Research Progress of Sub-500 fs 2 μm Fiber Laser Oscillator(Invited)
The 2 μm wavelength ultrafast laser,with its short duration,high peak power,wide spectral range,and compatibility with the atmospheric window,has found extensive applications in various fields including biomed-icine,laser radar and non-metallic material processing,among others.Utilizing a fiber mode-locked oscillator to generate the 2 μm wavelength ultrafast laser offers a direct and straightforward technology,boasting advantages such as a compact structure,high beam quality and low cost.However,there have been limited reports on sub-500 fs 2 μm wavelength fiber laser oscillators.A comprehensive review of the research progress in sub-500 fs fiber oscilla-tors within the 2 μm wavelength range is provided,utilizing both conventional soliton and dispersion-managed soli-ton mode-locking methods.Additionally,the key technologies for achieving sub-500 fs pulse width 2 μm ultrafast lasers are summarized.An outlook on the future development of 2 μm ultrafast fiber oscillators is presented,taking into account the specific requirements of different application fields.
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