405g2 problem

[edison]

Hello guys

I recently purchesed 50 405g2 lenses from laser66 to collimate blue diodes. I ordered 50 at once because the first time i ordered them i was very happy with the quality.

I tried about 12 lenses from the batch and they have all the same problems. The area arround the stripe is not clean like the ones before.

I,m pretty sure laser66 switched to a new supplier but i wasn,t notified before ordering.

I wondered if anyone has the same problems with the new lenses. Does anyone has the same experience?


Here are some pictures from the lens in focus on 10 meter:

[Solarfire]

Hello guys

I recently purchesed 50 405g2 lenses from laser66 to collimate blue diodes. I ordered 50 at once because the first time i ordered them i was very happy with the quality.

I tried about 12 lenses from the batch and they have all the same problems. The area arround the stripe is not clean like the ones before.

I,m pretty sure laser66 switched to a new supplier but i wasn,t notified before ordering.

I wondered if anyone has the same problems with the new lenses. Does anyone has the same experience?


Here are some pictures from the lens in focus on 10 meter:

Have you tried a different diode?

[edison]

yes i have no improvement what so ever. I even have cleaned them with first contact to make sure that they are clean as they can be. Also no improvement.

[Solarfire]

Hmm.. dose the splash around the beam appear to rotate when adjusting focus.
Were the lens pre mounted?
Do you have the posibility to try a different lens retainer/barrel?
Are the lens and exit window of the diode(s) absolutly free from contamination?

[edison]

I use the retainer that is specially made by dave. Never had problems with those. they are spot on. I tried everything different barrel , different diodes etc. Yes the diodes are perfectly clean. I tried other lenses like o-like,s that are also brand new. Those give a perfectly clean beam.

[logsquared]

Out of 10 I have used 1 did exactly what you describe and the power was down maybe 40% or so (can't remember exactly). Also did everything you described... changed diodes, cleaned,etc.

[logsquared]

Wanted to add.. I think the original 405g was a Rochester A671 lens. http://ifolomedia.com/~rpoptics/uplo...alog_109A4.pdf

[andy_con]

edison the latest one i ordered was the same as yours

[edison]

Thanks losquared. Good to see i,m not the only one. Yes the original 405g was the rochester and i ordered those the first time. I made 16 modules with those and i was happy with the quality and clean collimation from them but with the latest the results are far worse.

Thanks Andy, it seems that maybe a bad batch slipped true or that Will decided try another supplier. He said the ones that i recieved where from the same supplier so it must be a bad batch?

But i have 37 lenses that i can,t use and 5 people that waiting on there 2 watt modules. Also the UKlem is coming up and dimitri was planning to show his 2 watt module.

Vjernst and richard are waiting in there modules. I think everyone here that build modules are in need of a supplier with a steady quality even if they are a few bucks more .

If anyone has similar results please come forward so this can be sorted.

[Solarfire]

Out of 10 I have used 1 did exactly what you describe and the power was down maybe 40% or so (can't remember exactly). Also did everything you described... changed diodes, cleaned,etc.

Do I understand correctly, you have a 40% power loss with one of your 405-G-2 lens?

@ Edison
Have you done any power measurements to determine loss? I haven't bought any recently but all the ones I’ve got are absolutely top and clear as a bell. Have you gotten in touch with Will about this?
The O-Likes will tend to be cleaner due too the much longer FL. Try an optima if posible.