A new method for spatial mode shifting of stabilized optical cavities for the generation of dual-color X-rays

Suerra, Edoardo; Giannotti, Dario; Canella, Francesco; Drebot, I.; Capra, S.; Cipriani, Daniele; Mettivier, Giovanni; Galzerano, G.; Cardarelli, P.; Cialdi, S.; Serafini, L.

doi:10.1016/j.nima.2021.165852

Cited by 8 publications

(3 citation statements)

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“…The focusing needed for increasing the luminosity of the process is provided by the mirrors surrounding the IP. This configuration is quite usual in Thomson/Compton sources based on lasers in Fabry-Peròt cavities [20,23,24]. In addition, L rt = n∆l (n integer), ∆l being the electron bunch-to bunch inter-distance.…”

Section: Double Source Constituted By a Thz Fel Oscillator And A Thom...mentioning

confidence: 99%

“…The mirrors are spherical and constitute a telescopic system, surrounding the Compton IP, which provides the focusing needed for increasing the luminosity of the system. This cavity has been inspired by those currently used in Thomson scattering sources, for instance in BriXSinO [23] or ThomX [24]. Other solutions could, however, be exploited.…”

Section: The Terahertz Optical Cavitymentioning

confidence: 99%

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Synchronised TeraHertz Radiation and Soft X-rays Produced in a FEL Oscillator

et al. 2022

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We present a scheme to generate synchronised THz and soft X-ray radiation pulses by using a free-electron laser oscillator driven by a high repetition rate (of order 10–100 MHz) energy recovery linac. The backward THz radiation in the oscillator cavity interacts with a successive electron bunch, thus producing few 105 soft/hard X-ray photons per shot (namely 1012–1013 photons/s) via Thomson/Compton back-scattering, synchronised with the mJ-class THz pulse within the temporal jitter of electron beams accelerated in the superconducting cavities of the linac (less than 100 fs). Detailed simulations have been performed in order to assess the capability of the scheme for typical wavelengths of interest, between 10 and 50 μm for the TeraHertz radiation and 0.5–3 nm for the X-rays.

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Section: Double Source Constituted By a Thz Fel Oscillator And A Thom...mentioning

confidence: 99%

Section: The Terahertz Optical Cavitymentioning

confidence: 99%

Synchronised TeraHertz Radiation and Soft X-rays Produced in a FEL Oscillator

et al. 2022

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“…The measurement and control of the spectral properties of optical frequency comb synthesizers [1][2][3], namely, the carrier-envelope offset (CEO) frequency and comb frequency spacing (repetition rate), are a fundamental experimental aspect for high-resolution and precision spectroscopy [4][5][6] and extreme light generation [7][8][9][10], especially when enhanced by the use of passive high-finesse optical cavities [11]. Although the comb repetition rate frequency can be easily measured using a simple fast photodetector, the measurement of the CEO frequency requires dedicated complex experimental methods.…”

Section: Introductionmentioning

confidence: 99%

Carrier-envelope offset frequency measurement by means of an external optical resonator

et al. 2023

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A general-purpose method based on the implementation of the asymmetric Pound–Drever–Hall (PDH) technique is proposed to measure the carrier-envelope offset (CEO) frequency of a mode-locked laser using an external optical cavity. By analyzing the synchronously demodulated signal of the spectrally filtered cavity reflection when the optical resonator is locked to the mode-locked laser, a discriminating signal depending on the relative frequency offset between the mode-locked and optical cavity comb-like spectra is obtained. For a given geometry and group delay dispersion (GDD) of the cavity parameters (i.e., a known cavity mode offset), this signal can be used to retrieve the laser CEO. This approach turns out to be advantageous in terms of setup complexity with respect to other well-known techniques that rely on non-linear frequency generation, such as f–2f interferometers. In addition, this method can be used to precisely determine the laser–cavity spectral coupling, which is an important topic in cavity-enhanced spectroscopy and non-linear optics applications. After the theoretical description of the generalized asymmetric PDH signal, an experimental validation of the proposed method is reported using an Er-doped fiber frequency comb source centered at 1,550 nm, with a repetition rate of 250 MHz, locked to a linear optical cavity with a 1 GHz free spectral range. The theoretical effect of the GDD is confirmed experimentally using different cavity configurations. Moreover, the comparison with the CEO frequency values measured using an f–2f interferometer demonstrates the feasibility of the proposed method.

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