【摘 要】
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We propose a novel scheme to accurately determine the hundred-hertz linewidth using the delayed self-heterodyne method,in which the delay time is far less than
【机 构】
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School of Physics, Beijing Institute of Technology, Beijing 100081
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We propose a novel scheme to accurately determine the hundred-hertz linewidth using the delayed self-heterodyne method,in which the delay time is far less than the coherence time of the laser.This exceeds the former understanding of the delayed self-heterodyne technique,which requires a prohibitively long fiber.The selfheterodyne autocorrelation function and power spectrum are evaluated,and by numerical analysis we ensure that -3 dB of the power spectrum is applied to the self-heterodyne linewidth measurements.For a laser linewidth of less than 100Hz,the linewidth can be measured directly by a 10 km fiber,and in a more general case,the linewidth can be deduced from-20 dB or-40 dB of the fitting Lorentzian curve.
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