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  • CLEO/Europe and EQEC 2009 Conference Digest
  • (Optica Publishing Group, 2009),
  • paper PDA_3

First CEO beat frequency directly from a 1.5-μm Er:Yb:glass laser oscillator

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Abstract

Frequency combs from passively modelocked lasers offer a very stable link between optical and microwave frequencies that can directly be measured with very high accuracy. Currently, most frequency-comb generation systems are based on Ti:Sapphire lasers, which cannot be directly diode-pumped, or Er:fiber laser systems, which require further amplification and noise reduction techniques. SESAM modelocked diode-pumped solid-state lasers (DPSSLs) are a promising alternative for frequency comb generation. Their simple and stable design with high-Q cavities leads to low noise operation. Additionally, their pulse repetition rate can be increased to tens of GHz in low-noise fundamental modelocked operation [1]. So far carrier envelope offset (CEO) frequency detection of DPSSLs has been demonstrated with a Kerr-lens modelocked 865-nm Cr:LiSAF laser oscillator [2], and a fiber-amplified, temporally compressed 1030-nm Yb:KYW laser [3]. Here we present the first CEO beat frequency measurement of a passively modelocked 1.5-μm solid-state laser oscillator. The compact and highly efficient SESAM modelocked Er:Yb:glass laser is self-starting and operates at 75 MHz pulse repetition rate [4]. The laser is pumped by only one standard 980-nm telecom pump diode with an electrical power consumption of <1.5 W. Its 110 mW average output power in 175-fs pulses is sufficient to generate an octave-spanning supercontinuum without further amplification and a free-running CEO beat signal with 49 dB signal-to-noise ratio and only 3.6 kHz bandwidth, which is 17-times narrower than for fiber systems. The excellent beating signal substantially reduces the demands on the feedback loop for frequency comb stabilization.

© 2009 IEEE

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