Method of pulse compression for cascaded optical parametric amplification system

Abstract

The invention discloses a method of pulse compression for a cascaded optical parametric amplification system, which is characterized in that: a hollow-fiber compression device is added to the light path of first-class pump light, and the pulse width of the first-class pump light output by the hollow-fiber compression device is compressed to a cycle magnitude, first-class pump light and signal light of the cycle magnitude pass through a first-class optical parametric amplifier, and generates the first-class signal light and first-class idling light, meanwhile, the first-class signal light or the first-class idling light are selected as the signal light of a second-class optical parametric amplifier. The invention avoids the immature infrared compression technology and utilizes the mature compression technology near 800 nm to reach the same expected effect, and the energy loss is greatly reduced, meanwhile, the light-source output performance of OPA system is better, and the invention is beneficial for generating higher harmonic wave, even is beneficial for the application of the single attosecond pulse experiment.

Description

technical field [0001] The invention relates to a pulse compression method for a cascaded optical parameter amplification system, which uses a hollow fiber pulse compression device for the first-stage pump light of the optical parameter amplification system, and belongs to the field of laser technology. It is characterized in that the pumping light of the first stage in the cascaded OPA is compressed by using a hollow fiber compression system filled with inert gas, so that the OPA system finally obtains a laser pulse output with a pulse width equivalent to that of the pumping light of the first stage. This device converts the demand for infrared compression into the demand for visible light compression, optimizes the output pulse of the OPA system, making the pulse width as short as the cycle level, high energy loss and extremely low, high-order harmonic experiment, attosecond pulse generation And other physical experiments provide strong support. Background technique [00...

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Problems solved by technology

The disadvantage is that this technology does not have the function of pulse compression, and the single attosecond pulse compressed by the 30fs to 40fs laser pulse emitted by the titanium sapphire laser cannot generate the cycle level required by the experiment.

Using this method, the output pulse energy has been improved, but it is still only a few hundred microjoules. In addition, this method requires dispersion compensation for the pulse with a central wavelength of 1425nm, but at present, the infrared compression technology is still immature and suitable for The chirped mirror for compensating dispersion in this region is still in the research and development stage, and the price is too expensive to be widely used

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