一种特殊切角的BBO晶体、一种三倍频光学变频器及其工作方法

• Format: Patent
• Language: Chinese
• Published: 21.11.2023
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

本发明涉及一种特殊切角的BBO晶体、一种三倍频光学变频器及其工作方法，当基频光波长从750nm逐渐增加到1200nm过程中，BBO晶体的相位匹配角θ从42.1°-52.1°逐渐减小到24.2°-34.2°，BBO晶体的方位角φ为6°-16°；BBO晶体通光方向上的长度为6-14mm。本发明单块BBO晶体可以实现上述波段近红外激光的高效级联三倍频，输出紫外或者紫色激光。本发明制成的三倍频光学变频器具有成本低、抗光损伤阈值高、可用波段宽、有效非线性光学系数大、输出能量大、转换效率高等优点，整体性能优于以ADP、KDP或者GdxY1-xCOB晶体制成的同类器件。 The invention relates to a BBO crystal with a special chamfered angle, a triple-frequency optical converter and a working method of the triple-frequency optical converter. When the fundamental-frequency optical wavelength is gradually increased from 750 nm to 1200 nm, the phase-matching angle theta of the BBO crystal is gradually decreased from 42.1-52.1 degrees to 24.2-34.2 degrees, and the azimuth angle phi of the BBO crystal is 6-16 degrees; the length of the BBO crystal in the optical direction is 6-14 mm. The single BBO crystal can achieve high-efficiency cascade triple frequency of nearinfrared laser of wave bands, and ultraviolet or purple laser is output. The prepared triple-frequency optical converter has the advantages of