The emergence of highly efficient short-wavelength laser diodes based on the III-V compound semiconductor GaN has not only enabled high-density optical data storage, but is also expected to revolutionize display applications. Moreover, a variety of scientific applications in biophotonics, materials research and quantum optics can benefit from these versatile and cost-efficient laser light sources in the near-UV to green spectral range. This thesis describes the device physics of GaN-based laser diodes, together with recent efforts to achieve longer emission wavelengths and short-pulse emission.
Towards Longer Wavelengths and Short Pulses
Experimental and theoretical approaches are employed to address the individual device properties and optimize the laser diodes toward the requirements of specific applications. Herman Gewirtz. S P Sukhatme. A Student's Guide to the Mathematics of Astronomy. Daniel Fleisch. Christine Caputo. Mechanical Engineer's Handbook. Dan B. Basics of Physics. Knowledge flow. Lessons from Nanoelectronics.
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- Topic: Diode lasers for sensor & analytics applications.
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A further increase in current above 85 mA led to a shift towards longer wavelength and a broadening of the gain spectra. This behavior again was caused by resistive heating of the device.
Also in this case it was possible to return to the previous emission spectrum by decreasing the current to the former value and we were able to operate the devices under these conditions for several hours without seeing a significant increase in threshold current. In order to accomplish this goal a further reduction in threshold current and voltage. The inset shows the light output vs current characteristics of the same device.
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GaN-Based Laser Diodes : Towards Longer Wavelengths and Short Pulses
Raman spectroscopy is an established method to analyze organic and inorganic substances. The FBH bridges the gap between various life science applications and high-end diode laser technology.
This enables the development of suitable light sources for high-precision Raman measurements that were already successfully performed on food, soil, plants, and human skin. For several years now, mobile devices like handheld sensors are commercially available and open up application fields including point-of-care diagnostics, on-site food inspection and detection of hazardous substances.
Still, Raman signals are weak, and additional challenges have to be considered. Laser-induced fluorescence originating, for example, from biological samples or ambient light such as daylight could mask the Raman signals and hence complicate identification, especially for unknown substances.
However, the shifted excitation Raman difference spectroscopy SERDS approach is a powerful and easy-to-use spectroscopic technique to overcome these drawbacks.
SERDS requires an excitation light source with two individually controllable emission lines.