To make a purple or violaceous laser beam emit efficiently also at room temperatures, by a method in which a purple light emission, which is accompanied by a transition to the specified state of neodymium ions, is used on the basis of an excitation of the neodymium ions from its ground state to a specified energy level.
ND3+ is excited from its ground state (4I9/2) to an energy level (2H9/2+4F5/2) and goes through two factors or more of excitations to utilize a purple light emission, which is finally generated by a transition from the state of 4D3/2) of the ND3+ to the state of 4I11/2 of the ND3+. Here, in an ND3+- containing chloride crystal, an absorption, which is accompanied by the excitation of the ND3+ from the ground state (4I9/2) to the energy level (2H9/2+4F5/2), is seen in the extent of about 790 to 830nm and the strongest absroption is seen in the vicinity of 810nm. As a compound which is used as a laser medium, the chloride crystal containing the ND3+ as its luminous ions or a chloride glass is proper. Thereby, a purple light emission in the vicinity of 390nm or a violaceous light emission in the vicinity of 415nm can be efficiently obtained at room temperatures using a laser beam in the vicinity of 800nm ans its excitation source.
HANAUE YASUHIRO
OKUBO AKIRA
SHIRAISHI HIROYUKI
Next Patent: DISTRIBUTION FEEDBACK TYPE SEMICONDUCTOR LASER