略語大辞典 [Opt] 29 LTHR lateral transfer hollow retroreflector 平行移動反射鏡.lateral transfer hollow retroreflector; anoptical retroreflector; a monolithic structure involving a precisely aligned hollow roof mirror and a plane mirror; returns the exiting beam parallel to, butlaterally separated from, the incoming beam; 丸善「略語大辞典」JLogosID : 11881218