Abstract
A continuous single-frequency tunable blue laser at 447.3 nm is developed by external-cavity frequency doubling of a tapered amplifier-boosted continuous-wave diode laser at cesium (Cs) D1 line. A maximum blue power of 178 mW with 50.8% conversion efficiency is obtained. It can be continuously tuned over a range around 1.6 GHz as the diode laser frequency is scanned across the F=4→F'=3 transition of 133Cs D1 line. The generated tunable and stable blue laser source has potential applications in constructing quantum light-atom interfaces in quantum networks.
Highlights
Single-frequency tunable lasers are key resources for the applications of optical spectroscopy, metrology, recording, atom manipulation, and quantum networks due to their continuous frequency sweeping across the range of interest [1,2,3]
The tunable laser at shorter visible wavelength can be obtained for special atomic excitations, e.g., 532 nm laser for Iodine (127I2) hyperfine luminescence [4], 656 nm laser at the radiative transition 2S1/2 ↔ 2D5/2 of Silver (Ag) atoms [5], 671 nm lasers scanned across the absorption spectrum of 22 S1/2 ↔ 2 2P1/2,3/2 on D1 and D2 lines of Lithium (Li) atoms [6,7], and 399nm laser for the 1S0 ↔ 1P1 excitation of Ytterbium (Yb) atoms [8]
The atom-light interface with alkali atoms and non-classical light is the key part of quantum networks, in which the laser frequency needs to be precisely tuned to match the atomic transition, e.g., the squeezed light locked at 852 nm of Cs D2 line [14] or 795 nm of rubidium (Rb) D1 line [15,16,17] via frequency doubling and parametric down conversion
Summary
Single-frequency tunable lasers are key resources for the applications of optical spectroscopy, metrology, recording, atom manipulation, and quantum networks due to their continuous frequency sweeping across the range of interest [1,2,3]. The atom-light interface with alkali atoms and non-classical light is the key part of quantum networks, in which the laser frequency needs to be precisely tuned to match the atomic transition, e.g., the squeezed light locked at 852 nm of Cs D2 line [14] or 795 nm of rubidium (Rb) D1 line [15,16,17] via frequency doubling and parametric down conversion These non-classical light resources have important applications in atomic spin squeezing [18], atomic entanglement generation [19], spectroscopy measurement [20] and quantum memory [21]
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