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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 36 — Dec. 20, 2012
  • pp: 8877–8882

Ultrasensitive detection of amplified spontaneous emission at 710 nm by means of picosecond collinear optical parametric amplification near degeneracy

Jing Zhang, Qiu-lin Zhang, Kang-sheng Qiu, Man Jiang, Dong-xiang Zhang, Bao-hua Feng, and Jing-yuan Zhang  »View Author Affiliations

Applied Optics, Vol. 51, Issue 36, pp. 8877-8882 (2012)

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We report the experimental results on improving the detection of an ultraweak optical signal using a 355 nm pumped picosecond collinear optical parametric amplification (OPA). The OPA is seeded by the amplified spontaneous emission (ASE) generated in a solution of pyridine-1 dye in ethanol. The gain factor of this amplifier is determined as 1.5×108, and the detection limit is 1.25aJ per pulse, corresponding to five photons at 710 nm within the 15 ps pulse width of the pump beam. This is achieved by reducing superfluorescence background noise by means of signal/idler double seeding near degeneracy, amplification under a slightly phase-mismatched condition, and space filtering with increasing observation distance up to 3.2 m. Compared with previous reports, the detection limit is significantly enhanced. The pulse shape of the ASE is also measured with OPA, and it agrees well with that measured by an ultrafast oscilloscope.

© 2012 Optical Society of America

OCIS Codes
(040.1880) Detectors : Detection
(040.3780) Detectors : Low light level
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers

ToC Category:

Original Manuscript: October 15, 2012
Revised Manuscript: November 26, 2012
Manuscript Accepted: November 27, 2012
Published: December 20, 2012

Jing Zhang, Qiu-lin Zhang, Kang-sheng Qiu, Man Jiang, Dong-xiang Zhang, Bao-hua Feng, and Jing-yuan Zhang, "Ultrasensitive detection of amplified spontaneous emission at 710 nm by means of picosecond collinear optical parametric amplification near degeneracy," Appl. Opt. 51, 8877-8882 (2012)

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