fs Laser Optics optimized for Third Order Dispersion

Silver Mirrors optimized for Femtosecond Applications

This very special type of optical coatings can be used to compensate the third order dispersion which results from laser crystals, substrates or dispersive elements as prisms or gratings. Positive as well as negative TOD can be achieved with this type of coatings. All coatings are optimized for nearly constant TOD which means TOD oscillations in the order of some hundreds of fs3. Please note that without TOD optimization these oscillations are in the order of some thousands of fs3. Recently, broadband mirror pairs with low average TOD were developed (see fig. 4). If low TOD over an extremely broad wavelength range is required we recommend to use optimized silver mirrors (see fig. 5).

Mirrors optimized for Negative or Positive Third Order Dispersion

Mirrors for fs-Lasers
Mirrors for fs-Lasers
  • Centre wavelength and amount of TOD according to customer specifications
  • In the wavelength range of the Ti:Sapphire laser the bandwidth of single mirrors with optimized TOD is limited to about 150nm

Mirror Pairs with optimized Third Order Dispersion

Mirrors for fs-Lasers
Mirrors for fs-Lasers

Mirror pairs show very smooth GDD and TOD spectra, although the corresponding spectra of the single mirrors exhibit strong oscillations. Recently broadband low TOD mirror pairs (e.g. for a bandwidth of 400nm, see fig. 4) were developed.

Optimized Silver Mirrors for use as Low TOD Components

Mirrors for fs-Lasers