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Applied Optics

Applied Optics


  • Vol. 7, Iss. 5 — May. 1, 1968
  • pp: 905–914

Spectroscopic and Laser Characteristics of Neodymium-doped Calcium Fluorophosphate

R. C. Ohlmann, K. B. Steinbruegge, and R. Mazelsky  »View Author Affiliations

Applied Optics, Vol. 7, Issue 5, pp. 905-914 (1968)

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Laser oscillations have been produced in large crystals of Nd3+-doped Ca5(PO4)3F (the mineral fluorapatite, whence the coined name FAP) at room temperature under both tungsten lamp and flash lamp excitation. The laser tests show that FAP:Nd crystals have four times greater gain per incident pump energy and over one and a half times greater differential (slope) energy efficiency than equal size YAG:Nd crystals. The fluorescence, excitation, and absorption spectra of FAP:Nd are partially polarized, as expected for Nd3+ substituting Ca ii sites of C1h symmetry. The fluorescence lifetime is 0.24 msec at 300°K. Laser oscillations occur at 1.0629 μ in π polarization (Ec), which has 2.6 times the gain of σ polarization (Ec).

© 1968 Optical Society of America

Original Manuscript: January 8, 1968
Published: May 1, 1968

R. C. Ohlmann, K. B. Steinbruegge, and R. Mazelsky, "Spectroscopic and Laser Characteristics of Neodymium-doped Calcium Fluorophosphate," Appl. Opt. 7, 905-914 (1968)

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