Chinese Journal of Lasers, Volume. 46, Issue 12, 1200001(2019)
Fundamentals of Ultrashort Pulse Laser and Its Applications
Figures & Tables(7)
Fig. 1. Normalized electric-field strength (dashed curve) and transient intensity (solid curve) of 15-fs chirp-free Gaussian laser pulse with central wavelength of 800 nm
Fig. 2. Relationship between time- and frequency-domains of ultrashort laser pulses. Two domains form Fourier transform pairs
Fig. 11. Approximate selection guide of wavelength and pulse duration in USP laser machining
Fig. 12. Effect of pulse energy on actual ablation pulse duration (dotted line represents ablation threshold)
Table 1. Common technical parameters of ultrashort pulse laser
View tableTable 1. Common technical parameters of ultrashort pulse laser
Laser parameter [Unit], common unit Relation Central wavelength, λ [m], nm, μm Pulse duration, Δt [s], ps, fs Average power, P [W], mW, W, kW Pulse repetition rate, F [Hz], kHz, MHz Also known as PRR Basic parameters Bandwidth, Δλ(or spectral width, Δν) [m], nm, μm Δν=Δλ×(c/λ2) [Hz] Polarization ratio, PR (unitless) Radius of laser beam, w [m], mm, μm Laser beam circularity, C (unitless) wx/wy≤100% Beam divergence, θ [rad], rad, mrad Beam quality factor, M2 (unitless) M2=θ/(λ/πw)(≥1) Pulse energy, ΔE [J], μJ, nJ ΔE=P/F Peak power, P [W], kW, MW P=ΔE/Δt Derived parameters Pulse period, T [s], ns T=1/F Area of laser beam cross section, A [m]2, cm2 A=πw2 Energy fluence, F [J]/[m]2, J/cm2 F=2×ΔE/A Peak intensity, I [W]/[m]2, W/cm2 I=p/A=F/Δt Time bandwidth product, TBP (unitless) TBP=Δt×Δν Quality parameters Beam parameter product, BPP [m][rad], mm mrad BPP=w×θ=(λ/π)×M2 Pulse stability (unitless), (p-p%) rms Beam pointing [rad] /[℃], rad/℃
Table 2. Comparison of major technical specifications of some USP laser products for industrial applications at home and abroad
View tableTable 2. Comparison of major technical specifications of some USP laser products for industrial applications at home and abroad
Laser Item Trumpf Coherent SP PI Huaray Bellin Huakuai YSL Picosecond infrared laser Model TruMicro 5070 HyperRapid NX 1064-50 IceFyre 1064-50 RGH- 1064-48 Olive -1064-50 Amber IR YPP-IR-30 PicoYL-100 -100-100 Wavelength /nm 1030 1064 1064 1064 1064 1064 1064 1030 Average power /W 100 50 50 @400 kHz 48 @400 kHz 50 @500 kHz 75 @1MHz 30 @100 kHz 100 Pulse energy /μJ 250 220 @200 kHz 200 @200 kHz 420 @100 kHz 200 @200 kHz 250 @300 kHz 200 @100 kHz 100 @100 ps Repetition rate /kHz 400-1000 200-1000 0.001-10000 100-2000 0.001-1000 0.001-1000 100-1000 100-1000 Pulse duration /ps <10 <15 <15 ~10 <10 <15 <15 100-500 RMS of pulse energy stability N/A <1% <1.5% <2% ≤1% <3% <2% <2% Pulse selection N/A √ √ √ √ √ √ √ M2 <1.3 ≤1.3 <1.3 ≤1.3 ≤1.3 <1.3 <1.3 <1.3 Polarization ratio N/A >100∶1 >100∶1 >100∶1 >100∶1 >100∶1 >100∶1 N/A Femtosecond infrared laser Model TruMico 5070 Femto Edition Monaco 1035-80-40 Spirit 1030-100 HR-Femto- IR-50-40 Axinite IR-20 YPF-IR-20 Femto YLTM-100 Wavelength /nm 1030 1035±5 1030±5 1035 1030 1030 030 Average power /W 80 40 @500 kHz 100 @1 MHz 40 @1 MHz 20 @1 MHz 20 100 Pulse energy /μJ 200 80 @500 kHz 100 @1 MHz 40 @1 MHz 30 @500 kHz 50 200 Repetition rate /kHz 400-1000 0.001-1000 0.001-10000 100-5000 0.001-1000 50-500 25-5000 Pulse duration /ps <900 <350 <400 <350 <500 <500 ~400 RMS of pulse energy stability N/A 1.5% 2% <2% <3% <3% <2% Pulse selection N/A N/A N/A N/A √ √ √ M2 <1.3 <1.2 <1.2 ≤1.3 <1.3 <1.3 <1.3 Polarization ratio N/A >100∶1 >100∶1 >100∶1 >100∶1 >100∶1 N/A Picosecond green laser Model TruMicro 5270 Hyper Rapid NX 532-25 RGH- 532-20 Olive- 532-15 Amber GR YPP- GN-20 PicoYL- Green Wavelength /nm 515 532 532 532 532 532 515 Average power /W 60 25 @200 kHz 20 @100 kHz 15 @500 kHz 45 @500 kHz 20 @500 kHz 30 Pulse energy /μJ 150 125 @200 kHz 200 @100 kHz 100 @100 kHz 90 @500 kHz 40 @500 kHz 40 Repetition rate /kHz 400-1000 200-1000 100-2000 0.001-1000 0.001-1000 400-1000 300-2500 Pulse duration /ps <10 <15 ~7 <10 <15 <15 800 RMS of pulse energy stability N/A <2% <2% ≤1.5% <3% <2% <2% Pulse selection N/A √ √ √ √ √ √ M2 <1.3 ≤1.3 ≤1.3 ≤1.2 <1.3 <1.3 <1.3 Polarization Ratio N/A >100∶1 >100∶1 >100∶1 >100∶1 >100∶1 N/A Picosecond UV laser Model TruMicro 5370 HyperRapid NX 355-15 IceFyre 355-30 RGH- 355-12 Olive- 355-10 Amber UV YPP- UV-10 PicoYL-UV Wavelength /nm 343 355 355 355 355 355 355 343 Average power /W 30 15 30 @500 kHz 12 @100 kHz 10 @500 kHz 30 @700 kHz 15 15 Pulse energy /μJ 75 75 @200 kHz 60 @500 kHz 120 @100 kHz 60 @100 kHz 42 @700 kHz 30 @500 kHz 30 Repetition rate /kHz 400-1000 200-1000 0.001-3000 100-2000 0.001-1000 0.001-1000 400-1000 300-1200 Pulse duration /ps <10 <15 <15 ~7 <10 <15 <15 800 RMS of pulse energy stability N/A <2% <2% <3% ≤1.5% <3% <5% <2% Pulse selection N/A √ √ √ √ √ √ √ M2 <1.3 ≤1.3 <1.3 ≤1.3 ≤1.2 <1.3 <1.3 <1.3 Polarization ratio N/A >100∶1 >100∶1 >100∶1 >100∶1 >100∶1 >100∶1 N/A
Tools
Get Citation
Copy Citation Text
Xiaonong Zhu, Wenxia Bao. Fundamentals of Ultrashort Pulse Laser and Its Applications[J]. Chinese Journal of Lasers, 2019, 46(12): 1200001
Paper Information
Category: reviews
Received: May. 7, 2019
Accepted: Aug. 2, 2019
Published Online: Dec. 2, 2019
The Author Email: Zhu Xiaonong (zhu@advaluephotonics.com)
© Copyright 2018-2021 | Chinese Laser Press.
All Rights Reserved 沪ICP备15018463号-20