Push Laser Pulse Toward Attosecond Duration, Locked Carrier Envelope Phase and XUV Range

Push laser pulse toward attosecond duration, locked carrier envelope phase and XUV range Zhiyi Wei, Hao Teng, Zhaohua Wang, Hainian Han Optical Physics Laboratory, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China *corresponding author: [email protected]

With the rapid development of femtosecond laser technology, laser pulse has been pushed to a duration of single cycle and the carrier-envelope phase (CEP) also been locked an accuracy of atomic clock. It opens the gates for frequency metrology and attosecond pulse generation. In this presentation, we will report the new progresses on femtosecond laser research at the Institute of Physics in Beijing. First, a series of 6~8fs laser pulses were directly generated from the Ti:sapphire lasers by controlling the dispersion with chirped mirrors, a MgO:PPLN crystal was used to generate the difference frequency laser for CEP measurement. Based on this work we realized the waveform control with a monolithic scheme. Second, we successfully compressed the laser pulse from a CPA Ti:sapphire laser at 1kHz repetition rate to 5.1fs with energy of 0.4mJ by injecting a CEP controlled 7fs laser as the seeding, the fluctuation of CEP within 53mrad was demonstrated by the combination of spectra- interference technology and slow loop electronics, which proven a technology to finely control the waveform. Third, by focusing the CEP controlled 5fs laser into the flow Ne gas, we measured continuous high order harmonic with cut off wavelength to 7 nm, which indicates a feasible way to single attosecond laser generation.