Article

Time-domain approach for designing dispersive mirrors based on the needle optimization technique. Theory.

Research Computing Center, Moscow State University, Leninskie Gory, 119992 Moscow, Russia.
Optics Express (Impact Factor: 3.53). 01/2009; 16(25):20637-47. DOI: 10.1364/OE.16.020637
Source: PubMed

ABSTRACT We combine powerful and well-proven needle-optimization technique with time-domain optimization approach in order to obtain a new efficient method of designing dispersive mirrors. We also propose a new optimization criterion targeted at reaching shortest possible pulses with maximum possible energy at the exit of a compressor containing such mirrors. Proposed optimization criterion includes two parameters allowing one to adjust the relative weights of the mentioned targets with a high flexibility. The obtained results are compared with solutions of the "classical" optimization approach based on the optimization of a merit function comparing theoretical reflectance and group delay dispersion with target ones. The new approach allows obtaining simpler solutions providing better characteristics of the output pulse.

0 Followers
 · 
70 Views
  • Source
  • [Show abstract] [Hide abstract]
    ABSTRACT: Design of high-dispersion mirrors (HDMs) using a proposed multi-swarm optimization method is reported. We design HDMs for Yb:YAG disk oscillator at 1030 nm and ultrashort pulse Cr:YAG laser at 1550 nm. The results show that the optimum group delay dispersion and reflectance can be obtained with optimal number of layers. The proposed optimization method has a fast convergence rate and powerful global search ability and can be utilized effectively for the design of a variety of optical thin film filters.
    Optik - International Journal for Light and Electron Optics 10/2014; 125(19). DOI:10.1016/j.ijleo.2014.07.043 · 0.77 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We report on two newly developed types of dispersive mirrors. First type covers range of 1027-1033 nm, has 99.9% reflectance and -4500 fs2 of group delay dispersion (GDD). When implementing these mirrors in Yb:YAG disk oscillator we observe changes on the surface of the mirrors due to thermal effects. Second type is high dispersive mirror (HDM) which provides GDD of -3000 fs2 and covers wavelength range of 1020-1035 nm. The fabricated mirrors have reflectance 99.97%. We haven't observed any thermal effects on the second type of HDM, it behaves similar to non-dispersive quarter wave stack mirrors. This HDM were successfully implemented in an Yb:YAG disk oscillator over 1 kW of intracavity circulated power. The reported mirrors expand possibilities of multilayer optics. The mentioned large GDD allows to compress the nanosecond pulses down to femtosecond range.
    Quantum Electronics Conference & Lasers and Electro-Optics (CLEO/IQEC/PACIFIC RIM), 2011; 01/2011