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Hafnium Diboride as a saturable absorber for Q-switched lasers.
- Source :
- Journal of Modern Optics; Mar2019, Vol. 66 Issue 6, p689-696, 8p
- Publication Year :
- 2019
-
Abstract
- Hafnium diboride (HfB<subscript>2</subscript>) is used in hypervelocity re-entry vehicles (such as intercontinental ballistic missile (ICBM) or ICBM heat shields), nuclear reactors and aerodynamic leading edges because of its strong tensile strength and high thermal resistance. HfB<subscript>2</subscript> is an ultra-high-temperature ceramic (UHTC) with a melting point of 3250°C. In this paper, we study the performance of HfB<subscript>2</subscript> as a saturable absorber in Q-switched lasers. HfB<subscript>2</subscript> has a non-saturable absorptance of 2.5 dB/µm, a saturable absorptance of 0.8 dB/µm and a saturation fluence of 12 µJ/cm<superscript>2</superscript>. In addition, the saturation lifetime is estimated as 989.3 ps, while the recovery lifetimes are estimated as 254.9 and 22.1 ps. As a saturable absorber in our Q-switched laser, we observed pulses with durations between 880 and 2000 ns. With the addition of an acousto-optic modulator, we have observed Q-switching mode-locking, with pulses as low as 250 ns. HfB<subscript>2</subscript> can potentially work at very high power, since its damage fluence is no less than 361 mJ/cm<superscript>2</superscript>. [ABSTRACT FROM AUTHOR]
- Subjects :
- HAFNIUM oxide
THERMAL resistance
NUCLEAR reactors
AERODYNAMIC load
LASERS
Subjects
Details
- Language :
- English
- ISSN :
- 09500340
- Volume :
- 66
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Journal of Modern Optics
- Publication Type :
- Academic Journal
- Accession number :
- 134919398
- Full Text :
- https://doi.org/10.1080/09500340.2019.1566508