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Self-mixing laser Doppler velocimeter (SM-LDV) using semiconductor lasers is a well-established technique for velocity measurement. It has the advantages of simple and compact setup, good sensitivity and direction dis-criminability [1]. However, being a coherent detection scheme, SM-LDV also encounters the similar problems in the conventional single-frequency LDV (SF-LDV) where the velocity resolution...
We report results of the output characteristics of a circular ring laser diode with two Y-junction output couplers which forms a hybridization of a circular ring resonator and a linear U shape resonator. It shows that the ring laser has two emission characteristic spectrums, a single mode emission at 652.86nm and a multi-modes emission at around 652.24nm at injection current of 300mA. Measurements...
We report recent progress for InGaN-based lasers diodes fabricated on nonpolar/semipolar substrates. We demonstrate single-mode green lasers operating with >3.5% wall-plug-efficiency and 100mW output power. In the blue regime we demonstrate single-mode lasers with >23% wall-plug-efficiency and high power lasers with >1.4W of output power.
We report a tunable pulsed optical parametric oscillator using a 2D PPLN as simultaneous an electro-optic Bragg Q-switch and a parametric generator in a Nd:YVO4 laser. >650-W peak-power eye-safe light was obtained with this system.
Microwave signal generation from the saturable absorber of a monolithic quantum dot passively mode-locked laser is presented. We observe a differential efficiency of 33% that measures the optical-to-RF power conversion. An optimum extraction efficiency of the saturable absorber of about 86% is also found. To assess the stability of the device, the mode-locking operation regime of the quantum dot device...
Contributions of both the ground and excited states in the degradation of the coherence collapse threshold in a quantum dash laser are analyzed. The excited states are found to strongly alter the device's feedback sensitivity.
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