Design of Spectroscopic Filter of All-Fiber Rotational Raman Lidar for Temperature Profiling

Jiandong, 毛建东 Mao; Dengxin, 华灯鑫 Hua; Liaolin, 胡辽林 Hu; Yufeng, 王玉峰 Wang; Li, 汪丽 Wang

doi:10.3788/aos20103001.0007

Cited by 4 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Especially in the all-fiber differential absorption lidar (DIAL) or rotational Raman lidar (RRL), which were designed for profiling the water vapor or temperature of atmosphere [6][7][8][9][10] , a SMF was employed to transfer the space laser beam into spectroscopic system, therefore the maximum return light loss exists in coupling position between the telescope and SMF [10] . When the mode of laser light coupled into SMF is matched with the mode field distribution of SMF, the maximum coupling efficiency can be obtained [11] .…”

Section: Introductionmentioning

confidence: 99%

Analysis of influence factors for coupling efficiency of single mode fiber

et al. 2012

View full text Add to dashboard Cite

In many research fields the coupling efficiency of single mode fiber is an important issue and is influenced by some parameters. In this paper, the influence factors on coupling efficiency of single mode fiber were investigated, especially the influence of position of waist of laser beam is analyzed. For verifying these influence factors some numerical simulations were carried out. The results show that when the waist position being farther away from the laser emission system, the coupling efficiency is larger; when the waist position is located at infinite distance and the number of Airy speckles is 0, the relationship curve between the coupling efficiency and parameter a is unimodal; and also with parameter a tending towards zero the coupling efficiency is close to a bigger stable value, which differs from computation result in previous reference. These conclusions have important directive significance to the engineering design of coupling of single mode fiber.

show abstract

Section: Introductionmentioning

confidence: 99%

Analysis of influence factors for coupling efficiency of single mode fiber

et al. 2012

View full text Add to dashboard Cite

show abstract

“…In recent years, some research groups have studied the coupling efficiency of single mode fiber (SMF) in some important application field, such as the coherent lidar [1] , free space laser communication [2][3][4] , semiconductor lasers [5] , fiber connection, directional coupler, fiber sensor, and so on. In all-fiber rotational Raman lidar (RRL) designed for profiling the water vapor or temperature of atmosphere [6] , the SMF must be used to couple the return signal from telescope to the spectroscopic filter. Due to the small diameter, undoubtedly, the coupling efficiency between telescope and SMF is very low and the coupling system must be carefully designed [7] .…”

Section: Introductionmentioning

confidence: 99%

Analysis of Influence of Beam Expender Parameters on Coupling Efficiency of Single Mode Fiber Used in Lidar

Sheng

Mao

2013

KEM

View full text Add to dashboard Cite

Based on theoretical analysis, the beam expender used in all fiber lidar with a coupling efficiency of single mode fiber (SMF) is investigated. Some numerical computations are carried out and following results are obtained. For all fiber lidar in order to get the maximum coupling efficiency on SMF, the relationship between the distance d, ranged from the secondary to primary lens of the beam expender, and the laser waist spot location l, which is at a distance from the secondary lens of beam expender are obtained. And also the relationship between l and the measurable bandwidth is analyzed. Under the condition that if the laser location is certain and the imagine spot location is infinite, with adjusting the distance d which can make the image spot size obtain its minimum, the maximum coupling efficiency about 70.6% is got and the adjusting range of d has only 0.2~0.9mm. Assuming that the image spot distance is infinite, and the minimum of spot radius is got after the laser waist spot goes through the beam expender, the function between d and l is retrieved by use of laser propagation theory. By comparing the theoretical curve with the computing one, the theoretical function agrees with the numerical computing curve approximately. These conclusions have the important directive significance for design of all fiber Lidar.

show abstract

Design of a water vapor spectroscopy system for Raman lidar based on sampled fiber Bragg grating

Gong,

Li,

Zhang

et al. 2024

Opt. Continuum

View full text Add to dashboard Cite

Aiming to minimize the interference of Mie-Rayleigh scattering and solar background light on the water vapor Raman lidar, this study proposes a multi-cascade water vapor spectroscopy system based on sampling fiber Bragg grating (SFBG) and fiber Bragg grating (FBG). The proposed system uses the principle of Raman lidar to detect water vapor. The parameters affecting the SFBG’s performance are optimized by the matrix transmission method, and the SFBG performance parameters with high reflectivity and narrow bandwidth at specific wavelengths are obtained. According to the simulation results of the signal strength of each channel, the water vapor backscattering signal is 50 dB and 30 dB stronger than the Mie-Rayleigh scattering and solar background light, respectively. At a signal-to-noise ratio of 10, the detection altitude during the day is 6 km. The results also indicate that the proposed spectroscopy system has stable spectroscopy performance and miniaturized volume, providing a new solution for the development of vehicle-mounted and airborne lidar.

show abstract

Design of Spectroscopic Filter of All-Fiber Rotational Raman Lidar for Temperature Profiling

Cited by 4 publications

References 0 publications

Analysis of influence factors for coupling efficiency of single mode fiber

Analysis of influence factors for coupling efficiency of single mode fiber

Analysis of Influence of Beam Expender Parameters on Coupling Efficiency of Single Mode Fiber Used in Lidar

Design of a water vapor spectroscopy system for Raman lidar based on sampled fiber Bragg grating

Contact Info

Product

Resources

About