Abstract
The current slack in the application of periodically poled materials for Watts-power range frequency-up conversion in the visible is clearly related to fundamental material issues like strong photorefraction, visible-induced infrared absorption, thermal loading, and gray-tracking (PPKTP)1,2 which result in the reduction of the optical damage threshold of the ferroelectric material and lower the efficiency of the quasi-phase- matched nonlinear conversion. These effects significantly scale down in the red and near-infrared, Recently we demonstrated encouraging results on the generation of 6 W average power at 770 nm using high power, seeded erbium sources and second harmonic generation (SHG) in PPKTP.3 The high power, seeded, erbium and ytterbium fiber sources combine several characteristics crucial for the development of a new generation of visible sources based on efficient quasi-phase-matched frequency-up conversion. They are capable of delivering variable temporal and spectral format optical pulses with up 1 kW peak and 10-15 W average powers; offer a fiber- delivered output with M ’ values under 1.05; combine hands-free, compact and efficient format with unprecedented life-time span of over 10b hrs. One particularly promising feature is the natural ability of these sources to be synchronously seeded and, as a result, a possibility to arrange the frequency-up conversion in the red by using efficient sum frequency generation (SFG) in periodically poled materials.
© 2002 Optical Society of America
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