Future: • We are on the process of making splice with CO2       Laser to splice fiber inside the vacuum chamber. •  We are in final stage of generating frequency comb.         - Measure frequency shift and stability of those narrow feature using           frequency comb. •  We are also in the final stage to peak-lock these      narrow feature. •  To Narrow the line (Target ~1 MHz)       larger core size, coated cell? • To make fiber cell for portable frequency references.