Influence of the time profile of a laser pulse on the thickness of a laser–hardened layer

Gureev, D. M.

doi:10.1070/qe1986v016n08abeh007354

Cited by 1 publication

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is confirmed by the conclusion of [10] that, in solving technical problems associated with the melting and evaporation of a material, the action by triangular pulses with a low-angle leading edge and a steep trailing edge is the most efficient from the viewpoint of the minimum energy consumption.…”

Section: Influence Of the Time Form Of A Laser Pulse On The Thicknesssupporting

confidence: 82%

See 1 more Smart Citation

Approximation of the time form of a laser pulse using finite functions

Evtushenko

2006

J Eng Phys Thermophys

View full text Add to dashboard Cite

The influence of the time form of a surface heat source on the distribution of the temperature field in a homogeneous half-space is investigated.Introduction. The intensity of laser radiation is either constant (continuous operation) or a function of time (pulsed operation) [1]. Most gas lasers, in particular, CO 2 and He-Ne ones, can operate in both continuous and pulsed lasing regimes. Solid-state lasers (ruby, neodymium glass, and Nd:YAG ones) are used in a pulsed regime, although the latter can operate continuously, too. The function describing the time variation in the specific laser-radiation power is called the time form (structure) of a laser beam. The time structure of a pulse of modern lasers can vary with operating conditions (e.g., ruby and neodymium lasers).We have a millisecond (normal) lasing regime when the laser is pumped using a flash lamp. The pulse duration typical of this operating regime of the laser takes on values in the interval 0.1-1 msec. Usually, such a pulse consists, in turn, of a series of randomly occurring flashes with a duration of about a few microseconds. The amplitude and time intervals between them are different. Ruby and neodymium glass lasers frequently operate in such a regime. In a millisecond regime of laser operation, we can also have the generation of a quasistationary pulse, when microflashes are absent. A typical oscillogram of variation in the specific power of a neodymium glass laser operating in a millisecond regime is shown in Fig. 1 [2].Heat-Conduction Problem. The depth of penetration of laser light into the irradiated material is much smaller than the thickness of a layer heated by heat conduction. It is well known that if the thickness of the heated layer is much smaller than the radius of the laser beam, the process of heating of a body can be modeled using a surface heat source [1]. In selecting laser-radiation parameters necessary for forming the temperature field of a certain (for this depth) level in a material with prescribed thermophysical properties, one uses, as a rule, the solution of a one-dimensional (in space coordinate) linear heat-conduction equation for a semiinfinite body z ≥ 0 [3]:

show abstract

Section: Influence Of the Time Form Of A Laser Pulse On The Thicknesssupporting

confidence: 82%

“…4. The interior of the body is cooled most rapidly for the rectangular form of a pulse, and the cooling is the slowest for the intensity distribution (10). The temperature becomes negligibly low at a distance of about three radii of the heat source for all three time structures.…”

mentioning

confidence: 99%

Approximation of the time form of a laser pulse using finite functions

Evtushenko

2006

J Eng Phys Thermophys

View full text Add to dashboard Cite

show abstract

Influence of the time profile of a laser pulse on the thickness of a laser–hardened layer

Cited by 1 publication

References 3 publications

Approximation of the time form of a laser pulse using finite functions

Approximation of the time form of a laser pulse using finite functions

Contact Info

Product

Resources

About