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Microwave photonic solutions of frequency measurement have advantages in broad frequency coverage, but achieving high-resolution measurement remains a challenge. Those schemes based on optical frequency combs could achieve high-resolution measurement over a broad frequency range. Here, a dead-band-free, high-resolution microwave frequency measurement scheme based on undersampling the microwave signal...
We demonstrate a wavelength tunable dual-wavelength fiber laser using black phosphorus (BP) saturable absorber. By controlling the tunable filter together with a polarization controller to adjust intra-cavity birefringence, dual-wavelength pulses tunable from 1532 nm to 1545 nm are observed.
Laser ranging based on asynchronous sampling of ultrashort optical pulses is proposed and experimentally demonstrated using just one polarization-multiplexed mode-locked fiber laser, which produces two orthogonal polarized, coherent pulse trains with slightly different repetition rates.
A novel Goos-Hanchen shift sensor based on Bloch surface wave excited in a one-dimensional photonic crystal slab is proposed and exhibits ultrahigh sensitivity. The experimental demonstration indicates a resolvable refractive index of 6∗10−7 RIU.
A high-resolution laser ranging scheme using one dual-wavelength femtosecond fiber laser, which generates a dual-comb with their frequency difference inherently locked by the intracavity dispersion, is experimentally demonstrated for the first time.
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