Abstract

The photon number-dependent phase shift (quantum phase diffusion) in a χ⁽³⁾ medium produces a number-phase squeezed state.¹ A fiber soliton is one candidate to produce a squeezed state by this principle.² However, because of the extremely small χ⁽³⁾ coefficient of fiber materials, efficient generation of a squeezed state requires a pump soliton with a very high peak intensity. It is known that a colliding pulse mode-locked (CPM) dye laser generates a stable solitonlike pulse due to the Kerr nonlinearity of a dye solvent and the negative group velocity dispersion by four intracavity prisms.³ This laser has several advantages for producing a squeezed soliton, such as the low noise pump pulse formation due to the soliton effect and the high peak intensity due to femtosecond pulse duration and intracavity nonlinear interaction.

© 1990 Optical Society of America