Abstract
We present the design of a novel platform that is able to combine optical frequency bands spanning 4.2 octaves from ultraviolet to mid-wave infrared into a single, low M2 output waveguide. We present the design and realization of a key component in this platform that combines the wavelength bands of 350 nm - 1500 nm and 1500 nm - 6500 nm with demonstrated efficiency greater than 90% in near-infrared and mid-wave infrared. The multi-octave spectral beam combiner concept is realized using an integrated platform with silicon nitride waveguides and silicon waveguides. Simulated bandwidth is shown to be over four octaves, and measured bandwidth is shown over two octaves, limited by the availability of sources.
Highlights
Integrated spectral beam combining technologies for high power broadband light sources enable technologies such as integrated spectroscopy systems [1,2] and wide-band wavelength division multiplexing [3]
We show low insertion loss spectral beam combining for wavelengths spanning more than two octaves
2.3 Ultra-broadband combiner beam propagation method (BPM) transmission simulations In Fig. 6 we show simulation trends we have obtained with BPM simulation software for fundamental mode transmission as a function of wavelength and coupler length
Summary
Integrated spectral beam combining technologies for high power broadband light sources enable technologies such as integrated spectroscopy systems [1,2] and wide-band wavelength division multiplexing [3]. Current competitive technologies for high power broadband sources with low M2 output use supercontinuum generation [5] or spectral beam combining [6]. Supercontinuum generation requires a high power pump to generate output through nonlinear processes. Such sources have output power and bandwidth limited by the pump power and require components that are challenging to integrate. Existing spectral beam combining technologies use free space optics to externally combine laser array output beams [7], but only narrow bandwidths are achieved. To cover multi-octave bandwidths, separate discrete laser sources are used [8]
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