Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers

Buy Site Supporter Role (remove some ads) | LPF Donations

Links below open in new window

FrozenGate by Avery

565nm From LaserLandAustralia

Are these pump diodes case positive? That is going to make a difference if someone wants to put the module in a handheld. I'm hoping to measure the pump with my USB2000+ spectrometer. It cuts off aroung 850nm, though. So, if the pump is higher in wavelength my only other option is to align one of the B&W TEK spectrometers to 850nm-1150nm. That could take some time to accomplish.
 
Last edited:





That's known as a wavelength hop, not a sweep.

Ours had a 5 nm slow sweep (linear change no winking) caused by index of refraction changes as the material heated up.

There are some materials that self double.... for example NYAB.

If I had to guess, this is going to possibly be pumped by a distributed Bragg reflector diode to get it on the right pump frequency.

Steve
 
Do DBR diodes get up to 1100 mA of current draw? I know they can be tuned by current of temperature within a fairly narrow band, like 2nm.
 
My 575nm should arrive tomorrow. He was a bit slack posting it. Said he posted it last Friday. Tracking shows number created friday but it was not posted till Monday.

My Money is still on a Cheap 532 KTP directly pumped with an 1130-1150nm IR Diode.
 
Last edited:
Mosc007 said:
My 575nm should arrive tomorrow. He was a bit slack posting it. Said he posted it last Friday. Tracking shows number created friday but it was not posted Monday.

My Money is still on a Cheap 532 KTP directly pumped with an 1130-1150nm IR Diode.
Click to expand...

Hi yes it was posted on Friday but missed the pic up at the post office thus being left in the drop off parcel locker and collected on Monday
 
Lazer2107 said:
Hi yes it was posted on Friday but missed the pic up at the post office thus being left in the drop off parcel locker and collected on Monday
Click to expand...

Ok. My LPO has a Cut off time around 4pm even though they are open till 5pm.
 
Maybe you'll get it at the same time I get mine. Still tracking as delivered tomorrow. You got to love DHL if you are waiting for something from China. I can get things in 4 days instead of the normal 15 to 20 days. I always get new diodes either by DHL or FedEx. DHL is faster though.
 
Pump diode may be 980nm. Here’s a crystal glowing at 980nm. BTW, it’s only 100mw 980, so idk. My guesses it’s 980 cause it’s cheap like 808nm diodes.

q0LTPr.jpg


Edit: pump wl is not going through my EP 600-1100nm, fully blocking it.
 
Last edited:
I think 980 is just high enough to excite KTP but maybe not lase. If it does lase you should get 490nm from it. Does that sound familiar from what was found on eBay recently ?... If it is just frequency doubling it will need to be 1130-1150nm to get 565-575nm. It might be a new IR diode wavelength that has made this possible.

Another possible wavelength is 1695-1725nm but I doubt that's it. Apparently KTP can work at the 3rd harmonic. IE. Frequency trippling.
 
Last edited:
The question that's obviously needs an answer is this: from a series of posted photos in one of the two threads shows the construction of this laser to be just slightly more complicated than a 670nm red laser, why did it take till 2018 for these to be available?
 
steve001 said:
The question that's obviously needs an answer is this: from a series of posted photos in one of the two threads shows the construction of this laser to be just slightly more complicated than a 670nm red laser, why did it take till 2018 for these to be available?
Click to expand...

I suspect it was only recently an IR diode with a wavelength of 1130-1150nm was developed. Without that it's not possible to get 565-575nm using a frequency doubling crystal.

And as seen on Ebay very recently it looks like they also have 488nm in these cheap modules. Although it might actualy be 490nm which is generated from a 980nm IR Diode and frequency doubled.
 
Last edited:
I agree with Mosc007. It may be the diodes that held this laser back not the process. It interests me as we've seen a diode boom over the last few years, but dpss has stayed pretty dormant. A new range of cheap ir diodes could spark new direct doubled dpss's flooding into our hobby.
 
Last edited:
I got my 575nm laser this morning and it is most definitely a laser with all the speckle around the perfectly round dot at 15 feet. I only see yellow, but haven't had a chance to measure its wavelength yet. What a gorgeous yellow laser and it only cost me $30.00 brand new! I can't wait to get back into it. :yh:
 
I know what it likely is now, will confirm when it gets here.

Self doubling, broadly tunable, rare earth material.

Pump is going to be out near 970-980 where most cheap spectrometers with silicon detectors are starting to be blind. There are other pump bands.

There are four possible host materials and it is a doped rare earth ion, with more then one dopant.

Amazing stuff..

Steve
 
You must log in or register to reply here.





Back
Top