State Key Laboratory of Advanced Optical Communication System and Network, Institute of Quantum Electronics, School of Electronics Engineering and Computer Science, Peking University, Beijing, 100871, China.
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, 100876, China.
Sci Rep. 2017 Aug 21;7(1):8995. doi: 10.1038/s41598-017-09501-w.
We present the design and performance characterization of a Faraday laser directly lasing on the Rb 1529 nm transition (Rb, 5P - 4D ) with high stability, narrow spectral linewidth and low cost. This system does not need an additional frequency-stabilized pump laser as a prerequisite to preparing Rb atom from 5S to 5P excited state. Just by using a performance-improved electrodeless discharge lamp-based excited-state Faraday anomalous dispersion optical filter (LESFADOF), we realized a heterogeneously Faraday laser with the frequency corresponding to atomic transition, working stably over a range of laser diode (LD) current from 85 mA to 171 mA and the LD temperature from 11 °C to 32 °C, as well as the 24-hour long-term frequency fluctuation range of no more than 600 MHz. Both the laser linewidth and relative intensity noisy (RIN) are measured. The Faraday laser lasing on Rb 1529 nm transition (telecom C-band) can be applied to further research on metrology, microwave photonics and optical communication systems. Besides, since the transitions correspongding to the populated excited-states of alkali atoms within lamp are extraordinarily rich, this scheme can increase the flexibility for choosing proper wavelengths for Faraday laser and greatly expand the coverage of wavelength corresponding to atomic transmission for laser frequency stabilization.
我们提出了一种基于铷原子 1529nm 跃迁（Rb，5P-4D）的远红外激光设计与性能特点，该激光具有高稳定性、窄线宽和低成本等优点。该系统不需要额外的频率稳定泵浦激光作为将铷原子从 5S 激发到 5P 激发态的前提条件。仅使用改进后的无电极放电灯基激发态法拉第反常色散光学滤波器（LESFADOF），我们就实现了一个与原子跃迁频率对应的非均匀法拉第激光器，其在激光二极管（LD）电流从 85mA 到 171mA 以及 LD 温度从 11°C 到 32°C 的范围内稳定工作，并且 24 小时的长期频率波动范围不超过 600MHz。我们测量了激光线宽和相对强度噪声（RIN）。铷 1529nm 跃迁（电信 C 波段）的远红外激光可以应用于计量学、微波光子学和光通信系统的进一步研究。此外，由于灯内的碱金属原子的激发态跃迁异常丰富，该方案可以增加选择适当波长的远红外激光的灵活性，并大大扩展激光频率稳定的原子传输波长的覆盖范围。
