Effect of Reflection on Mode Competition and Multi-Frequency Oscillation in a High-Power Sub-THz Gyrotron: Experimental Observation and Theoretical Analysis

2020 ◽  
Vol 41 (6) ◽  
pp. 697-710 ◽  
Author(s):  
Teruo Saito ◽  
Maria M. Melnikova ◽  
Nikita M. Ryskin ◽  
Shunsuke Tanaka ◽  
Ryuji Shinbayashi ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Experimental Observation ◽  
High Power ◽  
Mode Competition ◽  
Frequency Oscillation

scholarly journals Rainbow on a Chip: Experimental Observation of the Trapped Rainbow Effect Using Tapered Hollow Bragg Waveguides

Eureka ◽  
2014 ◽  
Vol 4 (1) ◽  
pp. 35-39 ◽  
Author(s):  
Aaron Melnyk
Keyword(s):  
Theoretical Analysis ◽  
Experimental Observation ◽  
Entire Length ◽  
Lab On Chip ◽  
Out Of Plane ◽  
Frequency Components ◽  
Input Spectrum ◽  
Bragg Waveguides ◽  
On Chip ◽  
Future Work

Experimental observation of the ‘trapped rainbow’ in the visible is demonstrated using tapered hollow Bragg waveguides. These waveguides spatially disperse an input spectrum into its various frequency components and vertical out of plane radiation was observed at wavelength dependant positions along the entire length of the waveguide. The experimental observation is corroborated by a brief theoretical analysis and simulation. These devices form the foundation for future work involving integration into a micro-spectrometer for eventual lab-on-chip use. 

DUAL WAVELENGTH HIGH POWER DOUBLE-CLAD ERBIUM/YTTERBIUM-DOPED FIBER LASER

2011 ◽  
Vol 20 (04) ◽  
pp. 443-451
Author(s):  
M. R. A. MOGHADDAM ◽  
S. W. HARUN ◽  
S. SHAHI ◽  
H. AHMAD
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
Wavelength Region ◽  
Dual Wavelength ◽  
Comb Filter ◽  
Mode Competition ◽  
Mode Suppression ◽  
Loop Mirror ◽  
Power Variance ◽  
Side Mode

A dual wavelength high power double-clad erbium/ytterbium-doped fiber laser with a narrowest spacing of 0.4 nm and a M2 value of close to unity is presented in the region of 1565 nm. This result can be realized with a significant improvement of the mode competition problem using a loop mirror as a comb filter. The wavelength region can also be varied using polarization controllers in the loop mirror. This dual-wavelength fiber laser with side mode suppression ratio (SMSR) of 40 dB is quite stable, and the output power variance is as low as 0.46 dB.

Controlling Weak Laser Beam to Nonlinear Focusing Based on Induced Nonlinear Effects

2013 ◽  
Vol 710 ◽  
pp. 385-389
Author(s):  
Feng Lin ◽  
Chao Tan ◽  
Yuan Zhou ◽  
Xi Quan Fu
Keyword(s):  
Analytical Solution ◽  
Theoretical Analysis ◽  
Laser Beam ◽  
High Power ◽  
Exact Analytical Solution ◽  
Nonlinear Effects ◽  
Pump Laser ◽  
High Power Laser ◽  
Power Laser ◽  
Nonlinear Focusing

In this paper, we theoretically and experimentally investigated the controllable nonlinear focusing of the weak laser based on the induced nonlinear effects. We obtained an exact analytical solution to the weak laser beam when the high power laser beam is unchangeable during propagation. We also discussed the different pump parameters how to influence the focusing and experimentally partly verify the theoretical analysis. The results show that the focusing of weaker beam was jointly controlled by the power, width and wavelength of pump laser.

Sign in / Sign up

Export Citation Format

Share Document