Article

An ultra-bright two-photon source with a type-I bulk periodically poled potassium titanyl phosphate

Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, PR China
Optics Communications DOI:10.1016/j.optcom.2008.02.030

ABSTRACT We experimentally demonstrate an ultra-bright two-photon source with a type-I bulk periodically poled potassium titanyl phosphate. With the 390 nm cw laser from our home-made frequency doubler in a ring cavity as the pump, we detect about 340 k/s coincidence counts with a pump power of 0.11 mW in a Hanbury–Brown–Twiss-type experiment, which corresponds to the production rate of 94 MHz/mW with 40 nm bandwidth. With a 3 nm interference filter, we detect about 11.5 k/s coincidence counts with the same pump power, corresponding to the production rate of 4.3 MHz/mW/nm. This is very promising for many applications in quantum information field, such as transferring the information between a photon and an atomic system and so on.

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Keywords

11.5 k/s coincidence counts
 
3 nm interference filter
 
340 k/s coincidence counts
 
390 nm cw laser
 
40 nm bandwidth
 
atomic system
 
home-made frequency doubler
 
MHz/mW/nm
 
pump power
 
type-I bulk periodically poled potassium titanyl phosphate
 
ultra-bright two-photon source