Abstract
Actively Q-switched laser operation of a narrow linewidth compact fiber laser based on an Er–Yb double-clad fiber is presented. The laser linewidth as a function of the repetition rate and the Q-switched pulses characteristics for different pump powers are experimentally analyzed. Stable Q-switched laser operation with spectral laser linewidth of 73 pm in a repetition rate range from 90 to 270 kHz is obtained. The minimum pulse duration of 178 ns, maximum peak power of 30.5 W, and maximum pulse energy of 5.4 µJ are observed. The maximum average power reached is 1.1 W.
Highlights
In recent years, fiber lasers operating in the 1550 nm wavelength region are widely studied because of their properties such as high gain, eye-safe laser emission, and single-mode operation, among others [1,2,3]
With the maximal pump power applied of 7.7 W, the Q-switched laser generates stable pulses in a repetition rate range from 90 to
Summary
Fiber lasers operating in the 1550 nm wavelength region are widely studied because of their properties such as high gain, eye-safe laser emission, and single-mode operation, among others [1,2,3]. Since Erbium/Ytterbium double cladding fiber (EYDCF) came out, different approaches of fiber lasers were reported in order to reach high efficiency and high power emission [4,5,6] In this regard, Q-switched EYDCF lasers (EYDCFL) have been of increasing interest for applications in which short pulses (a few nanoseconds) with high peak power and high pulse energies are required. The passive Q-switching is based on the use of a saturable absorber such as fiber with graphene or carbon nanotube deposits [7,8,9,10,11] and un-pumped segments of active fiber [12,13] In this case, the repetition rate of the generated pulses is determined by the pump power which limits the controlling of the laser pulses characteristics and the output power reached.
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