Generation of broadband frequency-variable laser comb allowing full-frequency sweep in the near-infrared region
| Autor: | Ken Kashiwagi, Motohiro Koriba, Tatsutoshi Shioda, Takuma Serizawa, Mitsutaka Ito, Takashi Kurokawa, Yosuke Tanaka |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Physics::Optics 02 engineering and technology 01 natural sciences Sweep frequency response analysis law.invention 010309 optics Optical pumping Optics law 0103 physical sciences Physics::Atomic Physics Electrical and Electronic Engineering Physical and Theoretical Chemistry business.industry 021001 nanoscience & nanotechnology Laser Pulse shaping Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Wavelength Amplitude Optical modulator 0210 nano-technology business Frequency modulation |
| Zdroj: | Optics Communications. 438:13-17 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/j.optcom.2018.12.086 |
| Popis: | We succeeded in developing a broadband-frequency-variable laser comb with a mode spacing of 12.5 GHz in the near-infrared region. We found that the spectrum of optical pump pulses can be frequency shifted over the mode spacing frequency by a single-sideband (SSB) optical modulator involving the amplitude and phase. Optical heterodyne measurement showed that the frequency shift of the optical pump pulses was precisely consistent with the modulation frequency applied to the SSB modulator with an accuracy of 20 kHz. The pump pulses were amplified and compressed to enhance the peak intensity. Finally, the frequency-shifted pump pulses launched into highly nonlinear fibers and generated a frequency-shifted laser comb. The precise frequency shift of pump pulses induced a simultaneous frequency shift of all modes of the laser comb. As a result, we succeeded in fast frequency sweeping of the laser comb over a full spectral range of 1080 to 1750 nm. This full-wavelength tuning implies that laser light of arbitrary and accurate wavelength can be obtained over the comb bandwidth. |
| Databáze: | OpenAIRE |
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