A method of detecting an explosive material, and an analyzer and computer program products that may perform such methods. A method may include illuminating at least a portion of the material with light, and monitoring the temperature of the illuminated portion. T power or location of the illuminating light may be altered in response to the monitored temperature. Raman spectral data are produced in response to Raman radiation emitted from the portion in response to the light. The composition of the material may be analyzed based on the Raman spectral data or generating an indication to an operator that the material cannot be safely analyzed.