NDLI: 100mJ Q-switched Er:YAG diode-pumped laser system

Content Provider	IEEE Xplore Digital Library
Author	Larat, C. Schwarz, M. Lallier, E. Durand, E.
Copyright Year	2013
Description	Author affiliation: Thales Res. & Technol. France, Palaiseau, France (Larat, C.; Schwarz, M.; Lallier, E.) \|\| Thales Optronique SAS, Elancourt, France (Durand, E.)
Abstract	Summary form only given. This work deals with high energy eye-safe lasers for long-distance active imagery purpose. Direct resonant pumping of erbium appears as a very promising technique, either at 1530 nm with fibre lasers or at 1470 nm with laser-diodes [1-3]. Indeed, the long lifetime (5-10 ms) of the upper laser level ensure a favourable energy storage capability and the resonant scheme leads to a reduced thermal loading if compared with usual pumping at 980 nm in codoped Er-Yb materials. It is worth noting that only the summary is available for the ref [2] claiming the same energy than presented here. Our laser system rely on Er:YAG crystals and fibre coupled laser diode bars. The doping level of the gain medium is 0.5%. Each pump fibre (400μm diameter, 0.2 numerical aperture) delivers 120W at 1470nm. Each crystal is end-pumped on its two faces. The laser system (see Fig. 1) consists in an oscillator and to single pass amplifiers. Each pump fibre is imaged with a magnification of 4 (3) in the oscillator (amplifier) crystal. Dichroic mirrors (DM) ensure efficient laser reflection and good pump transmission. The output coupler (OC) has a 40% transmission coefficient and the Q-Switching is performed with an acousto-optic cell (QS). The pump are driven with 6ms pulses at 30Hz. Pair of lenses (PL) are used between the oscillator and each amplifiers to adjust the laser beam size and compensate for thermal lensing in the gain medium. Main results are reported in Fig. 2.To avoid damages of the dichroic mirrors, the Q-Switch was activated with a delay after the end of the pump pulse. Reducing this delay increases the output energy and thus the laser fluence. A delay shorter than 0.2ms usually damages the dichroic mirror. We demonstrated an oscillator output energy of 50mJ and a gain of 40-45% for each amplifier, leading to 100mJ output energy for the laser system. The pulse width is 100ns. The beam quality slightly degrades along the amplifier from M2x=2.5 / M2y=2.0 at the oscillator output to M2x=3.7 / M2y=3.1 at the laser system output.
Sponsorship	Eur. Phys. Soc.
Starting Page	1
Ending Page	1
File Size	402242
Page Count	1
File Format	PDF
e-ISBN	9781479905942
DOI	10.1109/CLEOE-IQEC.2013.6801947
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-05-12
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Semiconductor lasers Erbium-doped fiber lasers Laser excitation Laser beams Pump lasers Oscillators
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

1,64 mkm Er:YAG laser resonantly pumped by a solid state Er:glass laser

Cladding pumped Q-switched fiber laser using a tapered fiber saturable absorber

Diode-pumping high-power Q-switched fiber laser at 2.8 /spl mu/m

Compact, highly efficient, passively Q-switched Nd:YAG MOPA for spaceborne bepi colombo laser-altimeter

Diode-pumped coupled-cavity Q-switched Er,Yb:glass microchip lasers

A highly-efficient, 2.9 μm Q-switched Ho/Pr co-doped fiber laser

All-fiber passively Q-switched low-threshold erbium laser

Diode-pumped one Joule per Q-switched pulse 2μm laser

High energy Q-switched Er-doped fiber laser

100mJ Q-switched Er:YAG diode-pumped laser system

Similar Documents

1,64 mkm Er:YAG laser resonantly pumped by a solid state Er:glass laser

Cladding pumped Q-switched fiber laser using a tapered fiber saturable absorber

Diode-pumping high-power Q-switched fiber laser at 2.8 /spl mu/m

Compact, highly efficient, passively Q-switched Nd:YAG MOPA for spaceborne bepi colombo laser-altimeter

Diode-pumped coupled-cavity Q-switched Er,Yb:glass microchip lasers

A highly-efficient, 2.9 μm Q-switched Ho/Pr co-doped fiber laser

All-fiber passively Q-switched low-threshold erbium laser

Diode-pumped one Joule per Q-switched pulse 2μm laser

High energy Q-switched Er-doped fiber laser

100mJ Q-switched Er:YAG diode-pumped laser system