2 research outputs found
Highly-stable, flexible delivery of microjoule-level ultrafast pulses in vacuumized anti-resonant hollow-core fibers for active synchronization
We demonstrate the stable and flexible light delivery of multi-{\mu}J,
sub-200-fs pulses over a ~10-m-long vacuumized anti-resonant hollow-core fiber
(AR-HCF), which was successfully used for high-performance pulse
synchronization. Compared with the pulse train launched into the AR-HCF, the
transmitted pulse train out of the fiber exhibits excellent stabilities in
pulse power and spectrum, with pointing stability largely improved. The
walk-off between the fiber-delivery and the other free-space-propagation pulse
trains, in an open loop, was measured to be <6 fs root-mean-square (RMS) over
90 minutes, corresponding to a relative optical-path variation of <2x10-7. This
walk-off can be further suppressed to ~2 fs RMS simply using an active control
loop, highlighting the great application potentials of this AR-HCF set-up in
large-scale laser and accelerator facilities
Fabry-Perot Interferometric High-Temperature Sensing Up to 1200 °C Based on a Silica Glass Photonic Crystal Fiber
A Fabry-Perot interferometric sensor for temperature measurement was fabricated based on a silica glass solid-core photonic crystal fiber with a central air-bore. By splicing a stub of photonic crystal fiber to a standard single-mode fiber, an intrinsic Fabry-Perot cavity was formed inside the photonic crystal fiber. Sensing experiment results show that the sensor can work stably for a consecutive 24 h under temperatures up to 1100 °C, and the short-term operation temperature can reach as high as 1200 °C (<30 min). In the measurement range of 300–1200 °C, the temperature sensitivity of the peak wavelength shift can reach as high as 15.61 pm/°C, with a linearity of 99.76%. The presented interferometric sensor is compact in size and possesses advantages such as an extended working range and high sensitivity, showing promising application prospects