Page 32 - CFM-Annual Newsletter 2021

Laser Damage Threshold

The laser damage threshold (LDT) or laser-induced damage threshold (LIDT)

is the limit at which an optic or material will be damaged by a laser given the
fluence (energy per area), intensity (power per area), and wavelength. LDT
values are relevant to both transmissive and reflective optical elements and

in applications where laser-induced modification or destruction is the
intended outcome.

Specifications:

Litron Lasers
He-Ne Laser-632nm
The sample (1 mm×1 – 10 mm×1 – 10 mm) should be flat with a polished surface.

Laser Shock Peening Setup

A process of materials that induces residual compressive stresses on the
surface of a component due to shock waves produced by plasma'. Laser
peening (LP), or laser shock peening (LSP), is a surface engineering
process used to impart beneficial residual stresses in materials. Laser
peening uses the dynamic mechanical effects of a shock wave imparted
by a laser to modify the surface of a target material. Fundamentally, laser
peening can be accomplished with only two components: a transparent
overlay and a high-energy pulsed laser system. The deep, high-magnitude
compressive residual stresses induced by laser peening increase the
resistance of materials to surface-related failures, such as fatigue, fretting fatigue, and stress corrosion
cracking.

Specifications:
Litron Lasers
Nd-YAG Laser
Energy - 400 mJ
Laser Wavelength - 1064nm
Pulsed duration - 6ns
Sample: Metal/metal alloy (1mm thick × 5 – 20 mm width × 5 – 20 mm length) with a flat surface.

CFM Newsletter Jan. – Dec. 2021 32 Issue – 1