Manzoor Shamaila, Tinsley Jonathan N, Bandarupally Satvika, Chiarotti Mauro, Poli Nicola
Opt Lett. 2022 May 15;47(10):2582-2585. doi: 10.1364/OL.457979.
We present a novel high-power, frequency-stabilized UV laser source at 326.2 nm, resonant with the Cd S-P narrow intercombination transition. We achieve a maximum produced power of 1 W at 326.2 nm by two successive frequency doubling stages of a narrow-linewidth (<1 kHz) seed laser at 1304.8 nm. Approximately 3.4 W of optical power at 652.4 nm is produced by a visible Raman fiber amplifier (VRFA) that amplifies and generates the second harmonic of the infrared radiation. The visible light is subsequently frequency-doubled down to 326.2 nm in a nonlinear bow-tie cavity using a Brewster-cut beta-barium-borate (BBO) crystal, with a maximum conversion efficiency of approximately 40% for 2.5 W of coupled red power. Full characterization of the laser source, together with spectroscopy signals of all Cd isotopes, spanning more than 4 GHz in the UV, are shown.
我们展示了一种新型的高功率、频率稳定的326.2 nm紫外激光源，它与硫化镉的S-P窄间组合跃迁共振。我们通过对1304.8 nm窄线宽（<1 kHz）种子激光进行两级连续倍频，在326.2 nm处实现了1 W的最大输出功率。一个可见拉曼光纤放大器（VRFA）产生了约3.4 W的652.4 nm光功率，该放大器对红外辐射进行放大并产生其二次谐波。随后，可见光在一个非线性领结腔中使用布儒斯特切割的β-硼酸钡（BBO）晶体倍频至326.2 nm，对于2.5 W的耦合红光功率，最大转换效率约为40%。展示了激光源的全面特性，以及所有镉同位素在紫外波段超过4 GHz的光谱信号。
