Patent ID: 8436329

Claim:
The method of analyzing a fluid sample, comprising: converting the fluid sample to gaseous state, thereby providing a gaseous sample; providing a LASER having a body formed of active material capable of lasing, with first and second opposite ends, said first end forming a first reflective surface, and said second end having an anti-reflection coating and spaced therefrom an external reflective surface (ERS) so as to form an extended cavity therebetween; said ERS positioned to reflect back into the extended cavity, thereby allowing formation of a standing wave between the reflective surfaces, forming a vacuum in the extended cavity; initiating the LASER, and establishing an initial operating frequency while the vacuum is present in the extended cavity; inserting the gaseous sample into the extended cavity; re-initiating the LASER, and establishing a secondary operating frequency while the gaseous sample is present in the extended cavity; analyzing the results, thus determining the fluid sample's components and concentrations.