ABSTRACT This paper reports a new type of passive saturable absorber (SA) made of transition metal oxide (TMO) embedded in polyvinyl alcohol (PVA). The Tungsten trioxide (WO3)-PVA SA is placed in an erbium-doped fibre laser cavity to produce Q-switched pulses operating at 1562.82 nm. The pulse laser starts to manifest at the threshold pump power of 40 mW and continues to exist until the maximum pump power of 195 mW. Within that pump power range, its pulse energy, repetition rate and pulse width vary from 98 to 142.85 nJ, 29.86 to 56.7 kHz and 5.032 to 1.85 µs, respectively. The pulse train is stable with a signal to noise ratio of 70 dB. This is the first demonstration of a Q-switched laser using such a SA.

中文翻译：

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用于在铒激光器中产生调Q脉冲的三氧化钨（WO3）薄膜吸收剂

摘要本文报道了一种新型被动饱和吸收体（SA），由嵌入聚乙烯醇（PVA）中的过渡金属氧化物（TMO）制成。三氧化钨 (WO3)-PVA SA 被放置在掺铒光纤激光器腔中，以产生工作在 1562.82 nm 的调 Q 脉冲。脉冲激光在 40 mW 的阈值泵浦功率处开始出现并继续存在，直到最大泵浦功率 195 mW。在该泵浦功率范围内，其脉冲能量、重复率和脉冲宽度分别从 98 到 142.85 nJ、29.86 到 56.7 kHz 和 5.032 到 1.85 µs 不等。脉冲序列稳定，信噪比为 70 dB。这是使用这种 SA 的 Q 开关激光器的首次演示。