NO 2 degenerate four wave mixing

Peter Bengtsson

Antonio Mecozzi, P. Spanò, Alessandro D’Ottavi +1 more

Degenerate Four Wave Mixing (DFWM) and Nearly Degenerate Four Wave Mixing (NDFWM) have attracted a considerable attention in non-linear optics. DFWM has found several applications in phase conjugation, used in real time holography and adaptive optics. To realize a higher amplification of the conjugate wave, semiconductor amplifiers have been used. A theoretical analysis of the NDFWM process has been presented by Agrawal [1]. Here, an experimental and theoretical analysis of NDFWM in Distributed Feedback (DFB) lasers is proposed, where the FWM efficiency is enhanced by the cavity feedback mechanism.

V. D. Solovev, A I Khizhnyak

Ian C. McMichael

This dissertation presents experimental and theoretical studies of transient degenerate four wave mixing (DFWM) in organic dyes. Chapter 1 is an introduction to DFWM. Chapter 2 describes DFWM experiments that were performed in the gain medium of a dye laser. Chapter 3 presents the theory of DFWM of short pulses in three level saturable media. Chapter 4 presents DFWM experiments of femtosecond pulses in the saturable absorber of a passively modelocked ring dye laser. Chapter 5 presents the theory of DFWM of ultrashort pulses in resonant media.

Paul Michael Petersen

Wenqi Wei, Z.Z. Lu, Q. Dong +6 more

We report an experimental investigation of degenerate four-wave mixing spectrum of SO2.A novel beam-split technique is used to compensate the beam drift caused by the laser itself and disturbance from the environment.Degenerate four-wave mixing spectra of the transition B 1 B1 ← X 1 A11 for SO2 are obtained.The degenerate four-wave mixing signal intensity as a function of the total input laser energy is measured.The effects of the laser field intensity on the degenerate four-wave mixing spectrum are analyzed.Our results show that the degenerate four-wave mixing signal intensity rises with laser intensity and tends to saturate.Then, a dip begins to appear at resonance in the profile with increase in laser field.The existence of saturation for degenerate four-wave mixing signal intensity and spectrum profile confirms the prediction of previous theoretical work.