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Proceedings Paper

Single-frequency pulsed fiber lasers at ~1.5 µm and fiber-based narrow linewidth THz sources
Author(s): Wei Shi; Eliot B. Petersen; Dan T. Nguyen; Jie Zong; Zhidong Yao; Arturo Chavez-Pirson; Nasser Peyghambarian
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Paper Abstract

We have implemented monolithic narrow linewidth single-mode single-frequency pulsed fiber lasers in master oscillator and power amplifier (MOPA) configuration based on highly Er/Yb co-doped phosphate fiber with core size of 25 μm. The narrow linewidth pulsed fiber laser seed has been achieved by directly modulating single-frequency CW fiber laser. An arbitrary waveform generator (AWG) was used to pre-shape the pulse shapes in order to avoid the pulse distortion and the dynamic gain saturation in the cascade fiber amplifiers. Based on the newly developed large core single-mode highly Er/Yb co-doped phosphate fiber in the power amplifier stage, the peak power of single-mode pulses can be scaled to more than 100 kW with transform-limited linewidth and diffraction-limited beam quality. These high power narrow linewidth single-mode fiber laser pulses have been successfully used to generate coherent THz waves based on difference-frequency generation (DFG) in GaSe crystal. The single-pass generated THz peak power can reach 0.12 W. Moreover, we have observed the external cavity enhancement of DFG THz generation by using ZnGeP2 for the first time, and implemented a high spectral resolution THz spectrometer based on the developed fiber-based tunable narrow linewidth THz source.

Paper Details

Date Published: 17 February 2010
PDF: 9 pages
Proc. SPIE 7582, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IX, 75820V (17 February 2010); doi: 10.1117/12.835982
Show Author Affiliations
Wei Shi, NP Photonics, Inc. (United States)
Eliot B. Petersen, NP Photonics, Inc. (United States)
The Univ. of Arizona (United States)
Dan T. Nguyen, NP Photonics, Inc. (United States)
Jie Zong, NP Photonics, Inc. (United States)
Zhidong Yao, NP Photonics, Inc. (United States)
Arturo Chavez-Pirson, NP Photonics, Inc. (United States)
Nasser Peyghambarian, NP Photonics, Inc. (United States)
College of Optical Sciences, The Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 7582:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IX
Peter E. Powers, Editor(s)

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