本文選題：Er~(3+)摻雜 + 微晶玻璃�。� 參考：《南京郵電大學(xué)》2017年碩士論文

【摘要】：近年來,中紅外波段激光的應(yīng)用已深入到日常生活的方方面面,主要有激光手術(shù)、激光雷達、激光測距、激光傳感等。目前對于中紅外波段激光增益介質(zhì)的研究主要集中在稀土摻雜玻璃、透明陶瓷及晶體。對于稀土摻雜玻璃材料的研究,目前主要集中在氟化物玻璃,而氟化物玻璃物理化學(xué)穩(wěn)定性比較差,且制備工藝較復(fù)雜。傳統(tǒng)氧化物玻璃相對于氟化物玻璃,物理化學(xué)穩(wěn)定性更好、制備工藝更簡單以及對環(huán)境污染性小,然而稀土離子在氧化物玻璃基質(zhì)中的中紅外發(fā)光效率較低,主要原因在于氧化物玻璃相對于氟化物玻璃來說,其聲子能量較高,通過多聲子輔助非輻射躍遷降低了稀土離子的發(fā)光效率。本課題的主要目的在于降低傳統(tǒng)氧化物玻璃的聲子能量來提高鉺離子的發(fā)光效率。本文的研究內(nèi)容及研究結(jié)果如下:1.在硅酸鹽玻璃中引入氟化物,使玻璃基質(zhì)有較低的聲子能量。通過計算其J-O參數(shù)得出通過引入氟化物之后,玻璃的Ω4相比于硅酸鹽玻璃降低了,得出氟離子進入玻璃體系中,通過替代氧離子,降低了玻璃中鉺離子周圍場環(huán)境的對稱性,獲得了2.7μm的熒光。通過計算得出玻璃在1550 nm和2700 nm處的最大增益分別為0.21~(x)10-20cm~2和1.31~(x)10-20cm~2。2.對氟硅酸鹽玻璃進行微晶化處理,熱處理溫度選取在玻璃析晶溫度和轉(zhuǎn)變溫度范圍內(nèi)的幾個點,分別為660℃、680℃、700℃、720℃、840℃,隨著熱處理溫度的升高,玻璃的透過率逐漸下降,通過XRD數(shù)據(jù)得到玻璃中析出的晶體為CaF_2晶體,且其尺寸隨著溫度的升高從32.7 nm到51.2 nm;鉺離子的近紅外及中紅外波段的發(fā)光強度逐漸增強,在2.7μm處的發(fā)光增強了2倍多。通過在700℃熱處理在玻璃中析出CaF_2晶體,而玻璃仍能保持較高的透過率(84%);采用XRD測試及計算CaF_2晶體尺寸為32.7 nm。通過研究不同時間熱處理情況下鉺離子在氟硅酸鹽玻璃中的發(fā)光性能,得出最佳的熱處理工藝為在700℃下保溫2h。3.研究并制備了氟磷酸鹽玻璃,對氟磷酸鹽玻璃的熱穩(wěn)定性進行了分析,在玻璃的析晶溫度附近對玻璃進行熱處理,分析熱處理對氟磷酸鹽玻璃的中紅外熒光發(fā)光影響。熱處理溫度分別為450℃、470℃、490℃、510℃、530℃,結(jié)果證實,在熱處理的過程中,氟磷酸鹽玻璃中析出了低聲子能量的CaF_2、SrF_2晶體以及一些其他的低聲子能量的微納米晶體,降低了鉺離子周圍的聲子場能量,增強了Er~(3+)在近紅外和中紅外的熒光強度。通過研究不同溫度及不同時間下的熱處理結(jié)果,得出最佳的熱處理溫度為在510℃下保溫2h。
[Abstract]:In recent years, the application of mid-infrared laser has been deep into every aspect of daily life, including laser surgery, laser radar, laser ranging, laser sensing and so on. At present, the study of laser gain medium in the middle infrared band is mainly focused on rare earth doped glass, transparent ceramics and crystal. The research of rare earth doped glass is mainly focused on fluoride glass, but the physical and chemical stability of fluoride glass is poor, and the preparation process is complex. Compared with fluoride glass, traditional oxide glass has better physical and chemical stability, simpler preparation process and less environmental pollution. The main reason is that the phonon energy of oxide glass is higher than that of fluoride glass, and the luminescence efficiency of rare earth ions is reduced by multi-phonon assisted non-radiative transition. The main purpose of this thesis is to improve the luminescence efficiency of erbium ions by reducing the phonon energy of traditional oxide glasses. The contents and results of this paper are as follows: 1. The introduction of fluoride into silicate glass makes the glass matrix have lower phonon energy. Through the calculation of J-O parameters, it is found that the 惟 _ 4 of glass is lower than that of silicate glass after the introduction of fluoride, and the symmetry of field environment around er ~ (3 +) in glass is reduced by substituting oxygen ion for fluorine ions in glass system. The fluorescence of 2.7 渭 m was obtained. The maximum gain of the glass at 1550 nm and 2700 nm was calculated to be 0.21~(x)10-20cm~2 and 1.31 ~ (-1) ~ (10) cm ~ (-1) ~ (-1) cm ~ (-1) ~ (2) ~ (2) ~ (2), respectively. Fluorosilicate glass was treated with glass-ceramics. The heat treatment temperature was selected as several points in the range of crystallization temperature and transition temperature, which were 660 鈩，

本文編號：1946054