Ƙananan zafin lokaci barium metaborate (β-BaB₂O₄, BBO a takaice) crystal nasa ne da tsarin kristal uku, 3m kungiyar maki. A 1949, Levinda al. gano ƙananan zafin jiki barium metaborate BaB₂O₄ fili. A 1968, Brixnerda al. amfani da BaCl₂ a matsayin juyi don samun madaidaiciyar allura-kamar crystal guda ɗaya. A cikin 1969, Hubner ya yi amfani da Li₂O a matsayin juyi don girma 0.5mm × 0.5mm × 0.5mm kuma auna ainihin bayanan yawa, sigogin tantanin halitta da rukunin sarari. Bayan 1982, Cibiyar Nazarin Halittar Halittar Fujian, Kwalejin Kimiyya ta kasar Sin ta yi amfani da hanyar zurfafa zuriyar iri-crystal don girma babban kristal guda ɗaya a cikin jujjuyawar, kuma ta gano cewa kristal na BBO wani abu ne mai kyau na ultraviolet mai ninki biyu. Don aikace-aikacen canza wutar lantarki-Optic Q, BBO crystal yana da lahani na ƙarancin ƙarancin wutar lantarki wanda ke haifar da babban ƙarfin wutar lantarki mai ƙarfi, amma yana da fa'ida mai fa'ida sosai na madaidaicin lalacewar Laser.

Cibiyar nazarin al'amura ta Fujian, kwalejin kimiyya ta kasar Sin, ta gudanar da jerin ayyukan ci gaban lu'ulu'u na BBO. A cikin 1985, an girma crystal guda tare da girman φ67mm × 14mm. Girman crystal ya kai φ76mm × 15mm a cikin 1986 da φ120mm × 23mm a cikin 1988.

Girman lu'ulu'u sama da duka yana ɗaukar hanyar zuriyar iri-krista (wanda kuma aka sani da hanyar saman-iri-crystal, hanyar ɗagawa, da sauransu). Girman girma na crystal a cikinc-axis shugabanci yana da jinkirin, kuma yana da wahala a sami tsayi mai tsayi mai inganci. Haka kuma, ma'aunin lantarki-optic na BBO crystal yana da ƙanƙanta kaɗan, kuma ɗan gajeren crystal yana nufin ana buƙatar ƙarfin ƙarfin aiki mafi girma. A 1995, Goodnoda al. An yi amfani da BBO azaman kayan lantarki don EO Q-modulation na Nd:YLF Laser. Girman wannan kristal BBO shine 3mm × 3mm × 15mm (x, y, z), kuma an karɓi juzu'i. Kodayake girman tsayin tsayin wannan BBO ya kai 5: 1, ƙarfin ƙarfin kwata-kwata har yanzu yana zuwa 4.6 kV, wanda shine kusan sau 5 na EO Q-modulation na LN crystal ƙarƙashin yanayi iri ɗaya.

Don rage ƙarfin aiki, BBO EO Q-switch yana amfani da lu'ulu'u biyu ko uku tare, wanda ke ƙara asarar shigarwa da farashi. Nickelda al. ya rage rabin ƙarfin wutar lantarki na BBO crystal ta hanyar sanya haske ya ratsa cikin crystal na lokuta da yawa. Kamar yadda aka nuna a cikin adadi, katakon Laser yana wucewa ta cikin kristal har sau hudu, kuma jinkirin lokaci da babban madubin tunani da aka sanya a 45 ° ya sami diyya ta farantin igiyar ruwa da aka sanya a cikin hanyar gani. Ta wannan hanyar, ƙarfin rabin-ƙara na wannan BBO Q-switch zai iya zama ƙasa da 3.6 kV.

Hoto 1. BBO EO Q-modulation tare da ƙananan ƙarfin wutar lantarki - WISOPTIC

A 2011 Perlov da al. yayi amfani da NaF azaman juyi don girma crystal BBO tare da tsawon 50mm inc-axis shugabanci, kuma samu BBO EO na'urar da girman 5mm × 5mm × 40mm, kuma tare da Tantancewar uniformity mafi alhẽri daga 1 × 10.^-6 cm^-1, wanda ya dace da bukatun EO Q-switching aikace-aikace. Duk da haka, sake zagayowar ci gaban wannan hanya ya fi watanni 2, kuma farashin har yanzu yana da yawa.

A halin yanzu, ƙarancin ingancin EO coefficient na BBO crystal da wahalar girma BBO tare da girman girma da inganci har yanzu suna ƙuntata aikace-aikacen BBO na EO Q-switching. Duk da haka, saboda babban kofa na lalacewar Laser da ikon yin aiki a babban maimaita mita, BBO crystal har yanzu wani nau'i ne na EO Q-modulation abu tare da mahimmanci mai mahimmanci da kuma makomar gaba.

Hoto 2. BBO EO Q-Switch tare da ƙarancin wutar lantarki mai ƙarancin rabi - Anyi ta WISOPTIC Technology Co., Ltd.