NDLI: Fluctuation-free CW Tm:YAP laser with monolithic resonator

Content Provider	IEEE Xplore Digital Library
Author	Sulc, J. Jelinkova, H. Nejezchleb, K. Skoda, V.
Copyright Year	2009
Description	Author affiliation: Crytur, Ltd. Turnov, Palackého 175, 51101, Czech Republic (Nejezchleb, K.; Skoda, V.) \|\| Czech Technical University in Prague, FNSPE, B¿ehová 7, 115 19 Prague 1, Czech Republic (Sulc, J.; Jelinkova, H.)
Abstract	Thulium-ion-based lasers with the emission wavelength near 2 µm have a number of usages from eye-safe laser ranging to medical applications because the output can be tuned to strong water absorption bands existing in 2 µm region. [1] An attractive laser host for thulium is an yttrium aluminium oxide YAlO3 (YAP,YAlO) due to its natural birefringence combined with good thermal and mechanical properties similar to those of YAG. [2] In our previous work we have observed instantaneous fluctuations (spiking) of Tm:YAP laser CW output, which can be explained by weak saturable assumption of water vapors inside the resonator and mechanical instability of laser. Such behavior of laser output can be inconvenient in applications like Cr:ZnSe laser pumping. The goal of our work was the comparison of diode pumped Tm:YAP laser with external resonator and with monolithic resonator. In both cases the Tm:YAP crystals with the same parameters were used: doping 4 at. % Tm/Y, length 3 mm, diameter 3 mm, a-cut (Pbnm) of Tm:YAP. The Tm:YAP crystal used in external resonator was provided with antireflection coating centered at 795 nm and 1900 nm. A 30 mm long semi-hemispherical laser resonator was used (output mirror curvature was 150 mm). In case monolithic Tm:YAP laser resonator mirrors were deposited directly on laser crystal. For the generated laser radiation the output coupler reflectivity was 97 % in both cases. For the laser pumping, a fibre coupled laser diode operating at wavelength 0.79 µm was used. The 400 µm fiber was delivering up to 25 W of pump power to the coupling optics. Both lasers were studied under the same pumping and cooling conditions. The obtained results are presented in Fig. 1.
Starting Page	1
Ending Page	1
File Size	1048470
Page Count	1
File Format	PDF
ISBN	9781424440795
DOI	10.1109/CLEOE-EQEC.2009.5194782
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-14
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power lasers Optical resonators Laser stability Laser modes Laser excitation Laser beams Mirrors Laser tuning Pump lasers Fiber lasers
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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