Apr. 1997

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Article Navigation > High Power Laser and Particle Beams > 1997 > 09(04): 0-

Abstract

Ｕｓｉｎｇ　ＣＣＤ　ｃａｍｅｒａ，ｂａｓｅｄ　ｏｎ　ｔｈｅｃａｌｉｂｒａｔｉｏｎ　ｔｏ　ｐｕｔ　ｔｈｅ　ＣＣＤ　ｅｘａｃｔｌｙ　ｏｎ　ｔｈｅｒｅａｒ　ｆｏｃａｌ　ｐｌａｎｅ　ｏｆ　ａ　ｌｅｎｓ　ｗｉｔｈ　ｌｏｎｇ　ｆｏｃａｌｌｅｎｇｔｈ，ｗｅ　ｃａｎ　ｇｅｔ　ｔｈｅ　ｐｉｘｅｌ　ｎｕｍｂｅｒ　ｏｆ　ｔｈｅＣＣＤ　ｃｏｒｒｅｓｐｏｎｄｉｎｇ　ｔｏ　ｔｈｅ　ｐｅｒ　ｍｒａｄ　ｏｆ　ｔｈｅｆａｒ　ｆｉｅｌｄ　ｄｉｖｅｒｇｅｎｃｅ．Ｔｈｅｒｅｆｏｒｅ,ｔｈｅ　ｆａｒ　ｆｉｅｌｄｄｉｖｅｒｇｅｎｃｅ　ｃｏｕｌｄ　ｂｅ　ｄｅｔｅｃｔｅｄ　ｑｕｉｃｋｌｙ．Ｍｅａｎｗｈｉｌｅ,ｔｈｅ　ｓｐａｔｉａｌ　ｉｎｔｅｎｓｉｔｙ　ｄｉｓｔｒｉｂｕｔｉｏｎｉｎ　ｎｅａｒ　ｆｉｅｌｄ　ｉｓ　ｍｅａｓｕｒｅｄ　ｕｓｉｎｇ　ＣＣＤ．ＴｈｅＦｏｕｒｉｅｒｔｒａｎｓｆｏｒｍ　ｏｆ　ｔｈｅ　ｌａｓｅｒｂｅａｍ　ａｍｐｌｉｆｉｅ
- far field divergence,
- measurement using ccd