Influence of pulse-tail energy of short-pulse CO2 laser in drilling of various glasses
Abstract In a short-pulse CO2 laser based on discharge excitation, there is a pulse tail that depends on the device configuration and operating conditions. The pulse tail is longer than the spike pulse and causes thermal effects such as a crack, heat-affected zones (HAZ), and so on. There are variou...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2023-11-01
|
| Series: | Journal of Engineering and Applied Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s44147-023-00311-8 |
| _version_ | 1797559412592738304 |
|---|---|
| author | Kazuyuki Uno Yasushi Kodama Kazuyuki Yoneya |
| author_facet | Kazuyuki Uno Yasushi Kodama Kazuyuki Yoneya |
| author_sort | Kazuyuki Uno |
| collection | DOAJ |
| description | Abstract In a short-pulse CO2 laser based on discharge excitation, there is a pulse tail that depends on the device configuration and operating conditions. The pulse tail is longer than the spike pulse and causes thermal effects such as a crack, heat-affected zones (HAZ), and so on. There are various types of glass having different physical constants related to heat, such as the thermal expansion coefficient and the softening point. Even if the same CO2 laser pulse is radiated onto glass, the processing results may differ depending on the glass material. Four types of glass, namely, crown glass, soda-lime glass, borosilicate glass, and synthetic quartz glass were irradiated with two types of short CO2 laser pulses, one with a large pulse tail and one with a small pulse tail, at a repetition rate of 200 Hz and a fluence per pulse of 22 J/cm2. As the processing characteristics, the ratios of the surface hole diameter and the HAZ diameter to the irradiation diameter, as well as the drilling depth, were investigated. The pulse-tail energy of the short CO2 laser pulses did not affect the surface hole diameter. In the glasses with small softening points of 740 °C or less, the pulse-tail energy of short CO2 laser pulses affected the HAZ with a large number of pulse irradiations with a total irradiation fluence of 2000 J/cm2 or more. The short CO2 laser pulses with a small tail produced a smaller HAZ than the short CO2 laser pulses with a large tail. In drilling with a large number of pulse irradiations, the short CO2 laser pulses with a small tail produced deeper drilling than the short CO2 laser pulses with a large tail. The glass material did not affect the surface hole diameter and the drilling depth. The glass material affected the HAZ. |
| first_indexed | 2024-03-10T17:45:00Z |
| format | Article |
| id | doaj.art-90f2730fdbfc439fb6678f1563ebd85a |
| institution | Directory Open Access Journal |
| issn | 1110-1903 2536-9512 |
| language | English |
| last_indexed | 2024-03-10T17:45:00Z |
| publishDate | 2023-11-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of Engineering and Applied Science |
| spelling | doaj.art-90f2730fdbfc439fb6678f1563ebd85a2023-11-20T09:33:23ZengSpringerOpenJournal of Engineering and Applied Science1110-19032536-95122023-11-017011810.1186/s44147-023-00311-8Influence of pulse-tail energy of short-pulse CO2 laser in drilling of various glassesKazuyuki Uno0Yasushi Kodama1Kazuyuki Yoneya2Integrated Graduate School of Medicine, Engineering, and Agricultural Sciences, University of YamanashiIntegrated Graduate School of Medicine, Engineering, and Agricultural Sciences, University of YamanashiSeidensha Electronics Co., Ltd. of JapanAbstract In a short-pulse CO2 laser based on discharge excitation, there is a pulse tail that depends on the device configuration and operating conditions. The pulse tail is longer than the spike pulse and causes thermal effects such as a crack, heat-affected zones (HAZ), and so on. There are various types of glass having different physical constants related to heat, such as the thermal expansion coefficient and the softening point. Even if the same CO2 laser pulse is radiated onto glass, the processing results may differ depending on the glass material. Four types of glass, namely, crown glass, soda-lime glass, borosilicate glass, and synthetic quartz glass were irradiated with two types of short CO2 laser pulses, one with a large pulse tail and one with a small pulse tail, at a repetition rate of 200 Hz and a fluence per pulse of 22 J/cm2. As the processing characteristics, the ratios of the surface hole diameter and the HAZ diameter to the irradiation diameter, as well as the drilling depth, were investigated. The pulse-tail energy of the short CO2 laser pulses did not affect the surface hole diameter. In the glasses with small softening points of 740 °C or less, the pulse-tail energy of short CO2 laser pulses affected the HAZ with a large number of pulse irradiations with a total irradiation fluence of 2000 J/cm2 or more. The short CO2 laser pulses with a small tail produced a smaller HAZ than the short CO2 laser pulses with a large tail. In drilling with a large number of pulse irradiations, the short CO2 laser pulses with a small tail produced deeper drilling than the short CO2 laser pulses with a large tail. The glass material did not affect the surface hole diameter and the drilling depth. The glass material affected the HAZ.https://doi.org/10.1186/s44147-023-00311-8CO2 laserLaser drillingGlassThermal expansion coefficientSoftening pointCrack-less |
| spellingShingle | Kazuyuki Uno Yasushi Kodama Kazuyuki Yoneya Influence of pulse-tail energy of short-pulse CO2 laser in drilling of various glasses Journal of Engineering and Applied Science CO2 laser Laser drilling Glass Thermal expansion coefficient Softening point Crack-less |
| title | Influence of pulse-tail energy of short-pulse CO2 laser in drilling of various glasses |
| title_full | Influence of pulse-tail energy of short-pulse CO2 laser in drilling of various glasses |
| title_fullStr | Influence of pulse-tail energy of short-pulse CO2 laser in drilling of various glasses |
| title_full_unstemmed | Influence of pulse-tail energy of short-pulse CO2 laser in drilling of various glasses |
| title_short | Influence of pulse-tail energy of short-pulse CO2 laser in drilling of various glasses |
| title_sort | influence of pulse tail energy of short pulse co2 laser in drilling of various glasses |
| topic | CO2 laser Laser drilling Glass Thermal expansion coefficient Softening point Crack-less |
| url | https://doi.org/10.1186/s44147-023-00311-8 |
| work_keys_str_mv | AT kazuyukiuno influenceofpulsetailenergyofshortpulseco2laserindrillingofvariousglasses AT yasushikodama influenceofpulsetailenergyofshortpulseco2laserindrillingofvariousglasses AT kazuyukiyoneya influenceofpulsetailenergyofshortpulseco2laserindrillingofvariousglasses |