研究目的
Investigating the control and stabilization of carrier-envelope phase (CEP) in high-repetition-rate, high-energy laser amplifiers to enable precise phase manipulation for applications in attosecond science.
研究成果
The combination of fast single-shot CEP measurement and a high-bandwidth actuator enables arbitrary carrier-envelope phase control with stability rivaling seed oscillators (98 mrad rms over 5x10^5 shots). This approach mitigates dispersion-related issues and opens new possibilities for preprogrammed CEP sequences and lock-in detection in ultrafast experiments.
研究不足
The system's performance is limited by the phase noise accumulated from the seed oscillator between pulses. The actuator's bandwidth, while high, may not cover all noise frequencies. The method relies on specific hardware (AOFS and fast spectrometer), which might not be universally applicable.
1：Experimental Design and Method Selection:
The experiment uses a feed-forward stabilized Ti:sapphire oscillator and a nine-pass amplifier with bulk stretcher and transmission grating compressor to generate 25 fs, 0.8 mJ pulses at 10 kHz. CEP is measured using a single-shot f-to-2f interferometer with on-the-fly phase processing. A novel actuator based on acoustic grating phase control in an acousto-optic frequency shifter (AOFS) is employed for high-bandwidth phase modulation.
2：8 mJ pulses at 10 kHz. CEP is measured using a single-shot f-to-2f interferometer with on-the-fly phase processing. A novel actuator based on acoustic grating phase control in an acousto-optic frequency shifter (AOFS) is employed for high-bandwidth phase modulation.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Laser pulses from the amplifier system are used as samples. Data is acquired from the fast spectrometer detecting interference spectra.
3：List of Experimental Equipment and Materials:
Ti:sapphire oscillator (rainbow CEP4, Femtolasers), nine-pass amplifier, bulk stretcher, transmission grating compressor, fast f-to-2f interferometer, fast CMOS detector (512 pixels), acousto-optic frequency shifter (AOFS), voltage-controlled RF phase shifter, proportional-integral filter.
4：Experimental Procedures and Operational Workflow:
Seed pulses from the oscillator are amplified. CEP is measured shot-by-shot using the fast spectrometer triggered synchronously with the amplifier. The AOFS actuator modulates the acoustic phase to control CEP. Open-loop tests involve applying square waves to the RF shifter for phase jumps. Closed-loop feedback uses the analog error signal processed by a PI filter and fed back to the RF phase shifter.
5：Data Analysis Methods:
CEP values are analyzed in time domain for step response and stability. Fourier transform is used for noise power spectral density and integrated phase noise calculation.
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