An Er/Yb co-doped double cladding fiber laser pumped at 980 nm was optimized. The double-cladding fiber laser with
whole fiber was obtained by end-pumping and utilizing fiber bragg grating as a resonator. The output power of laser was
analyzed along the changes of output grating reflectance (L=10m) as well as the fiber length (R2=4%). Consequently, a
fiber with 4 m Er / Yb co-doped double cladding was employed as gain medium while a fiber of which the reflectance
was approximately 15% was used as output resonator mirror. Thereafter the technical indexes of EYDF(Er / Yb Double
cladding Fiber) were measured. The absorption maximum of fiber core Er3+ was higher than 30dB/m and material gain
maximum was observed at 1535nm. Moreover, the diameters of fiber core and inner cladding of double-cladding fiber
grating were 6μm and 125μm respectively however the diameters of fiber core and inner cladding of Er/Yb co-doped
double cladding fiber were 7μm and 130μm separately.According to the experimental data, a fiber laser with 4 m Er / Yb
co-doped double cladding and launched maximum pump power of 3.4 W was set up. Proposed laser shows the
maximum output power of 1.25 W and slope efficiency of 40%.
Collimator is an important equipment with high accuracy in optical experiment and measuement. In order to improve
measuring accuracy, based on the particular aberration property of diffraction optical element, hybrid refractivediffractive
aberration correction method is put forward. In this paper, a hybrid refractive-diffractive method is compared
with conventional method with 80mm diameter, 500mm focal length and 550mm overall length. The resolution is less
than 4.3". Having been optimized, the maximum spot is 5.2μm, and the modulation transfer function (MTF) at
50lp/mm is over 0.8, better than conventional method.
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