Squeezed-State-Enhanced Frequency-Modulation Spectroscopy

We analyze simple model which demonstrates the feasibility of using optical squeezed states to enhance the detection sensitivity limits of frequency modulation laser absorption spectroscopy. The model shows that the most significant noise reduction would result by squeezing the weak frequency modulated sidebands rather than the strong carrier and that losses in the optical detector could be made to set the limiting noise floor. Using presently available detectors, an order of magnitude improvement in the quantum limited sensitivity of frequency modulation spectroscopy may be possible.