Controlling of two-photon transition rate towards two-photon laser oscillation

2014 Fiscal Year Final Research Report

• Project/Area Number: 24654132
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Atomic/Molecular/Quantum electronics
• Research Institution: Okayama University
• Principal Investigator: UETAKE Satoshi 岡山大学, 自然科学研究科, 准教授 (80514778)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 二光子放出 / マクロコヒーレント

Outline of Final Research Achievements

In this research project, we investigate a way to enhance the two-photon emission rate by using atomic/molecular coherence. Two-photon lasing is difficult because the two-photon emission rate is very small in general. Thus a high two-photon emission rate is required in order to realize the "two-photon laser". In this research, we succeeded to observe the two-photon emission from vibrationally excited state of para hydrogen gas, whose density of 10 to the 20th per cubic centimeters. The spontaneous two-photon emission from vibrationally excited state of para-hydrogen is almost impossible because the emission rate is very small. Thus the observation of two-photon emission means that we succeeded to obtain a high rate enhancement. The enhancement factor is estimated to be 10 to the 18th. These results play an important role for future realization of a two-photon laser.

Free Research Field

量子エレクトロニクス