1 齐鲁工业大学（山东省科学院），激光研究所，山东 济南 250103
2 山东微感光电子有限公司，山东 济南 250103
3 广东感芯激光科技有限公司，广东 佛山 528226
我国煤矿工作条件复杂，存在瓦斯爆炸、火灾、设备故障、次生火灾等安全隐患。光纤/激光传感器以其无源、本质安全的特性，以及高精度、低漂移等性能，在煤矿安全领域具有传统电子类传感器无法比拟的优势。本文介绍了激光甲烷、一氧化碳等气体传感器，光纤光栅风速传感器和光纤分布式温度传感器的研究进展，及其在智能矿山建设中的煤矿瓦斯监控、智能防火和安全监测预警等典型应用。
激光与光电子学进展
2021, 58(13): 1306016
Author Affiliations
Abstract
State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong University, Ji’nan 250100, China
We demonstrate a high-pulse-energy, short-pulse-width passively Q-switched (PQS) Nd:YAG/V3+:YAG laser at 1.3 μm, which is end-pumped by a pulsed laser diode. During the PQS regime, a maximum total output pulse energy of 3.3 mJ is obtained under an absorbed pump pulse energy of 21.9 mJ. Up to 400 μJ single-pulse energy is realized with the shortest pulse width of 6.16 ns and a pulse repetition frequency of 34.1 kHz, corresponding to a peak power of 64.9 kW. The high-energy laser pulse is operated in the dual wavelengths of 1319 and 1338 nm, which is a potential laser source for THz generation.
140.3480 Lasers, diode-pumped 140.3538 Lasers, pulsed 140.3540 Lasers, Q-switched 140.3580 Lasers, solid-state Chinese Optics Letters
2015, 13(2): 021403
Author Affiliations
Abstract
State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
In this Letter, a gray-tracking-resistant—potassium titanyl phosphate (GTR-KTP) crystal is used for intracavity frequency doubling red laser generation for the first time. Under the 808 nm LD pump power of 180 W, as high as 12.5 W of red laser output is obtained with the optimum repetition rate of 7 kHz. Within the red laser power variation range between the maximum to 70%, a temperature tolerance is measured to be 35°C. The results prove that GTR-KTP should be a potential nonlinear crystal for red laser generation.
140.3480 Lasers, diode-pumped 140.3580 Lasers, solid-state Chinese Optics Letters
2015, 13(5): 051402
Author Affiliations
Abstract
State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
A compact saturable absorber mirror (SAM) based on few-layer molybdenum disulfide (MoS2) nanoplatelets was fabricated and successfully used as an efficient saturable absorber (SA) for the passively Q-switched solid-state laser at 1 μm wavelength. Pulses as short as 182 ns were obtained from a ytterbium-doped (Yb:LGGG) bulk laser Q-switched by the MoS2 SAM, which we believe to be the shortest one ever achieved from the MoS2 SAs-based Q-switched bulk lasers. A maximum average output power of 0.6 W was obtained with a slope efficiency of 24%, corresponding to single pulse energy up to 1.8 μJ. In addition, the simultaneous dual-wavelength Q-switching at 1025.2 and 1028.1 nm has been successfully achieved. The results indicate the promising potential of few-layer MoS2 nanoplatelets as nonlinear optical switches for achieving efficient pulsed bulk lasers.
Lasers Lasers solid-state solid-state Nonlinear optical materials Nonlinear optical materials Nanomaterials Nanomaterials Photonics Research
2015, 3(2): 02000A25
Author Affiliations
Abstract
We demonstrate a high power continuous-wave (CW) and acoustic-optically (AO) Q-switched 1314-nm laser with a diode-side-pumped Nd:YLF module. A maximum CW output power of 21.6 W is obtained with a diode pump power of 180 W, corresponding to an optical-to-optical conversion efficiency of 12.0% and a slope efficiency of 16.1%. In the Q-switching operation, a highest pulse energy of 3.8 mJ is obtained at a pulse repetition rate of 1 kHz. The shortest pulse width and maximum single peak power are 101.9 ns and 37.3 kW, respectively.
140.3480 Lasers, diode-pumped 140.3540 Lasers, Q-switched Chinese Optics Letters
2014, 12(3): 031402
