Abstract
The development of a neutral strontium optical frequency standard requires a high power source of blue laser radiation at 461 nm in order to laser cool the largest possible number of atoms. Unfortunately there are no readily available compact solid state laser systems that meets this requirement. One solution is to frequency double a high power 922 nm diode laser using a KNbO3 nonlinear crystal in a resonant cavity.1 However such diode lasers are not common, and the thermal effects associated with KNbO3 limits the output power. To overcome these problems we propose a novel design using doubly resonant sum frequency generation of a high power Nd:YAG laser at 1064 nm and a medium power diode laser at 813 nm. Both lasers are readily available as standard commercial products, while KTP crystal is much less sensitive to thermal effects and still rather efficient as a nonlinear crystal. A similar system based on sum frequency generation in a monolithic non-critically phase matched KTP resonator has been demonstrated before, yielding 4 mW of blue light.2
© 2002 Optical Society of America
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