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  • 1
    Electronic Resource
    Electronic Resource
    Negative dispersion mirrors for dispersion control in femtosecond lasers: chirped dielectric mirrors and multi-cavity Gires–Tournois interferometers (2000)
    Springer
    Applied physics 70 (2000), S. S51 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.15.Eq; 42.25.Bs; 42.40Pa; 42.60.Da; 42.65.k; 42.79Bh; 42.90.V
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Chirped dielectric laser mirrors have been known for years as useful devices for broadband feedback and dispersion control in femtosecond pulse lasers. First we present a novel design technique referred to as frequency domain synthesis of chirped mirrors. These mirrors exhibit high reflectivity and nearly constant group delay over 150 THz supporting generation of sub-5-fs pulses in the visible. Afterwards, multi-cavity thin-film Gires–Tournois interferometers are introduced for the first time as an alternative approach to realize “negative dispersion mirrors”. These novel dielectric high reflectors exhibit reflectivities R〉99.97% and a negative group delay dispersion of −50±1 fs2 over a bandwidth of 56 THz. Dispersive properties originate from coupled resonances in multiple λ/2 cavities embedded in the layer structure. The general structure and performance of multi-cavity Gires–Tournois interferometers are compared to that of chirped dielectic mirrors and their distinct applications are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400000303
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Spectral filtering of femtosecond laser pulses by interference filters (2000)
    Springer
    Applied physics 70 (2000), S. S63 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 45.15.Eq; 42.25.Bs; 42.40.Pa; 42.60.Da; 42.65k; 42.79.Bh; 42.90.V
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Phase properties of optical thin film interference filters are discussed from the aspect of their usage for phase-error free wavelength separation of broadband femtosecond laser pulses. It is shown that both transmissive or reflective interference filters with high contrast ratios exhibit high cubic phase shifts on transmission or reflection, respectively, causing intolerable distortion in the temporal pulse shape. We show, however, that high efficiency wavelength separation of broadband femtosecond laser pulses can be achieved by using low contrast, properly designed reflective optical interference filters directly built into the cavity of the broad spectrum, femtosecond pulse lasers or parametric oscillators. For demonstrative purposes, we implemented the idea for a Kerr-lens mode-locked Ti:sapphire laser, and obtained two-color, inherently synchronized, unchirped, femtosecond pulse outputs from a single laser oscillator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400000366
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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