Spectroscopy and laser oscillation properties of lithium neodymium tetraphosphate
Optical absorption, fluorescence, and laser characteristics of lithium neodymium tetraphosphate (LiNdP$sub 4$$O$$sub 12$, abbreviated as LNP) were examined. The crystal belongs to the monoclinic system (pseudoorthorhombic system) and the Nd content is 4.37 x 10$sup 21$ cm$sup -3$. The lifetime of the $sup 4$F/sub 3/2/ level is 120 $mu$s, which is one-half of 230 $mu$s observed in Nd:YAG. The largest effective emission cross section at the line peak (1.047$sub 7$ $mu$m) was spectroscopically determined as 3.2 x 10$sup -19$ cm$sup 2$ for the electric vector parallel to the pseudoorthorhombic c axis and quantum efficiency was estimated as 0.48. Quasi-continuous laser oscillation pumped by a chopped Ar- ion laser was achieved with a 1.85-mm-long crystal. The output light was linearly polarized along the pseudoorthorhombic c axis of the crystal, which does not depend on the polarization direction of the pump light. The measured threshold and round-trip loss yield the value of 3.1 x 10$sup -19$ cm$sup 2$ for the effective emission cross section of LNP, which is in good agreement with the value obtained from the spectroscopic data. (auth)
- Research Organization:
- Nippon Telegraph and Telephone Public Corp., Tokyo
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-33-007245
- OSTI ID:
- 4152225
- Journal Information:
- IEEE J. Quant. Electron., v. QE-11, no. 7, pp. 330-335, Other Information: Orig. Receipt Date: 30-JUN-76
- Country of Publication:
- United States
- Language:
- English
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