A 1.<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e120" altimg="si13.svg"><mml:mrow><mml:mn>9</mml:mn><mml:mspace width="1em" class="nbsp"/><mml:mi mathvariant="normal">μ</mml:mi><mml:mi mathvariant="normal">m</mml:mi></mml:mrow></mml:math> Tm: YLF external cavity mode conversion vortex laser based on LD off-axis pump

Jingliang Liu, Jingquan Lin, Xinyu Chen, Yongji Yu, Chunting Wu, Guangyong Jin