Average optical power monitoring in micromirrors

被引：10

作者：

Supino, RN ^{[1
]}

Talghader, JJ ^{[1
]}

机构：

[1] Univ Minnesota, Dept Elect & Comp Engn, Minneapolis, MN 55455 USA

来源：

IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS | 2002年 / 8卷 / 01期

关键词：

heat transfer; micromirrors; power monitoring;

D O I：

10.1109/2944.991394

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The thermal properties of tip-tilt micromirrors have been analyzed theoretically and measured experimentally for devices operated in air and in vacuum. Typical micromirror thermal conductances are shown to range from 10(-3) W/K for devices operated close to the substrate in air to 10(-5) W/K for devices operated in a vacuum. These results demonstrate that micromirror temperatures are extremely sensitive to the average optical signal incident upon them and can be used as probes of incident power in much the same way as thermal infarred detectors. This has been experimentally demonstrated using a lambda = 661 nm diode laser with polysilicon micromirrors, and sensitivities reaching below 70 nW of absorbed optical power, limited by the Johnson and 1/f noise of the micromirrors and measurement system. Average optical power monitoring could be useful in large cross connects or other applications, where the additional integration of a tap/beamsplitter plus photodiode assembly is undesirable.

引用

页码：12 / 18

页数：7

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