Heat-dissipating structure for an optical isolator

A heat-dissipating structure for an optical isolator comprising:

• a magnetooptical crystalline film;
• first heat conductive members being formed on opposing sides of said magnetooptical crystalline film;
• second heat conductive members being placed adjacent to said first heart conductive members such that said first heat conductive members are located between said second heat conductive members and said magnetooptical crystalline film, said second heat conducting members having a hole for a light path;
• radiation fins formed at a part of said second heat conductive members;
• a magnet;
• and
• an isolator holder wherein said magnetooptical crystalline film, said first heat conductive members and said magnet are arranged within said isolator holder, said isolator holder being provided with guide openings for said radiation fins,
• wherein the heat-dissipating structure comprises an external heat conducting cover for said isolator holder,
• said guide openings in the isolator holder open toward said external heat conducting cover;
• said external heat conducting cover has an opening through which the radiation fins extend,
• said radiation fins are flexible;
• said radiation fins extend leaving a gap relative to said magnet and extend from said guide openings of the isolator holder without contacting the isolator holder to the outside of said external heat conducting cover through said opening in the external heat conducting cover and have their outer end portions in contact with the outside of said external heat conducting cover, and
• said isolator holder is in a holder accommodating space in said external heat conducting cover leaving space between the isolator holder and the external heat conducting cover.