Long distance simultaneous measurement of strain and temperature based on multiwavelength Raman fiber lasers

2006 ◽  
Author(s):  
Young-Geun Han ◽  
Ju Han Lee ◽  
Sang Bae Lee
Keyword(s):  
Simultaneous Measurement ◽  
Fiber Lasers ◽  
Long Distance

scholarly journals Small All-Range Lidar for Asteroid and Comet Core Missions

Sensors ◽  
2021 ◽  
Vol 21 (9) ◽  
pp. 3081
Author(s):  
Xiaoli Sun ◽  
Daniel R. Cremons ◽  
Erwan Mazarico ◽  
Guangning Yang ◽  
James B. Abshire ◽  
...  
Keyword(s):  
Fiber Lasers ◽  
Dynamic Range ◽  
Photon Counting ◽  
Avalanche Photodiode ◽  
Integration Time ◽  
Sample Collection ◽  
Long Distance ◽  
Linear Mode ◽  
Internal Gain ◽  
Pseudo Noise

We report the development of a new type of space lidar specifically designed for missions to small planetary bodies for both topographic mapping and support of sample collection or landing. The instrument is designed to have a wide dynamic range with several operation modes for different mission phases. The laser transmitter consists of a fiber laser that is intensity modulated with a return-to-zero pseudo-noise (RZPN) code. The receiver detects the coded pulse-train by correlating the detected signal with the RZPN kernel. Unlike regular pseudo noise (PN) lidars, the RZPN kernel is set to zero outside laser firing windows, which removes most of the background noise over the receiver integration time. This technique enables the use of low peak-power but high pulse-rate lasers, such as fiber lasers, for long-distance ranging without aliasing. The laser power and the internal gain of the detector can both be adjusted to give a wide measurement dynamic range. The laser modulation code pattern can also be reconfigured in orbit to optimize measurements to different measurement environments. The receiver uses a multi-pixel linear mode photon-counting HgCdTe avalanche photodiode (APD) array with near quantum limited sensitivity at near to mid infrared wavelengths where many fiber lasers and diode lasers operate. The instrument is modular and versatile and can be built mostly with components developed by the optical communication industry.

Performance enhancement of long-distance simultaneous measurement of strain and temperature based on a fiber Raman laser with an etched FBG

2005 ◽  
Vol 17 (9) ◽  
pp. 1920-1922 ◽  
Author(s):  
Thi Van Anh Tran ◽  
Young-Geun Han ◽  
Young Jun Lee ◽  
Sang Hyuck Kim ◽  
Sang Bae Lee
Keyword(s):  
Simultaneous Measurement ◽  
Performance Enhancement ◽  
Raman Laser ◽  
Long Distance

Long distance simultaneous measurement of bending and temperature based on a dual-wavelength Raman fiber laser

2011 ◽  
Author(s):  
Oh-Jang Kwon ◽  
Hyun-Joo Kim ◽  
Min-Seok Yoon ◽  
Sangoh Park ◽  
Youngbo Shim ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Simultaneous Measurement ◽  
Dual Wavelength ◽  
Long Distance ◽  
Raman Fiber Laser

scholarly journals Long-distance fiber-optic point-sensing systems based on random fiber lasers

2012 ◽  
Vol 20 (16) ◽  
pp. 17695 ◽  
Author(s):  
Z. N. Wang ◽  
Y. J. Rao ◽  
H. Wu ◽  
P. Y. Li ◽  
Y. Jiang ◽  
...  
Keyword(s):  
Fiber Lasers ◽  
Fiber Optic ◽  
Long Distance ◽  
Sensing Systems

scholarly journals Fabrication of 2 kW-Level Chirped and Tilted Fiber Bragg Gratings and Mitigating Stimulated Raman Scattering in Long-Distance Delivery of High-Power Fiber Laser

Photonics ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 369
Author(s):  
Xiaofan Zhao ◽  
Xin Tian ◽  
Meng Wang ◽  
Binyu Rao ◽  
Hongye Li ◽  
...  
Keyword(s):  
Laser Beam ◽  
Fiber Laser ◽  
High Power ◽  
Fiber Lasers ◽  
Stimulated Raman Scattering ◽  
Beam Quality ◽  
Fiber Bragg Gratings ◽  
Long Distance ◽  
Laser Beam Quality ◽  
Distance Delivery

Chirped and tilted fiber Bragg gratings (CTFBGs) have attracted a lot of attention in stimulated Raman scattering (SRS) suppression of high-power fiber lasers. However, the laser power handling capacity seriously limits their applications. In this paper, by optimizing the inscription parameters and post-processing strategy, we fabricate a large-mode-area double-cladding CTFBG with a thermal slope of ~0.015 °C/W due to the low insertion loss of about 0.15 dB, which make it possible for direct kilowatt-level application. A 2 kW-level fiber laser oscillator is employed to test the CTFBG, and a series of experiments have been carried out to compare the effect of SRS mitigation in high-power fiber laser long-distance delivery. In addition, the influence of CTFBGs on laser beam quality is studied for the first time. Experimental results indicated that the CTFBG could effectively mitigate SRS and has no obvious influence on laser beam quality. This work opens a new opportunity for further power scaling and the delivery of high-power fiber lasers over longer distances.

Sign in / Sign up

Export Citation Format

Share Document