Cavity-enhanced sum-frequency generation of blue light with near-unity conversion efficiency

Abstract

We report on double-resonant highly efficient sum-frequency generation in the blue range. The system consists of a 10-mm-long periodically poled KTP crystal placed in a double-resonant bow-tie cavity and pumped by a fiber laser at 1064.5 nm and a Ti:sapphire laser at 849.2 nm. An optical power of 375 mW at 472.4 nm in a TEM${}_{00}$ mode was generated with pump powers of 250 mW at 849.2 nm and 200 mW at 1064.5 nm coupled into the double-resonant ring resonator with 88$\%$ mode-matching. The resulting internal conversion efficiency of 95($\pm 3$)$\%$ of the photons mode-matched to the cavity constitutes, to the best of our knowledge, the highest overall achieved quantum conversion efficiency using continuous-wave pumping. Very high conversion efficiency is rendered possible due to very low intracavity loss on the level of 0.3$\%$ and high nonlinear conversion coefficient up to 0.045(0.015) W${}^{-1}$. Power stability measurements performed over one hour show a stability of 0.8$\%$. The generated blue light can be tuned within 5 nm around the center wavelength of 472.4 nm, limited by the phase-matching of our nonlinear crystal. This can however be expanded to cover the entire blue spectrum (420 nm to 510 nm) by proper choice of nonlinear crystals and pump lasers. Our experimental results agree very well with analytical and numerical simulations taking into account cavity impedance matching and depletion of the pump fields.

arXiv comment9 pages, 5 figures

References in corpus (8)

• A photonic quantum information interface
• Quantum State Engineering and Precision Metrology using State-Insensitive Light Traps
• Highly efficient frequency conversion with bandwidth compression of quantum light
• Sum-frequency generation of 589 nm light with near-unit efficiency
• Overcoming the SQL in gravitational wave detectors using spin systems with negative effective mass
• High-efficiency frequency doubling of continuous-wave laser light
• Generation of Polarization Squeezing with Periodically Poled KTP at 1064 nm
• Efficient 525nm laser generation in single or double resonant cavity

Cited by in corpus (1)

• Efficient single-photon pair generation by spontaneous parametric down-conversion in nonlinear plasmonic metasurfaces