New Borate Structures for Nlo Applications

Keszler, Douglas A.; Akella, Annapoorna; Schaffers, Kathleen I.; Alekel, Theodore

doi:10.1557/proc-329-15

Cited by 62 publications

(41 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2), thus reducing their alignment and, to some degree, the nonlinear coefficient d 22 value theoretically possible with perfect alignment. [92] A similar misalignment is observed in Sr 2 Be 2 B 2 O 7 , where [BO 3 ] groups are linked, through [BeO 4 ] tetrahedra by sharing corners, to sheets, which are stacked with coplanar orientation along [001]. With respect to the polar diad axis of the structure they are rotated by an angle of 24 ( Fig.…”

Section: Structural Considerationsmentioning

confidence: 53%

“…Like GdCa 4 (BO 3 ) 3 O these crystals also show inclusions of bubbles. [90,91] A very new borate compound for potential NLO applications, BaCaBO 3 F, has been reported recently by Keszler et al [92] Doping of the Ca sites with Yb leads to IR laser emission and the material is suggested to be a selffrequency-doubling laser. Large single crystals of Yb:BaCaBO 3 F can be grown by the Czochralski technique from a melt prepared in two steps to avoid the formation of Ba and/or Ca peroxides.…”

Section: Congruently Melting Nlo Boratesmentioning

confidence: 99%

“…As pointed out by Xia, [145] compounds of the type M m A 2 (BO 3 )X n , where M is a cation with coordination number (CN) greater than four, A is a cation with CN = 4, and X = O, OH, F, etc., are also favored to obtain non-centrosymmetric structures. Keszler et al [92] 3 ] groups with one elongated B±O bond and to align them parallel to one crystallographic direction. Although there are some practical difficulties, according to these ideas a way to design a new type of NLO borates might possibly be opened.…”

Section: Structural Considerationsmentioning

confidence: 99%

See 2 more Smart Citations

Borate Materials in Nonlinear Optics

Becker¹

1998

Adv. Mater.

1,396

757

View full text Add to dashboard Cite

Section: Structural Considerationsmentioning

confidence: 53%

Section: Congruently Melting Nlo Boratesmentioning

confidence: 99%

Section: Structural Considerationsmentioning

confidence: 99%

See 1 more Smart Citation

Borate Materials in Nonlinear Optics

Becker¹

1998

Adv. Mater.

1,396

757

View full text Add to dashboard Cite

“…Since the O1 sites are partly occupied, there will be the absorption peaks of BO 4 and also of BO 3 groups. In the IR spectrum (see the Supporting Information), [30] the strong peaks at 1406, 1354, 1298, and 907 cm À1 are attributed to the asymmetric and the symmetric stretching of BO 3 . The peaks at 1028 and 792 cm À1 are attributed to the asymmetric and the symmetric stretching of BO 4 .…”

Section: +mentioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

Cs₂B₄SiO₉: A Deep‐Ultraviolet Nonlinear Optical Crystal

et al. 2013

View full text Add to dashboard Cite

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-...

show abstract