KR950034940A - 높은 반복 속도의 미드 적외선 레이저 - Google Patents

높은 반복 속도의 미드 적외선 레이저 Download PDF

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KR950034940A
KR950034940A KR1019950011234A KR19950011234A KR950034940A KR 950034940 A KR950034940 A KR 950034940A KR 1019950011234 A KR1019950011234 A KR 1019950011234A KR 19950011234 A KR19950011234 A KR 19950011234A KR 950034940 A KR950034940 A KR 950034940A
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laser
pump
pulse
laser medium
optical
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제이. 프레이버그 로버트
코제안 콜레테
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코제안 콜레테
프리미어 레이저 시스템즈, 인크.
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Abstract

높은 펄스 반복 속도를 갖고 있는 광학적으로 펌프된 미드 적외선 솔리드-스테이트 레이저는 레이저 수술에 사용하기 위해 설명되어 있다. 레이저는 1.7과 4.0㎛ 사이의 파장을 형성하여 광학적으로 펌프된다. 펌프 펄스의 상승 및 하강 시간은 충분히 짧기 때문에, 불안정성으로 유도된 열적 렌싱을 피할 수 있다. 레이저는 펄스 에너지의 증가에 필요없는 조직 절단이 증가된 비율을 제공한다.

Description

높은 반복 속도의 미드 적외선 레이저
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 본 발명에서 개시된 형태를 대표하는 광학적으로 펌프된 솔리드-스테이트 레이저(solid-state laser)의 개략적인 단면도, 제2도는 펌프 광원 구동 회로의 기능적인 블럭도, 제3도는 본 실시예에 적합한 펄스-형성 네트워크의 기본 개략도.

Claims (18)

