A high-performance photoelectric functional crystal calcium borate thulium oxide crystal and its growth and application

Abstract

The invention relates to high-performance photoelectric functional calcium borate thulium oxide crystal and growth and application thereof. The formula of the calcium borate thulium oxide crystal is TmCa4O(BO3)3; the crystal in a non-centrosymmetric structure belongs to monoclinic m-point groups and is 101.12 DEG in cell parameter beta, boils at 1460 DEG C, and shows no change at the temperature from the room temperature to the boiling point. A growth method of the crystal includes preparation of polycrystalline material and growth by the Czochralski method; the high-quality calcium borate thulium oxide crystal 20-40mm in diameter and 20-50mm in height can be made. The TmCa4O(BO3)3 crystal is larger than 80% in optical transmittance under the frequency of 808nm-1100nm and 1300nm-156-nm, has an effective piezoelectric constant of deff=1pC / N-5pC / N and effective electromechanical coupling factor of keff=10-30%, and can be used as nonlinear optical crystals, laser crystals or piezoelectric crystals.

Description

technical field [0001] The invention relates to a high-performance photoelectric functional crystal calcium thulium borate crystal (TmCa 4 O(BO 3 ) 3 ) and its growth process and its application in the fields of laser, nonlinear optics and piezoelectricity belong to the field of crystal growth technology and application. Background technique [0002] Rare earth calcium borate crystals (ReCa 4 O(BO 3 ) 3 , ReCOB, Re: rare earth element) belongs to the monoclinic system and has non-centrosymmetric structure characteristics, so it has nonlinear optical effect and piezoelectric effect, and can also be used as a laser host crystal. For the compound crystals of this configuration, in 1991, Khamaganora et al. first studied the synthesis and structure of SmCOB crystals; in 1993, Russian scientist A.B.Iliukhin synthesized TbCOB, LuCOB and GdCOB crystals by flux method, and studied the structural characteristics of the crystals . In 1996, Aka et al. used the Czochralski method ...

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Problems solved by technology

[0003] According to current reports, YCOB, GdCOB and LaCOB crystals have high transmittance in the 300nm-2000nm band, while other ReCOB crystals, such as NdCOB, SmCOB, ErCOB and PrCOB crystals, have high transmittance in some special practical bands such as 355nm, 532nm, 1064nm There are different degrees of absorption, so the application in the field of laser and nonlinear optics is limited

Research on existing crystals shows that although YCOB and GdCOB crystals are easy to obtain large-size high-quality single crystals, the effective nonlinear optical coefficient and allowable angle need to be further improved; LaCOB crystal has a larger allowable angle and effective nonlinear optical coefficient than YCOB and GdCOB crystals. Optical coefficient, but crystal growth is more difficult

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