Details

Autor(en) / Beteiligte

• Shen, Yijie
• Meng, Yuan
• Fu, Xing
• Gong, Mali

Titel

Wavelength-tunable Hermite-Gaussian modes and an orbital-angular-momentum-tunable vortex beam in a dual-off-axis pumped Yb:CALGO laser

Ist Teil von

• Optics letters, 2018-01, Vol.43 (2), p.291-294

Ort / Verlag

United States

Erscheinungsjahr

2018

Quelle

Optica Publishing Group Journals

Beschreibungen/Notizen

• A dual-off-axis pumping scheme is presented to generate wavelength-tunable high-order Hermite-Gaussian (HG) modes in Yb:CaGdAlO 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 M values. The highest order reaches m=15 for stable HG mode, and wavelength-tunable width is about 10 nm. Moreover, through externally converting the HG modes, the vortex beams carrying orbital angular momentum (OAM) with a large OAM-tunable range from ±1ℏ to ±15ℏ are produced. This work is effective for largely scaling the spectral and OAM tunable ranges of optical vortex beams.