Laser-Induced Damage of Optical Materials

Wood, Roger M.

doi:10.1887/0750308451

Cited by 103 publications

(19 citation statements)

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“…The suitability of a CW laser for the THA is due to a twofold reason. Firstly, it is less destructive than a pulsed laser [63], so it is less easily detectable by Alice and Bob. Secondly, a CW laser is not less efficient than a pulsed laser in probing devices that are modulated according to a non-return-tozero (NRZ) logic, and assuming NRZ modulation for the transmitter's devices is a conservative choice [42].…”

Section: Simulation Of the Key Generation Ratementioning

confidence: 99%

Decoy-state quantum key distribution with a leaky source

2016

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In recent years, there has been a great effort to prove the security of quantum key distribution (QKD) with a minimum number of assumptions. Besides its intrinsic theoretical interest, this would allow for larger tolerance against device imperfections in the actual implementations. However, even in this device-independent scenario, one assumption seems unavoidable, that is, the presence of a protected space devoid of any unwanted information leakage in which the legitimate parties can privately generate, process and store their classical data. In this paper we relax this unrealistic and hardly feasible assumption and introduce a general formalism to tackle the information leakage problem in most of existing QKD systems. More specifically, we prove the security of optical QKD systems using phase and intensity modulators in their transmitters, which leak the setting information in an arbitrary manner. We apply our security proof to cases of practical interest and show key rates similar to those obtained in a perfectly shielded environment. Our work constitutes a fundamental step forward in guaranteeing implementation security of quantum communication systems.

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Section: Simulation Of the Key Generation Ratementioning

confidence: 99%

Decoy-state quantum key distribution with a leaky source

2016

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“…A laser-induced damage threshold (LIDT) of the standard single-mode fiber is theoretically limited by the softening point of silica and its tolerance to thermally induced stress [46]. However, in reality, thermal damage likely happens at the fiber connection points or the interface between the fiber core and the cladding [46,47]. A fiber fuse phenomenon can be triggered by high temperatures at a fiber end facet [48,49].…”

Section: Optical Power Handling Capacity Of Single-mode Fibersmentioning

confidence: 99%

Laser-Damage Attack Against Optical Attenuators in Quantum Key Distribution

Huang

Egorov

et al. 2020

Phys. Rev. Applied

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Many quantum key distribution systems employ a laser followed by an optical attenuator to prepare weak coherent states in the source. Their mean photon number must be pre-calibrated to guarantee the security of key distribution. Here we experimentally show that this calibration can be broken with a high-power laser attack. We have tested four fiber-optic attenuator types used in quantum key distribution systems, and found that two of them exhibit a permanent decrease in attenuation after laser damage. This results in higher mean photon numbers in the prepared states and may allow an eavesdropper to compromise the key.

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“…The primary form of laser induced damage, for which we need to estimate tolerable energy density thresholds of the VISAR optics, is expected to be dielectric breakdown. This is based on the relatively short pulse length of the CHACO laser [14]. As a follow-up to this study, detailed calculations on laser induced damage thresholds will have to be conducted to verify that the CHACO laser can be safely propagated along the VISAR beamline.…”

Section: A Probe Lasermentioning

confidence: 99%

Feasibility Study for Implementing an Optical Thomson Scattering System for Studying Photoionized Plasmas on Z

Kozłowski

Mancini

Koepke

2018

IEEE Trans. Plasma Sci.

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Many astrophysical environments such as X-ray binaries, active galactic nuclei, and accretion disks of compact objects have photoionized plasmas. The strong photoionizing environment found near these bright X-ray sources can be produced in a scaled laboratory experiment, and direct measurements can form a testbed for spectroscopic models and photoionization codes used in analysis of these astrophysical objects. Such scaled experiments are currently being conducted using Ne filled gas cells on the Z-facility as part of the Z Astrophysical Plasma Properties (ZAPP) collaboration. The plasma is diagnosed using a pressure sensor for density and X-ray absorption spectroscopy for charge-state distribution. The electron temperature is presently inferred from a Li-like ion level population ratio, but it is necessary to obtain an independent temperature measurement, as photoionization alters the charge state distribution and can therefore cause errors in temperatures obtained via line ratio techniques. Optical Thomson scattering is a fitting diagnostic because it directly probes the distribution of plasma particle velocities with respect to a central probe frequency. It is a powerful diagnostic which can produce time and space resolved measurements of electron temperature, as well as, electron density, ion temperature, and average ionization. In this paper, we explore a possible design for an optical Thomson scattering system to supplement X-ray spectroscopic measurements. The proposed design will use equipment that is available on Z, though not yet assembled. Both the feasibility and impact of this new diagnostic are assessed by simulating expected spectra for a range of plasma parameters, thereby demonstrating the sensitivity of this diagnostic.

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Laser-Induced Damage of Optical Materials

Cited by 103 publications

References 0 publications

Decoy-state quantum key distribution with a leaky source

Decoy-state quantum key distribution with a leaky source

Laser-Damage Attack Against Optical Attenuators in Quantum Key Distribution

Feasibility Study for Implementing an Optical Thomson Scattering System for Studying Photoionized Plasmas on Z

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