Abstract
The carrier-envelope-offset frequencies of the pump, signal, idler and related sum-frequency mixing pulses have been locked to 0 Hz in a 20-fs-Ti:sapphire-pumped optical parametric oscillator, satisfying a critical prerequisite for optical attosecond pulse synthesis.
Highlights
Nonlinear (2) media provide frequency-conversion bandwidths of 1 – 2 PHz, sufficient to support sub-500-as optical fields, offering a radically different route to this temporal regime than attosecond pulses produced by high-harmonic generation
Optical heterodyning at the avalanche photodiode (APD) in each nonlinear interferometer produces a frequency at fREP with sidebands at fREP / 4
Phase coherence was confirmed by implementing a measurement interferometer (Figure 1) in which light from the second photonic crystal fibers (PCFs), which contained a strong 530-nm component and a weaker 642-nm component, was interfered with visible light exiting one of the optical parametric oscillator (OPO) folding mirrors
Summary
Nonlinear (2) media provide frequency-conversion bandwidths of 1 – 2 PHz, sufficient to support sub-500-as optical fields, offering a radically different route to this temporal regime than attosecond pulses produced by high-harmonic generation. We demonstrated coherent pulse synthesis between the SHG pulses from an OPO and those of its Ti:sapphire pump laser by locking the CEO frequencies of both sources to a common value [1]. This approach can be generalized to allow pump and OPO pulses at multiple wavelengths to be made coherent by locking their CEO frequencies to 0 Hz [2]. We describe how this approach was applied to achieve broadband phase coherence between a pump laser and multiple outputs from an OPO, spanning > 0.6 PHz in bandwidth [3]
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