Temporal dynamics of the multi-frequency spectrum generated by self-phase modulation of two frequencies in single-mode fiber
The authors report the development of a tunable bandwidth source based on self-phase modulation of two frequencies in an optical fiber. A single frequency pulse was obtained by placing a 688 {mu}m etalon with finesse = 3.3 in a single mode, single frequency Q-switched ND:YLF oscillator. Angle tuning of the etalon allowed continuous frequency tuning of the oscillator by {+-} 2.5 {angstrom} about the central frequency of 10,530.3 {angstrom}. Two oscillators were modified and tuned to 10,532.8 {angstrom} and 10,527.8 {angstrom}, respectively. Additional tests performed with a 344 {mu}m etalon allowed tuning of {+-}5 {angstrom}, but with reduced output energy and stability ({+-} 20%); however, pulse to pulse energy fluctuations can be compensated for by the use of a pulse energy regulator if a broader range of tunability is required. The output beams were temporally and spatial overlapped, and shortened to an 11 ns nominally square pulse with a 3 ns rise and fall via a Pockels cell. Two Pockels cells were required to reduce nonlinear effects in the fiber due to prelase signal. The two frequencies were coupled into a 10 m single-mode polarization preserving fiber with a 4.2 x 7.4 {mu}m core diameter and an effective mode area of 64 {mu}m. The beam energy was recorded at the input and output of the fiber. The output spectrum was recorded with a spectrometer/optical multichannel analyzer, and the temporal pulse shape of each frequency was recorded by spectrally dispersing the far field beam and re-imaging it onto a streak camera.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 71359
- Report Number(s):
- UCRL-JC-117360; CONF-941006-6; ON: DE95010920; TRN: AHC29517%%109
- Resource Relation:
- Conference: SPIE annual conference of the Optical Society of America and exhibit, Boston, MA (United States), 30 Oct - 4 Nov 1994; Other Information: PBD: Jun 1994
- Country of Publication:
- United States
- Language:
- English
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