Open AccessDegeneracy-analogous femtosecond dual-wavelength optical parametric oscillator at non-degenerate wavelengths
Author(s) -
Haizhe Zhong,
Fen Qin,
Yuhai Liang,
Jianlong Yang,
Shiwei Wang,
Ying Li,
Dianyuan Fan
Publication year - 2017
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.002529
Subject(s) - femtosecond , optical parametric oscillator , ultrashort pulse , optics , degeneracy (biology) , physics , wavelength , laser , degenerate energy levels , optoelectronics , quantum mechanics , bioinformatics , biology
Synchronously pumped optical parametric oscillator (OPO) at degeneracy is ideal for generating ultrafast laser pulses. Normally, however, group velocity mismatch (GVM) is ubiquitous among the interacting pulses at widely separated wavelengths. A versatile quasi-phase-matching (QPM) technique is proposed for temporal synchronizing of the signal and idler pulses relied on a less common Type-II QPM (oe-o interaction). The proposed group-velocity regulation technology is advantageous to constructing a degeneracy-analogous femtosecond OPO for dual-wavelength operation. Qualitative prediction for the proposed design is conducted based on a commercial femtosecond pump source at 1064 nm while the signal/idler wavelengths are 3.2 μm and 1.59 μm respectively. Compared with the conventional Type-0 QPM based counterpart (ee-e interaction), the uncompensated temporal distortion caused by temporal walk-off is strongly suppressed while the idler spectrum gets significantly broader. The versatility of the proposed scheme is also clearly demonstrated by its fairly stable performance within a broad tuning range of 2.9-3.5 μm and 1.68-1.53 μm. The demonstrated configuration might be promising for synchronously obtaining dual-wavelength ultrafast pulses with higher spectral and temporal qualities.