Broadly tunable linewidth-invariant Raman Stokes comb for selective resonance photoionization

Echarri, Daniel T.; Chrysalidis, K.; Fedosseev, Valentin; Marsh, B. A.; Mildren, Richard P.; Olaizola, Santiago M.; Spence, David J.; Wilkins, S. G.

doi:10.1364/oe.384630

Cited by 16 publications

(9 citation statements)

References 26 publications

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“…The resulting Stokes pulses have non-Gaussian envelopes and a duration that is considerably shorter than the pump pulse. Such effect was experimentally observed also in [9].…”

Section: Widely Tunable Diamond Raman Laser Designsupporting

confidence: 64%

“…This laser source was characterized and tested for resonant ionization spectroscopy experiments, by exciting the atomic transition 4s 2 1 S 0 → 4s4p 1 P 0 1 of calcium at 422.79 nm. The Ca + isotopes were produced inside an atomic beam unit in cross-beam geometry, where a time-of-flight spectrometer was used to measure the ion signal [9]. The results showed that the technology has great potential to cope with the demanding requirements of resonantly exciting atomic transitions of different elements.…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that the technology has great potential to cope with the demanding requirements of resonantly exciting atomic transitions of different elements. A pivotal feature here is that the laser operates in what is called the "coherent Raman scattering regime", where the achievable Stokes linewidth is approximately the same as for the pumping light [9].…”

Section: Introductionmentioning

confidence: 99%

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Tunable diamond raman lasers for resonance photo-ionization and ion beam production

et al. 2022

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Lasers with wide tunability and tailored linewidth are key assets for spectroscopy research and applications. We show that diamond, when configured as a Raman laser, provides agile access to a broad range of wavelengths while being capable of efficient and selective photo-excitation of atomic species and suitable spectroscopic applications thanks to its narrow linewidth. We demonstrate the use of a compact diamond Raman laser capable of efficient ion beam production by resonance ionization of Sm isotopes in a hot metal cavity. The ionization efficiency was compared with a conventional Ti:sapphire laser operating at the same wavelength. Our results show that the overall ion current produced by the diamond Raman laser was comparable -or even superior in some cases-to that of the commonly used Ti:sapphire lasers. This demonstrates the photo-ionization capability of Raman lasers in the Doppler broadening-dominated regime, even with the considerable differences in their spectral properties. In order to theoretically corroborate the obtained data and with an eye on studying the most convenient spectral properties for photo-ionization experiments, we propose a simple excitation model that analyzes and compares the spectral overlap of the Raman and Ti:Sapphire lasers with the Doppler-broadened atomic spectral line. We demonstrate that Raman lasers are a suitable source for resonance photo-ionization applications in this regime.

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“…The resulting Stokes pulses have non-Gaussian envelopes and a duration that is considerably shorter than the pump pulse. Such effect was experimentally observed also in [9].…”

Section: Widely Tunable Diamond Raman Laser Designsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tunable diamond raman lasers for resonance photo-ionization and ion beam production

et al. 2022

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“…In terms of using the diamond bulk as a Raman laser material, its unique optical properties enabled the development of lasers operating over a wide spectrum due to its giant Raman frequency shift (1332 cm -1 ), large Raman gain (>40 cm/GW @ 532 nm) and ultra-wide transparency window (from DUV all the way to the THz, except for a lossy window from 2.6 -6 µm due to multiphonon-induced absorption [10][11][12][13][14][15]). Furthermore, the excellent thermal properties afforded by diamond (unsurpassed thermal conductivity of 1800 W/m/K at 300 K and low thermo-optic coefficient of the order of 10 -5 K -1 ) along with negligible birefringence [16] make it an ideal material for high-power Raman lasing with greatly reduced thermal lensing effects at the kW average power level [17].…”

Section: Measurement Principlementioning

confidence: 99%

The influence of phonon harmonicity on spectrally pure resonant Stokes fields

Stoikos,

Granados

2022

Preprint

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Thanks to their highly coherent emission and compact form factor, single axial mode diamond Raman lasers have been identified as a valuable asset for applications including integrated quantum technology, high resolution spectroscopy or coherent optical communications. While the fundamental emission linewidth of these lasers can be Fourier limited, their thermo-optic characteristics lead to drifts in their carrier frequency, posing important challenges for applications requiring ultra-stable emission. We propose here a method for measuring accurately the temperature-dependent index of refraction of diamond by employing standing Stokes waves produced in a monolithic Fabry-Pérot (FP) diamond Raman resonator. Our approach takes into account the influence of the temperature on the first-order phonon line and the average lattice phonon frequency under intense stimulated Raman scattering (SRS) conditions. We further utilize this model to calculate the temperaturedependent thermo-optic coefficient and the Grüneisen parameter of diamond in the visible spectral range. The theory is accompanied by the demonstration of tunable Fourier-limited Stokes nanosecond pulses with a stabilized center frequency deviation of less than <4 MHz.

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“…Carefully engineering the resonators to have high Q factors over a broad wavelength range is necessary if the Raman lasers were to have a wide tuning range at every resonant wavelength 24 . Widely tunable Raman lasers have been well demonstrated in diamond 25 – 28 , silica 29 , chalcogenide glass 30 , 31 , and aluminum nitride 32 devices. A wide tuning bandwidth of about 100 nm was realized in a single-mode racetrack microresonator fabricated on a diamond waveguide platform with a lasing threshold power of 85 mW 33 .…”

Section: Introductionmentioning

confidence: 99%

Broadband high-Q multimode silicon concentric racetrack resonators for widely tunable Raman lasers

et al. 2022

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Multimode silicon resonators with ultralow propagation losses for ultrahigh quality (Q) factors have been attracting attention recently. However, conventional multimode silicon resonators only have high Q factors at certain wavelengths because the Q factors are reduced at wavelengths where fundamental modes and higher-order modes are both near resonances. Here, by implementing a broadband pulley directional coupler and concentric racetracks, we present a broadband high-Q multimode silicon resonator with average loaded Q factors of 1.4 × 106 over a wavelength range of 440 nm (1240–1680 nm). The mutual coupling between the two multimode racetracks can lead to two supermodes that mitigate the reduction in Q factors caused by the mode coupling of the higher-order modes. Based on the broadband high-Q multimode resonator, we experimentally demonstrated a broadly tunable Raman silicon laser with over 516 nm wavelength tuning range (1325–1841 nm), a threshold power of (0.4 ± 0.1) mW and a slope efficiency of (8.5 ± 1.5) % at 25 V reverse bias.

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Broadly tunable linewidth-invariant Raman Stokes comb for selective resonance photoionization

Cited by 16 publications

References 26 publications

Tunable diamond raman lasers for resonance photo-ionization and ion beam production

Tunable diamond raman lasers for resonance photo-ionization and ion beam production

The influence of phonon harmonicity on spectrally pure resonant Stokes fields

Broadband high-Q multimode silicon concentric racetrack resonators for widely tunable Raman lasers

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