| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative dispersion mirror which can generate large negative group-velocity dispersion and can be used as an output mirror of a solid-state laser apparatus. SOLUTION: In a mirror 5 including a dielectric multilayer coating structure 7 formed on a substrate 6, the multilayer coating structure includes two mirror-function layer portions ML<SB>1</SB>and ML<SB>2</SB>, each formed by a plurality of layers deposited one on another, and a cavity layer C that is arranged between the two mirror-function layer portions ML1 and ML<SB>2</SB>, and causes light having a predetermined wavelength to resonate between the two mirror-function layer portions ML<SB>1</SB>and ML2. Further, a dispersion value with respect to the light L having the predetermined wavelength is in the range of -600 fs<SP>2</SP>to -3000 fs<SP>2</SP>and a reflectance is in the range of 97 to 99.5%. COPYRIGHT: (C)2009,JPO&INPIT
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