TY - JOUR AU - C Bucher AU - K Lehmann AU - David Plusquellic AU - Gerald Fraser C2 - Applied Optics DA - 2000-01-01 LA - en M1 - 39 PB - Applied Optics PY - 2000 TI - Doppler-Free Nonlinear Absorption in C2H4 Using CW Cavity Ring-down Spectroscopy ER -