In a hollow-core fiber(HCF),light propagates through an air/vacuum core rather than a solid material,resulting in a low thermo-optic coefficient and ability to handle high powers.Here,we demonstrate a laser locked to ...In a hollow-core fiber(HCF),light propagates through an air/vacuum core rather than a solid material,resulting in a low thermo-optic coefficient and ability to handle high powers.Here,we demonstrate a laser locked to a hollow-core fiber reference,which thanks to the low HCF thermal sensitivity,shows long-term stability an order of magnitude better than compact commercially available low-noise lasers.The laser frequency variation within±600 kHz was measured over 50 h.The stability of our proof-of-concept laser is ensured via a strong selfinjection ratio of-15 dB,enabled by the high-power handling and low loss of the hollow-core fiber's resonator.Moreover,our results show appealing performance parameters,including a fractional frequency stability of4×10^(-13)at 1 s averaging time and a Lorentzian component of the linewidth of 0.2 Hz.展开更多
基金Engineering and Physical Sciences Research Council(EP/P030181/1)VACUUM(EP/W037440/1)Technology Agency of the Czech Republic(FW03010171)。
文摘In a hollow-core fiber(HCF),light propagates through an air/vacuum core rather than a solid material,resulting in a low thermo-optic coefficient and ability to handle high powers.Here,we demonstrate a laser locked to a hollow-core fiber reference,which thanks to the low HCF thermal sensitivity,shows long-term stability an order of magnitude better than compact commercially available low-noise lasers.The laser frequency variation within±600 kHz was measured over 50 h.The stability of our proof-of-concept laser is ensured via a strong selfinjection ratio of-15 dB,enabled by the high-power handling and low loss of the hollow-core fiber's resonator.Moreover,our results show appealing performance parameters,including a fractional frequency stability of4×10^(-13)at 1 s averaging time and a Lorentzian component of the linewidth of 0.2 Hz.
