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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 20 — Oct. 7, 2013
  • pp: 23365–23375

Directly phase-modulation-mode-locked doubly-resonant optical parametric oscillator

Kavita Devi, S. Chaitanya Kumar, and M. Ebrahim-Zadeh  »View Author Affiliations


Optics Express, Vol. 21, Issue 20, pp. 23365-23375 (2013)
http://dx.doi.org/10.1364/OE.21.023365


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Abstract

We present results on direct mode-locking of a doubly-resonant optical parametric oscillator (DRO) using an electro-optic phase modulator with low resonant frequency of 80 MHz as the single mode-locking element. Pumped by a cw laser at 532 nm and based on MgO:sPPLT as the nonlinear material, the DRO generates 533 ps pulses at 80 MHz and 471 ps pulses at 160 MHz. Stable train of mode-locked pulses is obtained at a modulation depth of 1.83 radians when the modulation frequency is precisely tuned and the cavity length is carefully adjusted. The effects of frequency detuning, modulation depth, input laser pump power, crystal temperature and position of modulator inside the cavity, on pulse duration and repetition rate have been studied. Operating at degeneracy, under mode-locked condition, the signal-idler spectrum exhibits a bandwidth of ~31 nm, and the spectrum has been investigated for different phase-matching temperatures. Mode-locked operation has been confirmed by second-harmonic-generation of the DRO output in a β-BaB2O4 crystal, where a 4 times enhancement in green power is observed compared to cw operation.

© 2013 OSA

OCIS Codes
(140.4050) Lasers and laser optics : Mode-locked lasers
(190.4360) Nonlinear optics : Nonlinear optics, devices
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: June 21, 2013
Revised Manuscript: September 13, 2013
Manuscript Accepted: September 16, 2013
Published: September 25, 2013

Citation
Kavita Devi, S. Chaitanya Kumar, and M. Ebrahim-Zadeh, "Directly phase-modulation-mode-locked doubly-resonant optical parametric oscillator," Opt. Express 21, 23365-23375 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-20-23365


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