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Schematic of ARLD external-cavity laser. Laser transmits through FADOF, is fed backed by a highly reflecting mirror, and outputs at the half-reflecting mirror. The reflectance of highly reflecting mirror is .
Fluorescence spectrum of ARLD without external feedback (the temperature and current of the ARLD are 21.24 °C and 78.93 mA).
(a) is the transmission spectrum of Rb FADOF and the fluorescence spectrum of Rb cell (the temperature and magnetic field of FADOF is 70 °C and 3.2 × 10−2 T. In the Rb cell, T = 24 °C and B = 0 T) and external-cavity longitudinal modes with interval of 379.7 MHz. The FWHM of the highest peak of Rb FADOF transmission spectrum is 1.3 GHz. (b) is temperature-wavelength curve, while current is kept at 74.04 mA. (c) is current-wavelength curves, while temperature is kept at 21.31 °C. Comparing (a) with (b) and (c) transversely, it shows that the wavelength of laser is well kept within the highest transmission peak.
Mode of the laser as measured by a Fabry-Perot interferometer. The free spectral range of the Fabry-Perot interferometer is 20 GHz.
Beat signal between two identical ARLD external-cavity lasers together with its Gaussian and Lorentzian fits. The measurement duration of spectrum analyzer is 50 ms, the resolution bandwidth is 30 kHz, and the video bandwidth is 3 kHz. The FWHM of Gaussian fits is 97 kHz and that of Lorentzian fits is 90 kHz.
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