Abstract

We introduce a Fabry–Perot cavity-length modulation technique for measuring the linewidth of a continuous wave (cw) laser. We calculate the peak intensity of a cw laser transmitted through a Fabry–Perot cavity as a function of mirror speed. By fitting the experimental data to the results of the calculation, we determine the linewidth of a frequency-stabilized cw laser. The linewidth of a cw ring dye laser measured in the 570–590-nm wavelength range is ∼170 ± 20 kHz. We also demonstrate the use of this technique to measure the reflectivity of a high-reflectance mirror.

© 1999 Optical Society of America

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