Towards an all fibre based optical frequency standard using acetylene-filled hollow-core photonic bandgap fibres.

With a recently developed simple and compact acetylene stabilized fibre laser, we obtained a shot-term relative frequency instability of 5.0x10"13(τ/s)^-1/2 for averaging times τ up to 100 s, and a relative repeatability over 11 weeks of 4.3x10^-13. This laser uses a 21 cm long bulk gas cell, and replacing this cell with a gas-filled hollow-core photonic bandgap fibre may reduce the complexity and the size of the laser setup even further.