研究目的
To demonstrate a novel laser frequency shift scheme using a 12-pass 350-MHz acousto-optic modulator (AOM) for better performance in laser cooling and coherent manipulation experiments with alkali metal atoms.
研究成果
The 12-pass AOM system demonstrates a significant improvement in frequency shift range and diffraction efficiency, achieving up to 5 GHz frequency shift with 11% total diffraction efficiency. This system is suitable for laser cooling and coherent manipulation experiments, offering better stability and scalability than traditional methods.
研究不足
The bandwidth of the multi-pass AOM system is limited by diffraction angle-based efficiency, and the system requires careful alignment to maintain high diffraction efficiency across all passes.
1：Experimental Design and Method Selection:
The study employs a 12-pass AOM system combining Faraday rotator–triangular prisms, polarization beam splitters (PBSs), and a 350-MHz AOM to achieve a frequency shift range up to 5 GHz. A 3-lens-collimation system is used to decrease laser beam divergence and improve diffraction efficiency.
2：Sample Selection and Data Sources:
A seed laser with a wavelength of 780 nm and output power of 90 mW is used, with part of the laser (30 mW) coupled and delivered via a polarization-maintaining fiber to the 12-pass AOM system.
3：List of Experimental Equipment and Materials:
Includes a 350-MHz AOM (MT350, AA optoelectronic), polarization beam splitters, Faraday rotators, triangular prisms, lenses, and mirrors.
4：Experimental Procedures and Operational Workflow:
The laser beam passes through the AOM 12 times, with each pass optimized for diffraction efficiency. The system's performance is tested by scanning the driving frequency and measuring output power and frequency stability.
5：Data Analysis Methods:
The total diffraction efficiency is calculated as the ratio of output to input laser power. Frequency stability is measured using a beat signal between input and output laser beams analyzed with an Agilent technologies N9030A analyzer.
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