Effect of threshold value on high reflectivity measurement with optical feedback cavity ring-down technique
文献类型：会议论文
| 作者 | Gonga Yuan; Hana Yanling; Li Bincheng |
| 出版日期 | 2009 |
| 会议名称 | Proceedings of SPIE |
| 会议日期 | 2009 |
| 卷号 | 7383 |
| 通讯作者 | Gonga Yuan |
| 中文摘要 | The influence of a predefined threshold value on high reflectivity measurement in an optical feedback cavity ring-down technique (OF-CRD) is investigated. The strong optical feedback from the front cavity mirror of a linear ring-down cavity is re-injected into the oscillator cavity of the diode laser and causes line-width reduction of diode laser. The narrowed laser line is occasionally in resonance with one or more ring-down cavity modes and large resonant peaks are observed in the ring-down cavity output signals. The diode laser is switched off at the negative step of the square-wave modulation signal. If the amplitude at the negative step exceeds the pre-defined threshold value, an exponential decay signal is recorded to fit the cavity decay time. The reflectivity of the cavity mirror is determined statistically to be 99.9907±0.0002% and 99.9899±0.0004% with threshold values of 350mV and 50mV, respectively. All reflectivities measured at six cavity lengths with a higher threshold are more precise than that measured with the lower threshold. A method to determine the threshold value is proposed for accurate high reflectivity measurement. |
| 英文摘要 | The influence of a predefined threshold value on high reflectivity measurement in an optical feedback cavity ring-down technique (OF-CRD) is investigated. The strong optical feedback from the front cavity mirror of a linear ring-down cavity is re-injected into the oscillator cavity of the diode laser and causes line-width reduction of diode laser. The narrowed laser line is occasionally in resonance with one or more ring-down cavity modes and large resonant peaks are observed in the ring-down cavity output signals. The diode laser is switched off at the negative step of the square-wave modulation signal. If the amplitude at the negative step exceeds the pre-defined threshold value, an exponential decay signal is recorded to fit the cavity decay time. The reflectivity of the cavity mirror is determined statistically to be 99.9907±0.0002% and 99.9899±0.0004% with threshold values of 350mV and 50mV, respectively. All reflectivities measured at six cavity lengths with a higher threshold are more precise than that measured with the lower threshold. A method to determine the threshold value is proposed for accurate high reflectivity measurement. |
| 收录类别 | EI |
| 语种 | 英语 |
| 源URL | [http://ir.ioe.ac.cn/handle/181551/7843]  |
| 专题 | 光电技术研究所_薄膜光学技术研究室（十一室） |
| 作者单位 | 中国科学院光电技术研究所 |
| 推荐引用方式 GB/T 7714 | Gonga Yuan,Hana Yanling,Li Bincheng. Effect of threshold value on high reflectivity measurement with optical feedback cavity ring-down technique[C]. 见:Proceedings of SPIE. 2009. |
入库方式： OAI收割
来源：光电技术研究所
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