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We present a terahertz (THz) radiation pumped by a passively mode-locked Yb-doped fiber laser using two fiber-pigtailed log-spiral-based low-temperature-grown (LTG) InGaAs photoconductive antenna (PCA) modules. The mode-locked fiber laser produces over 220 mW of the average optical power with positively chirped of 1.49 ps pulses. In order to generate THz radiation using the fiber-pigtailed PCA modules,...
An Nd:YAG laser is generally used as the optical source for photoacoustic imaging (PAI) systems, which support a high-power pulsed laser. However, PAI systems based on Nd:YAG lasers have several disadvantages, such as instability against impact and vibration, poor mobility, and large size. To overcome the limitations, we demonstrate a PAI system using a master oscillator power amplifier (MOPA) fiber...
We report two kinds of wavelength-swept lasers based on semiconductor optical amplifier for dynamic optical fiber sensors. The wavelength-swept laser has a linear relationship that exists between wavelength and time. As an application using the wavelength-swept laser for dynamic optical fiber sensors, we measure a dynamic modulation frequency of the applied electric field using a nematic liquid crystal...
We report an Yb-doped mode-locked fiber laser at 1.03 μm for time-domain terahertz spectroscopy. The total cavity length is 21.4-m long including free space. The 3 dB optical bandwidth of the mode-locked fiber laser is ∼ 3.5 nm. It can be used as an optical source for compact and potable THz radiation source.
We report a continuously tunable dual-wavelength laser based on the polymer Bragg gratings for continuous wave terahertz optical beat source generation. The polymer Bragg gratings are used to wavelength selective components in the laser cavity. The measured wavelength tuning range is about 19 nm. The side mode suppression ratio is achieved more than 30 dB for dual wavelength.
We report a high-speed long distance FBG sensor interrogation using 1.3 μm FDML wavelength-swept laser. The static strain and dynamic strain response for long distance FBG interrogation system is achieved. The FDML laser could be operated if the scanning frequency of the Fabry-Perot tunable-filter matches with the fundamental frequency of the laser cavity.
We propose a delayed optical path (DOP) scheme to increase the repetition rate of a passively mode-locked erbium fibre laser. The time interval between adjacent pulses from a passively mode-locked fiber laser with a DOP is shortened from the round trip time of the laser cavity to the time difference between the DOP and the corresponding original path in a part of the cavity. The detail of the operational...
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