Numerical optimization of high-order volume-mode gyrotron cavities with respect to mode conversion and mode competition

2017 ◽  
Author(s):  
O. Dumbrajs
Keyword(s):  
Numerical Optimization ◽  
Mode Conversion ◽  
High Order ◽  
Mode Competition ◽  
Volume Mode

High-order optical vortex generation in a few-mode fiber via cascaded acoustically driven vector mode conversion

2016 ◽  
Vol 41 (21) ◽  
pp. 5082 ◽  
Author(s):  
Wending Zhang ◽  
Ligang Huang ◽  
Keyan Wei ◽  
Peng Li ◽  
Biqiang Jiang ◽  
...  
Keyword(s):  
Mode Conversion ◽  
Optical Vortex ◽  
High Order ◽  
Vortex Generation ◽  
Vector Mode

Pulsed high-order volume mode gyroklystron

2005 ◽  
Vol 48 (10-11) ◽  
pp. 737-740 ◽  
Author(s):  
N. I. Zaitsev ◽  
E. V. Ilyakov ◽  
S. V. Kuzikov ◽  
I. S. Kulagin ◽  
V. K. Lygin ◽  
...  
Keyword(s):  
High Order ◽  
Volume Mode

High-order mode conversion in a few-mode fiber via laser-inscribed long-period gratings at 155  µm and 2  µm wavebands

2020 ◽  
Vol 59 (34) ◽  
pp. 10688
Author(s):  
Xinyi Zhao ◽  
Yunhe Zhao ◽  
Yunqi Liu ◽  
Zuyao Liu ◽  
Chengbo Mou ◽  
...  
Keyword(s):  
Mode Conversion ◽  
High Order Mode ◽  
High Order ◽  
Order Mode ◽  
Long Period ◽  
Long Period Gratings

3 W average-power high-order mode pulse in dissipative soliton resonance mode-locked fiber laser

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Longtao Wang ◽  
Jiangtao Xu ◽  
Jiafeng Lu ◽  
Linping Teng ◽  
Zhengqian Luo ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Mode Conversion ◽  
Average Power ◽  
High Energy ◽  
Mode Locking ◽  
High Order ◽  
Dissipative Soliton ◽  
Fiber Grating ◽  
Soliton Resonance ◽  
Mode Field

Abstract Recently high-order modes (HOMs) lasers have been extensively investigated due to their potential applications in mode-division multiplexing. In this paper, we present two schemes of generating HOMs from the mode-locked fiber lasers (MLFLs) in the dissipative soliton resonance (DSR) regime. Watt-level HOM outputs are implemented through intra-cavity mode conversion. 3 W average-power HOMs with an efficiency slope of 25% can be obtained based on an MLFL in the DSR regime, which is achieved by incorporating a long-period fiber grating (LPFG) and a dual-resonant acoustically induced fiber grating (AIFG), respectively. Their different spectrum responses enable flexible mode conversion in the MLFLs. Both fiber mode converters are exploited to show their robust capability of efficient mode manipulation. The MLFL with an LPFG inserted in the cavity can achieve wide-bandwidth intra-cavity optical vortex beams (OVBs) near the dispersion turning around point because of the pulses of the fundamental mode and high-order vortex eigenmodes oscillating in the cavity with the same group velocity to form spatiotemporal mode locking. The MLFL based on a dual-resonant AIFG can perform the function of fast switching (∼0.3 ms) in LP01, LP11a, and LP11b modes with a high modal purity of 96%. These different modes with high-energy pulses can be flexibly switched with programmable radio frequency modulation. Furthermore, a quarter-wave plate and a polarizer are employed at the output of fiber laser to realize the controllability of the mode field, which is possible to generate a controllable mode field of OVBs based on the first-order Poincaré sphere. This control method can be integrated with the MLFLs to extend the flexibility of high-power HOMs generation.

scholarly journals Mode competition and startup in cylindrical cavity gyrotrons using high-order operating modes

1994 ◽  
Vol 22 (5) ◽  
pp. 850-860 ◽  
Author(s):  
D.R. Whaley ◽  
M.Q. Tran ◽  
T.M. Tran ◽  
T.M. Antonsen
Keyword(s):  
Cylindrical Cavity ◽  
High Order ◽  
Mode Competition ◽  
Operating Modes

scholarly journals Recent progress of dynamic mode manipulation via acousto-optic interactions in few-mode fiber lasers: mechanism, device and applications

Nanophotonics ◽  
2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Jiafeng Lu ◽  
Fan Shi ◽  
Jiangtao Xu ◽  
Linghao Meng ◽  
Longkun Zhang ◽  
...  
Keyword(s):  
Fiber Optics ◽  
Fiber Lasers ◽  
Mode Conversion ◽  
Spiral Wave ◽  
High Order ◽  
Mode Interaction ◽  
Mode Switching ◽  
Dynamic Mode ◽  
Spatial Mode ◽  
Mode Generation

AbstractThe burgeoning advances of spatial mode conversion in few-mode fibers emerge as the investigative hotspot in novel structured light manipulation, in that, high-order modes possess a novel fundamental signature of various intensity profiles and unique polarization distributions, especially orbital angular momentum modes carrying with phase singularity and spiral wave front. Thus, control of spatial mode generation becomes a crucial technique especially in fiber optics, which has been exploited to high capacity space division multiplexing. The acousto-optic interactions in few-mode fibers provide a potential solution to tackle the bottleneck of traditional spatial mode conversion devices. Acousto-optic mode conversion controlled by microwave signals brings tremendous new opportunities in spatial mode generation with fast mode tuning and dynamic switching capabilities. Besides, dynamic mode switching induced by acousto-optic effects contributes an energy modulation inside a laser cavity through nonlinear effects of multi-mode interaction, competition, which endows the fiber laser with new functions and leads to the exploration of new physical mechanism. In this review, we present the recent advances of controlling mode switch and generation employing acousto-optic interactions in few-mode fibers, which includes acousto-optic mechanisms, optical field manipulating devices and novel applications of spatial mode control especially in high-order mode fiber lasers.

Stable, Single-Mode Oscillation with High-Order Volume Mode at 1 MW, 170 GHz Gyrotron

1996 ◽  
Vol 65 (7) ◽  
pp. 1888-1890 ◽  
Author(s):  
Keishi Sakamoto ◽  
Atsushi Kasugai ◽  
Koji Takahashi ◽  
Masaki Tsuneoka ◽  
Tsuyoshi Imai ◽  
...  
Keyword(s):  
Single Mode ◽  
High Order ◽  
Mode Oscillation ◽  
Volume Mode

Design of a high order volume mode cavity for a l MW/140GHz gyrotron

1995 ◽  
Vol 78 (4) ◽  
pp. 771-787 ◽  
Author(s):  
G. GANTENBEIN ◽  
E. BORIE ◽  
O. DUMBRAJS ◽  
M. THUMM
Keyword(s):  
High Order ◽  
Volume Mode

Broadband high-order mode pass filter based on mode conversion

2017 ◽  
Vol 42 (18) ◽  
pp. 3686 ◽  
Author(s):  
Kazi Tanvir Ahmmed ◽  
Hau Ping Chan ◽  
Binghui Li
Keyword(s):  
Mode Conversion ◽  
High Order Mode ◽  
High Order ◽  
Order Mode ◽  
Pass Filter
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