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The beat frequencies of Lorentz fitting curves for linewidth at (a) different currents. (b) Rafter-fitting the data in (a). The resulting linewidths are 77.8 kHz, 78.65 kHz, and 80.25 kHz at I2 = 1.5 A, 2.0 A, and 2.5 A. (c) The linewidths at different temperatures are 77.8 kHz, 78.65 kHz, and 80.25 kHz at 15 °C, 20 °C, 25 °C, 30 °C, and 35 °C.
