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Tm:CaGdAlO4: spectroscopy, microchip laser and passive Q-switching by carbon nanostructures
- Source :
- SPIE Proceedings.
- Publication Year :
- 2017
- Publisher :
- SPIE, 2017.
-
Abstract
- Absorption, stimulated-emission and gain cross-sections are determined for 3 at.% Tm:CaGdAlO4. This crystal is employed in a microchip laser diode-pumped at 802 nm. In the continuous-wave (CW) regime, this laser generates 1.16 W at 1883-1893 nm with a slope efficiency of 32% with respect to the absorbed pump power. Using a special "bandpass" output coupler, vibronic CW laser operation up to 2043 nm is achieved. For passive Q-switching of the Tm:CaGdAlO4 laser-saturable absorbers (SAs) based on CVD-grown graphene and randomly-oriented arc-discharge single-walled carbon nanotubes (SWCNTs) in a PMMA film. The SWCNT-SA demonstrates superior performance. The laser produced a maximum average output power of 245 mW at 1844 nm with a slope efficiency of 8%. The latter corresponds to a pulse energy and duration of 6 μJ and 138 ns, respectively, at a repetition rate of 41 kHz. Using the graphene-SA, 2.8 μJ, 490 ns pulses are obtained at a repetition rate of 86 kHz.
- Subjects :
- Materials science
business.industry
Graphene
Slope efficiency
02 engineering and technology
Output coupler
Carbon nanotube
021001 nanoscience & nanotechnology
Laser
01 natural sciences
Q-switching
law.invention
010309 optics
law
0103 physical sciences
Optoelectronics
0210 nano-technology
business
Absorption (electromagnetic radiation)
Diode
Subjects
Details
- ISSN :
- 0277786X and 18831893
- Database :
- OpenAIRE
- Journal :
- SPIE Proceedings
- Accession number :
- edsair.doi...........50313d41fd9a81cec933f0cc0ca12c88