Abstract
This study demonstrates 578 nm yellow light generation with a narrow linewidth using a waveguide periodically poled lithium niboate (PPLN) and an optical injection-locked diode laser. The frequency of an external cavity diode laser used as a master laser operating at 1156 nm in optical injection-locking mode was locked into a high-finesse cavity with the Pound-Drever-Hall technique, which results in a linewidth reduction of the master laser. The linewidth of the master laser was estimated to be approximately 1.6 kHz. In an effort to amplify the optical power, a distributed feed-back laser was phase-locked to the master laser by an optical injection-locking technique. A waveguide PPLN was used for second harmonic generation. Frequency-doubled yellow light of approximately 2.4 mW was obtained with a conversion efficiency of 6.5%.
Highlights
There has been a specific need for yellow light in the field of optical frequency metrology [1,2,3]
This study demonstrates 578 nm yellow light generation with a narrow linewidth using a waveguide periodically poled lithium niboate (PPLN) and an optical injection-locked diode laser
The frequency of an external cavity diode laser used as a master laser operating at 1156 nm in optical injection-locking mode was locked into a high-finesse cavity with the Pound-Drever-Hall technique, which results in a linewidth reduction of the master laser
Summary
There has been a specific need for yellow light in the field of optical frequency metrology [1,2,3]. The motional state of ultra-cold Yb atoms are squeezed into a motional state in a specially designed optical lattice to provide surroundings optimized for measuring the center frequency of the transition with a fractional uncertainty of less than 10−16 [4] In this type of high-resolution spectroscopy, a yellow light laser near 578 nm with an ultra-narrow linewidth and high stability is essential. The optical clock transition line of lattice-based Yb atoms was probed with a 578 nm-yellow light laser via SFG [23,24,25] This method has value in that there are many sets of available combinations of frequencies of well-developed high-power solid-state lasers, including Nd:YAG lasers, diode lasers and fiber lasers. As this system uses the well-developed Nd:YAG laser system with a 1 kHz linewidth and a high level of power, the narrowing of the linewidth and the generation of sufficient power for precision spectroscopy are achieved
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