Efficient nonlinear generation of high power, higher order, ultrafast "perfect" vortices in green

被引:41
作者
Chaitanya, N. Apurv [1 ,2 ]
Jabir, M. V. [1 ]
Samanta, G. K. [1 ]
机构
[1] Phys Res Lab, Phys Sci Lab, Ahmadabad 380009, Gujarat, India
[2] Indian Inst Technol Gandhinagar, Ahmadabad 382424, Gujarat, India
关键词
ORBITAL ANGULAR-MOMENTUM; DOWN-CONVERTED PHOTONS; OPTICAL VORTEX; 2ND-HARMONIC GENERATION; PARAMETRIC OSCILLATOR; TRANSFORMATION; MODES; LIGHT;
D O I
10.1364/OL.41.001348
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We report on efficient nonlinear generation of ultrafast, higher order "perfect" vortices at the green wavelength. Based on Fourier transformation of the higher order Bessel-Gauss (BG) beam generated through the combination of the spiral phase plate and axicon, we have transformed the Gaussian beam of the ultrafast Yb-fiber laser at 1060 nm into perfect vortices of power 4.4 W and order up to 6. Using single-pass second-harmonic generation (SHG) of such vortices in 5 mm long chirped MgO-doped, periodically poled congruent LiNbO3 crystal, we have generated perfect vortices at green wavelength (530 nm) with output power of 1.2 W and vortex order up to 12 at a singlepass conversion efficiency of 27%, independent of the orders. This is the highest single-pass SHG efficiency of any optical beams other than Gaussian beams. Unlike the disintegration of higher order vortices due to spatial walk-off effect in birefringent crystals, here, the use of the quasiphase-matching process enables generation of high-quality vortices, even at higher orders. The green perfect vortices of all orders have temporal and spectral widths of 507 fs and 1.9 nm, respectively, corresponding to a time-bandwidth product of 1.02. (C) 2016 Optical Society of America
引用
收藏
页码:1348 / 1351
页数:4
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