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

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

doi:10.1038/s41598-026-40002-x

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

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

Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (MBI)

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Abstract

A high-power 2-μm 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 μm. 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.

Originalsprache	Englisch
Aufsatznummer	7169
Fachzeitschrift	Scientific reports
Jahrgang	16
Ausgabenummer	1
DOIs	https://doi.org/10.1038/s41598-026-40002-x
Publikationsstatus	Veröffentlicht - 18 Feb. 2026

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abstract = "A high-power 2-μm 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 μm. 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.",

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AU - Mevert, Robin

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AU - Zuber, David

AU - Demircan, Ayhan

AU - Babushkin, Ihar

AU - Morgner, Uwe

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