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  • 1
    Electronic Resource
    Electronic Resource
    Sensitive characterization of phase and amplitude semiconductor nonlinearities for broadband 20 fs excitation (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 1187-1189 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present an experimental technique that allows for the detection of pump-induced transmission and phase changes with high sensitivity and ultrafast temporal resolution over an arbitrarily wide time window. This is achieved combining spectral interferometry with high-frequency-chopping differential transmission measurements. With this setup, exciton and continuum nonlinearities in a semiconductor are studied for broadband excitation. We find that the pump-induced phase changes at the exciton and in the continuum decay on distinctly different time scales, indicating different microscopic origins. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373796
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  • 2
    Electronic Resource
    Electronic Resource
    Back-side-coated chirped mirrors with ultra-smooth broadband dispersion characteristics (2000)
    Springer
    Applied physics 71 (2000), S. 509-522 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.65.Re; 42.79.Bh; 42.79.Wc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We demonstrate a new technique for the design of chirped mirrors with extremely smooth dispersion characteristics over an extended ultra-broadband wavelength range. Our approach suppresses spectral dispersion oscillations, which can lead to unwanted strong spectral modulations and limit the bandwidth of mode-locked laser pulses. Dispersion oscillations are significantly reduced by coating the chirped mirror structure on the back side of a substrate, providing ideal impedance matching between coating and ambient medium. An anti-reflection coating may be added on the front side of the substrate, geometrically separated from the chirped mirror. The chirped mirror structure and the anti-reflection coating are non-interfering and can be independently designed and optimized. The separation of both coating sections provides a much better solution for the impedance-matching problems than previous approaches to chirped mirror design. We show by a theoretical analysis and numerical simulations that minimum dispersion oscillations are achieved if the index of the substrate is identical to the index of one of the coating materials and if double-chirping is used for the chirped mirror structure. Based on this analysis, we design a mirror that supports a bandwidth of 220 THz with group delay dispersion oscillations of about 2 fs2 (rms), an order-of magnitude improvement compared to previous designs of similar bandwidth. In a first experimental demonstration of back-side-coated (BASIC) mirrors, we achieve nearly transform-limited and virtually unchirped pulses of 5.8 fs duration from a Kerr-lens mode-locked Ti:sapphire laser. BASIC mirrors are particularly suited for higher-order dispersion compensation schemes. They support the extremely broad spectra of few-cycle pulses and promise to provide clean pulse shapes in this regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400000426
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  • 3
    Electronic Resource
    Electronic Resource
    Sub-6-fs pulses from a SESAM-assisted Kerr-lens modelocked Ti:sapphire laser: at the frontiers of ultrashort pulse generation (2000)
    Springer
    Applied physics 70 (2000), S. S5 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.55.Rz; 42.60.Fc; 42.65.Re; 42.79.Wc; 42.79.Bh; 85.30.De
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Well-characterized pulses in the two-optical-cycle regime are demonstrated using a Kerr-lens modelocked (KLM) Ti:sapphire laser and phase-sensitive diagnostics. The oscillator employs double-chirped mirrors (DCMs) for dispersion compensation, spectral shaping via wavelength-dependent output coupling, and a semiconductor saturable absorber mirror (SESAM) for reliable operation at up to 300 mW output power and with a repetition rate of ∼90 MHz.In the discussion of the experimental results we emphasize how spectral shaping can be used most efficiently in the generation of the shortest possible pulse supported by the Ti:sapphire gain bandwidth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400000308
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  • 4
    Electronic Resource
    Electronic Resource
    Techniques for the characterization of sub-10-fs optical pulses: a comparison (2000)
    Springer
    Applied physics 70 (2000), S. S67 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.65.Re; 42.60.Fc; 42.30.Rx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Several methods have been proposed for the phase and amplitude characterization of sub-10-fs pulses with nJ energies. An overview of these techniques is presented, with a focus on the comparison of second-harmonic generation frequency-resolved optical gating (SHG-FROG) and spectral phase interferometry for direct electric-field reconstruction (SPIDER). We describe a collinear FROG variant based on type-II phase-matching that completely avoids the geometrical blurring artifact and use both this and SPIDER for the characterization of sub-10-fs Ti:sapphire laser pulses. The results of both methods are compared in an extensive statistical analysis. From this first direct experimental comparison of FROG and SPIDER, guidelines for accurate measurements of sub-10-fs pulses are derived. We point out limitations of both methods for pulses in this ultrashort pulse regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400000307
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