Optical instrument

Abstract

Abstract PURPOSE: To optimize a normal output beam parameter by positioning a light source and a lens, to meet a specific condition. CONSTITUTION: A light beam emitted from an optical fiber is made to enter a lens 52 as an inputted beam. At this time, the inputted beam is cut off at a beam cutting off radius rL by the lens 52, and the main flat face of the front side of the lens is separated from the minimum necking 111 of the inputted beam by a distance S. A factor R obtained by dividing the beam cutting off radius rL by a minimum necking radius rW is provided with a value subordinate to the radius of an optical fiber core or the radius of the minimum necking of the inputted beam. The factor R ranges from 1.5 to a value X which does not exceed a quotient obtained by dividing 4.0 by twice the minimum necking radius rW (unit mm) of the inputted beam. The focal distance F of a lens is selected to make a ratio with respect to the distance S of the focal distance F to be 0.25 to 0.95, according to the distance S between the minimum necking 111 of the inputted beam and the main flat surface 110 of the front face of the lens. Thereby, the parameter is obtained.

Inventors

• 👤 Wendell V Ebling
• 👤 ウエンデル・ブイ・イブリング
• 👤 John F Forkner
• 👤 ジヨン・エフ・フオークナー
• 👤 Robert J Freiberg
• 👤 ロバート・ジエイ・フレイバーグ
• 👤 Robert E Woodard
• 👤 ロバート・イー・ウツダード

Bibliographic Details