Single frequency laser with long pulse for coherent lidar

Zhou, Jun; Zang, Hang; Liu, Dan; Bi, Jinzi; Liu, Jiqiao; Wang, Juntao; Zhu, Xiaolei; Chen, Weibiao

doi:10.1109/cleopr.2009.5292553

Cited by 6 publications

(5 citation statements)

References 4 publications

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“…For fiber lasers, it is difficult to generate a laser beam carrying OAM directly because of a coherent superposition of opposite handedness modes in the laser resonator. Zhou et al proposed a method to produce an OAM beam laser with a tunable wavelength and topological charge value [15]. However, free-space propagation is used in the fiber laser cavity, which could increase the complexity of the system and instability of the laser output.…”

Section: Introductionmentioning

confidence: 99%

Few-mode fiber Bragg grating-based multi-wavelength fiber laser with tunable orbital angular momentum beam output

et al. 2018

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We experimentally demonstrate a multiwavelength fiber ring laser with tunable orbital angular momentum (OAM) beam output. The laser is embedded with a few-mode fiber Bragg grating and a mode selective coupler (MSC). The mode conversion from LP01 mode to LP11 mode is realized by using the MSC as a mode converter. By rotating a polarizer set at the output end of the MSC, the topological charge of the OAM beam can be tuned from l = −1 to l = +1 and thus a tunable OAM beam is obtained. By adjusting the polarization controllers (PCs), the laser can operate under single-, dual- and triple-wavelength lasing conditions.

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Section: Introductionmentioning

confidence: 99%

Few-mode fiber Bragg grating-based multi-wavelength fiber laser with tunable orbital angular momentum beam output

et al. 2018

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“…To enable maximum efficiency and reliability of these wind power generating systems, it is necessary to integrate complex real-time sensing systems to monitor the magnitude and direction of the kinetic energy to be harnessed [2,3,4] . LIDAR measurement techniques have shown significant potential and the design of sensing systems is rapidly evolving [4,5,6] .…”

Section: Introductionmentioning

confidence: 99%

Development of a high-speed wideband wavelength tunable infra-red laser source for real time wind turbine array sensing applications

Mitchell

Janssen

Poor

2011

Integrated Photonics: Materials, Devices, and Applications

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This paper reports the development of an infra-red circa 193THz (~1.5µm) frequency tunable laser source selected and evaluated for photonic environment sensing systems. LIDAR (LIght Detection And Ranging) offers a method of remote wind speed measurement. Widespread deployment of the technique has been limited by the expense and complexity of LIDAR systems. However development of systems based on optical fiber and photonic components from the telecommunications industry promises improvements in cost, compactness, and reliability, so that it becomes viable to consider deployment of such systems on large wind turbines for the advance detection of fluctuations of wind speed. A monolithic multi-section laser, originally designed as a tunable source for telecommunications applications, has been modified and re-evaluated as a source for sensing applications, based on the technique of coherent laser radar (CLR), and coherent doppler LIDAR (CDL). A tunable frequency optical source should fulfil specific technical criteria to fulfil the applications requirements; speed of frequency selection, absolute accuracy of emitted frequency, spectral purity, and stability. Custom electronics and firmware were developed to realise an improvement in frequency switching speed by a factor of 10 relative to equivalent commercially available telecoms (DBR) sources, satisfying the target application requirements. An overview of the sensing architecture is presented, a detailed description of the fast tuning process described, including the custom hardware and firmware, and specifically the laser energising sequence. The results of the laser module are then presented with detailed consideration of the target application.

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“…Experiments of hard-target speed calibraions and line-of-sight (LOS) wind velocity measurements were presented. The schematic configuration of the CDL system was shown in Fig.1, which consisted of three subsystems: an injection-seeded Nd:YAG laser with long pulse duration [4], an optical transceiver, a A/D signal acquisition and processing module. Part of the seeder laser with 0.5mw power was coupled into a polariztion maintaing (PM) fiber.…”

Section: Introductionmentioning

confidence: 99%

Development of a coherent Doppler lidar to measure atmosphere windshear

Liu¹,

Zhu²,

Zhou³

et al. 2011

2011 International Quantum Electronics Conference (IQEC) and Conference on Lasers and Electro-Optics (CLEO) Pacific Rim Incorpo

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A pulsed coherent Doppler lidar prototype at wavelength of 1064nm was developed to measure windshear in the lower troposphere layer. The laser transmitter was an injection-seeded pulsed Nd:YAG laser with pulse energy of 0.5mJ, pulse duration of 80ns and pulse repetion rate of 200Hz. Hard-target speed calibration expriments were carried out to demonstrate speed measurement accuracy of 0.23m/s for the lidar. Then line-of sight atmosphre wind velocity measurement in 500m range with 40m range resolution was implemented. The lidar is being optimized to measure windshear at 2km range away.

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Single frequency laser with long pulse for coherent lidar

Cited by 6 publications

References 4 publications

Few-mode fiber Bragg grating-based multi-wavelength fiber laser with tunable orbital angular momentum beam output

Few-mode fiber Bragg grating-based multi-wavelength fiber laser with tunable orbital angular momentum beam output

Development of a high-speed wideband wavelength tunable infra-red laser source for real time wind turbine array sensing applications

Development of a coherent Doppler lidar to measure atmosphere windshear

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