| 摘要 |
PROBLEM TO BE SOLVED: To provide a hologram laser unit which can be mounted collectively without causing any deterioration of the characteristics or performance. SOLUTION: A hologram element 3 is bonded through an adhesive 5 to a package 1 and a cut 8 is made in the package 1 as a part for communicating between the inside 1a and the outside of the package 1. Consequently, even if the component of the adhesive 5 is partially evaporated on the inside 1a of the package 1, it is discharged through the notch 8 to the outside and the inside of the package 1 is not filled with the eyaporated component. Since the gas pressure does not increase on the inside 1a of the package 1, the hologram element 3 is not shifted by the vapor pressure even if the bonding strength of the adhesive 5 is deteriorated. |
