高效率低阈值Nd：S－FAP晶体激光特性

LASER CHARACTERISTICS OF LOW THRESHOLD HIGH EFFICIENCY Nd:S-FAP CRYSTAL

测量了新型晶体Ｎｄ：Ｓ－ＦＡＰ［Ｎｄ：Ｓｒ＿５（ＰＯ＿４）＿３Ｆ］的吸收光谱特性，它具有宽的有效吸收带，在５７５．０ｎｍ和８０５．４ｎｍ处有二个强的吸收峰．用可调谐染料激光器测量了５７５．０ｎｍ处的吸收系数为１９．７ｃｍ￣（－１），用波长为５７５．０ｎｍ的的染料激光作泵浦源，实现了１．０５９μｍ的全偏振光输出，最低闽值为２．５ｍＪ，斜效率为４９％。用ＫＴＰ倍频获得的绿光的波长为０．５２９５μｍ，峰值半宽度为１．０ｎｍ。

The absorption spectrum of a new crystal Nd:S-FAP(Nd:Sr5(PO4)3F)was measured,which showed that it had broad effective band and two strong absorption peaks at 575.0nm and 804.5nm.By using tunable dye-laser,a absorption coefficient of 2 0 cm-1 at 5 7 5.0 nm was measured.Using atunable dye-laser(575.0nm)as pump source,we have realized the performance of total polarized laserat 1.059μm. The lowest threshold energy is 2.5mJ and the highest slope efficiency is 49%. Thewavelength of frequency-doubling laser is 0.5925μm and the linewidth is 1.0nm.