A method for clutter filtering staggered pulse repetition time data signals is provided. The inner portion may include top, bottom, and first and second side portions that define a first aperture configured to receive the vial, and a top flap securable to the top or first or second side portions so as to retain the vial within the first aperture. The laser can provide a substantially continuous amount of energy to the ionized gas to generate a substantially continuous high brightness light.