Miniaturized external-cavity diode laser and tapered amplifier in hermetic 14-pin butterfly

Daniel Brauda; Hendrick Thiem; Dennis Krug; Markus Schütz; Miroslawa Malach; Björn Globisch

doi:10.1117/12.3004656

12 March 2024 Miniaturized external-cavity diode laser and tapered amplifier in hermetic 14-pin butterfly

Daniel Brauda, Hendrick Thiem, Dennis Krug, Markus Schütz, Miroslawa Malach, Björn Globisch

Proceedings Volume 12866, Components and Packaging for Laser Systems X; 128660G (2024) https://doi.org/10.1117/12.3004656
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

For compact spectrometers with high resolution and especially for Quantum Technology (QT) of the second generation, compact, portable, and long-term stable systems are a prerequisite for the breakthrough of the technology. In this paper, we demonstrate a miniaturized external-cavity diode laser (miniECL), which is frequency stabilized with a Volume Bragg Grating (VBG), and a miniaturized fiber-coupled tapered amplifier (miniTA). Both devices feature a collimated output beam and are integrated in a hermetically sealed 14-pin butterfly module. Due to the external cavity design and a robust packaging process, the miniECL has a linewidth below 350 kHz with an output power ⪆ 80 mW at 670 nm, 770 nm, 780 nm, 852 nm, and 894 nm. These wavelengths correspond to the D1 and D2 transitions of Li, the D1 transition of K, the D2 transition of Rb and the D2 and D1 transition of Cs, respectively. Hence, the miniECL is perfectly suited to excite atomic transitions. In addition, the miniECL can be used as a seed laser for the miniTA, which amplifies its output power to 1.5 W - 3.0 W with excellent beam quality (M² between 1.3 and 1.7 and beam divergence ⪅ 3 mrad), while maintaining the narrow linewidth of the seed laser. The amplification bandwidth of the miniTA matches with the emission wavelength of the miniECL, which enables extremely compact Master Oscillator Power Amplifier (MOPA) setups.

Conference Presentation

Citation Download Citation

Daniel Brauda, Hendrick Thiem, Dennis Krug, Markus Schütz, Miroslawa Malach, and Björn Globisch "Miniaturized external-cavity diode laser and tapered amplifier in hermetic 14-pin butterfly", Proc. SPIE 12866, Components and Packaging for Laser Systems X, 128660G (12 March 2024); https://doi.org/10.1117/12.3004656

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