Regenerative amplifiers based on thin-disk technology have a high-beam quality output laser due to their own excellent thermal management. Conventional thin-disk regenerative amplifiers are usually constructed in a stable resonator design with a long resonator length, which limits the practical application range and further industrialization. We report a compact thin-disk regenerative amplifier with an overall resonator length of less than 2.5 m that enables high-beam-quality laser output. Continuous laser output of 66 W when the resonator is 2.16 m. 59 W of a pulsed laser with a repetition rate of 50 kHz was output at a resonator length of 2.3 m. The thin-disk regenerative amplifier has the potential to output a laser up to 100 mJ while maintaining good beam quality
Magnesium fluoride (MgF2) is a widely used optical window material in lasers. Laser-induced damage in MgF2 materials involves complex thermal-mechanical coupling issues. With the rapid development of high-power fiber laser technologies and application of optoelectronic countermeasures, it is necessary to investigate the damage mechanism of 1.06 μm high-power continuous-wave laser on MgF2 optical windows to clarify the laser damage threshold and factors influencing laser-irradiated MgF2 window mirrors. Therefore, based on the theory of heat conduction and elastic mechanics, a simulation study was conducted using the finite element method. First, based on the thermo-mechanical theory, established a thermo-mechanical damage model for a laser-irradiated MgF2 crystal. Second, we calculated the temperature, stress, and strain fields of single-crystal MgF2 material under the action of a 100 W / cm2 laser. When the laser was irradiated for 4.921 s, thermal stress-induced burst damage was observed, but no melting damage occurred. Finally, the impact of parameters such as the laser power density, spot size, and laser action time on the damage effect was discussed using the parametric scanning method. The calculation results showed that the aforementioned factors significantly impact the damaging effect. Moreover, under the same laser parameters, material burst due to thermal stress is expected to precede the melt damage.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.