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The Chartreuse Coruscation

RedCowboy

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Hello….to all you watching the “ CHC Build TV “ !!! Yet another episode !!!

OK…I have been considering this change for some time to the Chartreuse Coruscation … See the attached drawing CHC-H-BE 532 with PP V7.

In the past…I have used a simple rectangular Ally plate to mount all the component on first…to verify the design and alignment geometry. I have then used this plate…to transfer the hole placement as a template to the H-BE frame floor.

The reasoning behind this is….I have ONE shot…to get the mount holes in the right place. IF they end up in the wrong place…..well….ALL the machining work time invested in the H-BE Frame….may go to waste….A new H-BE ,may be demanded. CRAP !!

So…I have been thinking…..how to make this…and future builds….simpler !!

SO….why not….use the Ally template….in a permanent fashion. To do so….will save the need to re-drill all the component mount holes….and the tedious re-alignment process. Just mount all the components to the 3.01 mm thick Component Sub Plate. Do the alignment of all the components ( just once)….and…in a modular fashion….drop in the populated Component Sub Plate….verify centre axis alignment between the Component Sub Plate and H-BE frame….bolt the Sub Plate to the H-BE frame floor…and…we a good to go !!!

If one screws up the Component Sub Plate….just make another !!!!! NO risk to the H-BE unit !!!

Fortunately…the JetLasers 532 OEM…has the perfect base to beam height at 12mm….and a popular USA Ally plate thickness is 3.01mm………so…that is PERFECT….That is what I need to align the JL 532 OEM to the H-BE output elevation.

WHAT LUCK….I just hit a Lottery !!! This NEVER happens….NEVER EVER……!!!

SO….I must machine a slice off the LSP RED LD mount….so that the Red beam is at the exact elevation as the Green beam. THAT is easy to do !!!

I just thought I would share this with you….A EURKA moment indeed !!! SO…you can see…there are always surprises !!!

Unexpected turns and refinements that one can do. Yes….eventually….things….are….what they are !!! So it goes……BUT….there are refinements possible….course corrections….during the build. The CHC build has had a few !!!

Hope you enjoy ALL this detail……for….to some degree…..with such detail….you can be more fully immersed within the build process. You can share in my both good….and not so good moments !!! Hey….hopefully…it is at least….er….ah…..entertaining !!! CDBEAM

View attachment 62567
It's more than entertaining, it's ........enlightening :D
 

CDBEAM777

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I still wonder how well you will be able to match the beam specs of the 532nm laser with that prism pair. Most of the DPSS lasers have much better divergence specs than even corrected direct diodes. Time and a lot of patience will tell.
While waiting for the 532 OEM Module to arrive from Jetlasers....I have been doing some divergence measurements on the GH0637AA2 Red Diode.
DTR supplied the newer G3 Collimation lens. THANK YOU DTR !! THIS is the best.... on This LD.... As you may remember....I do NOT have the room for a set of C-Lenses`.

SO....I do have room for a set of Anamorphic prism optics. With the first prism set at 140 degree ( Angle of Incidence) to the Red beam axis......I get a divergence of 0.91mRad. That is good !!!
SO...at 36' (11M) a geometry of 12mm width is obtained. The Collimation lens is adjusted to provide a 12mm x 12mm round cornered rectangle.
I predict...This divergence will be adequate to match the divergence of the 532 OEM. Actually....the current Red divergence is less than the posted
1.5 mRad divergence of the 532 OEM module.

SO....I may be able to lower the Angle of Incidence of the first prism....thereby decreasing the power loss associated with Anamorphic Prism optics.
The greater the angle....the greater the slow axis magnification. The greater the slow axis magnification...the lower the Far Field beam divergence will be.

At 0.85A ( Seems to be the knee of this LD )…..power output is about 500W. That is OK....considering the optical loss !!! I would prefer more....BUT.....that is the best this LD will do.

But...as is typical. with optics...the greater the angle...the greater the loss of output power !!! Almost never can you catch a break !!!

Fortunately, Cylindrical Lens optical correction does NOT suffer from this attribute ....but then.....more Far Field aberration is a tendency/possibility with C-Lenses !! Again....the universe seems to always have a " Price to Pay ". This seems to be annoyingly true in the area of optics !! So it goes.

CDBEAM
 

RedCowboy

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This might have already been said in the previous pages but if not I wonder if you can make your red beam square via. your prism pair then match the beam dia. and divergence of the squared up red with the green by adjusting the output beam expander lens set? As you know what exits the crystal is typically a pretty small dia. and employs a pcx-pcv lens pair that you could tune as well as setting the distance from the crystal and starting dia.
 

paul1598419

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The G3 lens has an EFL of 8 mm. Much of your beam improvement is due to clipping of the sides of the divergent line it puts out. This is one way to go, but is it the best? Just something to think about.
 

