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학술지 Spectrally Combined Three-diode-pumped Compact Femtosecond Ti:sapphire Laser Exceeding 1 W Mode-locked power
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송동훈, 서홍석
Optics Express, v.20 no.27, pp.32649-32657
Optical Society of America (OSA)
The achievement of a high average power exceeding 1 W remains a major challenge for direct-diode pumped and mode-locked femtosecond Ti:sapphire lasers. Herein, we demonstrate high-power soliton-like pulses from a direct spectrally combined three-diode-pumped and semiconductor saturable absorber mirror (SESAM)-based mode-locked Ti:sapphire laser. Its mode-locked output power of up to 1 W was obtained in correspondence with a 68.8 MHz repetition rate and 55 fs pulse duration; thus, the pulse energy and peak power are 14.5 nJ and 264 kW, respectively. To the best of our knowledge, this is the highest reported output power and pulse energy from a Ti:sapphire laser with three spectrally combined pump diodes (471 nm, 491 nm, and 525 nm) and a simple beam expander. For efficient pumping, the combined pump beam, directed into the lens (f = 60 mm), which comprised three aspheric lenses along the fast axis and a shared cylindrical beam telescope (8× magnification) along the slow axis, resulting in a circular-focused beam in the Ti:sapphire crystal. The beam waist was measured to be 39 쨉m ×38 쨉m along the slow and fast axes.
KSP 제안 키워드
525 nm, Beam waist, Diode pumped, High average power, High power, Mode-locked, Output power, Peak power, Pulse duration, Pulse energy, Repetition rate