TY - JOUR
T1 - Experimental study of crystal anisotropy based on ultra-precision cylindrical turning of single-crystal calcium fluoride
AU - Azami, Shunya
AU - Kudo, Hiroshi
AU - Mizumoto, Yuta
AU - Tanabe, Takasumi
AU - Yan, Jiwang
AU - Kakinuma, Yasuhiro
N1 - Funding Information:
The authors gratefully acknowledge technical support from Dr. Katsutoshi Tanaka and Dr. Masahiko Fukuda of TOSHIBA MACHINE CO., LTD. This study was partially supported by the Takahashi Industrial and Economic Research Foundation . The authors would like to express their sincere appreciation for the support.
Publisher Copyright:
© 2014 Elsevier Inc. All rights reserved.
PY - 2015/4/1
Y1 - 2015/4/1
N2 - To realize ultimately efficient signal processing, it is necessary to replace electrical signal processing circuits with optical ones. The optical micro-resonator, which localizes light at a certain spot, is an essential component in optical signal processing. Single-crystal calcium fluoride (CaF2) is the most suitable material for a highly efficient optical micro-resonator. The CaF2 resonator can only be manufactured by ultra-precision machining processes, because its crystal anisotropy does not allow the application of chemical etching. However, the optical micro-resonator's performance depends definitely on the surface integrity. This study investigated the relationship between surface quality after ultra-precision machining and crystal anisotropy. Firstly, crack initiation was investigated on the (1 0 0), (1 1 0), and (1 1 1) planes using the micro-Vickers hardness test. Secondly, brittle-ductile transition was investigated by orthogonal cutting tests. Finally, cutting performance of cylindrical turning was evaluated, which could be a suitable method for manufacturing the CaF2 resonator. The most difficult point in cylindrical turning of CaF2 is that the crystalline plane and cutting direction vary continuously. In order to manufacture the CaF2 optical micro-resonator more efficiently, analysis was conducted on crack initiation and surface quality of all crystallographic orientations from the perspective of slip system and cleavage.
AB - To realize ultimately efficient signal processing, it is necessary to replace electrical signal processing circuits with optical ones. The optical micro-resonator, which localizes light at a certain spot, is an essential component in optical signal processing. Single-crystal calcium fluoride (CaF2) is the most suitable material for a highly efficient optical micro-resonator. The CaF2 resonator can only be manufactured by ultra-precision machining processes, because its crystal anisotropy does not allow the application of chemical etching. However, the optical micro-resonator's performance depends definitely on the surface integrity. This study investigated the relationship between surface quality after ultra-precision machining and crystal anisotropy. Firstly, crack initiation was investigated on the (1 0 0), (1 1 0), and (1 1 1) planes using the micro-Vickers hardness test. Secondly, brittle-ductile transition was investigated by orthogonal cutting tests. Finally, cutting performance of cylindrical turning was evaluated, which could be a suitable method for manufacturing the CaF2 resonator. The most difficult point in cylindrical turning of CaF2 is that the crystalline plane and cutting direction vary continuously. In order to manufacture the CaF2 optical micro-resonator more efficiently, analysis was conducted on crack initiation and surface quality of all crystallographic orientations from the perspective of slip system and cleavage.
KW - Crystal anisotropy
KW - Micro-Vickers
KW - Orthogonal cutting
KW - Single-crystal calcium fluoride
KW - Surface quality
KW - Ultra-precision cylindrical turning
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U2 - 10.1016/j.precisioneng.2014.11.007
DO - 10.1016/j.precisioneng.2014.11.007
M3 - Article
AN - SCOPUS:84922979702
SN - 0141-6359
VL - 40
SP - 172
EP - 181
JO - Precision Engineering
JF - Precision Engineering
ER -