CDBEAM777

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This might have already been said in the previous pages but if not I wonder if you can make your red beam square via. your prism pair then match the beam dia. and divergence of the squared up red with the green by adjusting the output beam expander lens set? As you know what exits the crystal is typically a pretty small dia. and employs a pcx-pcv lens pair that you could tune as well as setting the distance from the crystal and starting dia.
RC Good point ! Here is the situation;

* The Red LD GH0637AA2 can achieve a mRad of 0.91 @ an output of 400mW - using Anamorphic Prism Pair optics
* The Red New 63283HD Red LD can achieve a mRad of 1.5 @ output of 820mW - using 6X Cylindrical Lens set optics
* The 532 OEM will likely have a divergence of 1.5 mRad ( Not yet verified )

We must solve Four (4) variables at the same time;

* Far field divergence match between the Red/Green LD units.
* Perceived colour of " Electric Lime Green " approx. 555 nm when the dual diode outputs are combined.
* Maximum output.
* Minimum Far field beam geometry.

Hahahaha...that's all !!!

It is a real balancing act !!!....and ...really....I am not sure how it will turn out !!! A more clear path will surface....when I receive the 532 OEM module and experiment !!!!! Enjoy the ride....I know I DO !!

CDBEAM
 

CDBEAM777

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The G3 lens has an EFL of 8 mm. Much of your beam improvement is due to clipping of the sides of the divergent line it puts out. This is one way to go, but is it the best? Just something to think about.
THANX Paul !!!!!!!!! I did not know that !!!!!!!!!! Yes.....since the G3 is a clipper...Yes....that is where I am also losing power !!!

OK....I will NOW go try some different Collimation Lenses...3 element( Another Clipper though ) , G2, F2....and some others....and see what I get for Power Output vs Far field divergence !!!

WOW...always room for and appreciation for learning something new !!! Thanx again !!!

CDBEAM
 

paul1598419

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Good luck, Bob. I'm still looking forward to the finished laser. They are always worth the wait.
 

CDBEAM777

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Well....as expected....with a G2 Collimation lens divergence goes up to 2.0mrad...BUT.......Output Power goes up to 750 mW at .9A current in !!
OH....and Prism Pair remains at 140 degree Angle of Incidence. NO FREE LUNCH !!! Will try a Colli with EFL=2 next
The acceptable divergence really depends on what the 532 OEM delivers....right now....THAT is a BIG Wild Card !!!

Note: I may end up with the Red New 63283HD LD with a set of Cylindrical Lenses....BUT....to do that....I MUST modify the H-BE frame....and make the saddle length longer. Things seem NEVER to be easy !!

CDBEAM
 
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paul1598419

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You're right. There's no free lunch. The G2 has an EFL=2.39 mm, so don't expect much difference at 2 mm. Sometimes you just have to rethink your project to get where you were hoping to all along.
 

CDBEAM777

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Yes....a " Rethink " was done !! Well....I have decided that the Anamorphic Prism Pair SUCK too much Optical output !!! I will go back to the original plan....a set of 6X Cylindrical lenses ( From the recent Group Buy ) !! See drawing attached CHC-H-BE with 532 Mod Blivitz 7

So...the Best Output Power, Lowest Beam Divergence yet achieved with several LD's trialed;

GH0673AA2 LD
2MM /EFL Collimation Lens
Output achieved = 663mW
Current in @ 0.90A
Near Field beam @ 3mm dia.
Far Field beam @ 13.95mm wide x 13.50mm height ( @ 36' / 11.0M )
Divergence achieved @ 0.997 mRad
6X Cylindrical corrective optics

Not Bad !!… All other LD's ( HL63193 and 63283HD ) tested delivered minimum 1.55 mRad !

SO....this is how I will go !!! I can only hope this is enough Red Photons.... when combined with the 532nm line....will deliver the " Electric Lime Light " colour I seek !!

Jetlasers have shipped the 523 OEM. I will likely need to mount the 532 OEM driver board external to the host case...….just the way it goes !!
I am toying with the possibility of fabricating a nice Brass handle....like a drawer pull....and mounting the driver inside the handle ???....and attaching the handle to the OD of the Host unit......This add-on will be Less streamlined....more Steampunk....So it goes !! Not sure how this will look ???? The Build is already honk 'in long with the Beam Expander on the front !!

Note; a return to using the Cylindrical Lens optics will demand opening up the flat platform length on the H-BE frame to 124.40 mm......just NO other way !!

CDBEAM

CHC-H-BE with 532  mod BLIVITZ  V7 .JPG
 
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