Zhang Huicong, Zhou Tao, Shou Qian, Guo Qi
Opt Express. 2022 Mar 14;30(6):9336-9347. doi: 10.1364/OE.448451.
We investigate the propagation dynamics of elliptic Gaussian breathers without and with orbital angular momentum (OAM) in thermal nonlocal nonlinear media with both linear and nonlinear isotropy. The beamwidths and intensity of the elliptic breather without OAM, and the beamwidths and rotation angle of the elliptic breather with the critical OAM are analytically discussed in details. In experiment, the OAM-free elliptic beam is observed to oscillate and cannot form an elliptic soliton for any input power. By contrast, the elliptic beam carrying the critical OAM can keep its ellipticity changeless during the propagation and evolve into a spiralling elliptic soliton at the critical power. Specifically, in the vicinity of the critical power, the rotation angle of the spiralling elliptic beam can be controlled linearly by the input power and exceed π/2, while its beamwidths and ellipticity remain unchanged. Such a power-controllable, profile-preserving spiralling elliptic beam may provide potential applications in all-optical manipulation.
我们研究了在具有线性和非线性各向同性的热非局部非线性介质中，无轨道角动量（OAM）和有轨道角动量的椭圆高斯呼吸子的传播动力学。详细地解析讨论了无OAM椭圆呼吸子的束宽和强度，以及具有临界OAM的椭圆呼吸子的束宽和旋转角度。在实验中，观察到无OAM的椭圆光束会振荡，并且对于任何输入功率都无法形成椭圆孤子。相比之下，携带临界OAM的椭圆光束在传播过程中可以保持其椭圆率不变，并在临界功率下演变成螺旋椭圆孤子。具体而言，在临界功率附近，螺旋椭圆光束的旋转角度可以由输入功率线性控制并超过π/2，而其束宽和椭圆率保持不变。这种功率可控的螺旋椭圆光束可能在全光操纵中提供潜在应用。
