Journal ArticleDOI
High data rate laser transmitter based on a diode double end-pumped Nd:YAG laser with linearly polarized output for free space laser communication
S. K. Sudheer,S. Sivabalan,N. Venugopalan Pillai,V.P. Mahadevan Pillai,Zachariah C. Alex,V.U. Nayar,J. P. Raina +6 more
TLDR
In this paper, a diode double end-pumped Nd:YAG laser was designed and fabricated for free space laser communication and the laser beam parameters were characterized for the same application.Abstract:
Optically pumped solid-state lasers with Nd:YAG may have to operate over a wide range of temperatures. We designed and fabricated a diode double end-pumped Nd:YAG laser for free space laser communication. Various laser beam parameters have been characterized for the same application. The temperature dependence of the effective stimulated emission cross section for 4F3/24I11/2 transition and fractional thermal loading of Nd:YAG are determined using a planar resonator with two collimated and focused pump beams from fiber-array package laser diodes at 808 nm. The pump power-induced thermal lensing is used to stabilize the cavity. The diode double end-pumped Nd:YAG laser possesses an extremely good beam profile that exactly matches the theoretical Gaussian intensity distribution up to a diode current of 30 A. After that the ellipticity slightly increases, indicating deviation from the circular symmetry of beam, which may be due to the thermally induced birefringence of the Nd:YAG crystal offered to the polarized laser beam. The thermal lens focal length decreases with an increase in the absorbed pump power, similar to the case of a lamp pumped Nd:YAG laser and a diode pumped Nd:YVO4 laser. All the results indicate that the laser beam characteristics are useful for high data rate free space laser communication links.read more
Citations
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Journal ArticleDOI
Demonstration of a free-space optical communication system using a solar-pumped laser as signal transmitter
TL;DR: In this paper, a free-space optical communication system with a sun light directly pumped laser as the signal transmitter was demonstrated, where the output intensity was modulated with a video signal via a LiNbO3 Mach-Zehnder optoelectronic modulator.
Proceedings ArticleDOI
How to harvest efficient laser from solar light
TL;DR: In order to increase the output power and improve the efficiency of SPSSL, the authors in this article conducted intensive studies on the suitable laser material selection for solar pump, high efficiency/large aperture focusing optical system, the optimization of concave cavity as the second focusing system, laser material bonding and surface processing.
Journal ArticleDOI
145-watt high beam quality bidirectional voltage-supplied Q-switched Nd∶YAG master oscillator power amplifier laser
TL;DR: In this paper, a high compact structure laser diode (LD) side-pumped all-solid-state Q-switched master oscillator power amplifier (MOPA) laser system with high beam quality was presented.
Journal ArticleDOI
Growth, spectroscopy and high-power laser operation of Er:YAP crystal with different Er3+ concentrations
Cong Quan,Dunlu Sun,Huili Zhang,Jianqiao Luo,Lunzhen Hu,Zhiyuan Han,Yang Qiao,Kunpeng Dong,Yuwei Chen,Maojie Cheng +9 more
TL;DR: The 15 at% Er:YAP crystal has strongest mid-infrared fluorescence intensity and best laser performance by 968-nm LD side-pumping as mentioned in this paper , achieving maximum average powers of 23.52 and 11.08 W at 250 and 1000 Hz, corresponding to the slope efficiency of 12.0% and 6.2%, respectively.
Journal ArticleDOI
Receiver power penalty due to localized distortion induced by transmission-type optical antenna in inter-satellite laser communications
TL;DR: Based on a truncated ellipse Gaussian model for localized distortion in transmission-type optical antenna, the receiver power penalty due to localized wavefront deformation is researched in this paper.
References
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Journal ArticleDOI
Stimulated-emission cross section and fluorescent quantum efficiency of Nd 3+ in yttrium aluminum garnet at room temperature
TL;DR: In this article, the stimulated-emission cross sections and fluorescence branching ratios for the principal fluorescence transitions of YAG:Nd emanating from the $^{4}F_{\frac{3}{2}}$ state have been measured at room temperature.
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Journal ArticleDOI
Scaling CW diode-end-pumped Nd:YAG lasers to high average powers
TL;DR: In this article, the scaling limits of diode-end-pumped Nd:YAG laser are analyzed by pumping geometry, thermal distortion, birefringence, and fracture.
Journal ArticleDOI
Thermal beam distortions in end-pumped Nd:YAG, Nd:GSGG, and Nd:YLF rods
TL;DR: In this paper, the authors analyzed the thermally induced beam distortions in end-pumped Nd:YAG, nd:GSGG, and nd :YLF rods and calculated the distribution of temperature, stress, and strain in the crystals by finite element analysis.
Journal ArticleDOI
Optimization in scaling fiber-coupled laser-diode end-pumped lasers to higher power: influence of thermal effect
TL;DR: In this paper, the optimal mode-to-pump ratio in scaling fiber-coupled laser-diode end-pumped lasers to higher power has been investigated by including the thermal effect into the space-dependent rate equation analysis.