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Generation of 22.8 mW single-frequency green light by frequency doubling of a 50-mW diode laser

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Abstract

We report frequency doubling of an extended-cavity diode laser in an a-cut KTP crystal. Continuous-wave, single-mode green light at 540 nm with a power of 22.8 mW was generated from an input of 44.2 mW by type II non-critical phase matching. Stable operation with intensity fluctuations smaller than 1 % peak-to-peak for more than two hours was achieved by employing resonant optical feedback. The optical feedback also reduced the fundamental-wave linewidth to the upper limit of 41 kHz.

©2004 Optical Society of America

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Figures (4)

Fig. 1.
Fig. 1. The setup for frequency doubling of an ECDL in an a-cut KTP placed in an enhancement cavity. Abbreviations are HWP, half-wave plate; PP, prism pair; NDF, neutral density filter;PZT, piezo-electric transducer; PD, photo diode; PM, power meter; HS, harmonic separator.
Fig. 2.
Fig. 2. Measured dependence of (a) generated second harmonic power, (b) reflected fundamental power, on the input power. The dots are measured data. The curves are calculated from Eq. (3) and (2), respectively.
Fig. 3.
Fig. 3. Observed intensity stability of the generated second harmonic power. Even without electronic servo the diode laser frequency stayed locked to the cavity for more than an hour. By adding slow electronic servo the power stayed within 0.3% peak-to-peak for more than two hours.
Fig. 4.
Fig. 4. Spectrum of the fundamental wave observed with a non-confocal Fabry-Perot spectrum analyzer. The curve is the fit with a lorenzian.

Equations (3)

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P c P 1 = 4 T 1 m ( T 1 + L + E NL P c ) 2 ,
P ref P 1 = ( 1 T 1 ) ( 1 m ) + ( T 1 L E NL P c ) 2 ( T 1 + L + E NL P c ) 2 m ,
P 2 = T 2 E NL P c 2 ,
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