Scaling of laser-induced contamination growth at 266nm and 355nm

Ließmann, M.; Jensen, Lars; Balasa, Istvan; Hunnekuhl, M.; Büttner, A.; Weßels, P.; Neumann, Jörg; Ristau, Detlev

doi:10.1117/12.2194083

Cited by 6 publications

(5 citation statements)

References 4 publications

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“…These processes were described in the UV (355 nm) and more recent studies have shown an even growing importance of LIC in the deep UV (266 nm). 48 In our case the self-limiting vertical growth of LIC 15 deposit could also be caused by absorption, possibly by two-photon absorption in the deep UV because of the short pulse duration and high intensity.…”

Section: Dynamics Of Lic Formationmentioning

confidence: 60%

Analysis of laser-induced contamination at 515 nm in the sub-ps/MHz regime

Reaidy

Gallais

2020

Opt. Eng.

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We study Laser-Induced Contamination (LIC) as a potential cause of optical losses and Laser-Induced Damage (LID) of optical components for ultrashort pulse lasers with high average power in the MHz regime. Our work is conducted on dichroic mirrors designed for maximum reflection at 515nm operated in ambient air. Based on the development of an experimental set-up for real time monitoring of LIC and accelerated test protocols, we have conducted a parametric study on LIC development and studied its growth dynamics and morphology. We show that LIC is a main limitation of short wavelength high average power fs/ps lasers, with the formation of nanometric highly absorbing layers of carbonate compounds on the laser footprint, with evidence of thermal effects. It is also found that the last layer of the stack, at the interface between air and coating stack, is critical in the LIC growth which can open some perspectives for limitation of this effect.

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Section: Dynamics Of Lic Formationmentioning

confidence: 60%

Analysis of laser-induced contamination at 515 nm in the sub-ps/MHz regime

Reaidy

Gallais

2020

Opt. Eng.

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“…Both the porosity and the availability of possible reaction sites on the surface are important [23,24]. Even catalytic properties of defects have been discussed [26], in line with the observation that coatings with high internal strain are more strongly contaminated than uncoated substrates [6,27,28].…”

Section: Introductionmentioning

confidence: 82%

“…On the other hand, also the wavelength might play a role. Light at 266 nm is resonant both to electronic transitions in aromatic hydrocarbons and non-bonding oxygen hole center-defects (NBOHC) in strained silica films [6,25,41]. Hence, we might excite both the contaminating particles and the possible reaction sites very effectively [6].…”

Section: Discussionmentioning

confidence: 99%

“…Laser-induced degradation of optical components in vacuum is a common challenge faced in sealed [1][2][3] and space-based laser systems [4][5][6][7][8], lithography [9][10][11][12], spectroscopy [13][14][15][16][17][18], and quantum optics [19][20][21][22]. Often this can be traced back to residual hydrocarbons that photochemically react with the optical components and deteriorate their properties [3,4,23].…”

Section: Introductionmentioning

confidence: 99%

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Multi-Watt cavity for 266 nm light in vacuum

et al. 2023

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Intense coherent ultraviolet radiation is gaining increasing importance in advanced quantum technologies – from optical clocks and quantum computers to matter-wave interferometry – as well as in photochemistry, life sciences, semiconductor industry, and space applications. Since the preparation of multi-Watt light sources is still an open challenge for many ultraviolet wavelengths, resonant enhancement in a cavity is an attractive alternative. However, many experiments with atoms, molecules or nanoparticles require isolation in high vacuum where UV optics often show fast degradation. Here, we present stable performance of a cavity for 266 nm light with several Watt of intra-cavity power in high vacuum despite the presence of hydrocarbons. Comparing two sets of cavity mirrors indicates that this feat is connected to the micro-chemical environment at the topmost coating layer. Our study emphasizes the need for further developments in this direction to facilitate robust, compact, and high-performing devices employing UV radiation.

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“…Here, it was shown that the presence of oxygen allows for an efficient suppression of LIC effects on the coatings of high-energy UV laser systems [27][28][29]. Furthermore, investigations on the effect of LIC in combination with 266 nm radiation have also been performed in-house [30]. Several critical components of the MOMA LH have been tested regarding their potential for the growth of contamination, namely the electrical cables, the electrical connector, samples of heat shrink tube, the foil heaters as well as the adhesive used for screw securing.…”

Section: Beam Deflection Laser Housing and Interface Opticsmentioning

confidence: 99%

Space-qualified, compact and lightweight pulsed DPSS UV laser for the MOMA instrument of the ExoMars mission

et al. 2022

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A space-qualified pulsed UV laser has been developed as an irradiation source for the Mars Organic Molecule Analyser (MOMA) instrument aboard the “Rosalind Franklin” rover of the ExoMars mission (ESA/Roscosmos). MOMA will search for signatures of extinct and/or extant life on Mars. Its advanced analytical capabilities arise from the combination of a pyrolysis gas chromatograph and an ion trap-based mass spectrometer. With the addition of a compact UV laser system enabling laser desorption/ionization mass spectrometry, MOMA can detect a wide variety of both volatile and non-volatile, organic and inorganic molecules within Martian soil samples of interest. The design of the MOMA Laser Head is based on a longitudinally diode-pumped, passively Q-switched Nd:Cr:YAG oscillator generating millijoule pulses with nanosecond pulse durations at a wavelength of 1064 nm. A subsequent two-stage frequency quadrupling converts the fundamental infrared emission of the oscillator into the deep UV at 266 nm. The Laser Head emits UV pulses with a duration of about 1.5 ns and an energy tunable between 12.5 and 125 µJ for optimum adaptation to varying ionization thresholds of different molecular species. The complex but highly compact opto-mechanical design, enclosed in a hermetically sealed housing, is realized within an envelope of 200 × 56 × 45 mm3 with a total mass of less than 220 g. In this paper, we present a comprehensive summary of our development efforts towards the delivery of the LH Flight Model, which has been integrated to the MOMA instrument and finally incorporated into the ExoMars rover.

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Scaling of laser-induced contamination growth at 266nm and 355nm

Cited by 6 publications

References 4 publications

Analysis of laser-induced contamination at 515 nm in the sub-ps/MHz regime

Analysis of laser-induced contamination at 515 nm in the sub-ps/MHz regime

Multi-Watt cavity for 266 nm light in vacuum

Space-qualified, compact and lightweight pulsed DPSS UV laser for the MOMA instrument of the ExoMars mission

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