Abstract
We demonstrate an octave-spanning, self-referenced optical frequency comb produced with a high-repetition-rate (frep=585 MHz) femtosecond Ti:Sapphire laser that requires less than 1 W of 532 nm pump power. The frequency comb was stabilized to a CW laser as required for optical clocks and low noise frequency synthesis. These results should be relevant for applications that require more-compact and efficient frequency combs.
Highlights
The Ti:Sapphire based femtosecond laser frequency comb (FLFC) has shown tremendous utility for a variety of high precision optical frequency measurements [1,2,3,4,5]
We demonstrate an octave-spanning, self-referenced optical frequency comb produced with a high-repetition-rate femtosecond Ti:Sapphire laser that requires less than 1 W of 532 nm pump power
Because the typical pumping scheme involves a high-power (5-8 W) frequency-doubled Nd:vanadate laser, a complete Ti:Sapphire FLFC remains a costly, heavy, and electrically inefficient device. This is unfortunate because the small footprint of a high repetition rate (500-1000 MHz) Ti:Sapphire laser already lends itself to being the basis of a compact FLFC [6]
Summary
The Ti:Sapphire based femtosecond laser frequency comb (FLFC) has shown tremendous utility for a variety of high precision optical frequency measurements [1,2,3,4,5]. Photodetection of the optical pulse train produces a microwave frequency comb at frep and its harmonics In this case, a high repetition rate results in more power in the microwave harmonics, which is important for the generation of low noise microwave signals at 10 GHz [11]. Both f0 and fbeat are phase-locked as required to generate a phase stable frequency comb Such low threshold operation should lead to smaller, less expensive and more efficient Ti:Sapphire pumping schemes including either a 1 W Nd-based green sources or an efficient frequency-doubled Yb fiber laser [15]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
