Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Group delay dispersion tuned femtosecond Kerr-lens mode-locked
  Ti:sapphire laser   We report on a new design for a femtosecond Ti:sapphire oscillator in which
dispersion compensation is realized exclusively using mirrors, including
special mirrors with third order dispersion. This makes the oscillator
dynamically tunable over a spectral range of 45 nm using an intracavity
wedge-pair; and it delivers 40 fs pulses at 80 MHz repetition rate. Due to the
all-mirror design, the oscillator represents an attractive base for a tunable
frequency comb for high precision spectroscopy applications.

2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs