LASERSCOPE ORION for sale

[Laserman532]

aaaahhhhhh man...what happened to those stellar pictures of the orion laser. I was hoping to make a "how to...and how not to convert a vag burner" thread.

Come on simon...have some pride! put back up the pics

[weartronics]

I will add...they do NOT like to operate CW.

Hi Pat, of course the efficiency is bad running CW, because the power density in the KTP is low. But can you explain why they don't like running CW? Why is it hard on the OC?

[Laserman532]

Hi Pat, of course the efficiency is bad running CW, because the power density in the KTP is low. But can you explain why they don't like running CW? Why is it hard on the OC?

it would take someone smarter than me to answer correctly. It has to do with the physics of what happens with the average circulating power cw verses the average circulating power q-sw. probably lesioQ could best address it.

the cavity is based on all hr's for 106, why the OC seems to be a victim with CW operation I cant explain...but it is...the first victim in a line of victims.

[DMills]

Handwavium follows, to do this properly needs a cavity model, I cannot be arsed.

Basically, green power rises as the square of the IR, and the OC is damaged by high average IR power.

With the Q switch operating you have very high peak IR power, and thus high conversion efficiency during each pulse (which implies relatively high cavity losses as the power converted to green is lost to the cavity), this means that while the peak IR power may be several hundred KW, the average may well be only a few KW (If you have an 800 with the dual wavelength option fitted then the IR beam is good for IIRC 150W, which if we assume a 95% OC implies that in this IR CW mode the intracavity power is 3KW which sounds ballpark).

So if the KTP is set up to extract say 5% of the circulating power as green when the peak IR power is hundreds of KW, then remembering the fact that the SHG conversion efficiency rises as the square of the power in the fundamental, when the Q switch is disabled then the intracavity power will rise until the KTP manages to extract sufficient green to make the cavity loss match the cavity input.
This is going to result in way high average intracavity power.

An example (plucking numbers out of the air):

If we have Q switched, peak IR intracavity pulse 250KW, KTP converts 5%, giving a peak green pulse of 12.5KW, and assume the action is 100ns long (also a square pulse, Ha!), then at 20KHz, the average green is 25W and the average intracavity IR is 500W (seems low, but I am plucking numbers out of the air).

Now lets see what happens if we disable the Q switch:
If we are still putting 25W of excess power into the cavity (big if, conditions are different), then steady state (as steady as it ever is with these) will be acheived when the optical power in the KTP rises to a level that 25W is being converted to green.
Now, the KTP converted 5% when the intracavity was 250KW during a pulse, so if the cavity was running 25KW we would see 0.05% converted, (125W, too high) so lets see what happens if the intracavity is 10KW, conversion is 0.008%, so at that level we would only get 0.8W of green.
Therefore the intracavity average power has gone from 500W to somewhere between 10KW and 25KW to be extracting 25W of green.
The reason we cannot make 25W in this mode is that the other cavity losses scale linearly with power and impose a limit.

It should be clear that even with only a few watts of green the intracavity average power is orders of magnitude higher for CW then it is for Q Switched operation.

Note the beam geometry in the KTP is setup to take the KTP to just below damage threshold during a Q Switched pulse, in a design for non Q switched operation you would have a far smaller beam in the KTP.

Disclaimer: Written at 5AM, the math may be off the wall, but you get the idea.

As to why it is the OC that dies first, I have no idea.

Regards, Dan.

[Laserman532]

^yeah, what he said i'm not book smart...I'm hands on

[Simon]

aaaahhhhhh man...what happened to those stellar pictures of the orion laser. I was hoping to make a "how to...and how not to convert a vag burner" thread.

Come on simon...have some pride! put back up the pics

The pictures were removed as the unit was sold and I needed the web space back
If the new owner (who is user on this site) wishes to put pictures up, that is up to him.

Perhaps you should shut the f*ck up and put some pictures of ones you have converted yourself.
I for one would be genuinely interested to see these as I am sure they will be far superior due to your experience and knowledge.

It is my opinion, you would not be happy with pictures of a perfect conversion as you seem to thrive on the joy of giving others your arrogant attitude just because someone else other than you has a scope or dare talk about one on this website !

My example here wasnt perfect in the conversion for show use but was used safely by me at all times and I never had any safety incidents in the 100+ shows I have performed since having it (and 2 other scopes !)

I am not stupid, I am technically proficient in the safe use of lasers.
Get over it.. !

[Laserman532]

The pictures were removed as the unit was sold and I needed the web space back
If the new owner (who is user on this site) wishes to put pictures up, that is up to him.

Perhaps you should shut the f*ck up and put some pictures of ones you have converted yourself.
I for one would be genuinely interested to see these as I am sure they will be far superior due to your experience and knowledge.

It is my opinion, you would not be happy with pictures of a perfect conversion as you seem to thrive on the joy of giving others your arrogant attitude just because someone else other than you has a scope or dare talk about one on this website !

My example here wasnt perfect in the conversion for show use but was used safely by me at all times and I never had any safety incidents in the 100+ shows I have performed since having it (and 2 other scopes !)

I am not stupid, I am technically proficient in the safe use of lasers.
Get over it.. !

my conversions??? you obviously dont get out much

here is one in a run of 5 identical units.
2 were sold to a concert promoter dont know where they are now
2 toured with Nsync when they were big, dont know where they are now

They probably wont impress you, but whatev. They do not come close to laseralex at LFI. But both are LIGHT YEARS ahead of converted vagina burners.

http://www.photonlexicon.com/forums/...ighlight=cobra

[LesioQ]

It has to do with the physics of what happens with the average circulating power cw verses the average circulating power q-sw. probably lesioQ could best address it.

the cavity is based on all hr's for 106, why the OC seems to be a victim with CW operation I cant explain...but it is...the first victim in a line of victims.

Yeah, SHG in KTP is a source of loss in resonator, it's a most welcome loss, especially where all the optics are set for no loss at 1.06.
But why OC ? Maybe the combination of HR@1.06+AR@532nm in single coating makes this mirror damage threshold lower ?

Besides of z-fold at risk at CW, there's also an important fact that CW operation shows large fluctuations of output power, when compared to well selected repetition rate q-sw operation. These fluctuations are quite deep and not nice in a scanned image.

Piotr.K

[QUAZAR]

Thats some tidy work there Pat.

[gogu]

Aren't the fluctuations a cause of an unstable region at a certain current setting for the lamp (not necessarily max current) when looking at a power curve. Or a saturated lamp at max current? Me thinks it would be just as unstable if its pulsed or in cw, perhaps less noticeable if pulsed.