AgGaSe2 晶體紅外上轉換在紅外超拉曼光譜測量中的應用

Abstract

本文主要是描述利用AgGaSe2晶體紅外上轉換,以測量鉀蒸汽原子之遠紅外 光譜.我們以可調諧的染料雷射為光泵,使得鹼金屬鉀蒸汽原子,分別激發 至 8S1/2 和 6D3/2 激發態.在眾多輻射譜線中,先用AgGaSe2晶體將遠紅 外譜線與一紅外譜線(1.5167um)和頻而上轉換至近紅外.然後,再用 B-BBO 晶體在染料雷射光泵進行紅外上轉換,而使近紅外光變成可見光,然後利用 高靈敏度的光電倍增管偵測.並且對上轉換的可見光譜近作了分析和討論. 在本文中我們也系統地敘述了對AgGaSe2晶體特性研究至今所發表的結果. In this thesis the application of up-conversion with a AgGaSe2 crystal on the measurements of far infrared spectra for potassium atom is described.The potassium atoms are first excited from the 4S state to 8S1/2 or 6D3/2 state by a dunable dye-laser.Many spontaneous emissions are expected infrared or visible rnage.In the AgGaSe2 crystal one of far infrared emission is combined with a near IR emission (1.5167um) which is from the transition 4F3/2 - 3D3/2 of potassium atoms and up-converted into the NIR range.Then the up-converted NIR emission is up-converted again into the visible with the B-BBO crystal,pumped by the dye-laser which is used in the excitation of potassion. The double up- converted,visible spectra are analyzed and discussed. In this thesis we also survey the results on the properties of the AgGaSe2 crystal,which were published in the past two decades.