Query: A CW Side-Pumped Tm:YLF Laser

Candidate papers:

abstract: The lighting market has recently improved LED performance by orders of magnitudes. In parallel, massive production decreases dramatically LED price. Those improvements triggered new interests for LED pumping of lasers which was first studied in the early 1980s on neodymium doped and ytterbium doped lasers at low temperature. Since the 2000's, several research teams started to revisit the concept of LED pumped lasers: polymer laser, fiber laser and semiconductors have recently demonstrated laser effect under visible LED pumping. However, no experimental results were reported on LED pumped bulk crystals. In this paper, we demonstrated for the first time a LED pumped Nd:YVO4 laser operating at room temperature. We investigated two pumping wavelengths: in the amber around 600 nm and in the near infrared around 850 nm. The laser operated in quasi cw pumping regime to increase the LED intensity. We performed a two mirror cavity transversely pumped by 36 LEDs. Laser operation was achieved at room temperature for the both pump wavelengths: a maximum output energy of 40uJ for an emitted energy of 7.4 mJ with infrared pumping and an energy of 11.7 uJ for an emitted energy or 2.3 mJ with amber pumping. This works demonstrated that LED pumping has an interesting potential to realize ultra low cost solid state lasers operating in pulsed regime at kHz repetition rate and with energies in the mJ range.
author_names: Adrien Barbet

Hugo Grardel

Amandine Paul

Jean Blanchot

Francois Balembois

Frederic Druon

Patrick M Georges
title: LED side pumped Nd 3+ :YVO4 laser at room temperature (Orale)
year: 2015

abstract: The lighting market has recently improved LED performance by orders of magnitudes. In parallel, massive production decreases dramatically LED price. Those improvements triggered new interests for LED pumping of lasers which was first studied in the early 1980s on neodymium doped and ytterbium doped lasers at low temperature. Since the 2000's, several research teams started to revisit the concept of LED pumped lasers: polymer laser, fiber laser and semiconductors have recently demonstrated laser effect under visible LED pumping. However, no experimental results were reported on LED pumped bulk crystals. In this paper, we demonstrated for the first time a LED pumped Nd:YVO4 laser operating at room temperature. We investigated two pumping wavelengths: in the amber around 600 nm and in the near infrared around 850 nm. The laser operated in quasi cw pumping regime to increase the LED intensity. We performed a two mirror cavity transversely pumped by 36 LEDs. Laser operation was achieved at room temperature for the both pump wavelengths: a maximum output energy of 40mJ for an emitted energy of 7.4 mJ with infrared pumping and an energy of 11.7 mJ for an emitted energy or 2.3 mJ with amber pumping. This works demonstrated that LED pumping has an interesting potential to realize ultra low cost solid state lasers operating in pulsed regime at kHz repetition rate and with energies in the mJ range.
author_names: Adrien Barbet

Hugo Grardel

Amandine Paul

Jean Blanchot

Francois Balembois

Frederic Druon

Patrick M Georges
title: LED side pumped Nd3+:YVO4 laser at room temperature
venue: Photonics West Lasers and Applications in Science and Engineering
year: 2015

abstract: We present a Nd:YLiF4 diode side pumped resonator architecture based on a gain guided, mode selective technique that employs a double pass of the fundamental laser mode through the crystal. The folded cavity is very compact, robust and cost efficient. With this design we demonstrate 19 W of quasi cw, stable diffraction limited laser emission at 1053 nm when pumping at 792 nm with 35.4 W. The slope efficiency of the laser is 65.3% and the optical to optical efficiency is 53.6% which is, to the best of our knowledge, the highest efficiency reported for Nd:YLiF4 lasers pumped into the 4F5/2 band, including longitudinal pumping schemes and lasers emitting at the higher gain line of 1047 nm.
author_names: Niklaus Ursus Wetter

Alessandro Melo Deana
title: Diode side pumped Nd:YLiF4 laser emitting at 1053 nm with 53.6% optical efficiency and diffraction limited beam quality
year: 2013

abstract: Abstract This paper reports the performance studies of Nd:YAG rods with different diameters and doping concentration in the CW diode side pumped geometry. We have used p polarized diodes to pump the active medium and we studied the performance of different rods in terms of thermal lensing, its fluorescence profile, power output, and M 2 factor of the laser beam. We achieved a maximum of 378 W of output power for an input pump power of 757 W, which corresponds to optical conversion efficiency close to 50% The slope efficiency of the system was 56.4% These efficiencies are the highest reported to the best of our knowledge and we achieved with 4 mm x 100 mm Nd:YAG rod at 1.1 at% doping.
author_names: Raghav Sundar

Kannan Ranganathan

Ashish Kumar Nath
title: Performance studies of diode side pumped CW Nd:YAG laser in copper coated optical pump cavity
year: 2007

abstract: Operation of Nd:YAG slab laser side pumped by quasi continuous laser diode passively mode locked using semiconductor saturable absorber is reported. Trains with energy up to 2 mJ and pulse duration of 65 ps were generated.
author_names: Waldemar Zendzian

