Generation of single-frequency tunable green light in a coupled ring tapered diode laser cavity.

We report the realization of a tapered diode laser operated in a coupled ring cavity that significantly improves the coherence properties of the tapered laser and efficiently generates tunable light at the second harmonic frequency. The tapered diode laser is tunable with single-frequency output in the broad wavelength range from 1049 nm to 1093 nm and the beam propagation factor is improved from M(2) = 2.8 to below 1.1. The laser frequency is automatically locked to the cavity resonance frequency using optical feedback. Furthermore, we show that this adaptive external cavity approach leads to efficient frequency doubling. More than 500 mW green output power is obtained by placing a periodically poled LiNbO(3) crystal in the external cavity. The single frequency green output from the laser system is tunable in the 530 nm to 533 nm range limited by the LiNbO(3) crystal. The optical to optical conversion efficiency exceeds 30%.

[1]  B. Sumpf,et al.  High power 404 nm source based on second harmonic generation in PPKTP of a tapered external feedback diode laser. , 2008, Optics express.

[2]  A. Jechow,et al.  Quasi-monolithic ring resonator for efficient frequency doubling of an external cavity diode laser , 2010 .

[3]  Ole Bjarlin Jensen,et al.  Efficient concept for generation of diffraction-limited green light by sum-frequency generation of spectrally combined tapered diode lasers. , 2012, Optics letters.

[4]  Katrin Paschke,et al.  Blue‐green light generation using high brilliance edge emitting diode lasers , 2010 .

[5]  David J. Webb,et al.  Blue light generation by resonator‐enhanced frequency doubling of an extended‐cavity diode laser , 1994 .

[6]  Ole Bjarlin Jensen,et al.  1.5 W green light generation by single-pass second harmonic generation of a single-frequency tapered diode laser. , 2009, Optics express.

[7]  B. Sumpf,et al.  Widely Tunable High-Power Tapered Diode Laser at 1060 nm , 2011, IEEE Photonics Technology Letters.

[8]  Bernd Sumpf,et al.  High-power 808 nm lasers with a super-large optical cavity , 2005 .

[9]  Benno Willke,et al.  Continuous-wave single-frequency 532 nm laser source emitting 130 W into the fundamental transversal mode. , 2010, Optics letters.

[10]  Katrin Paschke,et al.  Efficient second-harmonic generation using a semiconductor tapered amplifier in a coupled ring-resonator geometry. , 2010, Optics letters.

[11]  John L. Carlsten,et al.  Blue light generation in an external ring cavity using both cavity and grating feedback , 2000 .

[12]  R. Bhat,et al.  107-mW low-noise green-light emission by frequency doubling of a reliable 1060-nm DFB semiconductor laser diode , 2006, IEEE Photonics Technology Letters.

[13]  Andreas Jechow,et al.  Efficient blue light generation by frequency doubling of a broad-area diode laser in a compact external cavity , 2007 .