In this paper, we firstly demonstrate a diode-pumped passive mode-locking laser based on a Tm:YAG crystal and a MoS2 saturable absorber. The Tm:YAG laser produced a 2.68 W continuous-wave (CW) output power at 2013.8 nm. A maximum average output power of 0.2 W was achieved at a pulse repetition rate of 232.2 MHz and a pulse width of about 297.5 ps were achieved under the passive mode-locking operation. In addition, the M2 factors were 1.07 and 1.05 in horizontal and vertical directions, respectively, indicating the near-diffraction limited beam propagation.
A passively Q-switched (PQS) Tm:YAP laser was faultlessly realized with the WSe2 nanosheets as the saturable absorber (SA). A 0.97-W average output power at 1987.5 nm and a 459.0-ns pulse duration were obtained with a 9.5% optical conversion efficiency, and a 11.2-μJ pulse energy and a 24.4-W peak power were gained with a 10.2-W pump power. In addition, the beam quality factors of 2 1.11 x M2x = and 2 1.16 y M2y = were obtained from Tm:YAP laser in continuous wave (CW) with the output power of 2W.
Hand gesture recognition (HGR) is a natural way of Human Machine Interaction and has been applied on different areas. In this paper, we discuss works done in the area of applications of HGR in industrial robots where focus is on the processing steps and techniques in gesture-based Human Robot Interaction (HRI), which can provide useful information for other researchers. We review several related works in the area of HGR based on different approaches including sensor based approach and vision approach. After comparing the two approaches, we found that 3D vision-based HGR method is a challenging but promising researching area. Then, concerning works of implementation of HGR in industrial scenario are discussed in detail. Pattern recognition algorithms that effectively used in HGR like k-means, DTW etc. are briefly introduced as well.
KEYWORDS: Operating systems, Laser processing, Data conversion, Mobile robots, Particles, Transform theory, Laser range finders, Data processing, Distance measurement, Data acquisition
Laser SLAM can be implemented using ROS and Ubuntu system. However, it cannot be run in Windows operating system which is more stable than Ubuntu. To implement the laser SLAM in Windows system, the main program of laser SLAM in ROS is carefully analyzed and modified to make it adapt to Windows system. The main programs of laser processing, coordinate transformation and map construction are rewritten and reorganized. To verify the effectiveness of our work, experiments were conducted in real-world environments. The results of experiments validated that laser SLAM can be implemented in Windows system by rewriting and reorganizing these main programs.
A high energy of b-cut Tm, Ho:YAlO3 laser is reported in the paper. The laser operated in acousto-optical Qswitched mode at 2.12 μm. The output average power of 9.61 W was achieved at the pulse repetition frequency of 10 kHz ,and the power of 11.6 W was acquired in continuous wave mode. Moreover, the energy per pulse of 0.961 mJ in 64.4 ns was acquired at 10 kHz with a 14.92-kW peak power.
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