研究目的
Investigating the generation and characterization of phase-stable sub-single-cycle pulses at 3000 cm?1 through laser filamentation and four-wave difference frequency generation.
研究成果
Ultrabroadband coherent IR spectrum covering the entire IR region was generated through two-color filamentation. The waveform of the IR pulse was measured, showing a duration of 6.9 fs, corresponding to nearly half cycles of 3000 cm?1 carrier frequency. The CEP of the IR pulse was passively stabilized, with an instability of 154 mrad rms over 2.5 h. The study provides insights into the CEP control of sub-single-cycle pulses and suggests potential for future applications in high harmonic generation with longer wavelength input pulses.
研究不足
The intensity of the sub-single-cycle pulse generated by the scheme is still not enough to generate extreme ultraviolet attosecond pulses. The beam profile of the generated IR pulse is unsuitable for high field physics studies without further improvement.
1：Experimental Design and Method Selection:
The experiment involved focusing the fundamental and second harmonic of a 30-fs Ti:sapphire amplifier output into nitrogen gas to produce phase-stable broadband IR pulses through four-wave difference frequency generation.
2：Sample Selection and Data Sources:
Nitrogen gas at around atmospheric pressure was used as the medium for filamentation and IR pulse generation.
3：List of Experimental Equipment and Materials:
A Ti:sapphire multi-pass amplifier system, BBO crystal for second harmonic generation, delay plate, dual wave plate, concave mirrors, and a pyroelectric detector were used.
4：Experimental Procedures and Operational Workflow:
The fundamental and SH pulses were adjusted in delay and polarization before focusing into nitrogen gas. The generated IR pulses were characterized using frequency-resolved optical gating.
5：Data Analysis Methods:
The spectral and temporal properties of the IR pulses were analyzed using chirped-pulse upconversion and FROG-CEP techniques.
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