TY  - RPRT
TI  - Direct quasi-phase-matched fourth-harmonic generation.
AU  - Xianfeng Chen
AU  - Yuping Chen
AU  - Yuxing Xia
PY  - 2005
DO  - 10.1364/ao.44.001028
UR  - https://pubmed.ncbi.nlm.nih.gov/15751694/
ID  - 15751694
ER  -