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首页> 外文期刊>Journal of Lightwave Technology >Switchable Dual-Wavelength Mode-Locked Fiber Laser Source for In-PCF Parametric Frequency Conversion Applied to CARS Microscopy
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Switchable Dual-Wavelength Mode-Locked Fiber Laser Source for In-PCF Parametric Frequency Conversion Applied to CARS Microscopy

机译：用于PCS显微镜中In-PCF参数频率转换的可切换双波长锁模光纤激光源

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摘要

A self-started, switchable dual-wavelength allpolarization-maintaining mode-locked (ML) fiber laser for optical parametric generation (OPG) in photonic crystal fiber (PCF) applied to coherent anti-stokes Raman scattering (CARS) microscopy is reported in this paper. The complete laser setup is built in an all-fiber structure composed of commercial elements. It is based on a linear cavity with an active medium-namely, Ytterbium-doped fiber (YDF), a pair of fiber Bragg gratings as switchable partial mirrors between 1031.5 and 1049.7 nm, and a semiconductor saturable absorber mirror functioning also as the mode-locking device. The seed laser is amplified to 650 mW average power by two YDF amplifiers. The source delivers a pulse-train output of 30.9 ps at 1031.5 ps and 31.6 ps at 1049.7, a 3.1-MHz repetition rate, and over 200 nJ pulse energy and 6 kW of peak power at fundamental ML operation. The properties of this switchable dual-wavelength source ensures the correct OPG by degenerated four-wave mixing in PCF fulfilling the phase matching condition which corresponds to CARS resonance of 2850 cm(-1) (CH3-O molecular bonds) at 1031.5 nm and 1475 cm(-1) (CH2 delta molecular bonds) at 1049.7 nm.
机译：本文报道了一种自启动，可切换的双波长全偏振保持锁模（ML）光纤激光器，该激光器用于光子晶体光纤（PCF）中的光参量生成（OPG），适用于相干抗斯托克斯拉曼散射（CARS）显微镜纸。完整的激光装置建立在由商业元素组成的全光纤结构中。它基于具有有源介质的线性腔，即掺Y光纤（YDF），一对光纤布拉格光栅作为1031.5和1049.7 nm之间的可切换部分反射镜，以及半导体可饱和吸收器镜，还具有以下功能：锁定设备。种子激光被两个YDF放大器放大到650 mW的平均功率。该信号源在1031.5 ps时提供30.9 ps的脉冲串输出，在1049.7时提供31.6 ps的脉冲串输出，重复频率为3.1 MHz，在基本ML操作下提供超过200 nJ的脉冲能量和6 kW的峰值功率。此可切换双波长光源的特性可通过在PCF中进行简并四波混频来确保正确的OPG，从而满足相位匹配条件，该条件对应于在1031.5 nm和1475处2850 cm（-1）（CH3-O分子键）的CARS共振cm（-1）（CH2δ分子键）在1049.7 nm。

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