The spectra of Nd$+3$PLU$/ and Pr$+3$PLU$/ doped fiber lasers utilizing two intracore Bragg grating reflectors written at 1084 nm Bragg wavelength have been investigated under 30 MHz resolution. A spectral vernier effect was induced by the subcavities created by reflections from the fiber end faces and from Bragg gratings. We made use of this effect to enhance the sensitivity of the measurement of the fiber temperature rise which arises from absorption of the pump power. Fresnel reflection was also used to reduce the linewidth of the laser emission.
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机译：在30MHz分辨率下，研究了ND $ + 3 $ PLU $ /和PR $ + 3 $ PLU $ /掺杂光纤激光器的PLU $ /掺杂光纤激光器。在30 MHz分辨率下，已经研究了在1084nm布拉格波长的两个腔内布拉格光栅反射器。通过通过光纤端面和布拉格光栅产生的反射产生的子沟槽诱导光谱vernier效应。我们利用这种效果来增强纤维温度升高测量的灵敏度，这引起了泵功率的吸收。菲涅耳反射还用于减少激光发射的线宽。
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