Diode end pumped Nd:YAG laser at 946 nm with high pulse energy limited by thermal lensing

Thermal lens analysis in a diode-pumped 10 Hz 100 mJ Yb:YAG amplifier

“…where η s is the fraction of power dissipated as heat (normally associated with the quantum defect 1 − λ p /λ l , where λ p and λ l are the pump and lasing wavelengths, respectively), w p is the pumping waist size inside the gain medium, γ is the absorption coefficient and P(t) accounts for the pump temporal profile. The boundary conditions for such a geometry have been intensively studied in previous works [11,24,28] . In the general case, Newton's law of heat transfer governs the boundary conditions.…”

“…There has been a significant volume of both theoretical and experimental work toward describing and characterizing the thermal lens effect. Some models have aimed at obtaining a general analytical expression for the focal length, making use of the average power and discarding the time evolution of the temperature [8][9][10] , while others have provided a more complete description of the pulsed heat deposition [11][12][13][14][15] .…”

AOM fourfold pass for efficient Q-switching and stable high peak power laser pulses

“…Particularly Nd:YAG lasers emitting in the near infrared around 1 lm are widespread and powerful laser sources [2,3]. Although diode pumping meanwhile is well established due to its efficient excitation, and lead to high power laser systems with excellent beam quality [4,5], the traditional transversely lamp pumped and water cooled Nd:YAG rod laser still has a big importance, because of its technological simplicity and robustness [6][7][8].…”

Heat Generation and Removal in Solid State Lasers

“…No absorption inside the caps takes place and therefore, they can show important role in axial heat transfer from end surfaces. Numerical calculations of temperature distribution in composite laser rod can be found in [45] In the case of pulsed pumping laser rod, interesting numerical analysis has been done by Wang published in [46]. In this work the laser rod is surrounded by a cylindrical heat sink which leads to conductive heat transfer from rod surface to the ambient medium.…”

“…Figure 8.b tries to simply specify the P(t). Detailed information of solving the transient heat differential equation can be found in [46]. Figure 9 shows the temperature distribution inside a Nd:YAG laser rod exposing to the pump beam with pulse duration of 300μs, and repetition frequency of 50 Hz.…”