and use of this technology. As far as growing them in large arrays with uniform cross-sections goes, I know in the past scientists have employed rods on the growing medium to facilitate a less amorphous product crystal like the one in this article. https://www.researchgate.net/publica...t_Mater_182010
Perhaps they can use something like that to achieve a more uniform crystalline product.

Good article though and great read

Last edited by HydroSean; 09-14-2016 at 06:32 AM.
HydroSean is offline   Reply With Quote
Reply

Tags
532nm dpss, crystals, dpss, efficiency, mystery





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On











Loading
















Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 10:35 AM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC