Old 11-05-2015, 01:06 AM #1
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Default 6.5W -> 4.5W 450nm Cypreus IIIb reloaded with adapted 355nm Linos Beam Expander

This is one of the most powerful and dangerous lasers that I have created since now.
The combination of the three elements glass lenses and the Linos beam expander (355nm coated version) is astonishing:
I can focalize a very small collimated line far away and I start smoking the bark and the leaves of the trees at dozens of meters
almost instantly!
For reasons, I cannot use 405-G2 lenses in conjunction with Jetlaser BE or Linos BE because I encountered some bad issues:

- I cannot create a decent focus near of far away from the aperture: the spot diameter rest always big and I'm not able
to reduce it in any way;

- I cannot focus the fast axis and the slow axis together. When an axis is focused, the other one is out of focus. Strange behaviour;

- I cannot obtain a balanced gap between the min and the max focus range;

- The beam after the 405-G2 lens is out of perpendicularity and it enter inside the first lens of the Linos BE in a wrong way,
so the output beam is near the edge of the output lens and not centered, so I will have some extra loss of power;

- The beam maintain a noticeable divergence, and during foggies nights and a long exposure shot I will see some highly
diverging purple wings around the main beam;

- Linos and JL beam expanders are not able to eliminate the classical squares and aberrations of the 405-G2 lenses around the main dot,
so the result is an ugly long line surrounded by crap reflections.

My diode with 405-G2 lens without Linos BE peak near 6.5W @4.5A, while it peak at 4.5+W with three elements glass lenses
and Linos BE.
Usually the three elements glass lenses lose about 30% of the diode output power, while the 355nm Linos BE has not
the ideal coating for a 450nm diode and loss about 7% of the input power in reflection.
6.5W less 37% is about 4.1W, so my 4.5W output power was really a nice surprise.

Those were the original Cypreus IIIb components of my first build:



... but now the gentle soul of Mr. Angelos has rebuilded the head in a much much better way! Next six shots were done by Angelos.

Unmounted the upper part with the diode from the DTR copper heatsink, shortened the heatsink and applied the thermal paste:



Remounted the shortened barrel, soldered the driver and glued the modified half-moon driver heatsink:



Created a solid negative path:



Awesome polished heads ready to accept the modules (one for me and one for a friend of mine):



Nice perfect insertion of the whole module inside the head, glued the half moon heatsink to the main heatsink:



Spring soldered on a high current pill and inserted in place:



The host assembled:



The host assembled with a very nice adaptor created with the help of an high-precision CNC device by my friend
Dany from Fill Up company:





The fully assembled beast mounted on a quality Manfrotto tripod+clamp:







The 2 minutes performance graph:



At around 40 secs from the beginning there is a little diode kink and the worderful Angelos driver @4.5A try to stabilize
the current in a best way, so the diode earn about 150 mW of extra power .. really appreciated!
You can also see a nice ramp up to avoid cold-start potential damages to the diode.
After 120 seconds working time the laser head was slightly warm in normal environment use (23 C).
No overheating and no thermal protection was activated, so everything works fine at its best.

A small spot against a far building during daylight with no long exposure:



(Full resolution pic here: http://imageshack.com/a/img907/7408/yPS0qh.jpg)

An incredible tiny and collimated spot against my district belltower at about 200 meters from the laser aperture.
It is daylight, and You can see clearly both beam and dot without the aid of a long exposure:



(Full resolution pic here: http://imageshack.com/a/img911/5971/5ZuL8X.jpg)

The power of a super-collimated beam:



And finally, the magnificent collimated beam in the night:

(with a UMI Zero 13 MPixel phone cell and no long exposure)







(with a Samsung 8 Mpixel compact flash camera and long exposure)



Conclusions.
With this build I'm really in love. What can I ask for?
All my other projects pale in comparison to this!

This time I have to thanks a lot of people:

- DTR for the diode pressed in a copper heatsink;
- Sinner for the beautiful rock solid host;
- Angelos for his wonderful drivers and for his honesty, patience, precision and professionality;
- Daniele from FillUp company for CAD design, CNC programming and item machining;
- Linos company for their high-end quality beam expanders.

See You soon for my next builds. I promise You to show up early two big news with a nice new entry among
my major helpers .. CDBEAM777 !!!

Richard.


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Last edited by Minamoto Kobayashi; 11-07-2015 at 12:55 AM.
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Old 11-05-2015, 11:33 AM #2
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Default Re: 6.5W -> 4.5W 450nm Cypreus IIIb reloaded with adapted 355nm Linos Beam Expander

That is a gorgeous build.

I'm amazed that you get that good of a beam and 4.5 watts without cylindrical correction.
I bet you hardly get any loss through those excellent beam expanders optics.
Most your loss is likely edge clipping?
I bet with beam shaping you would get another watt or more and an even tighter beam, but it is really a great result as it is.

How is it for heat build up?

Edit: Ok I see you already posted that.
After 120 seconds working time the laser head was slightly warm in normal environment use (23 C).

Last edited by RedCowboy; 11-05-2015 at 11:38 AM.
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Old 11-05-2015, 12:02 PM #3
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Default Re: 6.5W -> 4.5W 450nm Cypreus IIIb reloaded with adapted 355nm Linos Beam Expander

If I only had the patience to wait for all the parts to be made....

Sick build as always. Doing a build myself with a LG 10x beam expander myself soon. Still need the diode but other than that it's basically done.

How bright would you say this diode is compared to the NUBM07E?
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Old 11-05-2015, 04:28 PM #4
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Default Re: 6.5W -> 4.5W 450nm Cypreus IIIb reloaded with adapted 355nm Linos Beam Expander

nice job here is some rep
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Old 11-05-2015, 09:35 PM #5
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Default Re: 6.5W -> 4.5W 450nm Cypreus IIIb reloaded with adapted 355nm Linos Beam Expander

Quote:
Originally Posted by Minamoto Kobayashi View Post

That's not polish, that's magic!

The entire assembly looks like some high-tech sci-fi deus ex machina.

I love it. + Rep for sharing!
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Old 11-05-2015, 11:56 PM #6
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Default Re: 6.5W -> 4.5W 450nm Cypreus IIIb reloaded with adapted 355nm Linos Beam Expander

Thanks for the appreciations and for the +rep to everyone!

x Redcowboy: the dot shape after three elements glass lenses shows not only a shortened line but also a more consistent rounded one.
The power loss was both for the parts of the line truncated and part for the back reflection of the 355nm coated lenses.
Unluckly there are not an ideal corrective optics for this diode.
CDbeam777 said to me that using the same corrective optics used for NUBM07E 465nm and NDG7475 520nm diodes shows a nasty dot.

x Gozert: the NUBM07E has the same power of my build after beam expander but has a shorter line profile, it is much brighter and of course more beautiful to see.
In fact my next project will be really amazing, because I will use a NUBM07E with G2 lens, corrective optics and Linos BE !!
This is the bright comparison of the two diodes:

DOT

http://lsrtools.1apps.com/relativebr...useRaleigh=off

BEAM

http://lsrtools.1apps.com/relativebr...&useRaleigh=on

The NUBM07E diode has a short line that can be corrected using a pair of corrective optics lenses. The Linos BE will conclude the opera at its best.
The light intensity or irradiance (output power / area of beam spot) of a so corrected and collimated powerful beam will be something never seen
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Last edited by Minamoto Kobayashi; 11-06-2015 at 03:02 AM.
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Old 11-07-2015, 09:13 PM #7
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Default Re: 6.5W -> 4.5W 450nm Cypreus IIIb reloaded with adapted 355nm Linos Beam Expander

best build I've come across yet lol +REP my friend. By best I mean, cleanest, awesome picture quality, and bad a** looking host!
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Old 11-10-2015, 09:59 PM #8
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Default Re: 6.5W -> 4.5W 450nm Cypreus IIIb reloaded with adapted 355nm Linos Beam Expander

Beauty of a build in that chromed out Sinner host. Have one of those for my 1.5W 520nm build and wish others would hook up with him for such a wonderful host. They really stand out. Great matching collar design too.
Just posted my 6W 465nm (470nm) build today and love how large a difference there is between it and my 462 (464nm). Amazed at how everytime I go up in wavelength with my blues how each successive makes the last look purple side by side. Didn't expect it to make the 464nm look that violet after the 464nm made the 445/450nm look so violet (I use purple and violet interchangeable).
Wnyways, quite the build and +REP
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Old 12-22-2015, 10:23 PM #9
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Default Re: 6.5W -> 4.5W 450nm Cypreus IIIb reloaded with adapted 355nm Linos Beam Expander

Very nice build. I have one of these hosts that I used for a 635nm 1 watt. I'm thinking of repurposing the host as it can handle much more than what I did with it. + REP.
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Old 12-24-2015, 10:16 AM #10
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Default Re: 6.5W -> 4.5W 450nm Cypreus IIIb reloaded with adapted 355nm Linos Beam Expander

I always wonder about something like this as that's a lot of lost "wattage" being absorbed by the lenses. Apparently it's not an issue though.
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Old 01-03-2016, 11:09 PM #11
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Default Re: 6.5W -> 4.5W 450nm Cypreus IIIb reloaded with adapted 355nm Linos Beam Expander

Cool setup, and quite a successful one! Congrats.

Have you measured the beam diameter at the output of the beam expander, or the beam divergence?

Any pics of the projected dot at range would be nice to see. I found almost any small 8x or 10x binocular (or monocular) make for a nice beam shaper/focuser.

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Old 01-03-2016, 11:16 PM #12
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Default Re: 6.5W -> 4.5W 450nm Cypreus IIIb reloaded with adapted 355nm Linos Beam Expander

Quote:
Originally Posted by Pman View Post
I always wonder about something like this as that's a lot of lost "wattage" being absorbed by the lenses. Apparently it's not an issue though.
I expect his loss is in edge clipping, power going into the metal from the wide part of the beam getting clipped.
Those lenses are likely very efficient, but he has a 3rd and maybe a 4th relay lens in that beauty, awesome expander.
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