کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1539720 | 996643 | 2010 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A theoretical investigation of wedged capacitive strip-grating output couplers for optically pumped terahertz lasers
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The output power for terahertz lasers influenced drastically by slight changes in the transmittance of the output coupler for a certain terahertz frequency has been discussed in the paper. Therefore it is necessary to design an output coupler whose transmittance does not rapidly modulate with frequency. To obtain the flat and accurate transmittance spectrum in a narrow wavenumber interval (say 3Â cmâ1), a wedged output coupler is proposed. This conclusion has been revealed after analyzing the disadvantages of two types of capacitive strip-grating output couplers, and theoretically studying its transmission properties. The theoretical results show that the coupler can not only provide flat and accurate transmittance spectrum and thus effectively suppress the etalon effects occurring frequently in previous experiments but also thoroughly eliminate the transmittance sensitivity to the slight shift of substrate thickness. Moreover, the wedged substrate of the improved output coupler can be used repeatedly in the process of adjusting the strip-grating parameters to meet various transmittance requirements for optically pumped terahertz lasers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics Communications - Volume 283, Issue 4, 15 February 2010, Pages 574-578
Journal: Optics Communications - Volume 283, Issue 4, 15 February 2010, Pages 574-578
نویسندگان
Chunchao Qi, Duluo Zuo, Fanqi Meng, Jian Tang, Zuhai Cheng,