SEDL / STP / STP1038-EB / STP24449S

Damage Threshold of Oscillator Mirrors in Mark III FEL

Deacon, DAG
Deacon Research, Palo Alto, CA

Benson, SV
Deacon Research, Palo Alto, CA

Madey, JMJ
Deacon Research, Palo Alto, CA

Schultz, J
Deacon Research, Palo Alto, CA

Pages: 4    Published: Jan 1988

Download this paper for $25 PDF (48K)          View License Agreement
Abstract

We have observed damage of gold resonator mirrors in the Mark III FEL with 1.2 microsecond macropulses at a fluence threshold of 21 J/cm². This number agrees with YAG laser damage measurements scaled by the square root of the ratio of the pulse lengths. Silver coated mirrors have not shown damage up to an equivalent threshold of 40 J/cm². Work aimed at increasing the pulse energy on the silver mirrors is continuing; we expect to extend these measurements in the near future.