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Diode-pumped passively mode-locked Yb:YLF laser

N. Coluccelli, G. Galzerano, L. Bonelli, A. Di Lieto, M. Tonelli, and P. Laporta

Open Access Open Access

Abstract

We demonstrate passive mode-locking by means of a semi-conductor saturable-absorber mirror in a diode-pumped Yb:YLF laser. We present crystal growth process, spectroscopic measurements, and investigation of mode-locking performance. Pulse trains with minimum duration of 196 fs, average power of 54 mW and a repetition rate of 55 MHz were obtained. The optical spectrum, centered at 1028 nm, has a 7.1-nm bandwidth leading to nearly transform-limited pulses.

©2008 Optical Society of America

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Figures (5)
Fig. 1.
Fig. 1. Room-temperature absorption and emission cross sections of Yb3+ ions in YLF crystal with electric field polarizations (a) E‖c, and (b) E⊥c. Emission cross sections were evaluated with the reciprocity method for wavelengths shorter than 1020 nm and with the β-τ method for wavelengths longer than 1020 nm.

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Fig. 2.
Fig. 2. Gain cross-sections of Yb3+ ions in YLF crystal for inversion parameter β of 0.1, 0.15, 0.2, and 0.25, with electric field polarizations (a) E‖c, and (b) E⊥c.

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Fig. 3.
Fig. 3. Scheme of the mode-locked Yb:YLF laser cavity and pump system. LD1, LD2: laser diodes; F1, F2, F3, F4: lenses; M1, M2: folding mirrors; M3, focusing mirror; M4, M5: chirped mirrors; C: Yb-doped YLF crystal; OC: output coupler; SESAM: semiconductor saturable-absorber mirror.

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Fig. 4.
Fig. 4. Average output power versus incident pump power of the mode-locked Yb:YLF laser with polarization E‖c, and output couplings of 1% (squares), and 2% (circles). Mode-locking thresholds are indicated by arrows.

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Fig. 5.
Fig. 5. Autocorrelation trace and optical spectrum (inset) of the mode-locked Yb:YLF laser with polarization E‖c: (a) 1% output coupler ; (b) 2% output coupler. Sech2- pulse shape is assumed.

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