Design and growth of new NLO crystals for UV light generation

Hu, Zhanggui; Yoshimura, Masashi; Mori, Yusuke; Sasaki, T.

doi:10.1016/j.jcrysgro.2004.10.160

Cited by 46 publications

(29 citation statements)

References 24 publications

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“…KBBF has gained extreme popularity after its remarkable nonlin ear optical properties in the short wavelength region of the spectrum became known, to wit, the nonlinear optical coefficient is d = 0.49 pm/V, second harmonic generation efficiency reaches 26.1%, and the thresh old of damage by laser radiation (λ = 1064 nm, τ = 10 ns) is in excess of 40 GW/cm 2 [3,4]. By now, one successfully obtains on a KBBF crystal the sixth har monic (λ = 177.3 nm) of Nd : YVO 4 or Nd : YAG lasers [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Luminescence and electronic excitations in KBe2BO3F2 crystals

et al. 2012

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Abstract-This paper reports on a study of the dynamics of electronic excitations in KBe 2 BO 3 F 2 (KBBF) crystals by low temperature luminescent vacuum ultraviolet spectroscopy with nanosecond time resolution under photoexcitation by synchrotron radiation. The first data have been obtained on the kinetics of photo luminescence (PL) decay, time resolved PL spectra, time resolved PL excitation spectra, and reflection spectra at 7 K; the estimation has been performed for the band gap E g = 10.6-11.0 eV; the predominantly excitonic mechanism for PL excitation at 3.88 eV has been identified; and defect luminescence bands at 3.03 and 4.30 eV have been revealed. The channels of generation and decay of electronic excitations in KBBF crystals have been discussed.

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Section: Introductionmentioning

confidence: 99%

Luminescence and electronic excitations in KBe2BO3F2 crystals

et al. 2012

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“…Such units are BO 3 , BO 4 , SiO 4 , and PO 4 . [6,7,21] A compound Rb 2 Be 2 Si 2 O 7 [22] was ever expected to be a substitution for KBBF owing to its similar structure characteristics with KBBF and without the layer habit. But, the weak SHG response of Rb 2 Be 2 Si 2 O 7 makes the substitution end in naught.…”

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confidence: 99%

Cs₂B₄SiO₉: A Deep‐Ultraviolet Nonlinear Optical Crystal

et al. 2013

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The generation of deep-ultraviolet (UV) coherent light from nonlinear optical (NLO) materials [1][2][3][4] as one of the most promising resource, has become a topic of intensive study because of its important applications in a broad range of fields, such as semiconductor photolithography, laser micromachining, photochemical synthesis, and material processing. They are able to shorten the wavelength of light by a factor of two (or doubling the frequency), based on the process of second-harmonic generation (SHG), which occurs only when a centrosymmetric symmetry operation is absent in a crystal. However, for a noncentrosymmetric (NCS) crystal to be used as a nonlinear optical material the essential crystal property requirements are that the crystals possess a large NLO response, wide transparent window, suitable birefringence for phase-matching, good mechanical strength, and chemical stability. [4,5] After continuous efforts over several decades, many NCS compounds were obtained by incorporating functional borate structure units, such as B 3 O 6 and B 3 O 7 . b-BaB 2 O 4 (BBO) [6] and LiB 3 O 5 (LBO) [7] are the most advanced NLO materials, which have widely been used as optoelectronic devices. However, to date, KBe 2 BO 3 F 2 (KBBF) [8,9] is the only material that can generate coherent light wavelengths below 200 nm by direct SHG, which makes KBBF a research hotspot. Unfortunately, the KBBF crystal is very difficult to grow in thickness owing to the growth habit of the layer, which severely limits the coherent light output power. Thus, finding the optimal composition that is facile to synthesize, yields large single crystals, and simultaneously satisfies the NLO requirements has attracted considerable attention. [10,11] The presence of large NLO coefficients in a structure is usually in contradiction with wide band gaps in one compound. For instance, the structural units in the known compounds are second-order Jahn-Teller (SOJT) polar dis- [17] which combine with diverse other functional building units to produce materials with large NLO coefficients, for example, Cd 4 BiO-(BO 3 ) 3 (6 KDP), [18] Pb 2 B 5 O 9 I (13.5 KDP), [19] and Ba 23 Ga 8 Sb 2 S 38 (22 AgGaS 2 ).[20] However, the structural units produce an unwanted effect-the UV absorption edge shifts toward the red region, making them less suitable for the deep-UV applications. It is necessary to create the subtle balance of above-mentioned conflicting factors so as to search for the new deep-UV NLO crystals with excellent comprehensive performances.To circumvent the wide absorption window requirement, basic structural units having excitation energies near the UV region are necessary. Such units are BO 3 , BO 4 , SiO 4 , and PO 4 . [6,7,21] A compound Rb 2 Be 2 Si 2 O 7 [22] was ever expected to be a substitution for KBBF owing to its similar structure characteristics with KBBF and without the layer habit. But, the weak SHG response of Rb 2 Be 2 Si 2 O 7 makes the substitution end in naught. However, the borosilicate may be a potential candidate for a deep-...