Jan Karol Jabczynski

Jacek Kwiatkowski

Vaclav Kubecek

Helena Jelinkova

A Stintz

Jean-Claude Diels
title: Quasi CW Laser Diode Side Pumped Nd:YAG Slab Laser Passively Mode locked Using Multiple Quantum Well Saturable Absorbers
venue: 2007 Conference on Lasers and Electro Optics (CLEO)
year: 2007

abstract: Highly efficient and high power continuous wave (CW) green beam generation by intracavity frequency doubling of diode side pumped Nd:YAG laser using a water cooled high gray track resistant potassium titanyl phosphate crystal is demonstrated in a Z shaped resonator design ensuring resonator stability over the entire range of the pump power with optimized spot sizes at the respective intracavity components configuration. A maximum of 82.5 W of CW green power was obtained at a total diode pumping power of 750 W, corresponding to 11% pump to green beam conversion efficiency. The green power increases linearly with pump power without any sign of power rolloff, and no damage of the crystal due to thermal lensing or gray tracking is observed. The long term stability is excellent with 0.7% variation in the output power. The short term rms intensity fluctuation is measured to be 0.2% The performance of the laser by considering the pump power induced thermal lensing effect and the M2 parameter at the fundamental wavelength has been analyzed. The theoretical model showed excellent agreement with the experimental results.
author_names: A J Singh

Pranab K Mukhopadhyay

Sunil K Sharma

Kannan Ranganathan

Shrikant M Oak
title: 82 W Continuous Wave Green Beam Generation by Intracavity Frequency Doubling of Diode Side Pumped Nd:YAG Laser
venue: IEEE Journal of Quantum Electronics
year: 2011

abstract: We report on the laser performance and power scaling properties of diode laser side pumped Nd:YAG rod lasers operating at high cw output powers. Applying a pump power of 1100 W cw in a ninefold pump geometry, we obtain an output power of more than 300 W in multimode operation. For a comparable pump scheme an output power of more than 45 W in TEM(00) mode operation is realized with an optical to optical efficiency of more than 11%
author_names: Dirk Golla

S Knoke

Wolfram Schone

G Ernst

Markus Bode

Andreas Tunnermann

Herbert Welling
title: 300 W cw diode laser side pumped Nd:YAG rod laser.
venue: Optics letters
year: 1995

abstract: In this paper we report on the characterization of a diode side pumped Nd:YAG rod laser operating at 300 W CW output power. The simulated and measured pump energy distributions in the crystal are compared. The thermal lens effect of the Nd:YAG have been experimentally investigated, and its influence on the performance of the laser are discussed. Output power and the beam quality of the laser under different resonator mirrors and rod end face curvatures have been experimentally studied. The optical to optical and electrical to optical efficiencies are 28.5% and 11% respectively. The beam parameter product is 40 mmmrad and the instability of laser is about 3%
author_names: Fereshteh Hajiesmaeilbaigi

H Razzaghi

M M Esfahani

M R A Moghaddam

Jamshid Sabbaghzadeh
title: Experimental study of a high power CW diode side pumped Nd:YAG rod laser
year: 2005

abstract: We describe the laser performance and thermal properties of side pumped Nd:YAG rod lasers that use ibercoupled diode lasers as pump sources. Utilizing a nearly homogeneous pump light profile, we realize an output power of more than 60 W in TEM(00) mode operation with optical to optical efficiencies of more than 25% In multimode operation, optical slope efficiencies of more than 46% are observed.
author_names: Dirk Golla

Markus Bode

S Knoke

Wolfram Schone

Andreas Tunnermann
title: 62 W cw TEM(00) Nd:YAG laser side pumped by fiber coupled diode lasers.
venue: Optics letters
year: 1996

abstract: This paper summarizes the results of simulation of a module for side pumping a Nd:YAG rod. The module consists of three laser diode arrays separated by 120deg rotation angle around the laser rod, where each array contains 10 emitters producing a maximum output power of 15 W at 808 nm wavelength. This high power diode pumped solid state (DPSS) laser system was modeled in both LASCAD and GLAD simulators. LASCAD model was used to simulate the laser output power as a function of the total input power and the output mirror reflectivity. The model predicted an output power of 140 W given 400 W total input pump power with optical efficiency of 35% in a good agreement with the published experimental results and similar commercially available CW DPSS laser systems. LASCAD was also used to model the temperature distribution inside the rod and to examine the heat load and thermally induced mechanical stress on the rod. Simulation in GLAD enabled a detailed analysis of the beam quality, beam size, and mode stability inside the resonator. GLAD models were used to simulate the pumping light distribution in the Nd:YAG rod for a single diode element, a single diode array, and three diode arrays. The GLAD shows that a stable multi transverse mode "top hat" beam is formed after 30 passes through the resonator of the adopted high power DPSS laser system.
author_names: Tamer M Kashef

Ayman Mokhtar

Samy Ghoniemy

Lawrence Shah

Martin C Richardson
title: Analysis and modeling of a high power side diode pumped solid state laser system
venue: Defense Security Symposium
year: 2015