GaSe crystals that are promising as nonlinear optical converters in the mid- and far-infrared ranges are charac- terized by high Fresnel losses leading to transmittance per surface at the level of 77%. In this study, antireflection microstructures (ARMs) were fabricated on the surface of the GaSe single crystal by single-pulse femtosecond laser ablation. This method makes it possible to increase the transmission up to up to 92%.
We study the operating speed of high-speed photodetector based on GaSb/GaInAsSb/GaAlAsSb heterostructure with frontal bridge contact depending on the wavelength, radiation power, and bias voltage. The ultra-fast fiber lasers and high-speed oscilloscope were used for measurements.
We simulate supercontinuum generation in a fiber pumped by noise-like laser pulses for possible use in mid-IR spectroscopic breath analysis. The study uses a commercially available InF3 ZBLAN fiber and a Tm-doped all-fiber passively mode-locked laser. The supercontinua are modeled with input laser parameters in two different generation regimes with an average power of 560 mW and pulse durations of 300 and 800 fs. The maximum numerically achieved spectrum extends from 1 to 8.4 μm.
Currently, lasers are widely used for surgery, medical diagnostics and oncology research. Unfortunately, most of the used laser sources have a significant drawback - the lack of operating wavelength tuning possibility, which imposes significant limitations on the investigation of biological tissues spectral properties and searching for the optimal mode of their treatment. Comparison between different promising mid-IR sources was made. We report on development of mid-infrared (mid-IR) tunable lasers based on the Cr2+:CdSe single-crystals. These lasers operate in CW mode with the maximum output power of up to 2 W and possible tuning range from 2.2 to 3.6 μm.
Fiber Bragg grating (FBG) strain sensors are powerful tools for structural health monitoring applications. However, FBG sensor fabrication and packaging processes can lead to a non-linear behavior, that affects the accuracy of the strain measurements. Here we present a novel nondestructive calibration technique for FBG strain sensors that use a mechanical nanomotion transducer. A customized calibration setup was designed based on dovetail-type slideways that were mechanized using a stepping motor. The performance of the FBG strain sensor was investigated through analysis of experimental data, and the calibration curves for the FBG strain sensor are presented.
Recently similariton (or self-similar pulse) fiber lasers have attracted great attention due to their capabilities of highenergy
pulse generation that could find different applications in science and industry. Moreover it is very important to
reach stable pulse generation for the application as a frequency divider in optical frequency standard. Hybrid modelocking
mechanism was used for obtaining stable similariton generation at 38 MHz pulse repetition frequency. It
involves two types of mode-locking mechanisms in the cavity - saturation of carbon nanostructures absorber (recovery
time Trt ~ 500 fs) and nonlinear polarization evolution based on the nonlinear Kerr-effect (Trt ~ 10 fs). It was shown that
total intracavity dispersion should be slightly positive for generating stable similaritons with duration of less than 90 fs
and spectral bandwidth of more than 50 nm at 11.2 mW output average power that could be further applied in an all-fiber
MOPA setup.
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