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<p>A high-power 2-<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\mu\)</EquationSource> </InlineEquation>m phase-locked femtosecond source is demonstrated by a degenerate doubly resonant optical parametric oscillator (DROPO), which is synchronously pumped by a home-built Yb:YAG Kerr-lens mode-locked thin-disk laser. A dither-free scheme, incorporating an intracavity ’parasitic’ sum-frequency of signal and pump as an error signal, has been used to stabilize the DROPO at degeneracy. To our knowledge, with a pump power of 15.8&#xa0;W, this system achieves the highest output power (5.6&#xa0;W) and conversion efficiency (35&#xa0;%) for an actively stabilized, degenerate BBO-based DROPO operating at 2&#xa0;<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\mu\)</EquationSource> </InlineEquation>m. The long-term stability measurement of the power over 90 minutes shows a root mean square (RMS) power noise of 0.78%, demonstrating excellent stability and reliable performance.</p>

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High power ultrafast phase-locked laser at 2060 nm from a doubly resonant optical parametric oscillator

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  • 出版模式：

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  • 发表日期：

    2026年2月18日

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  • Han Rao,
  • Robin Mevert,
  • Fridolin Jakob Geesmann,
  • David Zuber,
  • Ayhan Demircan,
  • Ihar Babushkin,
  • Uwe Morgner

摘要

A high-power 2- \(\mu\) m phase-locked femtosecond source is demonstrated by a degenerate doubly resonant optical parametric oscillator (DROPO), which is synchronously pumped by a home-built Yb:YAG Kerr-lens mode-locked thin-disk laser. A dither-free scheme, incorporating an intracavity ’parasitic’ sum-frequency of signal and pump as an error signal, has been used to stabilize the DROPO at degeneracy. To our knowledge, with a pump power of 15.8 W, this system achieves the highest output power (5.6 W) and conversion efficiency (35 %) for an actively stabilized, degenerate BBO-based DROPO operating at 2  \(\mu\) m. The long-term stability measurement of the power over 90 minutes shows a root mean square (RMS) power noise of 0.78%, demonstrating excellent stability and reliable performance.