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Lithium niobate whispering-gallery resonators (WGRs) show high intensity enhancement due to small mode volumes and high Q-factors. With bulk WGRs, shaped by diamond-blade-cutting tools followed by surface polishing, Q-factors in the range of 1011 have been demonstrated, which make them of significant interest for e.g. nonlinear-optical frequency conversion [1]. However, WGRs are still rare in commercial...
Yb:YAG thin-disk (TD) oscillators are able to deliver energetic femtosecond pulses without external amplification at hundreds of watts average power and MHz repetition rates [1, 2]. Such compact, high-power, low-noise sources are beneficial for scientific experiments and industrial micromachining. They also serve as a great starting point for spectral broadening, which allows transferring their power...
Frequency conversion from the telecom range into the visible is demonstrated in suspended GaN slab photonic crystal (PhC) cavities through second harmonic generation (SHG) and third harmonic generation (THG), under continuous-wave resonant excitation. PhC cavities based on L3 and H0 designs are implemented with embedded injectors, the latter shown in Fig. 1a, enabling improved coupling to the fundamental...
Using coherent photon conversion (CPC) we generate large effective X(2) nonlinearities in a X(3)-nonlinear Si3N4 microring-resonator and measure an effective second harmonic generation efficiency of 77%/mW.
Cavities have become a very important tool for scientific research and for industrial applications like lasers and detectors because of the outstanding ability of field enhancement that increases the light-matter interaction. Therefore a goal ever since was to increase the field enhancement by improving the mirrors of optical cavities. This research leaded to very good mirrors with a mirror loss of...
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