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Three (3 ) Axis Adjustable LD Mount

logsquared

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HEY LOG, What is this supposed to be ?
What I posted earlier. Maybe you missed it.

"Here is the back of a 10X P73 combiner I was just prototyping. It worked pretty good. Rotation is still a bit finicky but can be done with some patience. On the plate that holds the diode I cut a slot and drilled two holes. The slot allows me to use a small pliers to set rotation and the holes allow a small screwdriver to "push" the diode left or right. This is all the adjustment needed to align 10 diodes with 6X cyl correction. Of course there are probably a million ways to do it. This example is just one."

Basically just showing how simple it is to make a mount the allows X,Y translation of the diode and therefore correcting the angle the beam leaves the lens.

I think I might still be missing something. That is why i asked originally. But it seems people are looking to have the beam exit straight or some form of adjustment of the beam angle to allow correction and expansion after the collimator. Im trying to show/ explain the method I used to do this.

I highly doubt that a person can perform 0.001mm resolution with "bare hands" (though such precision is not needed anyway to align the relative diode-lens position). Making the diode movable in xy have to be designed in such way, that the heat transfer is still good enough for a handheld device.

Singlemode
You can. It can be done with the type mount I show. Depending on the power of the collimation lens .001 probably not necessary. With a 2mm lens I would guess ~.005mm is needed to keep the beam straight and the spot from excessive aberrations. Heat transfer is fine with copper base material. On 9mm diodes the landing can be made to have more surface area.

Keep in mind if the beam angle is multiplied by the expanders. If you start with say .5 deg off axis after a 8x cylinder set-up its 4deg of then a 3x spherical expander its 12deg off! So, initial tolerances and allignment matter here. If it didn't we wouldn't be having this conversdation:beer:

Only high-end lathes or CNC machines can reach a precision of 0.001mm, a hand is not possible
Maybe you wrong
Yes it would be very hard to machine this tolerance. That is why you move the diode manually to line things up.

I wonder if you can get it smaller to fit the smaller diameter modules. Now that would be neat :beer:
Im sure it could be done. I have made modules with .75 inch diameter, 5.6 and 9mm diodes. Using smaller screws it could be .5 diameter.
 
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You can. It can be done with the type mount I show. Depending on the power of the collimation lens .001 probably not necessary. With a 2mm lens I would guess ~.005mm is needed to keep the beam straight and the spot from excessive aberrations. Heat transfer is fine with copper base material. On 9mm diodes the landing can be made to have more surface area.

Keep in mind if the beam angle is multiplied by the expanders. If you start with say .5 deg off axis after a 8x cylinder set-up its 4deg of then a 3x spherical expander its 12deg off! So, initial tolerances and allignment matter here. If it didn't we wouldn't be having this conversdation:beer:
I am willing to bet (and spend my winnings to the LPF) that you are not able adjust with 0.001mm (even 0.01mm). You definitely can find a position where the beam is straight over the length you are looking, but has nothing to do with precision.


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Singlemode
 

logsquared

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I am willing to bet (and spend my winnings to the LPF) that you are not able adjust with 0.001mm (even 0.01mm). You definitely can find a position where the beam is straight over the length you are looking, but has nothing to do with precision.


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Singlemode
I'm not exactly sure what you are getting at.

You definitely can find a position where the beam is straight over the length you are looking
Isn't this the important part? Is this not what we are trying to accomplish?

If you mean you can't know if the diode is "exactly" in the middle. This is true without special equipment.

But if you mean that the diode can't be moved with .01mm resolution relative to the lens by hand (with a screwdriver) then bet on.

What do you wager? :yh:
 
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I'm not exactly sure what you are getting at.



Isn't this the important part? Is this not what we are trying to accomplish?


You claimed that you can position with 0.001mm precision, and I don't believe it neither I think it is necessary.


If you mean you can't know if the diode is "exactly" in the middle. This is true without special equipment.

But if you mean that the diode can't be moved with .01mm resolution relative to the lens by hand (with a screwdriver) then bet on.

What do you wager? :yh:

20$, here the definition of precision:
https://en.m.wikipedia.org/wiki/Accuracy_and_precision


Singlemode
 

logsquared

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It sounds like you want to argue semantics. That is kinda lame as I said in my rant earlier.

Anyway. I figured I would use my time more productively.

I built a 3/4" round test rig for someone here to try. (link to pics at bottom)

Basically its a simple mount with M9 .5 threads on each end. One end is for the diode and lens. On the other end a BE can be screwed in. It has a flat milled out to place cylinders.

The diode is placed in a copper holder and is clamped in with a screw. Then the holder is screwed to the aluminum body. The mount should have very good thermal conductivity. However, there is not much surface area or mass to the body. Long term heat build up will be a problem unless this is mounted to a heatsink of some kind. It should work well as a test platform for alignment though.

Note: the picture shows an old 3W 445 with the lens attached. This is is the only free 9mm diode I had free. The mound is meant to be used with a separate 9mm lens screwed in.

Any body with a set of loose cylinders and M9.5 BE is free to give it a shot. I will mail it to them. No charge no strings. I think whoever tries it will see the advantage of getting away from the pressed in mounts.

Here are some photos. (disregard the first photo of the combiner)

https://photos.app.goo.gl/pB4Njmo5hQFW2X2H9
 
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logsquared

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I volunteer! That would be nice to have.
No problem. Got your PM.


Ok, so after lunch I built another one since my machines were still set-up for it. Anyone else want one? All I ask is some feedback + or - on how it worked.

Also, Sorry to Bob CDBEAM777 for the hijack. It wasn't my intention.
 
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It sounds like you want to argue semantics. That is kinda lame as I said in my rant earlier.

Anyway. I figured I would use my time more productively.

Good decision!


Basically its a simple mount with M9 .5 threads on each end. One end is for the diode and lens. On the other end a BE can be screwed in. It has a flat milled out to place cylinders.

The diode is placed in a copper holder and is clamped in with a screw. Then the holder is screwed to the aluminum body. The mount should have very good thermal conductivity. However, there is not much surface area or mass to the body. Long term heat build up will be a problem unless this is mounted to a heatsink of some kind. It should work well as a test platform for alignment though.

Note: the picture shows an old 3W 445 with the lens attached. This is is the only free 9mm diode I had free. The mound is meant to be used with a separate 9mm lens screwed in.

Nice mount, thanks for sharing.

Singlemode
 

CDBEAM777

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Hmmmmm….All very interesting....Very Interesting indeed !!!

LS....as typical....you have ingenious designs !!! I have modeled ( Read Copied ) some of my work after yours....and/or....at the very least.....some of your work has given me cause to think about our HH design challenges. Note: Much of LS's work has been posted over at PL....but is applicable to the HH arena !!


I will add that the initial combiner ( Lab) on Blue/Green Photon Smashing/Combining...was the reason the Cyan Cannon project was born !!

Anyway....I have modified the Three (3) axis design....slightly ( See attached cartoon)....as in reduced the unit width....from 17.9mm to 15.9mm This was done to provide a 1mm gap between two (2) units in a Combiner Design of 2.25" OD design ( See thread on the community dual 044 build ).


So....keep the dialog going !!!!! We may use these designs in the future. IMNSHO... Adjustability is extremely desirable in beam alignment for a multi-component system...as in LD + CLenses + Beam Expander. So...easy to adjust and clamp in position....should be even more desirable.

Thanx to all.

CDBEAM
 

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