Abstract
Generation of sub-150-fs-level pulses has been obtained from an Yb-doped crystal-based regenerative amplifier by applying an innovative amplification scheme. This scheme is based on optimization of the linear and non-linear phase during the amplification process inside the regenerative amplifier cavity. This technique with Yb:KYW allows to achieve pulse durations from diode-pumped Yb-doped regenerative amplifiers that were up to now only accessible with more complex Ti:sapphire amplifiers. With this Yb-doped tungstate crystal used in regenerative amplifiers, 145 fs pulses centered at 1026 nm with a spectral bandwidth of 14 nm at 50 kHz for an average power of 1.6 W have been generated.
Highlights
Significant progress has been made during the recent years in the development of diodepumped femtosecond lasers based on Yb:KY(WO4)2 crystal (Yb)-doped materials
Generation of sub-150-fs-level pulses has been obtained from an Yb-doped crystal-based regenerative amplifier by applying an innovative amplification scheme
This scheme is based on optimization of the linear and non-linear phase during the amplification process inside the regenerative amplifier cavity
Summary
Significant progress has been made during the recent years in the development of diodepumped femtosecond lasers based on Yb-doped materials. Typical femtosecond CPA systems use ultrashort pulses from the laser oscillator that are strongly temporally stretched in a positive dispersion pulse stretcher prior to amplification. This approach has enabled pulse amplification over several orders of magnitude without suffering from nonlinear effects or damage of optical components. Research has been carried out to resolve this problem by enhancing the effective gain bandwidth with combination of gain media with separated gain maxima and overlapping broadband gain, allowing the generation of 180-fs-level pulses [8,9] Another solution consists to use nonlinear effects [10,11] providing limited pulse duration to 250-500fs. They can be used in regenerative amplifier to generate short pulses while maintaining good temporal quality
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