Abstract
A compact and highly efficient 670.8-nm semi-conductor master oscillator power amplifier (MOPA) system, with a unique optical design, is demonstrated. The MOPA system achieves a continuous-wave (CW) output power of 2.2 W, which is much higher than commercial products using semi-conductor devices. By comparing solid state lasers and dye lasers, higher wall-plug efficiency (WPE) of 20 % is achieved. Our developed laser system also achieves spectral line-width of 0.3 pm (200 MHz) and mode-hop free tuning range of 49 pm (32.6 GHz), which is very suitable for experiments of lithium atomic physics at several-watt power levels, such as Bose-Einstein condensation (BEC) and isotope absorption spectroscopy.
Highlights
Nowadays, 670.8-nm tunable lasers with high power, compact volume and high efficiency are demanded for experiments of lithium atomic physics, such as atomic cooling and trapping [1,2,3], and isotope absorption spectroscopy [4].Several approaches have been demonstrated previously
Solid state lasers usually yield 1342-nm lasing by Nd:YVO4 or Nd:YAP crystal at first, shift to 671-nm lasing by second harmonic generation (SHG), which can achieve output optical power of 1.2 W [5,6]
A mode-hop free wavelength tuning range of 49 pm (32.6 GHz) and spectral investigated in the experiment
Summary
670.8-nm tunable lasers with high power, compact volume and high efficiency are demanded for experiments of lithium atomic physics, such as atomic cooling and trapping [1,2,3], and isotope absorption spectroscopy [4]. Dye lasers can directly yield 671-nm pulsed lasing by pumping light, without using SHG, which can achieve average optical power of 2 W and is commercially available [7]. They are usually large in volume and toxic. Commercial tunable lasers based on semi-conductor devices can only achieve a CW output power of 500 mW [9–11]. They usually use a very simple master oscillator power amplifier (MOPA) scheme, which includes only one tapered semi-conductor optical amplifier (SOA). Our expanded scheme of laser optical system can achieve much higher CW output power than commercial products, good performance of narrow linewidth and wavelength tuning remains
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