measurement of ultra-high intensity average pulse power storage threshold

2014 Fiscal Year Final Research Report

• Project/Area Number: 24654076
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: High Energy Accelerator Research Organization
• Principal Investigator: URAKAWA Junji 大学共同利用機関法人高エネルギー加速器研究機構, その他部局等, 名誉教授 (00160333)
• Co-Investigator(Renkei-kenkyūsha): HONDA Yosuke 高エネルギー加速器研究機構, 助教 (40509783) ; SAKAUE Kazuyuki 早稲田大学, 助教 (80546333)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 量子ビーム / レーザー密度 / レーザー共振器

Outline of Final Research Achievements

Laser pulse with 10ps width was injected into the optical cavity which was installed in vacuum chamber and new applification method, so called burst applification, is realized with applification factor 10000 and 100us pulse duration by inverse circulation feedback method. From this experiment, we confirmed about 1.0mJ of pulse energy had no effect to high reflect mirrors and the storage of laser power 357kW with 100us duration was safe for optical cavity operation. The peak power on the mirrors was about 10GW/cm2. Also, we succeeded to storage 30kW in other optical cavity, which means average power of 1MW/cm2 is no problem on mirror damage. However, we found a little variation on mirror by measuring transmitted laser profile.

Free Research Field

加速器科学