Frequency stabilization of blue extended cavity diode lasers by external cavity optical feedback
Frequency stabilization of blue extended cavity diode lasers by external cavity optical feedback
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DOI：
10.1007/s00340-011-4705-y
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发表时间：
2012-02-01
影响因子：
2.1
通讯作者：
Burrows, J. P.
中科院分区：
文献类型：
--
作者：
Horstjann, M.;Nenakhov, V.;Burrows, J. P.
为这项研究开发的高精细度V型谐振腔的光反馈导致与扩展腔二极管激光器的有效耦合，稳定其发射频率并大大降低激光线宽。这又增强了谐振器的输出功率，从而在用于通过吸收光谱法检测气相物质时提高了信噪比。这种效果是直接测量外差两个扩展腔二极管激光器在409 nm的波长与和没有从高精细度V-谐振器的光反馈的影响。自由运行的激光器的外差信号由一组尖峰组成，其包络在80 MHz/0.8 s的扫描速率下显示约4.5 MHz的宽度，导致3 MHz的激光线宽。来自高精细度V型谐振腔的光反馈将外差信号降低到平均宽度为10 kHz的单个峰值，从而导致激光线宽为7 kHz。这是迄今为止报道的在该波长区域工作的二极管激光器的线宽的最低值。
Optical feedback from a high-finesse V-resonator, developed for this study, results in efficient coupling with an extended cavity diode laser, stabilizing its emission frequency and strongly decreasing the laser linewidth. This in turn enhances resonator output power, thus increasing the signal-to-noise ratio when used for the detection of gas phase species by absorption spectroscopy. This effect was directly measured by heterodyning two extended cavity diode lasers at a wavelength of 409 nm with and without the influence of optical feedback from a high-finesse V-resonator. The heterodyne signal of freely running lasers is composed of a set of sharp peaks whose envelope shows a width on the order of 4.5 MHz at a sweep rate of 80 MHz/0.8 s, leading to a laser linewidth of 3 MHz. Optical feedback from the high-finesse V-resonator reduces the heterodyne signal to a single peak with a mean width of 10 kHz, leading to a laser linewidth of 7 kHz. This is the lowest value of linewidth, reported thus far, for diode lasers operating in this wavelength region.