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Optical Coatings for High Power Lasers
Published in Marvin J. Weber, and TECHNOLOGY, 2020
Mark R. Kozlowski, Robert Chow, Ian M. Thomas
In general, the laser damage threshold is influenced by, in order of decreasing influence: the coating material, the deposition method/parameters, postdeposition treatments, and the coating design. We will discuss each of these issues below. Postdeposition treatments, such as laser conditioning, are responsible for the largest improvement in multilayer damage thresholds in the past decade. Laser conditioning will be discussed under Postdeposition Laser Conditioning. At the present time, e-beam evaporation is the only fully scaled and practical process capable of fabricating high-quality, large-aperture, high- damage-threshold optical coatings. The following discussion will therefore emphasize issues related to e-beam deposition. Other possible coating fabrication processes including energetic physical vapor deposition, plasma-assisted chemical vapor deposition (PACVD), and sol-gel processing are discussed later.
Fabrication of ridge waveguide on the ion-implanted TGG crystal by femtosecond laser ablation
Published in Journal of Modern Optics, 2020
Jing-Yi Chen, Jie Zhang, Liao-Lin Zhang, Chun-Xiao Liu
Magneto-optical materials are critical for various optical devices such as optical isolators, optical circulators and optical modulators in the fields of fibre lasers, optical communications and so on [1,2]. As one of the most intriguing and commercialized magneto-optical materials, terbium gallium garnet (Tb3Ga5O12, TGG) crystal has attracted widespread attention because of its outstanding optical and magnetic properties in the visible and infrared spectral range [2]. The Verdet constant (describes the strength of the Faraday effect) and the thermal conductivity are superior in TGG crystal compared with magneto-optic glasses [3,4]. Specifically, the Verdet constant of the TGG crystal is 35 Rad T−1m−1 and thermal conductivity is 7.4 Wm−1K−1 [5,6]. Furthermore, TGG possesses low transmission loss, high laser damage threshold and low absorption coefficient [7,8]. By virtue of its advantages, TGG crystal has become a suitable candidate medium for creating Faraday effect devices. However, the traditional bulk Faraday isolators are hardly compatible with photonic integrated circuits [9]. In order to realize the integration, it is necessary to develop a waveguide-type optical device with host TGG crystal.
Structural, electrical and optical properties of gamma irradiated methyl para-hydroxy benzoate single crystals
Published in Radiation Effects and Defects in Solids, 2019
Apurva Gupta, M. K. Raseel Rahman, K. Asokan, N. Vijayan, Lekha Nair
Nonlinear optical (NLO) single crystals play an important role in optics and photonics because of many potential applications such as in signal processing, frequency conversion, optical switching, data storage devices, laser technology, etc. (1,2). Organic materials have generated interest in this field in recent decades due to their high non-linearity (HNL), inherent synthetic flexibility and good transparency in the visible region. They have also shown high laser damage threshold (HLDT), as compared to inorganic materials (2,3). The high non-linearity of organic materials is primarily due to the presence of the delocalised π-electron conjugated system, which connects the donor and acceptor groups. In methyl para-hydroxy benzoate (abbreviated as MHB, C8H8O3), the hydroxyl (OH) and ester carbonyl groups (COOCH3) are present, and act as the electron donor and acceptor groups (3). In MHB, these groups are present on the benzene ring, and can establish the charge transfer mechanism, which is an essential feature for the NLO response of these compounds (4).
Growth and characterization studies of 3-aminobenzene sulfonic acid single crystal for thermal application
Published in Inorganic and Nano-Metal Chemistry, 2022
K. Gayathiridevi, G. Pasupathi, B. Deepa, K. Kaviyarasu, A. Ayeshamariam
The proficient focusing of new NLO materials and their significance applications are an extremity for laser frequency conversion, optical communication, optical data storage.[1] This significant NLO materials are desired to design with its valuable properties such as high optical susceptibilities, higher laser damage threshold resistance, constant thermal and mechanical behavior.[2,3] Usually an organic crystal made of highly polarizable molecule that is conjugated molecules where highly delocalized π-electrons can easily move between electron donor and acceptor groups an opposite side of the molecule inducing a molecular charge transfer.[4] Amino aromatic benzene derivatives are attractive materials in the field of optoelectronic applications. One of the organosulfonic compounds is 3-Amino benzene sulfonic acid and its crystal exits as zwitterion form due to the deprotonation of sulfonic acid (SO3–) and protonated amino group (NH+).[5] The zwitterion which may be produced strong hydrogen bond and close packing of molecules are important factors for materials generate nonlinear optical behavior.[6] In addition, the 3-ABSA used in the field of optical communication, optical data storage and fabrication of synthetic dyes, medicine and glucose biosensor.[7] The extensive literature survives reported only the x-ray crystallographic data and no other characterization details of 3-ABSA. Due to an existing parameter and the literature report of 3-ABSA, we have decided to grow the single crystal of 3-ABSA and it was subjected to various characterization studies reported in detail.