Au-Film Coated Si Concave Mirror for CO₂ Laser Applications.
Si concave mirror with Au-film coating (Ø25 mm, R2600) is designed for high-power infrared laser applications, R≥99% @10.6 μm &R>90%@650nm(45° incidence) with excellent surface quality and durability.
@USAmbChina Beyond the visa fee, we have incurred significant costs in travel, time, and confirmed exhibition arrangements. We respectfully request clarification on the process and whether feedback mechanisms exist for legitimate business applicants.
@USAmbChina Dear Ambassador:
we politely asked for the reason for refusal, but were told “no explanation can be provided.” we understand visa decisions are discretionary, a complete lack of explanation after full preparation and payment raises concerns about transparency and procedural
@USAmbChina Dear Ambassador:
Our company has been refused a U.S. B1 business visa twice at the U.S. Embassy in Beijing, despite having complete documentation: a paid U.S. exhibition booth contract, formal invitation, and ongoing cooperation with U.S. partners.