Microdrilling and micromachining with diode-pumped solid-state lasers

Otani, Takeyoshi; Herbst, Ludolf; Heglin, Michael; Govorkov, Sergei V.; Wiessner, A.

doi:10.1007/s00339-004-2766-z

Cited by 45 publications

(23 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…CW and pulsed DPSSLs are used for industrial applications in material processing, laser drilling, cutting and welding of metal sheets. 23,24) DPSSLs are also highly demanded for applications requiring small pulse energy or low average power. The unique compactness, efficiency and reliability of cw and pulsed DPSSL light sources of milliwatt power or millijoule energy levels are valuable for optical communications, control systems, metrology, micromachining, medical applications, etc.…”

Section: Introductionmentioning

confidence: 99%

“…62,76) The vector doughnuts have been successfully used for particle trapping, 77,78) high resolution metrology, 79) material processing. 23,24) RP and AP doughnuts and highorder LG vector modes have been actively studied for their capability to generate a strong longitudinal electric field when it is tightly focused and a focal spot smaller than that for a linearly polarized beam. 72,74,76) Methods of cv modes selection in a laser are distinguished usually by the usage of axisymmetric-polarization-selective components: birefringent crystals, 57,66,70,71) Brewster angle conical elements, 58,65) polarization selective mirrors.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Laguerre-Gaussian modes selection in diode-pumped solid-state lasers

Senatsky

Bisson

et al. 2012

OPT REV

View full text Add to dashboard Cite

Over the last twenty years, diode pumping of solid-state lasers has opened new prospects for the mode control and formation of Laguerre-Gaussian (LG) beams, enabling a large variety of applications. Experiments on scalar and vector LG modes selection in Nd 3þ -and Yb 3þ -doped ceramics and crystal lasers carried out at the Institute for Laser Science, Tokyo are reviewed. Selection of LG modes from low to high orders using intra-cavity elements, polarization-selective mirrors, or shaping the pump beam profile, is considered. Illustrations of record-high-order LG hollow modes, multiring modes with highly directional propagation properties, characteristics of cw and pulsed lasers with radially or azimuthally polarized beams of high polarization purity are presented. General solutions of the wave equation for the axi-symmetric electric field, which describe LG beams of various profiles, are proposed for data analysis. In parallel, a short review on LG modes selection studies carried out at other laboratories is given.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laguerre-Gaussian modes selection in diode-pumped solid-state lasers

Senatsky

Bisson

et al. 2012

OPT REV

View full text Add to dashboard Cite

show abstract

“…Thanks to the ultra-short timescale on which laser energy is coupled to the material, high precision sub-micron machining of metals has been achieved with very little thermal damage [1,2]. Industrial applications include the very precise drilling of holes for fuel-injection nozzles in the automotive industry [2,3]. The key parameters influencing the laser-machining process quality are the pulse duration, wavelength, peak power, beam quality and polarization [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Real-time control of polarization in ultra-short pulse laser micro-processing

Allegre¹,

Perrie²,

Bauchert³

et al. 2010

Proceedings of the 36th International MATADOR Conference

View full text Add to dashboard Cite

Abstract. The use of a fast-response, transmissive, ferroelectric liquid-crystal device for real-time control of the polarization direction of a femtosecond laser beam, and the benefits on various aspects of ultra-short pulse micro-processing, are discussed. Several configurations have been used for driving the polarization in realtime. Following successful testing of these applications, real-time polarization control has emerged as a flexible toolbox for the laser processing engineer. Microscopic investigation of the produced features revealed the significant improvement in process quality.

show abstract

“…For some of them such as silicon, glass, sapphire, the ultraviolet lasers (UV) were developed in order to increase the material absorption [1,2]. While UV lasers around 350 nm obtained by third harmonic generation (THG) are now commonly used in material processing, deep-UV lasers obtained by fourth harmonic generation (FHG) around 260 nm are still challenging to realize.…”

Section: Introductionmentioning

confidence: 99%

Impact of BaB2O4 growth method on frequency conversion to the deep ultra-violet

Deyra

Maillard

et al. 2015

Solid State Sciences

View full text Add to dashboard Cite

To cite this version:Loic Deyra, Alain Maillard, R Maillard, D Sangla, F Salin, et al.. Impact of BaB 2 O 4 growth method on frequency conversion to the deep ultra-violet. Solid State Sciences, Elsevier, 2015, 50, pp.97-100. 10 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Czochralski and TSSG β-BBO crystals are compared for high power UV (266nm) in second harmonic generation. Impurities from flux decrease the efficiency of harmonic generation at high power (40%). Corresponding author : A Maillard, alain.maillard@univ-lorraine.fr M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT Impact of BaBAbstract: In this article, we report how the growth method used for barium beta-borate β−BaB2O4 (BBO) impacts its high power second harmonic generation properties in the deep-UV. We compared a BBO crystal grown by flux (Top Seeded Solution Growth or TSSG) and a BBO crystal grown by the Czochralski (CZ) method. We first characterized their transparency properties, then we measured their single-pass second harmonic conversion efficiencies with both a low average power and a high average power nanosecond pulsed lasers. We show that both crystals have comparable linear absorption and conversion efficiencies at low power, whereas in a high power experiment, the CZ-grown BBO yields higher conversion efficiency than the TSSG grown BBO. With a 30 W, 150 kHz, 8ns green laser, the use of a CZ BBO led at best to a 40% increase in available average output power at 257 nm.Keywords: Borates, Nonlinear optical, Czochralski growth, Solution growth, Second harmonic generation. IntroductionThe material machining industry has continuously looked to process more and more types of materials efficiently. For some of them such as silicon, glass, sapphire, the ultraviolet lasers (UV) were developed in order to increase the material absorption [1,2]. While UV lasers around 350 nm obtained by third harmonic generation (THG) are now commonly used in material processing, deep-UV lasers obtained by fourth harmonic generation (FHG) around 260 nm are still challenging to realize. The nonlinear material quality is a key parameter in order to reach high and stable conversion efficiency by reducing thermal dephasing and degradation effects. Beta-barium borate β-BaB2O4 (BBO) is a nonlinear crystal that has good properties for frequency conversion to the UV, such as a high nonlinearity or a short cut-off wavelength in the UV around 190nm [3]. It is available commercially, and is usually grown by top-seeded solution growth (TSSG) assisted with either a Na2O or NaF flux [4]. BBO can be also grown without flux by the Czochralski (CZ) method, but...

show abstract

Microdrilling and micromachining with diode-pumped solid-state lasers

Cited by 45 publications

References 1 publication

Laguerre-Gaussian modes selection in diode-pumped solid-state lasers

Laguerre-Gaussian modes selection in diode-pumped solid-state lasers

Real-time control of polarization in ultra-short pulse laser micro-processing

Impact of BaB2O4 growth method on frequency conversion to the deep ultra-violet

Contact Info

Product

Resources

About