Abstract
A dual-off-axis pumping scheme is presented to generate wavelength-tunable high-order Hermite–Gaussian (HG) modes in lasers. The mode and wavelength can be actively controlled by the off-axis displacements and pump power. The purities of the output HG modes are quantified by intensity distributions and the measured values. The highest order reaches for stable mode, and wavelength-tunable width is about 10 nm. Moreover, through externally converting the modes, the vortex beams carrying orbital angular momentum (OAM) with a large OAM-tunable range from to are produced. This work is effective for largely scaling the spectral and OAM tunable ranges of optical vortex beams.
© 2018 Optical Society of America
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