Sill Technical Guide

Laser Optics

Formulary

→ Formulary

> 1. Fokussing lenses

   > 1.1 Calculation of the minimum focal diameter

   > 1.2 Calculation of the rayleigh length

   > 1.3 Calculation of the focal diameter for fiber imaging

> 2. Laser Induced Damage Threshold (LIDT)

   > 2.1 Energy- and power density

   > 2.2 Estimate of the LIDT

> 3. Beam expanders

   > 3.1 Calculation of the magnification

   > 3.2 Divergence angle

General explanations

→ General explanations

> Part number

> Datasheets, technical drawings and CAD-files 

> Anti-reflective and low-absorption coatings

> Design wavelength

> Absorption and thermal focus shift

> Working distance

> Diffraction value M²

> Reversed Mode

> Beam diameter

> Apodisation factor

> Spot size (1/e²)

> Rayleigh length

> Fiber imaging

Laser inducted damage threshold (LIDT)

→ Laser inducted damage threshold (LIDT)

> General description

> Energy density / Fluence

> Power density / Irradiance

> Dependencies of LIDT

      > Wavelength

      > Pulse duration τ

      > Pulse repetition rate

      > Laser beam size (diameter or area)

      > Pulse shape

      > Quick reference formula

> Destruction mechanisms

> LIDT of our coatings

F-theta lenses

→ F-theta lenses

> General explanations

>Lens type recommendation

      > Internal ghosts

      > External ghosts

      > Fused Silica with low-absorption coating

      > Spot expansion for applications with USP lasers

> Optical and mechanical scan angle

> Aperture stop and mirror distances

> Change of the scan lens position

> Spot diameter diagram

> Telecentricity

> Black Box files for  Zemax OpticStudio®

Beam expanders

→ Beam expanders

> General explanations

> Structure

> Selection

> Divergence adjustment

> Zoombeam expanders

> Holding and positioning

Asphere design

→ Asphere design

> Mathematical description

> Technological possibilities

> Guideline for asphere design

     > Prelimary considerations

     > Limitations of local surface curvature

     > Aspherical parameters

     > Edge thickness and oversize

     > Tolerancing via slope error

Trapped Ion lenses

→ Trapped Ion lenses