LIDT Scaling Calculator

Scale laser-induced damage threshold values between test and application conditions, calculate operating fluence, and verify safety margins.

Test Conditions

Published LIDT?

Test Wavelength (\u03bb\u2081)

Test Pulse Duration (\u03c4\u2081)

Test Beam Diameter (\u2300\u2081)

Application Conditions

Application Wavelength (\u03bb\u2082)

Application Pulse Duration (\u03c4\u2082)

Application Beam Diameter (\u2300\u2082)

Fluence Check

Pulse Energy

Beam 1/e\u00b2 Diameter at Optic

Beam Profile

Safety Factor

Scaling Factors

Wavelength factor (\u03bb\u2082/\u03bb\u2081)

0.5000\u00d7

Pulse duration factor \u221a(\u03c4\u2082/\u03c4\u2081)

0.7071\u00d7

Beam diameter factor (\u2300\u2081/\u2300\u2082)\u00b2

0.0711\u00d7

Scaled LIDT

LIDT at application conditions

0.2514J/cm\u00b2

Derated LIDT (with safety factor)

0.0838J/cm\u00b2

Safety Assessment

Operating peak fluence (Gaussian)

0.3537J/cm\u00b2

Safety margin

0.2370\u00d7

FAIL — operating above derated LIDT

Note: Pulsed LIDT scaling uses √τ and is valid only for nanosecond/microsecond pulses (roughly 1 ns to 100 ns). Do not apply to sub-nanosecond (ultrafast) pulses. Beam diameter scaling is approximate and may overestimate the reduction for beams larger than ~5 mm.

Abridged Optics — LIDT Scaling Calculator v2.0LIDT\u2082 \u2248 LIDT\u2081 \u00d7 (\u03bb\u2082/\u03bb\u2081) \u00d7 \u221a(\u03c4\u2082/\u03c4\u2081) \u00d7 (\u2300\u2081/\u2300\u2082)\u00b2