Abstract
We report on a simple and accurate method for determination of thermo-optical and spectroscopic parameters (thermal diffusivity, temperature coefficient of the optical path length change, pump and fluorescence quantum efficiencies, thermal loading, thermal lens focal length, etc) of relevance in the thermal lensing of end-pumped neodymium lasers operating at 1.06- and 1.3- microm channels. The comparison between thermal lensing observed in presence and absence of laser oscillation has been used to elucidate and evaluate the contribution of quantum efficiency and excited sate absorption processes to the thermal loading of Nd:YAG lasers.
Highlights
Pump and laser induced Thermal Lens (TL) is a crucial effect in laser materials, especially when operating in an end-pumping configuration
We demonstrated that the analysis of laser and TL data allows a precise determination of several important laser and spectroscopic parameters: DTL, the pump efficiency, the fractional thermal loading (φ), and the effect of excited state absorption (ESA) on φ at 1.34 μm
The smaller amplitude of the TL signal with laser oscillation is an indication of reduced heat generation
Summary
Pump and laser induced Thermal Lens (TL) is a crucial effect in laser materials, especially when operating in an end-pumping configuration (due to the much localized heat deposition achieved in this case). In some cases the presence of excited state absorption (ESA) and/or Auger upconversion at laser wavelength could lead to the appearance of additional heating sources different to those associated to pump radiation [5,6] It is very important for an accurate determination of these properties, the realization of the measurements with the system in real conditions of functionality, i.e., in the presence of laser oscillation. We demonstrated that the analysis of laser and TL data (without and with laser oscillation at 1.064 and 1.34 μm) allows a precise determination of several important laser and spectroscopic parameters: DTL, the pump efficiency (at 808nm), the fractional thermal loading (φ), and the effect of ESA on φ at 1.34 μm
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
