“The $14m Texas Petawatt laser reached greater than one petawatt - one thousand million million watts “
“Warning: Avoid staring directly into the beam”
Wrong warning.
The correct warning is “No not look into laser with remaining eye”
Ten petawatt-femotoseconds would be ten joules. While that would be powerful enough to blind someone, the hazard level is nowhere near what the "petawatt" number would suggest. For most purposes a laser that output 10,000 watts for a millisecond would have about the same effect.