Abstract

We report on watt level mid-infrared (MIR) wavelength generation using intra-cavity ZnGeP<sub>2</sub> (ZGP) optical parametrical oscillator (OPO) within a 2.1&mu;m Ho:YAG laser. A compact cavity of less than 50cm was designed for the intra-cavity OPO setup. With the same laser setup, watt level of both 2.1&mu;m and MIR wavelengths were generated. An average output power of &gt;20W of 2.1&mu;m and &gt;1W of MIR wavelength at 10 KHz repetition rate were achieved from a 46W Tm fiber pump laser. The Ho:YAG laser was resonantly pumped by a 1.9&mu;m Tm:fiber laser and nanosecond pulses were generated using an electro-optics q-switch modulator. With the use of a &lambda;/4 waveplate and a thin film polarizer, a variable output coupler for the Ho:YAG laser was formed where we could optimize the output coupling to achieve 21W of 2.1&mu;m wavelength. MIR wavelengths were generated using commercial ZGP crystals from Inrad. A HR mirror for the MIR wavelengths was inserted into the Ho:YAG cavity to form the intra-cavity ZGP OPO. The rear mirror of the Ho:YAG cavity act as the output coupler with R=70% for the MIR wavelengths. Optimizing of the MIR generation was done by tuning the phase-matching angle of the ZGP and adjusting the cavity length of the OPO. A preliminary result of the intra-cavity ZGP OPO generates &gt;1W of MIR wavelength.

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 call

Disclaimer: 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.