Selective thin film structuring with laser beams was already being deployed in industries such as
the display industry and the photovoltaic industry. However developments in tailored
performances of laser beams, such as spatial profile, temporal behaviour and wavelength will
improve the resource efficiency and reduce the production cost and this in turn will make more
applications accessible. For optimizing selective thin film structuring different wavelengths were
used. In this paper the results will be presented and discussed.
INNOSLAB lasers are characterized by: short pulse length and high peak power, high pulse
repetition rate, high beam quality and flexibility in beam profile, from circular beam profile, through
line shaped one dimensional Top-hat, to two dimensional top-hat with rectangular or square cross
section. Their tailor able beam profiles open for INNOSLAB laser a variety of applications with high
energy efficiency, such as glass milling, parallel scribing, high throughput ablation, particle imaging
velocimetry and pumping of dye lasers.
Through an optimal combination of crystal shape, cooling and resonator design, InnoSlab lasers
possess unified advantageous features of short pulse duration and high peak output power, high
pulse repetition rate, high beam quality and high flexibility in beam profile, from circular beam
profile, through line shaped one dimensional Top-hat, to two dimensional Top-hat with rectangular
cross section. We report diode end pumped, electrooptically q-switched Nd:YLF, Nd:YAG and
Nd:YVO4 slab laser and their efficient harmonic generation in near field. Using oscillator/amplifier
with Nd:YAG slabs over 50mJ pulse energy at 6kHz was obtained. The pulse length is 7ns and the
peak power is as high as 7MW. With Nd:YVO4 slabs 400W average power at 50kHz was obtained.
The pulse length is as short as 8ns. Because of the high peak power over 300W second harmonic
is achieved by two LBO crystals.
We reported all-solid-state double Nd:YLF and Nd:YAG slab laser and their efficient frequency
doubling in near field. With two Nd:YLF slabs fundamental laser pulse energy of 24 mJ and 15mJ
pulse energy at 523 nm were obtained at a 1.0 kHz repetition rate. The pulse length at 1047nm and
523 nm was 7.1ns and 5.5 ns. The peak power is around 3MW. The corresponding conversion
efficiency was 62.3%. With two Nd:YAG slabs average q-switched fundamental output of 169 W at 10
KHz was obtained. 93 W of second harmonic at 10 KHz with a pulse width of 10.7 ns was achieved.
The efficiency of SHG was up to 57%.
In this talk we will present a novel glass processing technique using q-swicthed INNOSLAB lasers.
The mJ laser beam of some ns pulse length and beam quality of M2 < 1,3 from INNOSLAB laser is
focused into the glass to a very small spot. Because of the nonlinear absorption at high intensity
the laser energy is absorbed near the focus. This leads to micro cracks inside glass or localized
ablation, if the focus is on the glass surface. Using this mechanism glass can be proceeded at high
precision and speed.
An efficient second harmonic generation of diode end-pumped electro-optical q-switched Nd:YVO4 slab laser is demonstrated. A maximum output power of 15.6W at 532nm was obtained at a repetition rate of 40kHz, the corresponding conversion efficiency was 60% and the pulse width was 11.3ns. At a repetition rate of 10kHz, the pulse energy of 532nm was 1.2mJ and the pulse width was as short as 5ns. The beam quality was M2 < 1,3.
Using a slab shaped laser media can effectively reduce thermally induced strain and aberration. In this paper we report the experimental results obtained using an end pumped Nd:YVO4 slab laser with a hybrid resonator. With this design we measured 110W output with the beam quality of 1.3 and 1.5 in two orthonormal directions.