Versatile turnkey laser system operating multi-section diode lasers and diode laser systems in the VIS and NIR spectral range

Bernd Sumpf; Lucas Wittenbecher; Thomas Filler; Daniel Bandke; Maria Krichler; André Müller; Kay Sowoidnich; Arnim Ginolas; Neysha Lobo-Ploch; Martin Maiwald

doi:10.1117/12.2692859

11 March 2024 Versatile turnkey laser system operating multi-section diode lasers and diode laser systems in the VIS and NIR spectral range

Bernd Sumpf, Lucas Wittenbecher, Thomas Filler, Daniel Bandke, Maria Krichler, André Müller, Kay Sowoidnich, Arnim Ginolas, Neysha Lobo-Ploch, Martin Maiwald

Author Affiliations +

Proceedings Volume 12893, Photonic Instrumentation Engineering XI; 1289309 (2024) https://doi.org/10.1117/12.2692859
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Diode laser based light sources (implemented monolithically or in a hybrid configuration) offer various functionalities to meet the requirements of specific applications. This includes tuning or switching between different wavelengths, modulating the optical output power, or implemented frequency conversion. Such light sources often contain multisection diode lasers or several active elements. Their operation requires multiple individually adjustable current sources, galvanically isolated current sources, and temperature control. A suitable optical interface should be available for a subsequent integration of the turnkey into the addressed application. In this contribution, a versatile turnkey system meeting the above-mentioned requirements will be presented. Ten p-type current sources, each with currents up to 750 mA, and four galvanically decoupled current sources are implemented. The ten individual sources enable switching frequencies up to 1 kHz and can be combined to provide currents up to 7.5 A. A temperature control unit capable to remove 10 W thermal load using a Peltier element completes the system, which contains an internal microcontroller, trigger in- and outputs, and an USB interface for the integration into various environments. Moreover, fiber coupling and free space optics to transfer the laser emission are offered. Turnkey systems containing in-house developed light sources at 488 nm or 785 nm were implemented into portable Raman spectroscopic measurement systems. To separate Raman signals from background disturbances, shifted excitation Raman difference spectroscopy (SERDS) was applied using dual-wavelength light sources. Systems addressing the measurement of carotenoids under clinical conditions and soil properties in the field will be presented.

Conference Presentation

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Bernd Sumpf, Lucas Wittenbecher, Thomas Filler, Daniel Bandke, Maria Krichler, André Müller, Kay Sowoidnich, Arnim Ginolas, Neysha Lobo-Ploch, and Martin Maiwald "Versatile turnkey laser system operating multi-section diode lasers and diode laser systems in the VIS and NIR spectral range", Proc. SPIE 12893, Photonic Instrumentation Engineering XI, 1289309 (11 March 2024); https://doi.org/10.1117/12.2692859

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