期刊
OPTICS EXPRESS
卷 23, 期 12, 页码 15440-15451出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.23.015440
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资金
- technology and cleanroom facility FIRST of ETH Zurich for advanced micro- and nanotechnology
- ETH grant
- Swiss Innovation Promotion Agency [17137.1 PFMN-NM]
- Air-Force Office of Scientific Research [FA9550-12-1-0377]
- National Science Foundation (NSF) [ECS-0335765]
We present the first direct carrier-envelope-offset (CEO) frequency detection of a modelocked laser based on supercontinuum generation (SCG) in a CMOS-compatible silicon nitride (Si3N4) waveguide. With a coherent supercontinuum spanning more than 1.5 octaves from visible to beyond telecommunication wavelengths, we achieve self-referencing of SESAM modelocked diode-pumped Yb:CALGO lasers using standard f-to-2f interferometry. We directly obtain without amplification strong CEO beat signals for both a 100-MHz and 1-GHz pulse repetition rate laser. High signal-to-noise ratios (SNR) of > 25 dB and even > 30 dB have been generated with only 30 pJ and 36 pJ of coupled pulse energy from the megahertz and gigahertz laser respectively. We compare these results to self-referencing using a commercial photonic crystal fiber and find that the required peak power for CEO beat detection with a comparable SNR is lowered by more than an order of magnitude when using a Si3N4 waveguide. (C) 2015 Optical Society of America
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