研究目的
To propose a new method for measuring the intensity noise and phase noise of lasers utilizing the natural drift of the interferometer's working point.
研究成果
The proposed method effectively measures the phase noise and intensity noise of lasers by utilizing the natural drift of the interferometer's working point. It is simple and does not require phase tracking, providing a direct way to identify the main noise source in the system.
研究不足
The accuracy of the test results may be influenced by the difficulty in precisely grasping the working point and the presence of other noise sources such as thermal noise, dark current noise, and shot noise.
1：Experimental Design and Method Selection:
Utilizes a non-equilibrium optical fiber Michelson interferometer composed of a 2*2 fiber coupler, delay fiber, and two Faraday rotating mirrors (FRMs). The differential amplified signal of PD1 and PD2 is collected by the B&K Pulse system with a 24 bits ADC and processed by a computer for time domain and frequency domain analysis.
2：Sample Selection and Data Sources:
The first tested laser is a self-developed ring cavity fiber laser (RCFL), and the second is a RIO 1KHz linewidth semiconductor laser.
3：List of Experimental Equipment and Materials:
Non-equilibrium optical fiber Michelson interferometer, B&K Pulse system, 24 bits ADC, computer, RCFL, RIO semiconductor laser.
4：Experimental Procedures and Operational Workflow:
The natural drift of the interferometer's working point is used to measure the intensity noise and phase noise. The output signals are analyzed in time and frequency domains to identify noise characteristics.
5：Data Analysis Methods:
The differential result of the output signals is analyzed to separate intensity noise and phase noise contributions.
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