Short Course Description:
Optical parametric oscillators (OPOs) based on c(2) nonlinear interaction are now firmly established as viable and versatile sources of widely tunable coherent radiation in difficult spectral regions inaccessible to lasers . They are capable of delivering tunable radiation in all temporal domains from the continuous-wave (cw) to the ultrafast femtosecond time-scales [2,3], and can provide unprecedented optical powers at high conversion efficiency in excellent temporal, spectral, spatial beam quality. The development of novel nonlinear materials and the steady progress in pump laser technology, combined with the application of innovative device architectures, novel resonance and pumping schemes, have led to major advances in OPOs over the past decade. The development of new birefringent nonlinear crystals such as BiB3O6 and CdSiP2, the advent of quasi-phase-matched (QPM) materials such as MgO:PPLN, MgO:sPPLT, OP-GaP and OP-GaAs, the rapid progress in Yb-fiber laser technology in cw and ultrafast time-scales, and further advances in the ultrafast Ti:sapphire and other solid-state and femtosecond lasers, have had an unprecedented impact on OPOs and their advancement to new spectral and temporal limits. Combined with the application of innovative cascaded pumping and frequency up- and down-conversion schemes, these developments have led to major new breakthroughs in OPOs, and have led the realization of a new generation of tunable coherent light sources based on nonlinear frequency conversion that can now cover spectral regions from the ~250 nm in UV to ~14 mm in deep-IR, and can operate from cw to a few-cycle time-scales.
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Short Course Benefits:
This short course provides an overview of c(2) OPOs, covering topics from basic operation principles to advanced devices. The course will begin with a description of the fundamental concepts in nonlinear optics and frequency conversion, followed by a discussion of OPO devices, an overview of the latest advances in OPO technology and applications. The discussion will cover OPOs operating in all temporal regimes, from the cw to the ultrafast femtosecond time-scales. Specifically, course participants will gain knowledge of the basic principles of nonlinear frequency conversion and optical parametric generation; phase-matching, amplification and tuning; OPO design issues, including nonlinear material and pump laser selection criteria; OPO operation in different time-scales, generic device architectures, pumping and resonance configurations; cw OPOs: singly-resonant, pump-enhanced, doubly- and triply-resonant oscillators, pump power threshold and frequency behavior, frequency tuning and control, solid-state, fiber and semicondcutor disk laser pumping, visible to mid-IR generation, novel device architectures; pulsed OPOs: operating principle, threshold condition, compact all-solid-state oscillators, high-energy and low-energy devices, single-mode operation, UV to mid-IR and THz generation; synchronously-pumped OPOs: picosecond OPOs: high-repetition-rate cw and pulsed oscillators, solid-state, Ti:sapphire and fiber laser pumping, birefringent and QPM devices, UV to mid-IR generation; femtosecond OPOs: Ti:sapphire, solid-state and fiber-pumped devices, collinear and noncollinear pumping, birefringent and QPM oscillators, spectral and temporal control, UV to mid-IR generation; integrated waveguide and microcavity OPOs, applications of OPO devices in spectroscopy, trace gas sensing, imaging, frequency synthesis and comb generation; commercial developments in OPO technology.
Short Course Audience:
Majid Ebrahim-Zadeh is an ICREA Professor at ICFO, Barcelona, Spain. He has been active in the advancement of OPOs for over 30 years and his research has spanned parametric sources from the UV to mid-IR, and in all time-scales from continuous-wave to ultrafast picosecond and few-cycle femtosecond domain. He has published more than 620 peer-reviewed articles, including 220 journal papers, over 110 invited, keynote and plenary talks and 14 post-deadline papers at major international conferences. He has been a regular instructor of the short course on OPOs at CLEO/USA (1996-2010) and CLEO/Europe (2007-2023). He is recipient of several honors and awards, including Innova Prize (2004), Berthold Leibinger Innovation Prize (2010) and David Richardson Medal of Optica (2021). He is a Fellow of Optica and SPIE.