Near-concentric optical cavities of spherical mirrors can provide technical advantages over the conventional near-planar cavities in applications requiring strong atom-light interaction, as they concentrate light in a very small region of space. However, such cavities barely support stable optical modes, and thus impose practical challenges. Here, we present an experiment where we maintain a near-concentric cavity at its last resonant length for laser light at 780 nm resonant with an atomic transition. At this point, the spacing of two spherical mirror surfaces is $207(13)\phantom{\rule{0.16em}{0ex}}\mathrm{nm}$ shorter than the critical concentric point, corresponding to a stability parameter $g=\ensuremath{-}0.999962(2)$ and a cavity beam waist of $2.4\phantom{\rule{0.16em}{0ex}}\ensuremath{\mu}\mathrm{m}$.Near-concentric optical cavities of spherical mirrors can provide technical advantages over the conventional near-planar cavities in applications requiring strong atom-light interaction, as they concentrate light in a very small region of space. However, such cavities barely support stable optical modes, and thus impose practical challenges. Here, we present an experiment where we maintain a near-concentric cavity at its last resonant length for laser light at 780 nm resonant with an atomic transition. At this point, the spacing of two spherical mirror surfaces is $207(13)\phantom{\rule{0.16em}{0ex}}\mathrm{nm}$ shorter than the critical concentric point, corresponding to a stability parameter $g=\ensuremath{-}0.999962(2)$ and a cavity beam waist of $2.4\phantom{\rule{0.16em}{0ex}}\ensuremath{\mu}\mathrm{m}$.

arXiv:1806.03038Physical Review ADec 21, 201820 citations

Modern Challenges in Quantum Optics

Miguel Orszag, J. C. Retamal

Lecture notes in physicsJan 1, 200113 citations

Coupling light to higher order transverse modes of a near-concentric optical cavity

Adrian Nugraha Utama, Chang Hoong Chow, Chi Huan Nguyen +1 more

Optical cavities in the near-concentric regime have near-degenerate transverse modes; the tight focusing transverse modes in this regime enable strong coupling with atoms. These features provide an interesting platform to explore multi-mode interaction between atoms and light. Here, we use a spatial light modulator (SLM) to shape the phase of an incoming light beam to match several Laguerre-Gaussian (LG) modes of a near-concentric optical cavity. We demonstrate coupling efficiency close to the theoretical prediction for single LG modes and well-defined combinations of them, limited mainly by imperfections in the cavity alignment.Optical cavities in the near-concentric regime have near-degenerate transverse modes; the tight focusing transverse modes in this regime enable strong coupling with atoms. These features provide an interesting platform to explore multi-mode interaction between atoms and light. Here, we use a spatial light modulator (SLM) to shape the phase of an incoming light beam to match several Laguerre-Gaussian (LG) modes of a near-concentric optical cavity. We demonstrate coupling efficiency close to the theoretical prediction for single LG modes and well-defined combinations of them, limited mainly by imperfections in the cavity alignment.

arXiv:2010.14216Optics ExpressFeb 17, 20217 citations

Theoretical developments in cavity quantum optics: a brief review

Pierre Meystre

Physics ReportsOct 1, 199248 citations

Low noise near-concentric optical cavity design

Florentin Adam, Wen Xin Chiew, Adrian Nugraha Utama +1 more

Near-concentric cavities are excellent tools for enhancing an atom-light interaction as they combine a small mode volume with a large optical access for atom manipulation. However, they are sensitive to longitudinal and transverse misalignments. To address this sensitivity, we present a compact near-concentric optical cavity system with a residual cavity length variation δLC,rms = 0.36(2) Å. A key part of this system is a cage-like tensegrity mirror support structure that allows us to correct for longitudinal and transverse misalignments. The system is stable enough to allow the use of mirrors with a higher cavity finesse to enhance the atom-light coupling strength in cavity-QED applications.Near-concentric cavities are excellent tools for enhancing an atom-light interaction as they combine a small mode volume with a large optical access for atom manipulation. However, they are sensitive to longitudinal and transverse misalignments. To address this sensitivity, we present a compact near-concentric optical cavity system with a residual cavity length variation δLC,rms = 0.36(2) Å. A key part of this system is a cage-like tensegrity mirror support structure that allows us to correct for longitudinal and transverse misalignments. The system is stable enough to allow the use of mirrors with a higher cavity finesse to enhance the atom-light coupling strength in cavity-QED applications.

arXiv:2312.04888Review of Scientific InstrumentsApr 1, 20240 citations

Recent Developments in Quantum Optics

Ramarao Inguva

Springer eBooksJan 1, 199331 citations

207(13)\phantom{\rule{0.16em}{0ex}}\mathrm{nm}

shorter than the critical concentric point, corresponding to a stability parameter $g=\ensuremath{-}0.999962(2)$ and a cavity beam waist of $2.4\phantom{\rule{0.16em}{0ex}}\ensuremath{\mu}\mathrm{m}$.