Neodymium-doped A3BGa3Si2O14 series crystal and preparation method and application thereof

Abstract

The invention relates to neodymium-doped A3BGa3Si2O14 series crystal, comprising a series crystal of which the chemical formula is A3BGa3Si2O14, wherein A is Ca or Sr; B is Nb or Ta; according to the record, the neodymium-doped A3BGa3Si2O14 series crystal comprises Nd:Ga3TaGa3Si2O14, Nd:Sr3TaGa3Si2O14, Nd:Sr3NbGa3Si2O14 and Nd:Ca3NbGa3Si2O14. The four kinds of crystals can achieve self-frequency-doubling. The invention also provides a method for preparing the neodymium-doped A3BGa3Si2O14 series crystal. The invention also provides an application of the neodymium-doped A3BGa3Si2O14 series crystal. A commercial semiconductor laser pump (LD) of which the center wavelength is 808nm is adopted, gain medium and non-linear optical property of the neodymium-doped A3BGa3Si2O14 (A=Ca, Sr; B=Nb, Ta) series crystal are utilized, so as to obtain a green self-frequency-doubling laser of which the output wavelength is 533nm. The laser device has the advantages of high conversion efficiency, compact structure, miniaturization, high reliability, long service life and the like.

Description

technical field [0001] The invention relates to a neodymium-doped A 3 B Ga 3 Si 2 o 14 The series of crystals and their preparation method and application belong to the technical field of laser and nonlinear optics. Background technique [0002] All-solid-state green lasers have important application prospects in the fields of laser biomedicine, laser color display, laser high-density data storage, laser spectroscopy, laser printing, laser underwater imaging and communication. Activated ion Nd 3+ corresponding 4 f 3 / 2 → 4 f 11 / 2 The four-level structural transition line (1.06 μm) has strong gain, large emission cross-section and high efficiency. Nd-doped 3+ YAG, YVO 4 The output power of laser crystals such as , YLF and YAP has reached a very high level and the commercialization of 1.06μm solid-state lasers has been realized. At present, the realization of the all-solid-state green laser source of 0.530 μm is mainly obtained by frequency doubling the above 1.06 μ...

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Problems solved by technology

Although LiNbO 3 The effective nonlinear coefficient of the crystal is very large (d eff =5.3pm / V), but the crystal is prone to photodamage due to the photorefractive effect

Although this effect can be weakened by doping MgO in the crystal, it also affects the optical quality of the crystal and limits the Nd 3+ doping concentration

Nd x Y 1-x Al 3 (BO 3 ) 4 The disadvantage of (NYAB) crystals is that it is not easy to obtain bulk single crystals of high optical quality

In addition, NYAB has a strong absorption at 530nm, which is very unfavorable to the self-multiplier output

Nd:ReCaO 4 (BO 3 ) 3 (Re:Y and Gd) crystals have large effective nonlinear coefficients, but the crystals have low symmetry, strong anisotropy of thermal properties, and high requirements for temperature control in practical applications.

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