![]() The laser source employed here is a home-made 852 nm Faraday laser, 36,37 which has two working modes, single- and dual-frequency, and the laser frequency corresponds to the cesium atomic Doppler broadened line, making it easy to be tuned to the atomic transition region. In this Letter, we demonstrate a frequency-stabilized Faraday laser with 10 –14 short-term instability. 36,37,40 Although significant progress has been achieved in the study of the Faraday laser, 41 in the recent ten years, stabilizing the Faraday laser instead of the traditional external cavity diode laser with atomic spectroscopy has never been realized. 35 Aside from that, recently, our group presented a Faraday laser system operating on the Cs 852 nm transition, which can work at single- and dual-frequency modes and applied it to the optical communication system. ![]() realized a single-mode 780 nm Faraday laser and used standard lock-in techniques to lock the cavity to the peak transmission of the Faraday filter, which shows a frequency stability of 10 −9 level. After decades of development and improvement in this type of laser, until recently, it was formally named the “Faraday laser.” 33–35,39 In 2016, Keaveney et al. 31–38 Using a Faraday filter as the frequency selective element, the laser frequency is limited to the atomic Doppler broadened line and is robust to the changes in laser diode's current and temperature. Since the Faraday filter was reported in 1956, 30 it has been used as a laser frequency selective element. The laser frequency can be stabilized by atomic spectroscopy, but the requirements are less stringent and the servo is more robust when starting with an inherently stable laser source. Nevertheless, laser frequency stabilization using various atomic spectroscopies, such as saturation absorption spectroscopy (SAS), 14–16 modulation transfer spectroscopy (MTS), 17–22 polarization spectroscopy (PS), 23 dichroic atomic vapor laser lock (DAVLL), 24,25 and dual- or multi-mode laser spectroscopy, 26–29 have the advantages of more compact and insensitive to the environment compared with the PDH stabilization scheme. 9–13 However, its high cost and large size limit some of the applications. In order to stabilize the laser frequency and realize the ultra-stable laser, the well-known laser frequency stabilization by using a high-finesse F–P cavity with the Pound–Drever–Hall (PDH) technique has been studied constantly since it was reported several decades ago. 7,8 Although the above external cavity diode lasers can produce excellent single mode output, they are very susceptible to vibration and cannot provide good long-term stability because they do not have an absolute reference. 1 There are several techniques for tuning the laser frequencies to arbitrary frequencies of interest within the laser gain curves, and traditional methods utilizing frequency selective elements in the feedback path have been devised such as external cavities with Fabry–Pérot etalons, 2,3 gratings, 4–6 and interference filters. ![]() High-stability diode laser systems are widely used in the field of atomic clocks, which are often required to be tuned to specific atomic resonances.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |