High-dispersion mirrors (HD)

High-dispersion mirrors can substitute a prism compressor. This unprecedented combination of high dispersion and low loss over a sizeable bandwidth with multilayer structures opens the prospects for femtosecond CPA systems equipped with a compact, alignment-insensitive all-mirror compressors providing compensation of GDD as well as higher-order dispersion. HD has many distinct advantages:

  • makes the laser system more compact,
  • increases throughput,
  • improves temporal stability, and
  • enables shorter output pulses.

Hundreds of kHz-rate Ti:sapphire femtosecond CPA lasers are in use all over the world. Their operation relies on the stretching and recompressing of pulses before and after amplification. Currently, complex, rather lossy and alignment-sensitive optical systems based on prisms and/or diffraction gratings are employed for this purpose. HD mirrors demonstrate that the required dispersion up to orders of 10,000 fs2 can be introduced by a set of high-dispersive multilayer dielectric mirrors. This has been demonstrated by employing the HD mirror technology in µJ-level femtosecond Yb:YAG laser oscillators.

Customers have been able to reach the Fourier-limit for 19 fs output pulses by replacing the prism compressor with highly-dispersive mirrors. The maximum nominal dispersion is inversely proportional to the mirror bandwidth.

Please browse UFI’s design database for the following examples:

HD16, HD30

Furthermore, a variety of mirrors are available for pulse compression of Yb-based laser systems. By compensating the dispersion of microscope objectives in biophotonics applications, highly dispersive mirrors help to deliver femtosecond pulses on target. We would be happy to consult with you to design a highly-dispersive mirror for your intra-cavity or external pulse compression application. Our pulse analysis tools help to find the optimum dispersion distribution per reflection.

Please browse UFI’s design database for the following examples:

HD64, HD73

Apart from applications at around 800 and 1030 nm wavelength, UltraFast Innovations can supply highly dispersive mirrors for virtually any part of the optical spectrum with desired bandwidth. Such mirrors in the IR range allow to compress the output of a broadband IR OPA system. All mirror compression solutions are also available as dedicated, fully characterized mirror compression units within a compact housing.

Please browse UFI’s design database for the following examples:

HD40, HD58, D59, HD90, IR15

Applications

Cavity mirrors in high-energy femtosecond oscillators:
  • Femtosecond pulse compression
  • Compensation of microscope objectives
  • Chirped-pulse oscillators
  • Thin-disk oscillators
  • All mirror compression solutions are also available as dedicated, fully characterized mirror compression units within a compact housing.

Related Reading

  • V. Pervak et al. Opt. Express 17 19204 (2009)
  • P. Dombi et al. Optics Express 17, 20598 (2009)
  • O. Pronin et al. Op. Lett. 36, 4746 (2011)
  • O. Pronin et al. Opt. Lett. 37, 3543 (2012)
  • V. Pervak et al. Opt. Express, 20, 4503 (2012)
  • S. Naumov et al. New J. Physics 7 216 (2005)
  • V. Pervak et al. Opt. Express 16 10220 (2008)

Please contact us for further information and references.