Single-transverse-mode Ti:sapphire rib waveguide laser

C. Grivas; D. P. Shepherd; T. C. May-Smith; R. W. Eason; M. Pollnau

doi:10.1364/OPEX.13.000210

Optics Express
Vol. 13,
Issue 1,
pp. 210-215
(2005)
•https://doi.org/10.1364/OPEX.13.000210

Single-transverse-mode Ti:sapphire rib waveguide laser

C. Grivas, D. P. Shepherd, T. C. May-Smith, R. W. Eason, and M. Pollnau

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C. Grivas, D. P. Shepherd, T. C. May-Smith, R. W. Eason, and M. Pollnau, "Single-transverse-mode Ti:sapphire rib waveguide laser," Opt. Express 13, 210-215 (2005)

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Abstract

Laser operation of Ti:sapphire rib waveguides fabricated using photolithography and ion beam etching in pulsed laser deposited layers is reported. Polarized laser emission was observed at 792.5 nm with an absorbed pump power threshold of 265 mW, which is more than a factor of 2 lower in comparison to their planar counterparts. Measured beam propagation factors $M_{x}^{2}$ and $M_{y}^{2}$ of 1.3 and 1.2, respectively, indicated single-transverse-mode emission. A quasi-cw output power of 27 mW for an absorbed pump power of 1W and a slope efficiency of 5.3% were obtained using an output coupler of 4.6% transmission with a pump duty cycle of 8%.

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Fig. 1. Experimental configuration for the investigation of the rib waveguide lasers. The laser cavity is formed by the mirrors M₁ and M₂. The geometry of the resulting structure after the fabrication process is shown in the inset.

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Fig. 2. Lasing spectrum originating from a Ti:sapphire rib waveguide for an absorbed pump power of 350 mW. The structure was 3.5 µm and 10 µm in height and width, respectively.

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Fig. 3. Output power from a rib waveguide laser with height and width of 3.5 µm and 10 µm, respectively, as a function of the absorbed power for an output coupler with a 4.6% transmission at the lasing wavelength

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Fig. 4. Laser mode profile obtained from a Ti:sapphire rib waveguide of height 3.5 µm and width 10 µm using a 4.6 % output coupler at an absorbed power of 350 mW.

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η = η_{q} \frac{λ_{p}}{λ_{l}} \cdot \frac{- \ln (R_{2})}{- \ln (R_{1} \cdot R_{2}) + 2 \cdot l \cdot a_{L}} \cdot η_{pl}

η_{pl} = \frac{W_{lx} \cdot W_{ly} \cdot {({2 W}_{px}^{2} + W_{lx}^{2})}^{1 ⁄ 2} \cdot {({2 W}_{py}^{2} + W_{ly}^{2})}^{1 ⁄ 2}}{(W_{px}^{2} + W_{lx}^{2}) \cdot (W_{py}^{2} + W_{ly}^{2})}

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