Estimate the IR power from a Z-fold Laserscope

[weartronics]

Hi PL,

Can anybody estimate the IR power inside a Z-fold Laserscope resonator? I know it uses 4mm x 79mm Nd:YAG rod with 1.1% atomic doping and the lamp power is up to 4.5kW. But what do you estimate the IR power inside the resonator would be, 100W? That would be 2.2% efficiency. NB: this is disregarding Q-switching and KTP altogether, imagine those components are removed.

Best regards,

weartronics

[mixedgas]

100 watts IR, qswitched in medical IR mode. That came up gooling ktp532 IR, which is 30 watts green.

If you know the IR oc transmittance, you can work back to the cavity power.

Steve

[Laserman532]

100 watts IR, qswitched in medical IR mode. That came up gooling ktp532 IR, which is 30 watts green.

If you know the IR oc transmittance, you can work back to the cavity power.

Steve

100w of IR is nominal through a 2% t LAM mirror @ 35 amps. anything over about 85 watts IR will make 40 watts 532 if ktp & q sw are in good shape.

[Laserman532]

read your post closer- no ktp, no q sw 2% T LAM mirror expect 50 watts benchmark@ 35 a.. Expect 100w q sw 2% T Lam no ktp

[LesioQ]

My best guess would be 200-400W CW, assuming no IR OC installed, just full IR feedback original optics. Actually You can measure it by precise testing of one of Your optic, say flat HR for IR transmission. With 99.5%R optic this will be very small fraction of IR, below 1%. You can determine this percentage precisely using other working 1.06um laser, then installing this calibrated HR into Your z-fold and measuring the actual leakage. I was getting about a watt this way, though no calibrated HR was used. Assuming mirror was 99.7% this would be over 300W of intracavity circulation.

However to calculate effeciency of SHG You would need to measure 1.06um leakage through HR during SHG operation. KTP in the cavity is a source of losses, so IR circulating would diminish. To measure IR leakage You need a filter, so You not measure arc lamp energy.

Piotr.K