Sheng Xin, Tawy Goronwy, Sathian Juna, Minassian Ara, Damzen Michael J
Opt Express. 2018 Nov 26;26(24):31129-31136. doi: 10.1364/OE.26.031129.
High resolution spectroscopy, metrology and quantum technologies (e.g. trapping and cooling) require precision laser sources with narrow linewidth and wavelength tunability. The widespread use of these lasers will be promoted if they are cost-effective, compact and efficient. Alexandrite lasers with a broad tuning band pumped efficiently by low-cost red diodes are a potential candidate, but full performance as a precision light source has not been fully achieved. We present in this work the first continuous-wave (CW) and single-frequency operation of a unidirectional diode-end-pumped Alexandrite ring laser with wavelength tunability. An ultra-compact bow-tie ring cavity is developed with astigmatic compensation and a novel 'displaced mode' design producing CW output power > 1 W in excellent TEM mode (M < 1.2) when using a low brightness pump (M ≥ 30). Wavelength tuning from 727 - 792 nm is demonstrated using a birefringent filter plate. This successful operation opens the prospects of precision light source applications.
高分辨率光谱学、计量学和量子技术（例如俘获与冷却）需要具有窄线宽和波长可调性的精密激光源。如果这些激光器具有成本效益、结构紧凑且效率高，那么它们的广泛应用将得到推动。由低成本红色二极管高效泵浦且具有宽调谐波段的翠绿宝石激光器是一个潜在候选者，但作为精密光源的全部性能尚未完全实现。我们在这项工作中展示了具有波长可调性的单向二极管端面泵浦翠绿宝石环形激光器的首次连续波（CW）和单频运转。开发了一种超紧凑的蝴蝶结环形腔，具有像散补偿和新颖的“位移模式”设计，当使用低亮度泵浦（M≥30）时，能在优异的TEM模式（M<1.2）下产生大于1W的连续波输出功率。使用双折射滤光片展示了从727 - 792nm的波长调谐。这一成功运转为精密光源应用开辟了前景。
