The Big Green Thread (I'm gonna regret posting this in the morning)

[mixedgas]

One other issue, each vendor has their own cut and doping of KTP or LBO. Specifying a 3x3x5 mm piece of KTP cut for 1064--->532 can get you wildly varying parts.
This matters at powers over a watt.

Thus the parts supplier list is rather narrow.

For those in the quest for drawings/data/papers to spring ahead... Relax, I'm working on a way to do this legally and post it at PL. Prossibly on Sunday.

Please remember I work a 45 or more hour week and have 20 hours of commute a week.

Those who know me know I now hate to promise anything.

Steve

[badger1666]

Can Anyone reccomend safety goggles before i having ago at building my own green ?

[mixedgas]

We know its going to be Vandate + Type I SHG for internal polarization and a wide pump band.

YAG and a waveplate with type II SHG might give more power, but hitting the required +/- 1 nm pump band is way too expensive

We can also try direct to band pumping at 880-885.

PLAN OF THE DAY:

We need the to calculate the lengths of the KTP/LBO and the Vandate.
Then we need to calculate the cavity and check it.
Then find the closest standard parts for a 1064 nm unit.
Buy the standard parts and breadboard ONE unit.
Measure the ROD lensing using a hene or 1064 nm laser and compensate accordingly.
Maximize the rod adsorption.
Then install the KTP/LBO.
We'll use OC transmission estimates from scientific papers and calculations.

This will not be a cookie-cutter copy from existing lasers.

Right now I know that 2 pump diodes are more economical then one big one.

12 to 16 watts of pump will be needed, trending toward more for good modulation characteristics.

If that scares you, or is too expensive, consider starting another thread for the 158$ Vandate-MGO modules and be glad to have ~1 watt.

Steve



I've sent data to Planters to start that.

[mixedgas]

Can Anyone reccomend safety goggles before i having ago at building my own green ?

AT these power levels, a minimum of Thorlabs LG1, LG9, or LG10. Possibly something better.
169 USD a pair or 445$ a pair depending on model. Check the curves before ordering, make sure your OD4-5 or better at 808 and 1064.

My personal choice is to block 808 and 1064 more then I block 532.

I have 2 pairs of LG10 (445$) at work for piece of mind on the wideband lasers. My co-worker likes to see the green and has the LG1 or LG9.

Just a note, 35$ goggles DO NOT MAKE SENSE at 12 watts of 808.

We use SILICON CCD based cameras when working at 800 nm. It just makes plain sense, and with the right C-mount camera and the right lens with a adjustable iris, it works better then a FIND-IR-SCOPE at 808. CMOS webcams do not have the dynamic range that a Silicon CCD secuirty camera does. Thus they are nearly worthless above a watt of IR. Ebay is your friend here, about 20-30$ for what you need, used. Plus a 20-30$ USB frame grabber.

You will need a stack of white business cards for alignment. These do not align well with a external laser type alignment. It can help to have the HENE around.

Steve

[Meatball]

So are you and Steve-o and Planters doing cavity design?

I was reading through those links you provided, and none of the designs seems to lend themselves better or worse to modulation. Is there cavity type with the "fastest" transient of sorts? Or does it not matter in the end? You just modulate the pump, no matter the cavity shape otherwise?

[mixedgas]

So are you and Steve-o and Planters doing cavity design?

Not sure yet. I'm going to try to make this open as possible. There are a few things I need to keep mum, one piece of software, but not that many other items.

I can't go republishing everyone else's academic work. I know that is miffing off a lot of people. Planters has a academic affil, so I can send him stuff.

I was reading through those links you provided, and none of the designs seems to lend themselves better or worse to modulation. Is there cavity type with the "fastest" transient of sorts? Or does it not matter in the end? You just modulate the pump, no matter the cavity shape otherwise?

Fast response,, as far as I can tell, is based on the thermal inertia of the crystal vis a vis spot size in the crystal.
The question is which crystal to optimize the path in. Looks like the Vandate at first.

Care to guess what I can't find GOOD papers on, so far??? MODULATION!

The first laser has to be a Miatta, so we can get some data.

I just updated this post. Ladies and Gentlemen, a attachment has appeared!

My thanks to the Korean educational system and Misters Jonghoon Yi, Kangin Lee, Youngjung Kim and Dr Jin Hyuk Kwon for making the attached paper accessable.
"The Effect of a Transient Thermal Lens on the Nd:YVO4 Laser Output" is attached.


Steve

[mixedgas]

I just attached a paper to my last post.
This post is so "list" people see the update.
Steve

[steve-o]

So are you and Steve-o and Planters doing cavity design?

Noooo !! Not me . I have no experience in this sort of thing. I put laser diodes and lenses together.. that's about it..

[badger1666]

a nice little side pumped L cav 2 watter http://www.youtube.com/watch?v=9X98i6PfP9Y
and he has a few other nice vids too http://www.youtube.com/watch?v=y2tjYVeKrLk&feature=plcp

[mixedgas]

a nice little side pumped L cav 2 watter http://www.youtube.com/watch?v=9X98i6PfP9Y
and he has a few other nice vids too http://www.youtube.com/watch?v=y2tjYVeKrLk&feature=plcp

Little? That boat costs almost as much as the house I live in.....

Badger, SRM is very wealthy. He has things in his collection that boggle the mind. When he passes on, several complete labs will be made out of his warehouse.

Your mission, should you decide to accept it, is to get him to give you pump diode watts vs green output for that design, and the focal lengths of all cavity elements.

Then get him to tell you why that laser has all VACUUM grade optics mounts. Oh wait, he works at CERN... Question answered....

The whole laser on a TEC? For Us, I dont think so.....

Steve