Development of a High-Repetition-Rate Ti:Sa Optical Frequency Comb at INTI for Laser Frequency Traceability and Calibration

We report the development of the first optical frequency comb (OFC) based on an in-house Ti:Sa femtosecond laser in Argentina, implemented at the National Metrology Institute (INTI). The system operates at a 1 GHz repetition rate with a broadband spectrum spanning from 500 to 1100 nm. The carrier-envelope offset frequency and the repetition rate are both phase-locked to a cesium atomic clock, establishing a direct link between the national frequency standard and the optical domain. This development represents a major step forward for national metrology and enables frequency-instability measurements of stable lasers within the country. To demonstrate its capabilities, the performance of a Nd:YAG Mephisto laser at 1064 nm was evaluated by measuring the beat note between its second harmonic and the OFC, allowing a direct assessment of its frequency noise and stability.