Abstract
Gas-filled hollow-core photonic crystal fibers are used to stabilize a fiber laser to the 13C2H2 P(16) (ν1+ν3) transition at 1542 nm using saturated absorption. Four hollow-core fibers with different crystal structure are compared in terms of long term lock-point repeatability and fractional frequency instability. The locked fiber laser shows a fractional frequency instability below 4 × 10(-12) for averaging time up to 10(4) s. The lock-point repeatability over more than 1 year is 1.3 × 10(-11), corresponding to a standard deviation of 2.5 kHz. A complete experimental investigation of the light-matter interaction between the spatial modes excited in the fibers and the frequency of the locked laser is presented. A simple theoretical model that explains the interaction is also developed.
Highlights
IntroductionPortable optical frequency standards are important in metrology and in many other applications (optical sensing, telecommunication, aerospace, etc.) that need an accurate and reliable optical reference away from the laboratories
Portable optical frequency standards are important in metrology and in many other applications that need an accurate and reliable optical reference away from the laboratories
State of the art research suggest that kagome fibers produce better performance than more common hollow core photonic crystal fibers (HC-PCF), both in terms of lock-point repeatability and stability [12, 15]
Summary
Portable optical frequency standards are important in metrology and in many other applications (optical sensing, telecommunication, aerospace, etc.) that need an accurate and reliable optical reference away from the laboratories. Since the demonstration of the first photonic band gap guidance in air [8], the increased availability of fibers with an hollow core (HC) allowed to investigate the realization of a portable optical frequency reference based on a gas-filled HC fiber [9,10,11,12,13]. State of the art research suggest that kagome fibers produce better performance than more common hollow core photonic crystal fibers (HC-PCF), both in terms of lock-point repeatability and stability [12, 15]. The performance achieved improves previously published results [12, 15] for gas-filled HC fibers both in terms of frequency stability and lock-point repeatability, reducing the gap with respect to the performance achieved with bulk glass cells [7]
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