Abstract
We demonstrate high gain amplification of 160-femtosecond pulses in a compact double-pass cryogenic Ti:sapphire amplifier. The setup involves a negative GVD mirrors recompression stage, and operates with a repetition rate between 0.2 and 4 MHz with a continuous pump laser. Amplification factors as high as 17 and 320 nJ Fourier-limited pulses are obtained at a 800 kHz repetition rate.
Highlights
High-energy femtosecond pulses are essential for many applications in biophysics, chemical spectroscopy, nonlinear optics and high-energy physics[1]
We demonstrate high gain amplification of 160-femtosecond pulses in a compact double-pass cryogenic Ti:sapphire amplifier
We expect that much higher output powers and gains should be easy to reach by tuning the wavelength of the input pulses closer to the peak of the Ti:sapphire gain profile[15]
Summary
High-energy femtosecond pulses are essential for many applications in biophysics, chemical spectroscopy, nonlinear optics and high-energy physics[1]. Multi-pass or chirped-pulse regenerative amplifiers are commonly used, with repetition rates in the kHz range with pulsed pumping [4, 5, 6, 7, 8, 9, 10, 11]. Continuous pumping allows to reach higher repetition rates, and for instance Norris demonstrated fs-pulses amplification using Ti:sapphire with a cw regenerative amplifier at 250 kHz[12]. A simpler, double-pass amplifier was reported by Liu et al.[13, 14], at a much higher repetition rate (88 MHz). Huber et al demonstrated efficient amplification between 10 kHz and 4 MHz, in a double-pass geometry using an adaptative prism recompression stage[15]
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