Large deflection angle, high-power adaptive fiber optics collimator with preserved near-diffraction-limited beam quality

We report on the development of a monolithic adaptive fiber optics collimator, with a large deflection angle and preserved near-diffraction-limited beam quality, that has been tested at a maximal output power at the 300 W level. Additionally, a new measurement method of beam quality (M-2 factor) is developed. Experimental results show that the deflection angle of the collimated beam is in the range of 0-0.27 mrad in the X direction and 0-0.19 mrad in the Y direction. The effective working frequency of the device is about 710 Hz. By employing the new measurement method of the M-2 factor, we calculate that the beam quality is M-x(2) = 1.35 and M-y(2) = 1.24, which is in agreement with the result from the beam propagation analyzer and is preserved well with the increasing output power. (C) 2016 Optical Society of America