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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:14 |
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Conference: Bucharest University Faculty of Physics 2003 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Design and characterization of an end-pumped Nd:YAG microlaser
Authors:
L. Neagu, R. Dabu, A. Stratan
Affiliation:
National Institute for Laser, Plasma and Radiation Physics
E-mail
Keywords:
Abstract:
The aim of this work is to design, optimise and characterize a new type of Nd:YAG microlaser, pumped by a laser diode working in quasi-continuum regime.
Using this type of laser diode the pumping intensity is larger and higher laser power is expected in the condition of lower thermal loss in the laser rod in charge of the comparison with the continuum wave pumped micro-lasers. The microlaser have some remarkable characteristics such as high peak-power (tens of kW), nanosecond pulsewidth, large adjustable repetition rate (up to hundreds of Hz), narrow spectral width, high quality optical beam, reduced consumption.
The resonator length of the longitudinally pumped microchip laser is as short as 3.5 mm. It is passively Q-switched by use of a saturable absorber crystal (Cr:YAG).
The pump diode laser is working at 810 nm wavelength and the microlaser output radiation wavelength is 1064 nm. The output mirror reflectivity was greater than 90% for the fundamental mode. The reflectivity of deposited mirror at the pumped end of the rod at the same wavelength was greater than 99.8% while transmission for the same mirror at laser diode wavelength was greater than 90%. The maximum efficiency of the laser system is greater then 30% and was obtained when the pumping beam is focused to a spot comparable with fundamental mode dimension.
The most output parameters of the new type of Nd:YAG microlaser are in good agreement with the theoretical estimations.
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