NEW-TYPE PHOTOCATHODE FOR POLARIZED ELECTRON SOURCE WITH DISTRIBUTED-BRAGG-REFLECTOR

Authors
SAKA T KATO T NAKANISHI T TSUBATA M KISHINO K HORINAKA H KAMIYA Y OKUMI S TAKAHASHI C TANIMOTO Y TAWADA M TOGAWA K AOYAGI H NAKAMURA S
Citation
T. Saka et al., NEW-TYPE PHOTOCATHODE FOR POLARIZED ELECTRON SOURCE WITH DISTRIBUTED-BRAGG-REFLECTOR, JPN J A P 2, 32(12B), 1993, pp. 120001837-120001840
Citations number
17
Categorie Soggetti
Physics, Applied
Journal title
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS → ACNP
Volume
32
Issue
12B
Year of publication
1993
Pages
120001837 - 120001840
Database
ISI
SICI code
Abstract
In order to increase the quantum efficiency of the strained GaAs photo cathode for a highly polarized electron source, we designed a new type of photocathode with a distributed Bragg reflector (DBR). A Fabry-Per ot cavity is formed by the DBR and the GaAs surface. A large enhanceme nt of quantum efficiency was observed at the laser wavelength which sa tisfied the condition for the resonant absorption of incident laser li ght. Based on this experiment, it appears promising to make a photocat hode which has the quantum efficiency of more than approximately 1% to gether with electron spin polarization higher than 80%.