Abstract

To expand the span of the optical frequency comb (OFC), we generated the second harmonics of an OFC at $1.55 \mu \mathrm{m}$, using a multiperiod periodically poled lithium niobate (PPLN) crystal. A coupled-cavity OFC generator with an average output power of 0.2 mW was amplified and expanded with a fiber amplifier and a dispersion-flattened fiber. The fundamental OFC average power and span were 100 mW and 45 THz, respectively. The second-harmonic comb's span was 3.2 THz; however, we tuned the center frequency over 30 THz by changing the poling period. We also demonstrated that the second-harmonic comb can be used for frequency-difference measurement.

© 1999 Optical Society of America

Periodically poled potassium niobate for second-harmonic generation at 463 nm

J.-P. Meyn, M. E. Klein, D. Woll, R. Wallenstein, and D. Rytz
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Highly efficient second-harmonic and sum-frequency generation of nanosecond pulses in a cascaded erbium-doped fiber:periodically poled lithium niobate source

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Continuous-wave quasi-phase-matched generation of 60 mW at 465 nm by single-pass frequency doubling of a laser diode in backswitch-poled lithium niobate

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Engineerable compression of ultrashort pulses by use of second-harmonic generation in chirped-period-poled lithium niobate

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Second-harmonic generation in a direct-bonded periodically poled LiNbO₃ buried waveguide

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