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A Terahertz Wavemeter Based on a Fabry–Perot Interferometer Composed of Two Identical Ge Etalons |
| MIAO Liang**,ZUO Du-Luo,CHENG Zu-Hai |
| Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074 |
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MIAO Liang, ZUO Du-Luo, CHENG Zu-Hai 2012 Chin. Phys. Lett. 29 050701 |
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Abstract A simple and convenient terahertz wavemeter based on a Fabry–Perot interferometer (FPI) is presented. The interferometer is composed of two identical Ge etalons, which act as high-reflectance mirrors for terahertz waves. The transmission characteristics of the Ge FPI are analyzed using multiple-beam interference theory. The theoretical finesse of the FPI, defined as a ratio of 2π to the phase halfwidth of the transmission fringes, is larger than 12.5. Here, the wavemeter is used to measure the wavelengths of an optically pumped NH3 terahertz laser. The experimental results indicate that the measuring uncertainties are within ±1%. Higher accuracy can be expected if the power or pulse energy of the terahertz source is more stable.
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Received: 05 December 2011
Published: 30 April 2012
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| PACS: |
07.60.Ly
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(Interferometers)
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07.57.Pt
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(Submillimeter wave, microwave and radiowave spectrometers; magnetic resonance spectrometers, auxiliary equipment, and techniques)
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42.55.Lt
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(Gas lasers including excimer and metal-vapor lasers)
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