Fiber ring laser cavity for strain sensing via beat frequency demodulation

2020 ◽  
Vol 476 ◽  
pp. 126326
Author(s):  
Jing Tian ◽  
Mei-jiang Hou ◽  
Yang Jiang ◽  
Hao Luo ◽  
Chuan-yu Tang
Keyword(s):  
Ring Laser ◽  
Beat Frequency ◽  
Laser Cavity ◽  
Strain Sensing ◽  
Fiber Ring Laser ◽  
Fiber Ring ◽  
Frequency Demodulation

Taper biosensor in fiber ring laser cavity for protein detection

2020 ◽  
Vol 125 ◽  
pp. 106033
Author(s):  
M. Mansor ◽  
M.H. Abu Bakar ◽  
M.F. Omar ◽  
Y. Mustapha Kamil ◽  
N.H. Zainol Abidin ◽  
...  
Keyword(s):  
Ring Laser ◽  
Protein Detection ◽  
Laser Cavity ◽  
Fiber Ring Laser ◽  
Fiber Ring

Dynamic Strain Sensing System Based on Fiber Ring Laser

2019 ◽  
Vol 39 (10) ◽  
pp. 1006006
Author(s):  
毛黎明 Mao Liming ◽  
陶传义 Tao Chuanyi ◽  
顾子迪 Gu Zidi ◽  
张婧 Zhang Jing ◽  
成俊桦 Cheng Junhua ◽  
...  
Keyword(s):  
Ring Laser ◽  
Dynamic Strain ◽  
Strain Sensing ◽  
Fiber Ring Laser ◽  
Fiber Ring ◽  
Sensing System

Erbium-doped fiber ring laser cavity in transient and steady states studied by a numerical approach

2000 ◽  
Vol 17 (6) ◽  
pp. 914 ◽  
Author(s):  
S. Selvakennedy ◽  
M. A. Mahdi ◽  
M. K. Abdullah ◽  
P. Poopalan ◽  
H. Ahmad
Keyword(s):  
Ring Laser ◽  
Laser Cavity ◽  
Numerical Approach ◽  
Steady States ◽  
Fiber Ring Laser ◽  
Fiber Ring ◽  
Erbium Doped

Multiplexed dynamic strain sensing system based on a fiber ring laser using a non-tunable fiber Fabry–Perot filter

2020 ◽  
Vol 59 (8) ◽  
pp. 2375 ◽  
Author(s):  
Liming Mao ◽  
Chuanyi Tao ◽  
Jing Zhang ◽  
Xuhai Jiang ◽  
Junhua Cheng ◽  
...  
Keyword(s):  
Ring Laser ◽  
Dynamic Strain ◽  
Strain Sensing ◽  
Fiber Ring Laser ◽  
Fiber Ring ◽  
Sensing System ◽  
Fabry Perot

Polarization Control of SOA-Fiber Ring Laser

2010 ◽  
Vol 459 ◽  
pp. 157-161
Author(s):  
Yoshitaka Takahashi ◽  
Ryo Niida
Keyword(s):  
Numerical Analysis ◽  
Ring Laser ◽  
Laser Cavity ◽  
Laser Sensor ◽  
Fiber Ring Laser ◽  
Fiber Ring ◽  
Polarization Control ◽  
Accuracy And Stability

We have studied a SOA-fiber ring laser and demonstrated its application to a fiber ring laser sensor so far. But in our previous study its accuracy and stability was found to be insufficient. Further investigation by numerical analysis suggested that polarization of the propagating light should be stabilized in the fiber ring laser cavity. In order to control the polarization in the cavity, we have improved the laser. The lasing linewidth has reduced significantly, which shows that the polarization is controlled and stabilized well.

Saturable absorption and its consequent effects in  bistable erbium‐doped fiber ring laser

2021 ◽  
Author(s):  
Deeksha Jachpure ◽  
Ramarao Vijaya
Keyword(s):  
Ring Laser ◽  
Optical Bistability ◽  
Laser Cavity ◽  
Gain Medium ◽  
Saturable Absorption ◽  
Fiber Ring Laser ◽  
Fiber Ring ◽  
Linear Absorption ◽  
Erbium Doped ◽  
Laser Systems

Abstract The linear absorption in erbium-doped fiber contributes to its excellent role in erbium-doped fiber amplifiers and lasers. A nonlinear optical contribution in the absorption of erbium-doped fiber is responsible for optical bistable action when it is present in a laser cavity. To quantify this effect, the variation of absorption coefficient is measured at different signal powers at multiple wavelengths in the C-band for different EDF lengths, and saturable absorption parameters such as the saturation power are extracted. Then the modification in the output characteristics of erbium-doped fiber ring laser with change in fiber length and in the presence of self-induced saturable absorption effect within the gain medium which leads to optical bistability is measured. By comparing the measured parameters obtained from saturable absorption in erbium-doped fiber and optical bistability in erbium-doped fiber ring laser, we estimated the length of the gain medium which acts as the saturable absorber inside the cavity of the laser. This is useful in constructing bistable lasers with optimized conditions. The temporal evolution of cavity loss and gain with the intra-cavity power and up- and down-thresholds helps in understanding why the down-threshold will be lesser than the up-threshold in bistable laser systems.

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