We reported on a master-oscillator fiber power amplifier (MOPA) system and a second-harmonic generation (SHG) system. Actively Q-switched Nd:YVO(4) laser was used as a seed source of light pluses. The MOPA system produced as much as 76 kW of peak power at wavelength of 1064 nm, with 35 kHz repetition rate and 20 ns pulse duration. With a lithium tr...
Multiple-port directional emission microlasers are potential light sources and optical signal processing units in photonic integrated circuits. Connecting bus waveguides to a microresonator is a simple method to realize directional emission microlasers. In this paper, we investigate square and circular resonator microlasers connected with multiple ...
AlGaInAs/InP hexagonal resonator microlasers with an output waveguide connected to one vertex of the hexagon are fabricated using standard photolithography and inductively coupled plasma (ICP) etching process. Room-temperature continuous-wave electrically injected operation with a threshold current of 18 mA is realized for a hexagon laser with an e...
The vertical leakage characteristics are investigated for whispering-gallery modes (WGMs) in the microcylinder resonators with vertical semiconductor waveguiding. The mode coupling between HE and EH modes at the boundaries between the core and cladding layers results in a vertical leakage loss for the WGMs, if the transformed modes can propagate in...
The fabrication and characterization of distributed feedback(DFB) quantum cascade lasers emitting atλ&asyum;8.5μm are reported. The first-order DFB grating structure was defined using the holographic lithography technique. Reliable dynamic single-mode emission with a side-mode suppression ratio of20 dB and a tuning coefficient of-0.277 cm-1/K from9...
An undersized humidity detecting system based on infrared spectrum absorption is introduced. A vertical-cavity surface-emitting laser is used as the light source and provides lasers at1.854μm which is a main absorption peak of water vapor. To cover all humidity condition, vapor density is detected via two different methods, which are switched by th...
High-power semiconductor laser is commonly used for pump source, but the absorption spectra width of the ion which is pumped by the laser is often small. In order to improve the pumping efficiency of high-power semiconductor laser to solid or fiber laser, the current and thermal drift coefficient of wavelength should be decreased. The influence of ...
