We know the game!
At HiLASE we achieved exciting results with our laser induced damage threshold (LIDT) testing system equipped with a specific demagnifying telescope. This setting allowed us to deploy a collimated beam instead of the classic convergent beam for our tests, thus increasing the size of the beam in the plane of incidence and enabling us to use a top-hat beam.
Currently, we operate with a 3 x 3 mm2 top-hat beam at 1030 nm, 10 Hz, 10 ns at an energy level up to 1 J, which provides us a fluence of up to 12 J.cm-2, unachievable with conventional beams.
With more improvements in plan, we expect to achieve the energy level up to 4.5 J and corresponding fluence up to 50 J.cm-2. Our new LIDT capability offer effective measurements for even large scale optics, i.e. we can evenly expose the entire surface to the threshold fluence with the collimated top-hat square beam, hence reliably expose and detect all possible defects.
Our upgrades will also allow LIDT testing under 2nd and 3rd harmonics (515 nm and 343 nm respectively).
Using large size square top-hat beam, we are also able to conduct ISO standard measurements (1-on-1, s-on-1) and perform customized measurements, such as ramp and raster scan measurements.
If you want to know more about our LIDT capability please come visit us at SPIE Photonics West San Francisco, booth #3485, Hall E in the Moscone Center on the 4-6 Feb 2020.