研究目的
Investigating the influence of the Doppler effect on the carrier-envelope phase (CEP) of ultrashort laser pulses and demonstrating a novel method for CEP stabilization that avoids the side effects of traditional feedback and feed-forward control methods.
研究成果
The Doppler effect provides a novel method for CEP modulation that avoids the side effects of traditional stabilization schemes, offering scalability to higher frequencies and applicability to a wider range of mode-locked lasers. This opens avenues for third-generation CEP stabilization schemes that do not compromise power or beam pointing stability.
研究不足
The method's effectiveness is limited by the mechanical resonance frequencies of the acoustic actuator, with reduced modulation bandwidth and faint modulation observed beyond these frequencies. Scalability to higher frequencies requires further development of materials like ferroelectric or piezoelectric films.
1：Experimental Design and Method Selection:
The study employs a setup to measure the influence of the optical Doppler effect on the CEP of ultrashort Ti:sapphire laser pulses, using an in-loop f-2f interferometer for CEF locking and an out-of-loop interferometer with an acoustic actuator for measuring Doppler-induced CEF changes.
2：Sample Selection and Data Sources:
The experiment uses a Ti:sapphire laser and measures the radio frequency spectra of the Doppler-modulated CEF signal.
3：List of Experimental Equipment and Materials:
Includes a photonic crystal fiber (PCF), beam splitter (BS), low-band pass filter (LPF), avalanche photodiode (APD), RF input (R), local oscillator input (L), intermediate frequency output (I), signal amplifier (SA), signal generator (SG), digital sampling oscilloscope (DSO), and an electro-dynamical exciter (EDE) with a small mirror.
4：Experimental Procedures and Operational Workflow:
The CEF of the laser is locked at 1 MHz, and the influence of Doppler-induced CEF changes is measured relative to the in-loop interferometer using an acoustic actuator.
5：Data Analysis Methods:
The frequency-modulated CEF-beat signal is simulated to compare with measured spectra, determining the modulation index by comparing the spectrum of the modulated CEP signal with simulation results.
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