Related Experiment Video
Updated: Jun 20, 2026
07:55
High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
Published on: September 22, 2017
Solid-state vibrational laser-KBr:CN(-)
Optics Letters
|September 2, 2009
Summary
Researchers achieved laser oscillation using cyanide (CN-) molecules in potassium bromide (KBr) crystals. This was enabled by optical pumping and efficient energy exchange, creating a population inversion for laser emission.
Area of Science:
- Solid-state physics
- Molecular spectroscopy
- Laser physics
Background:
- Vibrational spectroscopy of molecular ions in solid hosts is crucial for understanding energy transfer mechanisms.
- Potassium bromide (KBr) is a well-established host crystal for doping with molecular impurities.
- Cyanide (CN-) molecular ions exhibit distinct vibrational transitions suitable for spectroscopic studies.
Purpose of the Study:
- To investigate laser oscillation from vibrational transitions of cyanide (CN-) molecules doped into potassium bromide (KBr) host crystals.
- To explore the conditions necessary for achieving population inversion in the CN- vibrational system.
- To understand the role of optical pumping and energy exchange in facilitating laser emission.
Main Methods:
- Doping of KBr host crystals with CN- molecules.
- Optical pumping of the 0 → 1 vibrational transition of CN-.
- Spectroscopic analysis to observe laser oscillation at 2054 cm(-1).
- Investigation of vibrational-energy exchange processes at varying CN- concentrations.
Main Results:
- Laser oscillation was successfully observed at a frequency of 2054 cm(-1).
- Population inversion between the nu = 2 and nu = 1 vibrational levels of CN- was achieved.
- Efficient vibrational-energy exchange was identified as a key process.
Conclusions:
- Vibrational transitions of CN- in KBr crystals can support laser oscillation.
- Optical pumping combined with efficient energy exchange is a viable method for creating population inversion.
- This study demonstrates the potential of doped molecular crystals for developing new laser sources.
Related Concept Videos
01:13Atomic Absorption Spectroscopy: Radiation and Light Sources
Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
01:22Atomic Emission Spectroscopy: Instrumentation
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
01:29Atomic Emission Spectroscopy: Lab
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
03:26Electron Configuration of Multielectron Atoms
The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
01:23Atomic Spectroscopy: Absorption, Emission, and Fluorescence
Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...