We demonstrate a method for increasing the amount of power available for laser cooling applications by using a multimode optical fiber. Through randomization of phase shifts of modes within the fiber on time scales faster than the center-of-mass response time of the atoms, a smooth time-averaged trapping beam is generated. The principle has been demonstrated in a pyramidal magneto-optical trap. The method is particularly suitable for the harnessing of the high output power of broad-area diode lasers for laser cooling.
© 2005 Optical Society of America
Alexander P. Povilus, Spencer E. Olson, Rahul R. Mhaskar, Boon-Keng Teo, Jeffrey R. Guest, and Georg Raithel, "Time averaging of multimode optical fiber output for a magneto-optical trap," J. Opt. Soc. Am. B 22, 311-314 (2005)