  1. 펌프 광원; 상기 펌프광에 의한 펌핑을 위해 배치되고 상기 펌프광에 의한 펌핑에 응답하여 1.7㎛와 4㎛ 사이의 파장을 갖고 있는 광을 방출하는 레이저 매체를 포함하는 공진 캐비티; 및 초당 10펄스 이상의 높은 펄스 반복 속도로 펄스된 광학 펌프 에너지를 발생하도록 상기 펌프 광원에 에너지를 가하는 회로를 포함함으로써, 상기 공진 캐비티가 상기 반복 속도로 레이저 펄스를 발생하고, 상승 및 하강 시간을 갖고 있는 펌프 펄스의 세기가 상기 펄스 반복 속도로 상기 공진 캐비티에서의 상기 레이저 펄스의 열적 렌싱로 인한 불안정성을 부분적으로 제거하도록 충분히 짧은 것을 특징으로 하는 펄스식 광학 펌프 레이저.
  2. 제1항에 있어서, 상기 펄스 반복 속도는 적어도 초당 20펄스인 것을 특징으로 하는 펄스식 광학 펌프 레이저.
  3. 제1항에 있어서, 상기 레이저 펄스의 에너지는 1J 이하인 것을 특징으로 하는 펌프식 광학 펌프 레이저.
  4. 제1항에 있어서, 상기 레이저 펄스의 펄스 지속 기간은 500㎛ 이하인 것을 특징으로 하는 펌프식 광학 펌프 레이저.
  5. 제1항에 있어서, 상기 회로는 상기 레이저 매체를 실질적으로 상기 레이저 매체의 레이저 임계치 이하로 유지할 수 있는 충분한 레벨로 펌프 에너지를 상기 레이저 매체에 공급하기 위해 펄스간 주기 동안 상기 펌프 광원에 에너지를 가하는 것을 특징으로 하는 펄스식 광학 펌프 레이저.
  6. 제4항에 있어서, 상기 펌프 광원 및 상기 레이저 매체는 상기 펌프 광원 및 상기 레이저 매체 각각의 축이 타원형의 다른 촛점과 실질적으로 동일 선상에 놓이도록 타원형의 단면을 가진 반사성 원통성 캐비티내에 설치되는 것을 특징으로 하는 펄스식 광학 펌프 레이저.
  7. 제5항에 있어서, 상기 펌프 광원에 의해 방출된 모든 방사선을 실질적으로 차단하고, 상기 레이저 매체의 펌프 파장에 대응하는 광 파장으로 최대 상대적 스펙트럴 투과율을 갖도록 배치되는 광 필터를 구비하는 것을 특징으로 하는 펄스식 광학 펌프 레이저.
  8. 제1항에 있어서, 상기 공진 캐비티는 상기 레이저 매체의 열적 렌싱 효과를 적어도 부분적으로 보상하도록 구성된 반사기를 포함하는 것을 특징으로 하는 펄스식 광학 펌프 레이저.
  9. 제1항에 있어서, 상기 레이저 매체를 냉각하기 위한 유체 쿨런트를 포함하고, 상기 유체 쿨런트는 유체와 상기 레이저 매체의 상기 표면 사이의 경계부를 제외하고, 상기 레이저 매체의 표면에 평행한 방향으로 실질적으로 층류(laminar flow)를 유지하도록 구성된 흐름 경로를 갖고 있는 것을 특징으로 하는 펄스식 광학 펌프 레이저.
  10. 펌프 광원; 레이저 매체 및 반사기를 포함하는 광학 공진기 캐비티를 포함하는데, 상기 레이저 매체는 상기 펌프광에 의한 펌핑에 응답하여 1.7㎛와 4㎛ 사이의 광을 방출하고, 상기 반사기 중 하나는 레이저 광출력을 발생하도록 부분적으로 투과되며, 상기 반사기 중 적어도 하나는 곡선형 미러를 포함하고, 상기 미러의 곡률은 상기 레이저 매체의 열적 랜싱 효과를 적어도 부분적으로 보상하기 위해 선택되고, 상기 레이저 매체를 냉각하고, 유체와 상기 레이저 매체의 상기 표면 사이의 경계부를 제외하고 상기 레이저 매체의 표면과 평행한 방향으로 상기 레이저 매체를 포함하는 상기 광학 공진기 캐비티의 일부를 통해 실질적으로 층류를 제공하도록 구성된 유체 시스템; 및 상기 펌프원에 에너지를 가하며, 총 에너지에 대한 피크력(peak power)의 비가 500㎲이하인 전기 펄스를 발생하는 전기 회로를 구비하는데, 상기 전기 회로는 펄스간 에너지를 상기 펄스들 사이의 상기 펌프원에 공급하고, 상기 펄스간 에너지는 상기 레이저 매체를 실질적으로 상기 레이저 매체의 레이저 임계값 이하로 유지하도록 충분한 펌프 에너지를 상기 레이저 매체에 공급하도록 상기 펌프원에 에너지를 가하는 것을 특징으로 하는 펄스식 레이저.
  11. 제9항에 있어서, 상기 레니저 광 출력은 1J 이하의 펄스 에너지를 갖고 있는 펄스로 이루어지는 것을 특징으로 하는 펄스식 레이저.
  12. 제9항에 있어서, 펄스 반복 속도는 초당 10펄스 이상인 것을 특징으로 하는 펄스식 레이저.
  13. 제9항에 있어서, 반사성 타원형 원통으로 구성되는 광학 펌프 캐비티를 구비하며, 상기 타원형 원통내에는 이 원통의 서로 다른 촛점 라인에 일직선으로 정렬되는 상기 펌프 광원 및 상기 레이저 매체가 설치되어 있는 것을 특징으로 하는 펄스식 레이저.
  14. 제12항에 있어서, 상기 펌프광원에 의해 방출된 모든 펌프 광을 실질적으로 차단하고, 상기 레이저 매체의 펌프 파장이외의 파장으로 펌프광을 양호하게 흡수되도록 배치하는 광학 필터를 구비하는 것을 특징으로 하는 펄스식 레이저.
  15. 1J 이하인 펄스 에너지와 초당 10펄스 이상의 반복 속도로 1.7 에서 4㎛사이의 파장의 광 펄스를 공급하는 단계; 및 조직을 변형하기 위해 조직에 상기 펄스를 지향하는 단계를 포함하는 것을 특징으로 하는 수술 방법.
  16. 제15항에 있어서, 상기 펄스는 500㎲ 이하의 지속 기간을 갖고 있는 것을 특징으로 하는 수술 방법.
  17. 제15항에 있어서, 광섬유를 통해 펄스를 전달하는 단계를 포함하는 것을 특징으로 하는 수술 방법.
  18. 제15항에 있어서, 상기 조직에 대한 방사선 노출이 2.0J/㎟/펄스 이하인 것을 특징으로 하는 수술 방법.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019950011234A 1988-09-28 1995-05-09 높은 반복 속도의 미드 적외선 레이저 KR950034940A (ko)

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US08/240,225 US5571870A (en) 1988-09-28 1994-05-10 Liquid phase fluorination
US8/240225 1994-05-10

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