Sub-10-fs pulse generation from a blue laser-diode-pumped Ti:sapphire oscillator

Han Liu; Geyang Wang; Jianwang Jiang; Wenlong Tian; Dacheng Zhang; Hainian Han; Shaobo Fang; Jiangfeng Zhu; Zhiyi Wei

doi:10.3788/COL202018.071402

Journals >Chinese Optics Letters >Volume 18 >Issue 7 >Page 071402 > Article

Chinese Optics Letters
Vol. 18, Issue 7, 071402 (2020)

Sub-10-fs pulse generation from a blue laser-diode-pumped Ti:sapphire oscillator | Editors' Pick

Han Liu¹, Geyang Wang¹, Jianwang Jiang¹, Wenlong Tian¹, Dacheng Zhang¹, Hainian Han², Shaobo Fang², Jiangfeng Zhu^1、*, and Zhiyi Wei²

Author Affiliations

¹School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China

²Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

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DOI: 10.3788/COL202018.071402 Cite this Article Set citation alerts

Han Liu, Geyang Wang, Jianwang Jiang, Wenlong Tian, Dacheng Zhang, Hainian Han, Shaobo Fang, Jiangfeng Zhu, Zhiyi Wei. Sub-10-fs pulse generation from a blue laser-diode-pumped Ti:sapphire oscillator[J]. Chinese Optics Letters, 2020, 18(7): 071402 Copy Citation Text

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Experimental setup of the blue LD-pumped Ti:sapphire oscillator. A 455 nm LD was used with a beam shaping system (L1, L2, and L3) as the pump source. The lens L4 focused the pump into a Ti:sapphire crystal, with the pump spot as shown in the inset. Curved double-chirped mirrors DCM1 and DCM2, flat double-chirped mirrors DCM3 and DCM4, output-coupling mirror OC, and prism pair P1 and P2 formed the laser cavity. Chirped mirrors CM5 and CM6 and a pair of wedges were used for extra-cavity dispersion compensation.

Fig. 1. Experimental setup of the blue LD-pumped Ti:sapphire oscillator. A 455 nm LD was used with a beam shaping system (

L_{1}

L_{2}

, and

L_{3}

) as the pump source. The lens

L_{4}

focused the pump into a Ti:sapphire crystal, with the pump spot as shown in the inset. Curved double-chirped mirrors

{DCM}_{1}

and

{DCM}_{2}

, flat double-chirped mirrors

{DCM}_{3}

and

{DCM}_{4}

, output-coupling mirror OC, and prism pair

P_{1}

and

P_{2}

formed the laser cavity. Chirped mirrors

{CM}_{5}

and

{CM}_{6}

and a pair of wedges were used for extra-cavity dispersion compensation.

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Fig. 2. (a) Reflectivity of the mirrors in the cavity. (b) Round-trip GDDs of the Ti:sapphire crystal, seven DCMs, prism pair, air, and their total sum.

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Fig. 3. Pulse profiles of the LD-pumped Ti:sapphire oscillator. (a) Mode-locking spectrum. Inset shows the FTL pulse in the time domain. (b) IAC trace of the pulse (blue curve), and an envelope of a theoretical

{sech}^{2}

pulse of 9.8 fs (red curve).

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Fig. 4. Pulse profiles after adjusting the prism insertion. (a) Mode-locking spectrum. Inset shows the FTL pulse in the time domain. (b) IAC trace of the shortest pulse generated from the Ti:sapphire oscillator (blue curve) and theoretical IAC envelope of a

{sech}^{2}

pulse of 8.1 fs (red curve).

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Fig. 5. RF spectra of the 8.1 fs Kerr-lens mode-locked Ti:sapphire laser, with an RBW of 1 kHz. The inset shows the RF spectrum in the 1 GHz range with a 100 kHz resolution.

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Fig. 6. Power stability of the single LD-pumped Kerr-lens mode-locked Ti:sapphire oscillator over 3 h.

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