| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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An Efficient Pulsed CH3OH Terahertz Laser Pumped by a TEA CO2 Laser |
| JIU Zhi-Xian, ZUO Du-Luo, MIAO Liang, QI Chun-Chao, CHENG Zu-Hai |
| Wuhan National Laboratory for Optoelectronics, College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074 |
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| Cite this article: |
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JIU Zhi-Xian, ZUO Du-Luo, MIAO Liang et al 2010 Chin. Phys. Lett. 27 024211 |
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Abstract An efficient pulsed CH3OH terahertz (THz) laser pumped by a TEA CO2 laser is investigated experimentally. To improve photon conversion efficiency and THz laser energy, two cavity configurations of the TEA CO2 laser, which is external and semi-external, are evaluated. The pump intensities are about 4.7 MW/cm2 and 1.2 MW/cm2, respectively. Higher pump intensity and more stable single lines are obtained in the external cavity. For the 3.8 J pump energy of the 9P(16) transition in the external cavity, the maximum terahertz output energy with 570.5 μm wavelength at 160 Pa is 431 μJ. With a 6 J energy pulse in terms of a semi-external cavity, a 353 μJ terahertz emission (570.5 μm) is produced. The corresponding photon conversion efficiencies are 1.36% and 0.705%, increasing by a factor of about 2.
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| Keywords:
42.55.Lt
07.57.Hm
33.80.Be
82.53.Kp
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Received: 04 September 2009
Published: 08 February 2010
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| PACS: |
42.55.Lt
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(Gas lasers including excimer and metal-vapor lasers)
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07.57.Hm
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(Infrared, submillimeter wave, microwave, and radiowave sources)
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33.80.Be
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(Level crossing and optical pumping)
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82.53.Kp
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(Coherent spectroscopy of atoms and molecules)
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