The Measurement of Ultrashort Optical Parametric Oscillator Pulses

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Sadighi Bonabi, Sakineh | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 41856 (04)
University: Sharif University of Technology
Department: physics
Advisor(s): Anvari, Abbas; Ebrahim-Zadeh, Majid; Sadighi Bonabi, Rasoul
Abstract:
The picosecond (ps) pulses in a synchronously pumped optical parametric oscillator (SPOPO) is generated by a 20W and 81.1 MHz Yb fiber laser at 1064nm, providing 11.7 W of total average power in near to mid-IR at 73% efficiency so that the signal pulse with a wavelength of 1560 nm and 7.1W average power and 3330 nm idler pulse with an average power of about 4.6W has been produced. The optical parametric oscillator (OPO), based on a 50 mm MgO:PPLN crystal with 5 gratings which is capable of withstanding large average powers without thermal effects.
The duration of these ultrashort infrared signal pulse generated by the described SPOPO is measured by using homemade interferometric autocorrelator. For this purpose the signal pulse with a wavelength of 1560 nm and 499 mW average power produced by 20.8 ps pump pulse with a 285 mW average power and 1064 nm wavelength has been studied. The measured signal pulse duration by assuming the sech function pulse shape and the Gaussian pulse shape was 30.8 ps and 28.7 ps, respectively
Keywords:
Autocorrelation ; Ultrashort Pulsed Lasers ; Nonlinear Optics ; Optical Prametric Oscillator

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