Peculiarities of second harmonic generation of radiation from a pulsed ytterbium-doped fibre laser in KTiOPO{sub 4} crystals

Journal Article · Tue Jul 31 00:00:00 EDT 2007 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2007V037N07ABEH013305· OSTI ID:21470878

Davydov, B L; Krylov, Aleksandr A ^[1]

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1. IRE-Polyus Research and Technology Association, Fryazino, Moscow Region (Russian Federation)

Second harmonic generation of radiation from a high-power fibre Yb{sup 3+} laser is studied upon sf-f phase matching near the X axis of the KTP crystal (KTiOPO{sub 4}). The temperature dependence of the phase-matching wavelength as well as its spectral, angular and temperature tuning characteristics of the second harmonic generator are experimentally measured. It is found that the increase in the average output power of the second harmonic in a single crystal is limited, first of all, by the thermal self-focusing of radiation caused by the absorption of radiation from the second harmonic, whose threshold decreases with increasing the crystal temperature. When the two-channel scheme is used, the maximum stable {approx}4-W output power of the second harmonic is obtained in two tandem KTP crystals. (nonlinear optical phenomena)

• OSTI ID: 21470878
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Vol. 37, Issue 7; Other Information: DOI: 10.1070/QE2007v037n07ABEH013305; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION
CRYSTALS
DOPED MATERIALS
FOCUSING
HARMONIC GENERATION
LASERS
MONOCRYSTALS
OPTICAL FIBERS
TEMPERATURE DEPENDENCE
TUNING
WAVELENGTHS
YTTERBIUM
YTTERBIUM IONS
CHARGED PARTICLES
ELEMENTS
FIBERS
FREQUENCY MIXING
IONS
MATERIALS
METALS
RARE EARTHS
SORPTION