Cascade-Gain-Switching for Generating 3.5-<inline-formula><tex-math notation="LaTeX">$\mu$</tex-math> </inline-formula>m Nanosecond Pulses From Monolithic Fiber Lasers
We propose a novel laser configuration that can output 3.5-<inline-formula><tex-math notation="LaTeX"> $\mu$</tex-math></inline-formula>m nanosecond laser pulses based on a simple and monolithic fiber structure. Cascade-gain-switching (CGS) converts the wavelength o...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2018-01-01
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| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/8470087/ |
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| Summary: | We propose a novel laser configuration that can output 3.5-<inline-formula><tex-math notation="LaTeX"> $\mu$</tex-math></inline-formula>m nanosecond laser pulses based on a simple and monolithic fiber structure. Cascade-gain-switching (CGS) converts the wavelength of nanosecond pulses from 1.55 to 3.5 <inline-formula> <tex-math notation="LaTeX">$\mu$</tex-math></inline-formula>m by two successive gain-switching processes. CGS eliminates the requirement of using bulky free-space modulators for Q-switching. With a well-established theoretical model, we investigated the feasibility of this novel configuration and thoroughly explored its characteristics. In single-shot regime, the pulse width of the 1.55-<inline-formula><tex-math notation="LaTeX">$\mu$</tex-math> </inline-formula>m pump has major impact on the temporal shape of the intermediate 1.97-<inline-formula> <tex-math notation="LaTeX">$\mu$</tex-math></inline-formula>m pulse while has neglected influence on the generated 3.5- <inline-formula><tex-math notation="LaTeX">$\mu$</tex-math></inline-formula>m pulse. On the other hand, increasing the continuous-wave (CW) pump power can significantly improve the output peak power and shorten the pulse when the pump power is less than <inline-formula><tex-math notation="LaTeX">$\sim 4$</tex-math></inline-formula> W. In the repetitive-pulse regime, we found the maximum repetition rate is positively correlated the CW pump power. With a typical CW pump power of 5 W, the 3.5-<inline-formula><tex-math notation="LaTeX">$\mu$</tex-math></inline-formula>m pulse train can be stably outputted when the repetition rate is <inline-formula><tex-math notation="LaTeX">$<=100$ </tex-math></inline-formula> kHz. |
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| ISSN: | 1943-0655 |