The effects of working pressure on the properties of 355nm Al2O3/MgF2 HR coatings were investigated. A series of
samples were deposited by electron beam evaporation using the same deposition process at different working pressure.
Transmittance of the HR coatings was measured by Lambda 900 spectrometer. Structure of the samples had been
characterized by X-ray diffraction (XRD).The stress was measured by viewing the substrate deformation before and after
coatings deposition using an optical interferometer, the stress results range from 223MPa to 315MPa. Laser-induced
damage threshold (LIDT) was measured by a 351 nm Nd:YAG laser with a pulse width of 7 ns, the LIDT results range
from 2.69 J/cm2 to 11.03 J/cm2 with the working pressure changing. It was found that working pressure has important
effects on the absorption, stress and LIDT of 355nm Al2O3/MgF2 HR coatings. (351nm, 7ns).The working pressure was
no clear effect on the crystalline structure of the HR coatings.
A new method for side-pumping double-cladding fiber was researched. A quartz column of 3mm length was cut away from D-shape double-cladding fiber which has a transverse sectional dimension of 350μm×400μm. Then the column-fiber coupler was fabricated by gluing the column onto the side of inner cladding . The pumping light was coupled into the inner cladding from the end of the D-shape quartz column. When the output power was 1.3W from the forward end of the coupler, the optimum efficiency is 85%. This method can be suitable for pumping the fiber laser and amplifier of several watts output power.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.