Single-frequency tunable 4473 nm laser by frequency doubling of tapered amplified diode laser at cesium D1 line

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.

High-efficiency generation of a low-noise laser at 447 nm

“…Which meet the requirement of the pump field of OPA for generating squeezed light or In summary, we demonstrate a high-efficiency generation of the low-noise 447 nm laser by frequency doubling of the Ti:sapphire laser in an external ring cavity with PPKTP crystal. Compared to previous work, 34) the thermal effect can be reduced by employing a bow-tie-type ring cavity instead of a standing-wave cavity, and the high-efficiency conversion with stable out power can be obtained. We obtain the maximum SHG power of 308 mW and the corresponding conversion efficiency of 70%, when the power of incident fundamental wave is 440 mW.…”

“…Thus the better output power and conversion efficiency can be obtained, compared to the case in the standing-wave cavity. 34) The inserts are the cavity resonant signal of infrared and blue lasers with the optimal phase-matching temperature at the input power of 440 mW. It can be seen that for the 447 nm laser, the thermal effect of PPKTP crystal in ring cavity and its induced bi-stability-like phenomenon are not very severe.…”

“…33) So far, a tunable 178 mW laser at 447 nm has been generated by frequency doubling of a tapered amplifier boosted diode laser system which reaches QNL at frequencies above 18 MHz. 34) However, the generation of higher power blue laser with low noise in MHz frequency range still remains demanding for quantum metrology and quantum network.…”

382 mW External-Cavity Frequency Doubling 461 nm Laser Based on Quasi-Phase Matching

“…However, they have not shared the material making up the SHG crystal. With the development of quasi-phase matching technology, periodically poled KTiOPO 4 (PPKTP) crystals have been widely used in blue light frequency doubling technology due to its advantages of high nonlinear coefficient and high damage threshold [38][39][40][41][42]. In 2003, Schwedes et al of the Max Planck Institute of Quantum Optics in Germany, using a 20 mm long PPKTP crystal, created a 461 nm laser with an output power of 205 mW and a conversion efficiency of 40% [43].…”

Ultra-compact all-fiber narrow-linewidth single-frequency blue laser at 489 nm

“…Compact and efficient laser sources in the blue/green spectral range have stimulated wide interest within the scientific community and engineering practices due to their important applications including underwater communication, optical data storage, color displays, medical diagnostics, and coherent ultraviolet light generation [1][2][3][4]. Especially, low noise single-frequency blue laser with a kHz linewidth is strongly required for the scientific applications including high-resolution atomic/molecular spectroscopy, quantum optics and atom cooling/trapping [5][6][7].…”