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ED50 as I understand it is that 50% of exposures result in Detectable Damage. Now do the same study to achieve a less then 1 in 100,000 or 1 in 1,000,000 Statistical Chance of Detectable Damage., which is ( I think) the requirement for Class IIIA and Class II in Humans, respectively...

A blue box contains a Diode driver with serious current capability and three TEC controllers plus some other goodies with a knob for current on the front. Chris, I talked to Kevin, he has two in working shape. One has your name on it for the next 48 hours, Steve

He's checking to see if he has another blue box. I'll tell it to hold it for you. Steve

Gain bandwidth on ND:YAG is 1.5 nanometers at 1064.1 and there is a second weak line at 1066 or so that has a similar gain bandwidth. They just overlap a bit. As the KTP warms up it acts as a birefringent filter and tends to select a wavelength. So you may, and I HAVE seen it, drift in...

Hold up your left hand with palm toward you. The ND:YAG Adsorption curve at 808 is a series of spikes about 1.5 nm apart that looks like your fingers. Oh, Wait, I found one. This is when pump diodes in cheap lasers are really heated up you see a bright, dim, bright, dimmer, not so bright...

So I put on my Senior Engineering Technician, Grade Two, hat... I've been off working on something, 12 years till retirement. Due to budget and staff cuts and buyouts of professors for early retirement, I have roughly 100 grad students who can "ring my bell" and I look after the teaching...

You cannot change the cavity dimensions. The mirrors are placed to put a beam waist inside the cavity at the doubling crystal in order to ensure enough power density inside the crystal to enable doubling. When they design the cavity they want the beam volume to fill the YAG rod as well...

OK, Now before every one gets happy, and hundreds of LPFers senselessly download the software, and start fantasizing about potential new laser wavelengths just because the software will calculate a crystal, forget about it, in the real world it does not work that way. You still...

Be aware that there are 10 or more lines that can lase in the ND F manifold, I checked a friend's ancient green Nd:YAG based pointer the other day and found 1084 lasing with 1064. Be aware that 1064 has a weak sister line about .2 nm away from the primary 1064. In YAG 1064 has about 1,1 nm...

Alaskan, Two fold mirrors are used to precisely set height and exit direction so all units are interchangeable in the field. A collimator lens to set all diameters equal from unit to unit between the mirrors, and I would not be surprised if there is a waveplate inside the collimator to...

Yes, the 13xx lines have about 1/3rd the gain of 1064 where as 1121 has about 1/6th. That and the fact that the extra 100 nm gives the coating designer some wiggle room. I know a gentleman who was wealthy enough to have custom mirrors made for an 800 series KTP 532.. 15 watts of 659 was a...

BTW, see that intracavity wavelength filter on the yellow? Pro Tip, there are weak Nd:YAG lines close (a few nanometers) to 1123 that will lase at very low energy, but will suppress the more powerful 1123. For example, 1121 nm. Don't change the filter tuning, as the filters are angle...

Yes, the Yellow is 600 mW long pulse, rated as delivered to the patient. The red is 659 nm @ 600 mW max Delivered. The Green is 532, 50 mW to 1.5 watts delivered. Pulse times were 0.05 to 3 seconds. Hence my warning about low duty cycle being a design function on the green laser. I have...

Yeah, I have a friend who services those. I've been in the room when he works on them. They are horribly multimode by design, to ensure a uniform light pattern out of the medical fiber onto the target. . They have the divergence of a flashlight, expect to have to collimate. Designed for...

I often see posts where forum members say "They (insert government agency here) do not have jurisdiction over me/you/us". Ever wonder what happens when a Federal Agency decides to explore where and when it's jurisdiction begins and ends? This is for drones, not lasers, but you could see what...

Please tell me you did not breath in the vapor from one of the most cytotoxic , mutagenic, cancer causing bulk materials on the planet? Yeah, we need trace amounts of it to live. But what long term exposure does to your lungs, skin, teeth, kidney, nervous system is VERY bad. Yeah, the fumes...

Thorlabs sells an OD6 dark glass interference filter for 58$, If you must that is the way to go for CW powers up to 500-1000mW or so.. Even with one of those in place, I still check with a LPM before exposing the CCD... I had a grad student destroy a vidicon based camera with a F1 lens using...

I'll pm you shortly. Thanks, Steve

Having "Seen" TPA the levels of peak power involved can be from very low to very ridiculous. .. Was in a forging country visiting a laser lab complex ... " Hey, look through this door!" " Is it safe", says I" , Oh Yeah! So I look, "DO you see Blue Stray Light Everywhere?" "That's...

Greater Watt, Where are you located? I'd like to run down 609's origin before Sam Goldwasser passes on. It is one of Lifes Mysteries for him... Thanks, Steve