Effect of absorbed pump power on the quality of output beam from monolithic microchip lasers

Mukhopadhyay, P. K.; Ranganathan, K.; George, J.; Sharma, Sunil; Nathan, T. P. S.

doi:10.1007/s12043-002-0023-6

Cited by 7 publications

(3 citation statements)

References 16 publications

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“…In the context of classical laser concepts, an increase in the output power might occur together with a decrease in the beam quality (an increase of M 2 ), and therefore, the brightness does not scale trivially. Typically, it decreases with an increase in the pump as observed for microchip solid-state lasers [4,5] and semiconductor systems [6,7]. This is because it exceeds the generation threshold for higher-transverse modes characterized by higher divergence [8,9].…”

Section: Introductionmentioning

confidence: 98%

Spatially Structured Optical Pump for Laser Generation Tuning

Kontenis,

Gailevicius,

Taranenko

et al. 2023

Preprint

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The main goal and essential parameter of laser light conversion is achieving higher laser brightness. That is the main reason why we take one light source to pump another. For every application the desired laser beam must have the highest available beam quality and highest achievable power. Usually by increasing one parameter, you incur a loss in the other. Here we present a method for delaying the reduction in beam quality by using a spatially structured optical pump for a membrane external cavity laser resonator. A slight increase in brightness is achieved under the same focusing conditions just by changing the pump intensity profile. By using a dynamically changing pump pattern a controllable output laser mode can be achieved.

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Section: Introductionmentioning

confidence: 98%

Spatially Structured Optical Pump for Laser Generation Tuning

Kontenis,

Gailevicius,

Taranenko

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…In the context of classical laser concepts, an increase in the output power might occur together with a decrease in the beam quality (an increase of

), and therefore, the brightness does not scale trivially. Typically, it decreases with an increase in the pump as observed for microchip solid-state lasers [ 4 , 5 ] and semiconductor systems [ 6 , 7 ]. This is because it exceeds the generation threshold for higher-transverse modes characterized by higher divergence [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Spatially Structured Optical Pump for Laser Generation Tuning

Kontenis,

Gailevicius,

Taranenko

et al. 2023

Nanomaterials

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The goal and essential parameter of laser light conversion is achieving emitted radiation of higher brightness. For many applications, the laser beam must have the highest available beam quality and highest achievable power. However, lasers with higher average power values usually have poorer beam quality, limiting the achievable brightness. Here, we present a method for improving the beam quality by using a spatially structured optical pump for a membrane external cavity laser resonator. An increase in brightness is achieved under fixed focusing conditions just by changing the pump intensity profile. A controllable output laser mode can be achieved by using a dynamically changing pump pattern.

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“…Mukhopadhay et al have theoretically investigated the effect of absorbed pump power on the quality of output beam for a facecooled monolithic laser. 35 They have considered the effect of change in mode volume as well as the spherical aberration associated with the thermal lens as a function of the absorbed pump power which causes the degradation of the output beam quality from Nd 3+ doped GdVO 4 monolithic lasers. 35 Sudheer et al have reported characterization of solid-state laser sources for light detection and ranging as well as free space communication applications.…”

Section: Introductionmentioning

confidence: 99%

High data rate laser transmitter based on a diode double end-pumped Nd:YAG laser with linearly polarized output for free space laser communication

et al. 2008

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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 4 F 3/2 → 4 I 11/2 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: YVO 4 laser. All the results indicate that the laser beam characteristics are useful for high data rate free space laser communication links.

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Effect of absorbed pump power on the quality of output beam from monolithic microchip lasers

Cited by 7 publications

References 16 publications

Spatially Structured Optical Pump for Laser Generation Tuning

Spatially Structured Optical Pump for Laser Generation Tuning

Spatially Structured Optical Pump for Laser Generation Tuning

High data rate laser transmitter based on a diode double end-pumped Nd:YAG laser with linearly polarized output for free space laser communication

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