基于降温技术的宽范围外腔光栅可调谐半导体激光器

Widely Tunable External Cavity Diode Laser Based on Lower Temperature

使用半导体制冷块,通过优化设计两级制冷系统,并结合隔离、密封等措施,将LD的温度冷却到-20℃,使室温下输出波长为789 nm的激光器工作在780 nm附近,改变了约9 nm。结合外腔光栅反馈技术,可以使激光器的输出波长稳定在Rb原子的D2线上。自制了一个简单的电路,能够以适当的比例同时调谐光栅压电陶瓷的电压和激光器的驱动电流,使激光器可以连续调谐10 GHz以上而不跳模。

By using TEC cooling, and making the design of diode cooling system perfect, and combined with such measmes as quarantining and sealing, the tempratme of LD is cooled to - 20℃. This technique also makes the wavelength reduce from a nominally 789 nm diode to 780.2 nm, a change of nearly 9 nm. It can make the wavelength stable on the D2 atomic transition by the external cavity grating feedback method. The laser is continuously tunable over 10 GHz ranges by simultaneously scanning the voltage of PZT and current source using a simple home-made electronic circuit in an appropriate ratio.