Abstract
We show that a stretched-pulse mode-locked fiber laser produces a welldefined frequency comb, providing a compact source of frequency combs and allowing comb-based optical frequency metrology to be extended into the 1.55 microm region. This is achieved by comparing the frequency doubled output of the fiber laser to that of a mode-locked Ti:Sapphire laser, after the two lasers are synchronized. The offset frequency of the fiber laser frequency comb is found to be highly sensitive to the pump power, which enables the implementation of a feedback loop to control the offset frequency. The resulting RMS frequency jitter of the heterodyne beat signal is 355 kHz (0.5 Hz - 102 kHz BW) for this initial demonstration.
Highlights
Optical frequency metrology and waveform synthesis of ultrashort pulses have recently been revolutionized by the union between ultrafast lasers and laser stabilization [1,2,3,4,5]
Apart from applications pertaining to optical frequency metrology, phase stabilization of Kerr-lens mode-locked (KLM) Ti:S lasers has opened the way toward waveform synthesis of few-cycle pulses [2,7,8]
Apart from the laser repetition rate, the frequency comb of a mode-locked laser is characterized by the offset frequency, fo, which causes a frequency shift of the optical comb elements, νn, away from exact harmonics of the laser repetition rate,νn = n frep + fo
Summary
Optical frequency metrology and waveform synthesis of ultrashort pulses have recently been revolutionized by the union between ultrafast lasers and laser stabilization [1,2,3,4,5]. We demonstrate a well-behaved comb spectrum around 1.55 μm from a home-built Erbium-doped fiber laser and control of the fiber laser’s comb This is achieved by phase locking the repetition rate and frequency locking the carrier frequency of the fiber laser to those of the comb of a phase-stabilized KLM Ti:S laser. This demonstrated control capability for a fiber laser, in conjunction with the development of continuum generation at 1.5 μm, presents the possibility of a wide bandwidth optical comb, located in the telecommunication spectral window, stabilized in a self-referencing manner similar to that on which phase. This can produce a coherently synthesized pulse that is shorter than can be produced by a single oscillator [8]
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