Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theory of three-pulse photon echo spectroscopy with dual frequency combs   A theoretical analysis is carried out for the recently developed three-pulse
photon echo spectroscopy employing dual frequency combs (DFC) as the light
sources. In this method, the molecular sample interacts with three pulse trains
derived from the DFC and the generated third-order signal is displayed as a
two-dimensional (2D) spectrum that depends on the waiting time introduced by
employing asynchronous optical sampling method. Through the analysis of the
heterodyne-detected signal interferogram using a local oscillator derived from
one of the optical frequency combs, we show that the 2D spectrum closely
matches the spectrum expected from a conventional approach with four pulses
derived from a single femtosecond laser pulse and the waiting time between the
second and third field-matter interactions is given by the down-converted
detection time of the interferogram. The theoretical result is applied to a
two-level model system with solvation effect described by solvatochromic
spectral density. The model 2D spectrum reproduces spectral features such as
the loss of frequency correlation, dephasing, and spectral shift as a function
of the population time. We anticipate that the present theory will be the
general framework for quantitative descriptions of DFC-based nonlinear optical
spectroscopy.

11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin