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Conventional optical tweezers handle non-absorptive (transparent) particles, and the force exerted to the particle is proportional to the intensity of the trapping laser. Recently, some works on selective trapping/manipulation of absorptive particles based on resonance effects have been reported. Some years ago, our research group found that the use of an ultra-short pulsed laser as a trapping light...
A novel approach to generate tunable microwave photonic pulse shaping based on modified incoherent frequency-to-time mapping (FTTM) is proposed. By adjusting the product of the bit-rate and the pulsewidth (i.e. BΔT) to introduce the intersymbol interference, we demonstrate the effectiveness of our approach by generating typical UWB and triangular pulses.
Absolute phase noise < −100 dBc/Hz at 1 Hz offset from a 10 GHz carrier is demonstrated by using an Er:fiber frequency comb to frequency-divide a narrow linewidth CW laser.
An optical frequency comb locked to a stable optical reference can serve as a source for microwave signals having very low close-to-carrier phase noise. This has recently been confirmed by comparing two independent systems, yielding an absolute phase noise of −104 dBc/Hz at 1 Hz offset from a 10 GHz carrier. The corresponding timing jitter is 760 attoseconds, integrated from 1 Hz to 1 MHz. Here we...
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