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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish (US)
Title of host publicationNonlinear Frequency Generation and Conversion
Subtitle of host publicationMaterials, Devices, and Applications IX
DOIs
StatePublished - May 7 2010
EventNonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IX - San Francisco, CA, United States
Duration: Jan 25 2010Jan 28 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7582
ISSN (Print)0277-786X

Other

OtherNonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IX
CountryUnited States
CitySan Francisco, CA
Period1/25/101/28/10

Keywords

  • Fiber amplifier
  • Fiber laser
  • Fiber optics amplifiers and oscillators
  • Pulses
  • Terahertz

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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