Department of Electro-Optical Engineering, Southern Taiwan University, 1 Nan-Tai St, Yung-Kang City, Tainan County 71005, Taiwan.
Sensors (Basel). 2010;10(11):9609-19. doi: 10.3390/s101109609. Epub 2010 Oct 29.
In this paper we have successfully demonstrated a z-propagating Zn-indiffused lithium niobate electro-optic modulator used for optical heterodyne interferometry. Compared to a commercial buck-type electro-optic modulator, the proposed waveguide-type modulator has a lower driving voltage and smaller phase variation while measuring visible wavelengths of 532 nm and 632.8 nm. We also demonstrate an optical temperature measurement system using a homemade modulator. The results show that the measurement sensitivities are almost the same values of 25 deg/°C for both the homemade and the buck-type modulators for a sensing light with a wavelength of 632.8 nm. Because photorefractive impacts are essential in the buck-type modulator at a wavelength of 532 nm, it is difficult to obtain reliable phase measurements, whereas the stable phase operation of the homemade one allows the measurement sensitivity to be improved up to 30 deg/°C with the best measurement resolution at about 0.07 °C for 532 nm.
在本文中，我们成功演示了一种用于光学外差干涉测量的沿 z 方向传播的 Zn 扩散锂铌酸电光调制器。与商用的降压式电光调制器相比，所提出的波导型调制器在测量 532nm 和 632.8nm 可见波长时具有更低的驱动电压和更小的相位变化。我们还展示了一种使用自制调制器的光学温度测量系统。结果表明，对于波长为 632.8nm 的传感光，自制调制器和降压式调制器的测量灵敏度几乎相同，均为 25°/℃。由于在 532nm 波长下，降压式调制器中的光折变效应至关重要，因此很难获得可靠的相位测量结果，而自制调制器稳定的相位操作可将测量灵敏度提高至 30°/℃，在 532nm 时最佳测量分辨率约为 0.07℃。
