A multi-color spectral fail-safe module based on fiber filtering technique

Dandan Zhou; Xiaocheng Tian; Mengqiu Fan; Rui Zhang

doi:10.1117/12.2656681

16 December 2022 A multi-color spectral fail-safe module based on fiber filtering technique

Dandan Zhou, Xiaocheng Tian, Mengqiu Fan, Rui Zhang

Proceedings Volume 12501, Seventeenth National Conference on Laser Technology and Optoelectronics; 125011J (2022) https://doi.org/10.1117/12.2656681
Event: Seventeenth National Conference on Laser Technology and Optoelectronics, 2022, Shanghai, China

Abstract

In high power laser facilities, phase modulation is required to broaden the laser spectrum, suppressing the SBS buildup in large optics. Spectral fail-safe module is responsible to monitor the spectral bandwidth of every pulse and inhibits the pulse to propagate if phase modulation fails. We demonstrate a multi-color fail-safe module, intentionally induces FM-to-AM conversion on the monitored laser with a fiber filter to convert GHz phase modulation into GHz amplitude modulation that can be measured with an AM detector. By choosing proper fiber filter parameters, the module is applicable to high-power lasers with multiple center wavelengths. In experiment, we achieved fail-safe condition within 1nm detection bandwidth, which can be even larger if a wider bandwidth fiber filter is used. In addition, this module has the advantage to work without temperature control, making it more practical for high-power laser facilities.

Citation Download Citation

Dandan Zhou, Xiaocheng Tian, Mengqiu Fan, and Rui Zhang "A multi-color spectral fail-safe module based on fiber filtering technique", Proc. SPIE 12501, Seventeenth National Conference on Laser Technology and Optoelectronics, 125011J (16 December 2022); https://doi.org/10.1117/12.2656681

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KEYWORDS

Optical filters

Phase modulation

Amplitude modulation

Fiber lasers

High power lasers

Pulsed laser operation

Frequency modulation

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