Page 43 - CFM_Newsletter_CY22

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
2
The sample (1×1 mm – 10×10 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. 2022 43 Vol – 2