We demonstrate a nanosecond pulsed 743 nm source through second-harmonic generation of a cascaded phosphosilicate Raman fiber amplifier system operating at 1485 nm. The amplifier is pumped by a 1240 nm phosphosilicate Raman fiber amplifier and seeded with a continuous-wave 1485 nm diode. This 1485 nm light is used for second-harmonic generation in periodically poled lithium niobate. Greater than 1 W of average power is generated at 743 nm with a corresponding pulse energy of 220 nJ at a repetition rate of 5 MHz. The source displays excellent beam quality (M$^2_{x,y}~\leq$ 1.18) with ideal parameters for biomedical imaging applications.

中文翻译：

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通过级联磷硅酸盐拉曼光纤放大器的二次谐波产生的瓦特级 743 nm 光源

我们通过在 1485 nm 下运行的级联磷硅酸盐拉曼光纤放大器系统的二次谐波生成演示了纳秒脉冲 743 nm 源。该放大器由 1240 nm 磷硅酸盐拉曼光纤放大器泵浦，并以 1485 nm 连续波二极管作为种子。这种 1485 nm 的光用于在周期性极化的铌酸锂中产生二次谐波。在 743 nm 处产生大于 1 W 的平均功率，相应的脉冲能量为 220 nJ，重复率为 5 MHz。该光源显示出出色的光束质量 (M $^2_{x,y}~\leq$ 1.18)，具有生物医学成像应用的理想参数。