Minelly, J.D., Taylor, E.R., Jedrzejewski, K.P., Wang, J. and Payne, D.N.
Laser-diode-pumped neodymium-doped fibre laser with output power in excess of 1 Watt
At CLEO '92: Conference on Lasers & Electro-Optics, United States.
01 May 1992.
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Fiber lasers are normally considered to be low-power devices and not competitive with diode-pumped Nd:YAG lasers. However, by employing special glass fiber technology and a novel inner-cladding geometry we demonstrate here a Nd3+-doped single-mode fiber laser emitting an output power of 1.07 W at a wavelength of 1.057 µm. The laser is pumped with a 3-W GaAAs multistripe laser diode array and has several advantages over its similarly pumped Nd:YAG counterpart. For example, the broad absorption line of Nd3+ in glass obviates the need for selection and temperature stabilization of the pump diode wavelength. The waveguide nature of the fiber resonator makes mirror alignment simple, eliminates thermal focusing, and ensures perfect transverse-mode selection. The laser cavity is therefore substantially immune from environmental effects. In addition, fiber lasers are broadly tunable and, by use of a variety of well-established fiber techniques, can give high-power Q-switched output, femtosecond mode-locked pulses, and narrow-linewidth operation.
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