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“…Néanmoins, KBBF et SBBO, de structure lamellaire et de fusion non congruente, sont extrêmement difficiles à élaborer en flux alors que des voies de synthèse hydrothermale commencent à être explorées [17], leur synthèse implique la manipulation de béryllium (hautement toxique) et ils possèdent de piètres caractéristiques mécaniques. Par exemple, il n'a pas été possible jusqu'à maintenant d'obtenir des lames de KBBF orientées perpendiculairement à c d'épaisseur supérieure à 2 mm : leur utilisation dans des dispositifs laser a alors pu se faire par leur insertion dans des prismes de CaF 2 maintenus par contact optique [15,16] [18][19][20]. Ils sont tous constitués de groupements anioniques [BO 3 ] comme KBBF et SBBO, mais leurs propriétés mécaniques sont sensiblement améliorées du fait d'un caractère lamellaire moins prononcé.…”

Section: Kbe 2 Bo 3 F 2 (Kbbf) Et Sr 2 Be 2 B 2 O 7 (Sbbo)unclassified

Développement de nouveaux cristaux non linéaires pour la conception de dispositifs laser solides émettant dans l'ultraviolet

Xu¹,

Gheorghe²,

Loiseau³

et al. 2009

UVX 2008 - 9e Colloque Sur Les Sources Cohérentes Et Incohérentes UV, VUV Et X : Applications Et Développements Récents

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Résumé.Une technique prometteuse pour la réalisation de dispositifs laser solides émettant dans l'ultraviolet consiste à disposer en cascade plusieurs cristaux non linéaires générant des sommes de fréquence à partir d'une émission laser fondamentale située dans le proche infra-rouge. Cependant, à ce jour, peu de cristaux non linéaires offrent la possibilité de générer de manière efficace des longueurs d'onde voisines ou inférieures à 250 nm. Dans ce but, les plus gros efforts de recherche actuels s'orientent vers des cristaux contenant des groupements borate. Après une description des principaux cristaux non linéaires proposés pour ce type d'application, nous présenterons les études que nous menons sur des matériaux de type fluoroborate, dérivés des oxoborates de terre rare et de calcium TrCa 4 O(BO 3 ) 3 (Tr = terre rare), et sur des matériaux de structure huntite TrMe 3 (BO 3 ) 4 (Me = Al, Ga, Sc).

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Design and growth of new NLO crystals for UV light generation

Cited by 46 publications

References 24 publications

Luminescence and electronic excitations in KBe2BO3F2 crystals

Luminescence and electronic excitations in KBe2BO3F2 crystals

Cs₂B₄SiO₉: A Deep‐Ultraviolet Nonlinear Optical Crystal

Développement de nouveaux cristaux non linéaires pour la conception de dispositifs laser solides émettant dans l'ultraviolet

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Design and growth of new NLO crystals for UV light generation

Cited by 46 publications

References 24 publications

Luminescence and electronic excitations in KBe2BO3F2 crystals

Luminescence and electronic excitations in KBe2BO3F2 crystals

Cs2B4SiO9: A Deep‐Ultraviolet Nonlinear Optical Crystal

Développement de nouveaux cristaux non linéaires pour la conception de dispositifs laser solides émettant dans l'ultraviolet

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Cs₂B₄SiO₉: A Deep‐Ultraviolet Nonlinear Optical Crystal