NDLI: Study of $HfO_{2}/SiO_{2}$ dichroic laser mirrors with refractive index inhomogeneity

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Zhang, Jinlong Wang, Zhanshan Jiao, Hongfei Han, Jin Bao, Ganghua Trubetskov, M. Tikhonravov, Alexander V. Cheng, Xinbin
Abstract	$ HfO _{ 2 } / SiO _{ 2 } $ dichroic mirrors, having high reflectance at 1064 nm and high transmittance at 532 nm, play an important role in high-power laser systems. However, the half-wave hole effect, caused mainly by the refractive index inhomogeneity of hafnia, affects the spectra and application of these mirrors. Two approaches to eliminate the half-wave hole effect have been proposed. Both approaches attempt to shift the location of the half-wave hole in comparison with the original wavelength. One approach broadens the reflectance band of the first harmonic wavelength and simultaneously adjusts the central reflectance band to a longer wavelength, whereas the other approach combines the two stacks to adjust the location of the half-wave hole far away from the wavelength of interest. Two kinds of dichroic mirrors have been successfully fabricated; moreover, it was found that the method of a two-stack combination, $ 0.9 ( HL ) ^{ 8 } $ and $ 1.1 ( HL ) ^{ 8 } $ , provides designs that can be fabricated more easily and with better quality spectral characteristics.
ISSN	1559128X
Volume Number	53
Journal	Applied Optics
Issue Number	4
e-ISSN	21553165
Language	English
Publisher	Optical Society of America
Publisher Date	2014-02-01
Publisher Place	United States
Access Restriction	Subscribed
Subject Keyword	Optics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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