The feasibility of a stationary maser effect due to thermal and UHF excitation of paramagnetic crystals
Abstract
Consideration is given to a novel type of maser scheme based on thermal and UHF excitation of paramagnetic yttrium ethyl sulfate (YES) crystal. The crystal is doped with 143-Nd(3+), 172-Yb(3+), and 168-Er(3+) ions of types A, B, and C, respectively. In contrast to classical three-level schemes, quantum amplification in the YES crystal is achieved by partial population inversion of hyperfine sublevels in the A-type working ions. The effective electron spin of the A-type working ions is S(A) = 1/2 and the nuclear spin I is not equal to zero. The crystal matrix, the ion type, and the direction of the external magnetic field are chosen to ensure an optimum thermal contact between the nuclear spins I and the electron spins S(B) = 1/2 of the B-type ions. Inversion is achieved by means of dynamic polarization of teh S(B) spins using UHF pumping; and a frequency shift of the Zeeman sublevels of C-type ions having an electron spin S(C) = 1/2 is obtained. The mechanism for creating the population inversion in the maser scheme is found to be similar to the operating principle of a partial inversion gasdynamic laser.
- Publication:
-
Zhurnal Eksperimentalnoi i Teoreticheskoi Fiziki
- Pub Date:
- October 1985
- Bibcode:
- 1985ZhETF..89.1280V
- Keywords:
-
- Crystal Lattices;
- Doped Crystals;
- Electron Paramagnetic Resonance;
- Masers;
- Quantum Electronics;
- Crystallography;
- Ethyl Compounds;
- Metal Ions;
- Polarization Characteristics;
- Positive Ions;
- Sulfates;
- Yttrium Compounds;
- Lasers and Masers