The low kutentha gawo barium metaborate (β-BaB₂O₄, BBO mwachidule) crystal ndi ya tripartite crystal system, 3m point group. Mu 1949, Levinndi al. adapeza gawo lotsika lotentha la barium metaborate BaB₂O₄ palimodzi. Mu 1968, Brixnerndi al. ntchito BaCl₂ monga flux kuti mupeze kristalo wowonekera wa singano. Mu 1969, Hubner anagwiritsa ntchito Li₂O monga flux kukula 0.5mm×0.5mm×0.5mm ndi kuyeza deta zofunika za kachulukidwe, magawo selo ndi danga gulu. Pambuyo pa 1982, Fujian Institute of Matter Structure, Chinese Academy of Sciences idagwiritsa ntchito njira yosungunula mchere wa kristalo kukulitsa kristalo imodzi yayikulu, ndipo idapeza kuti BBO crystal ndi chinthu chabwino kwambiri chowirikiza kawiri. Pogwiritsa ntchito electro-optic Q-switching application, BBO crystal imakhala ndi vuto la kuchepa kwa electro-optic coefficient yomwe imatsogolera kumagetsi okwera kwambiri, koma ili ndi mwayi wochuluka kwambiri wa kuwonongeka kwa laser.

Fujian Institute of Matter Structure, Chinese Academy of Sciences yachita ntchito zingapo pakukula kwa makhiristo a BBO. Mu 1985, kristalo imodzi yokhala ndi kukula kwa φ67mm×14mm idakula. Kukula kwa kristalo kunafika φ76mm×15mm mu 1986 ndi φ120mm×23mm mu 1988.

Kukula kwa makhiristo pamwamba pa zonse kutengera njira yosungunuka-mchere wa kristalo (yomwe imadziwikanso kuti top-seed-crystal method, flux-lifting method, etc.). Mtengo wa kukula kwa kristalo m'magawoc-axis mayendedwe akuchedwa, ndipo ndizovuta kupeza kristalo wapamwamba kwambiri. Kuphatikiza apo, electro-optic coefficient ya BBO crystal ndi yaying'ono, ndipo kristalo yayifupi imatanthawuza kuti magetsi okwera kwambiri amafunikira. Mu 1995, Goodnondi al. adagwiritsa ntchito BBO ngati zinthu za electro-optic kwa EO Q-modulation ya Nd: YLF laser. Kukula kwa galasi la BBO linali 3mm×3mm×15mm(x, y, z), ndipo kusinthidwa kosinthika kudakhazikitsidwa. Ngakhale kuti kutalika kwa kutalika kwa BBO iyi kumafika ku 5: 1, mphamvu ya kotala-wave idakalipo mpaka 4.6 kV, yomwe ili pafupi ndi 5 nthawi za EO Q-modulation ya LN crystal pansi pazikhalidwe zomwezo.

Pofuna kuchepetsa mphamvu yogwiritsira ntchito, BBO EO Q-switch imagwiritsa ntchito makhiristo awiri kapena atatu palimodzi, zomwe zimawonjezera kutayika kwa kuika ndi mtengo. Nickelndi al. anachepetsa mphamvu ya theka la mafunde a BBO crystal popangitsa kuwala kudutsa mu kristalo kangapo. Monga momwe tawonetsera pachithunzichi, mtengo wa laser umadutsa mu kristalo kwa nthawi zinayi, ndipo kuchedwa kwa gawo komwe kunayambika ndi galasi lowonetsera kwambiri lomwe linayikidwa pa 45 ° kunalipidwa ndi mbale yoweyula yomwe inayikidwa mu njira ya kuwala. Mwa njira iyi, mphamvu ya theka-wave ya BBO Q-switch iyi ikhoza kukhala yotsika ngati 3.6 kV.

Chithunzi 1. BBO EO Q-modulation ndi low theka-wave voltage - WISOPTIC

Mu 2011 Perlov ndi al. adagwiritsa ntchito NaF ngati flux kukulitsa BBO crystal ndi kutalika kwa 50mm mkatic-axis malangizo, ndipo analandira BBO EO chipangizo ndi kukula kwa 5mm×5mm×40mm, ndi kuwala yunifolomu kuposa 1×10⁻⁶ cm⁻¹, yomwe imakwaniritsa zofunikira za EO Q-switching applications. Komabe, kukula kwa njirayi ndi miyezi yoposa 2, ndipo mtengo wake udakali wokwera.

Pakali pano, EO coefficient yotsika kwambiri ya BBO crystal ndi zovuta za kukula kwa BBO ndi kukula kwakukulu ndi khalidwe lapamwamba kumalepheretsabe BBO's EO Q-switching application. Komabe, chifukwa cha kuwonongeka kwakukulu kwa laser komanso kuthekera kogwira ntchito pafupipafupi kubwerezabwereza, BBO crystal ikadali mtundu wa EO Q-modulation material yokhala ndi mtengo wofunikira komanso tsogolo labwino.

Chithunzi 2. BBO EO Q-Sinthani ndi magetsi otsika a theka-wave - Wopangidwa ndi WISOPTIC Technology Co., Ltd.