Influence of composition ratio variations on optical frequency conversion in mixed crystals II Random variation of composition ratio

Huang, Jinjer; Gao, Wei; Shen, Tao; Mao, Bei Li; Andreev, Yu. M.; Shaiduko, A. V.; Ланский, Г. В.; Chatterjee, U.; Atuchin, Victor V.

doi:10.1364/josab.24.003081

Cited by 13 publications

(8 citation statements)

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“…For solid solutions, the segregation process is often a common feature due to the different solidification temperatures for the parent crystals. This feature leads to variability in the composition over the crystal bulk, which should be determined and accounted for in studies and applications 47,48 , as well as when identifying the polytypic composition. As a result, we label crystals in accord with their charge composition.…”

Section: Crystal Characterizationmentioning

confidence: 99%

Doped GaSe crystals for laser frequency conversion

Guo

Xie

et al. 2015

Light Sci Appl

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In this review, we introduce the current state of the art of the growth technology of pure, lightly doped, and heavily doped (solid solution) nonlinear gallium selenide (GaSe) crystals that are able to generate broadband emission from the near infrared (IR) (0.8 mm) through the mid-and far-IR (terahertz (THz)) ranges and further into the millimeter wave (5.64 mm) range. For the first time, we show that appropriate doping is an efficient method controlling a range of the physical properties of GaSe crystals that are responsible for frequency conversion efficiency and exploitation parameters. After appropriate doping, uniform crystals grown by a modified technology with heat field rotation possess up to 3 times lower absorption coefficient in the main transparency window and THz range. Moreover, doping provides the following benefits: raises by up to 5 times the optical damage threshold; almost eliminates two-photon absorption; allows for dispersion control in the THz range independent of the mid-IR dispersion; and enables crystal processing in arbitrary directions due to the strengthened lattice. Finally, doped GaSe demonstrated better usefulness for processing compared with GaSe grown by the conventional technology and up to 15 times higher frequency conversion efficiency. INTRODUCTIONThe e-polytype of gallium selenide (hereinafter GaSe) has been known since 1934 1 and promises efficient optical frequency conversion and detection over a large range of wavelengths. The performance potential of GaSe, which belongs to the point group symmetry 6m2, can be attributed to its extreme physical properties. GaSe has a broadband transparency window over the range of 0.62-20 mm for non-polarized light continues at wavelengths o50 mm 2,3 . Other attractive physical properties of GaSe are its prodigious birefringence B 5 0.375 at l 5 10.6 mm and 0.79 at terahertz (THz) range 4 , and very high second-order nonlinear susceptibility d 22 5 54 pm V 21 at 10 mm 5 and 24.3 pm/V in the THz band 6 . Among the mid-infrared (IR) anisotropic nonlinear crystals, GaSe has the second highest optical damage threshold 7,8 and thermal conductivity in the plane of the (0001) A GaSe crystal was first used for laser frequency conversion in the mid-IR in 1972 9,10 . In subsequent years, GaSe was widely used for inlab mid-IR applications 5 . Over the past two decades, GaSe has been among the most promising nonlinear optical crystals for efficient generation of ultrabroadband radiation 0.8-5640 mm (with the

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Section: Crystal Characterizationmentioning

confidence: 99%

Doped GaSe crystals for laser frequency conversion

Guo

Xie

et al. 2015

Light Sci Appl

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“…The structural and optical properties of complex NLO crystals can be tuned by doping that results in solid solution formation [9,10]. However, to have a wide solid solution range without drastic defect generation and optical quality degradation, it is desirable for the end parent crystals to be isostructural [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Preparation and structural properties of nonlinear optical borates K2(1−x)Rb2xAl2B2O7, 0<x<0.75

Atuchin

Базаров

Gavrilova

et al. 2012

Journal of Alloys and Compounds

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“…Within the past few years many binary and ternary sulfide systems were evaluated in searching for new compounds with noncentrosymmetric crystal structure and nonlinear optical (NLO) properties [2][3][4][5][6][7][8][9][10][11][12]. Among known crystals several binary and ternary thiogallates are showing high level of NLO susceptibility and pronounced ability for solid solution formation necessary for accurate tuning of optical properties by doping [1][2][3]5,7,[13][14][15][16][17]. In all presently known NLO thiogallates the gallium atoms are coordinated by four sulfur atoms and the presence of GaS 4 groups in crystal lattice seems to be a meaningful factor for NLO properties.…”

Section: Introductionmentioning

confidence: 99%