Fly second optical parameter amplifying method using picosecond puls pumping

Abstract

The invention relates to optical parametric amplification method used picosecond pumping impulse for non chirp femtosecond signal impulse. Because of crystal chromatic dispersion, the signal light and pumping light has different group velocity in OPA crystal which makes the narrow femtosecond signal light impulse relatively slip in the long picosecond pumping light impulse duration. The invention uses impulse slip caused by the group velocity mismatch to make whole pumping impulse do contribute to femtosecond impulse amplification. Thus it only uses the first order OPA amplifier to supply enough gain. The method has simple structure, high amplification ratio, and enough gain spectrums to support 10fs impulse amplification.

Description

technical field [0001] The invention belongs to the field of laser technology, and in particular relates to an optical parameter amplification method for directly realizing energy amplification of femtosecond signal light pulses without chirp by using picosecond pulse pumping. Background technique [0002] Optical parametric amplification (OPA) has been one of the hotspots in laser research since it first achieved frequency conversion. Optical parametric amplification technology utilizes the nonlinear optical effect to couple the strong pump beam and weak signal light in the nonlinear optical crystal, which can amplify the signal light and generate new idle waves at the same time. Femtosecond OPA is an important method to obtain high-gain, narrow pulse width, and wide-tuned femtosecond pulses, and it has been widely used in many research fields. There is an urgent need for a method that can effectively amplify light pulses of 10 fs or even only a few optical periods. Curre...

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Problems solved by technology

This method adopts narrowband long pulse pump light and broadband chirped signal light pulse, although can obtain ultrashort ultraintense laser pulse output (S.Witte, R.Th.Zinkstok, A.L.Wolf, W.Hogervorst, W.Ubachs, and K.S.E.Eikema, "A source of 2 terawatt, 2.7 cycle laser pulses based on noncollinear optical parametric chirped pulse amplification," Opt.Expr., 2006, 14, 8168-8177), but a pulse stretcher and compressor must be applied, and a The use of non-collinear phase matching (NCPM) devices and angular dispersive elements for pulse tilting makes the structure of the OPCPA system very complex, and the ubiquitous time spike structure of nanosecond pump pulses will affect the output signal optical pulse after compression The signal-to-noise ratio (N.Forget, A.Cotel, E.Brambrink, P.Audebert, C.Le Blanc, A.Jullien, O.Albert, and G.Cheriaux, "Pump-noise transfer in opticalparametric chirped-pulse amplification , "2005, Opt.Lett., 30, 2921-2923), making the further development and application of OPCPA restricted

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