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A low-energy femtosecond laser micromachining system, which is effectively applied to fabricate micro-structured carbon nanotube field emitter arrays with different tip sizes and shapes, is presented. Superior emission characteristics are obtained with the patterned structures.
A new chalcone crystal designed with suitable functional groups exhibits ultrafast response (<90 fs) and very large two-photon absorption (2PA) (beta > 8 times102 cm/GW). Its low intensity threshold (<4 MW/cm2) for 2PA and high damage resistance (>8 GW/cm2) are quite interesting for 2PA-based optical limiting.
We propose a novel in-line saturable absorber by employing a carbon nanotube-filled hollow optical fiber. Robust and efficient all-fiber ultrafast lasers are realized based on this scheme, exhibiting 2.5-nm 3-dB spectral bandwidth at 18.5 MHz.
A new Cu-based metal organic complex incorporated into poly (methyl mathacrylate) film exhibits large and fast offresonant optical nonlinearity in the 800 to 1550 nm wavelength range. A large chi(3) value of 1.8 times 10-10 esu is estimated.
BiB3O6 (BIBO) crystal has been used for efficient second-harmonic generation (SHG) of a low-power femtosecond Er-fiber laser-amplifier system operating at 56 MHz. At the maximum input power of 65 mW, an internal conversion efficiency of 23% was achieved for SHG at 782 nm, with a pulse duration of 64 fs. A comparison with beta-BaB2O4 reveals superior properties of BIBO for such ultrashort-pulse ultra-broadband...
Angularly and spectrally resolved second harmonic studies for c-axis ZnO nanorods are reported. 7.5 times higher efficiency than for BBO was found at 55 GW/cm2 at Ti:sapphire laser oscillator wavelengths. Spectral profiles agree with simulations.
Ultrafast single-walled carbon nanotube saturable absorbers were fabricated and optimized for mode-locking solid-state lasers near 1 mum. Their typical modulation depth and recovery time were measured to be Gt 0.3% and ~ 750 fs, respectively.
We present low-power, femtosecond laser machining on vertically aligned array of carbon nanotube (CNT) films synthesized by two different growth techniques. Arrays of holes can be efficiently fabricated for a possible application as CNT based metamaterials, showing completely different features for the two samples.
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