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工作在2μm波段的脉冲掺铥光纤激光器,可望在遥感探测、相干雷达、空间光通信、激光医疗和特种材料加工等领域获得重要应用。目前,利用波长在1.55μm附近的脉冲掺铒光纤激光器作泵浦源的增益开关掺铥光纤激光器是实现全光纤结构纳秒脉冲掺铥光纤激光器的理想方式之一。采用实验研发的纳秒脉冲掺铒激光器作种子源,研制了全光纤MOPA(masteroscillator power amplifier)结构的纳秒脉冲掺铒光纤激光器,输出波长1 547 nm,脉冲频率100 kHz,脉冲宽度50 ns,平均功率1 W,单脉冲能量10μJ。使用该脉冲掺铒光纤激光器抽运掺铥光纤,实现了波长1 963 nm的增益开关脉冲激光输出。该掺铥光纤激光器为全光纤结构,重复频率100 kHz,最小脉宽47 ns,最大单脉冲能量100 nJ。激光输出稳定可靠,更高的单脉冲能量,平均功率和峰值功率可由进一步级联光纤放大器实现。
Pulse doped 铥 fiber lasers operating in the 2μm band are expected to gain important applications in such areas as telemetry, coherent radar, space optical communications, laser medical and specialty materials processing. At present, the use of pulsed Erbium-doped fiber lasers with a wavelength of about 1.55μm as pump-source gain switching fiber-doped lasers is one of the ideal ways to achieve full-fiber nanosecond-pulsed fiber lasers. A nanosecond pulsed erbium-doped fiber laser with a full-fiber MOPA (master oscillator) power amplifier structure was developed by experimentally developing a nanosecond-erbium-doped erbium-doped laser with an output wavelength of 1 547 nm, a pulse frequency of 100 kHz and a pulse width of 50 ns. Average power 1 W, single pulse energy 10μJ. The pulsed erbium-doped fiber laser is used to pump doped 铥 optical fiber to achieve a gain switching pulse laser output with a wavelength of 1 963 nm. The doped 铥 fiber laser is an all-fiber structure with a repetition frequency of 100 kHz, a minimum pulse width of 47 ns and a maximum single pulse energy of 100 nJ. Stable and reliable laser output, higher single-pulse energy, average power and peak power can be further cascaded fiber amplifier to achieve.