skip to main content

SciTech ConnectSciTech Connect

Title: Random lasing of microporous surface of Cr{sup 2+}:ZnSe crystal induced by femtosecond laser

We demonstrate a random lasing emission based on microporous surface of Cr{sup 2+}:ZnSe crystal prepared by femtosecond pulsed laser ablation in high vacuum (below 5 × 10{sup −4} Pa). The scanning electron microscope results show that there are a mass of micropores with an average size of ∼13 μm and smaller ones with ∼1.2 μm on the surface of Cr{sup 2+}:ZnSe crystal. The adjacent micropore spacing of the smaller micropores ranges from 1 μm to 5 μm. Under 1750 nm excitation of Nd:YAG (355 nm) pumped optical parametric oscillator, a random lasing emission with center wavelength of 2350 nm and laser-like threshold of 0.3 mJ/pulse is observed. The emission lifetime of 2350 nm laser reduces from 800 ns to 30 ns as the pump energy increases above threshold. The emission spectra and decay time of smooth surface, groove and microporous surface of Cr{sup 2+}:ZnSe crystal are contrasted. The optional pump wavelength range is from 1500 nm to 1950 nm, which in accordance with the optical absorption property of Cr{sup 2+}:ZnSe crystal. The peak position of excitation spectra is almost identical to the strongest absorption wavelength.
Authors:
; ; ; ;  [1] ;  [1] ;  [2]
  1. College of Electronics and Information Engineering, Sichuan University, Chengdu 610065 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22493919
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 6; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABLATION; ABSORPTION SPECTRA; CHROMIUM IONS; CRYSTALS; EMISSION SPECTRA; EXCITATION; LASER RADIATION; LIFETIME; NEODYMIUM LASERS; PARAMETRIC OSCILLATORS; POROUS MATERIALS; PULSED IRRADIATION; SCANNING ELECTRON MICROSCOPY; SURFACES; ZINC SELENIDES