Fabrication and Optical Properties of High‐Performance Polycrystalline Nd:YAG Ceramics for Solid‐State Lasers

Ikesue, Akio; Kinoshita, Toshiyuki; Kamata, Kiichiro; Yoshida, Kunio

doi:10.1111/j.1151-2916.1995.tb08433.x

Cited by 1,162 publications

(510 citation statements)

References 13 publications

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“…The optical transmittance of MOOC-1 gradually increases from 69% at 400 nm to 84% at 700 nm (Fig. 3), being similar with those of Nd:YAG optical ceramics [4]. In other words, MOOC-1 possesses similar optical properties of conventional optical ceramics.…”

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confidence: 54%

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Room-temperature sintered metal-organic framework nanocrystals: A new type of optical ceramics

Zhou

Wang

et al. 2018

Sci. China Mater.

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Ceramic is a rigid material consisting of an infinite threedimensional network of sintered non-oriented inorganic, non-metallic crystalline grains, which are generally nontransparent. If the inner light scatter is eliminated, ceramics can become transparent or optical ceramics [1,2]. With great potentials in optical windows, sensors and lasers, optical ceramics have received great attentions since 1950s [1]. As the gain medium of solid-state lasers, optical ceramics can combine the advantages of large size, high transparency, high mechanical and thermal stabilities, and ease for dispersing the luminous atoms and groups [3]. For comparison, single-crystal gain mediums can suffer high power density but are difficult to grow into large size, while glasses and polymers have reversed characteristics.To make ceramics transparent, the inner pore and impurity should be minimized to zero, which requires highly pure, nanosized, and very uniform crystallite precursors as well as complicated fusing technology ( Fig. 1) [4,5]. The cubic crystal symmetries (absence of the birefringence which causes extremely high scattering losses) are generally required for the crystallites of optical ceramics, meaning that only a few inorganic materials can be used. Besides, ceramics sintering usually operates above 1000 o C, which excludes organic and organic-inorganic hybrid materials [1].Porous coordination polymers (PCPs) or metal-organic frameworks (MOFs) are crystalline materials consisting of metal ions and organic ligands, which have captured widespread attentions for adsorption, catalysis, sensing, optics [6] and also laser gain mediums [7][8][9][10][11]. As can be seen in membranes and photonic crystals [12,13], MOF nanocrystals may merge to form seamless microscopic blocks under mild conditions [14][15][16]. Nevertheless, macroscopic and optical transparent blocks of MOF nanocrystals/microcrystals are still unknown so far. Just like single crystals and optical ceramics, increasing the block size with high optical quality is always a great challenge for many materials. Here, we show that by simply slowing down the solvent evaporation rate, nanocrystals of the prototypical MOF SOD-[Zn(mim) 2 ] (MAF-4/ZIF-8 [17,18], Hmim = 2-methylimidazole, Fig. 2) with the cubic crystal symmetry can fuse at room temperature to form large transparent blocks. After doping laser dye, this metal-organic optical ceramic (MOOC) can show the amplified spontaneous emission (ASE) with a very low energy-density threshold.MAF-4 nanocrystals with uniform size (ca. 20 nm) can be easily synthesized by reaction of Zn(NO 3 ) 2 and Hmim in methanol or ethanol at room temperature (Fig. S1). Compared with the commonly used solvent methanol [19], ethanol is nontoxic and more environment-friendly. After centrifugation and washed, the residual nanocrystals and solvent form a white gel-like (semi-fluidic) block.

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confidence: 54%

“…1) [4,5]. The cubic crystal symmetries (absence of the birefringence which causes extremely high scattering losses) are generally required for the crystallites of optical ceramics, meaning that only a few inorganic materials can be used.…”

mentioning

confidence: 99%

Room-temperature sintered metal-organic framework nanocrystals: A new type of optical ceramics

Zhou

Wang

et al. 2018

Sci. China Mater.

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“…[280,282,298,299,447]). It is enough to note here the results that were achieved concerning the creation of high-power Nd 3+ :Y 3 Al 5 O 12 ceramic lasers with LD pumping.…”

Section: Laser Potential Of Oxide Crystalline Ceramicsmentioning

confidence: 99%

“…Japanese patents JP3463941 and JPS3243278, as well as [724]: Y3(Al,Sc)2Al3O12:Nd 3+ [725] and Y3(Al,Sc)2Al3O12:Yb 3+ [711] for CW and femtosecond lasers. Quite recently, to these modern routes (SSR and VSN) for laser oxide ceramics fabrication, a new attractive HPCSC method was reported (at March 29 on 241.…”

Section: Laser Potential Of Oxide Crystalline Ceramicsmentioning

confidence: 99%

Laser crystals and ceramics: recent advances

Kaminskii

2007

Laser & Photonics Reviews

368

236

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After a brief examination of known insulating laser crystals and the stimulated emission channels of their generating activator ions, this article reviews recent advances in the development of novel lasing crystals and ceramics, as well as inorganic and organic nonlinear-laser crystals for χ (3) and cascaded χ (3) ↔ χ (2) frequency converters. Several new modern attractive technologies in the physics and techniques of crystalline lasers are also discussed.Section of the crystal structure of Na3Li (SeO4)

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“…Transparent ceramic materials have caused great concern to the researchers since the first laser demonstration on Nd:YAG ceramic in 1995 [16], but reports about the white light emission in transparent ceramics are quite a few. Compared with the host materials mentioned above, transparent ceramic can be highly transpar-ent in the ultraviolet-visible-infrared range, which is benefit for the output of the upconversion luminescence.…”

Section: Introductionmentioning

confidence: 99%