ND:YAG در ليزر رزينه اي با دمش به وسيله هماهنگ دوم ليزر SFUR كاربرد تشديدگر ناپايدار خودپالاينده

Nd:YAG (2(0) Pumped Dye Laser Using Self-Filtering Unstable Resonator (SFUR)

A self-filtering unstable resonator (SFUR)with a magnification ofM=-3 in a Nd:YAG(2w)dye laser has been studied. The dye solution is Rhodamine 6G in alcohol with the concentration of 5 *lO-3 Mol/lit. The spatial intensity distribution of the resonator has been compared with that of a plane-parallel (PP) resonator of equal length. The output energy in both configurations are comparable (20 uJ ,and 26uJ respectively). A significant difference between these two resonators is the laser beam divergence, where beam divergences of 0.77 mrad for the SPUR and 1.6mrad for the plane-parallel resonator have been measured. The brightness corresponding to these two resonators are 1.5* 1011 and 2.2* 10-10 W.cm -2.Srʹ -1, and the pulse widths are 7 and 17 ns, respectively. These figures show clearly that laser resonator based on the SPUR design can increase the laser brightness by a factor of 10,with a beam divergence of a fraction of mrad, compared with the plane-parallel resonator. In order to describe the dynamic behavior of the SPUR design, a numerical calculation based on the rate equations have been used and a good consistency with the experiment has been obtained.