Single-frequency pulsed fiber lasers at ~1.5 µm and fiber-based narrow linewidth THz sources

Wei Shi; Eliot B. Petersen; Dan T. Nguyen; Jie Zong; Zhidong Yao; Arturo Chavez-Pirson; Nasser Peyghambarian

doi:10.1117/12.835982

17 February 2010 Single-frequency pulsed fiber lasers at ~1.5 µm and fiber-based narrow linewidth THz sources

Wei Shi, Eliot B. Petersen, Dan T. Nguyen, Jie Zong, Zhidong Yao, Arturo Chavez-Pirson, Nasser Peyghambarian

Proceedings Volume 7582, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IX; 75820V (2010) https://doi.org/10.1117/12.835982
Event: SPIE LASE, 2010, San Francisco, California, United States

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.

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Wei Shi, Eliot B. Petersen, Dan T. Nguyen, Jie Zong, Zhidong Yao, Arturo Chavez-Pirson, and Nasser Peyghambarian "Single-frequency pulsed fiber lasers at ~1.5 µm and fiber-based narrow linewidth THz sources", Proc. SPIE 7582, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IX, 75820V (17 February 2010); https://doi.org/10.1117/12.835982

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KEYWORDS

Terahertz radiation

Fiber lasers

Pulsed fiber lasers

Spectroscopy

Fiber amplifiers

Crystals

Modulation

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