| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2001: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2000: ¥2,100,000 (Direct Cost: ¥2,100,000)
|
|---|
| Research Abstract |
Two techniques have been developed for control of cascade-type amplified spontaneous emission pathways in the NO Rydberg states. The first method, referred to as switching, is based on destruction of the population inversion required for amplification. The second method, called seeding, utilizes the injection of external field. The weak ASE radiation generated in a seeder cell travels collinearly with pump beams, acting as seeder light for the inverted medium in a main cell. By extracting desired seeder wavelengths with optical filtering, amplification of the selected electronic transition is realized. In addition, selective enhancement between the rotational transitions belonging to the same inter-Rydberg system is achieved by taking advantage of their different polarization properties. Finally, we demonstrated that the combined use of switching and seeding provided with rotational selectivity.
The effect of externally injected radiation on the two-photon laser induced amplified spontaneous emission (LI-ASE) has been investigated. The wave generated via the same LI-ASE process in a seeder cell acts as a seeder field for the inverted medium created in a main cell. A nearly tenfold gain is achieved in the B1Z+→A1II(0, 3) transition of the CO molecule. We demonstrate that the single rotational transition in the B1Z+→A1II(0, 4) band is selectively amplified by injection of laser radiation. This pump and seed arrangement facilitates detection of molecular spectra by simply tuning the seed laser frequency.
|
