Fly second optical parameter amplifying method using picosecond pulse pumping

Abstract

The invention belongs to the technical field of lasers, and relates to a method for realizing direct optical parameter amplification (OPA) of non-chirped femtosecond signal pulses by using picosecond pump pulses. Due to crystal dispersion, the group velocities of signal light and pump light in the OPA crystal are different (called group velocity mismatch GVM), which makes the narrower femtosecond signal light pulse in the longer picosecond pump light pulse Relative slippage over the duration of the pulse. The present invention utilizes the pulse slip caused by the group velocity mismatch to realize that the entire pump pulse contributes to the amplification of the femtosecond pulse, so only one stage of OPA amplifier can provide sufficiently high gain. The method has the advantages of simple structure, high magnification, and wide enough gain spectrum to support extremely short ten femtosecond (10fs) pulse 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, 2.7cycle 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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