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12 April 2023jameszbw

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New high-power femtosecond fibre laser installed at Bangor

21 March 202310 April 2023jameszbw

Bangor University CPE team has recently acquired and installed a state-of-the-art high power femtosecond fibre laser (model: Jasper X0 30W from Fluence) system in their lab. The system is highly robust, reliable, flexible and tuneable, offering >100 uJ maximum pulse energy, 200kHz-20MHz repetition rate, 200fs – 20ps pulse duration, and four working wavelengths (1030nm, 515 nm, 343nm, 258nm, all avaliable).

Some applications of this laser include: Micromachining, Glass cutting, Surface structuring, Ophthalmology, Semiconductor & OLED manufacturing, Solar cell manufacturing, security marking, Stents and medical device manufacturing.

Optical property, nk, dielectric constants

7 February 20237 February 2023jameszbw

n and k from Essential MacLeod Library:

ZrO2 Download

Ag Download

Al Download

Axicon lens focusing

1 February 20231 February 2023jameszbw

from math import *

#Axicon focus: https://www.edmundoptics.com/knowledge-#center/application-notes/lasers/an-in-depth-look-at-axicons/

#constant ring size t, but totoal size dr increase with distance L

alpha = 40 # angle of apha in degree unit
alpha = alpha*pi/180
D = 4 # Beam diameter mm
R = D/2 # radius of incident beam
n= 1.46 # refractive index of lens
L = 5 # distance from lens

#DOF

DOF1 = Rsqrt(1-nnsin(alpha)sin(alpha))
DOF2 = sin(alpha)cos(alpha)(ncos(alpha)-sqrt(1-nnsin(alpha)sin(alpha)))
DOF = DOF1/DOF2

#t: ring thickness

t1 = DOF1
t2 = cos(alpha)* (nsin(alpha)sin(alpha)+cos(alpha)sqrt(1-nnsin(alpha)sin(alpha)))
t= t1/t2

#dr: totoal spot size (outside of ring edge)

dr1 = sin(alpha)(ncos(alpha)-sqrt(1-nnsin(alpha)sin(alpha))) dr2 = nsin(alpha)sin(alpha) + cos(alpha)sqrt(1-nnsin(alpha)sin(alpha)) dr = 2L*dr1/dr2

print(f’Incident beam size ={2*R} (mm)’)
print(f’DOF={DOF} (mm)’)
print(f’Ring thickness={t} (mm)’)
print(f’Ring size in total={dr} (mm)’)

from math import *


# Axicon focus: https://www.edmundoptics.com/knowledge-center/application-notes/lasers/an-in-depth-look-at-axicons/
# constant ring size t, but totoal size dr increase with distance L 
# 
alpha = 40   # angle of apha in degree unit
alpha = alpha*pi/180
D = 4   # Beam diameter mm
R = D/2   # radius of incident beam
n= 1.46       # refractive index of lens
L = 5     # distance from lens

# DOF
DOF1 = R*sqrt(1-n*n*sin(alpha)*sin(alpha))
DOF2 = sin(alpha)*cos(alpha)*(n*cos(alpha)-sqrt(1-n*n*sin(alpha)*sin(alpha)))
DOF = DOF1/DOF2

#t: ring thickness
t1 = DOF1
t2 = cos(alpha)* (n*sin(alpha)*sin(alpha)+cos(alpha)*sqrt(1-n*n*sin(alpha)*sin(alpha)))
t= t1/t2

#dr: totoal spot size (outside of ring edge)
dr1 = sin(alpha)*(n*cos(alpha)-sqrt(1-n*n*sin(alpha)*sin(alpha)))
dr2 = n*sin(alpha)*sin(alpha) + cos(alpha)*sqrt(1-n*n*sin(alpha)*sin(alpha))
dr = 2*L*dr1/dr2

print(f'Incident beam size ={2*R} (mm)')
print(f'DOF={DOF} (mm)')
print(f'Ring thickness={t} (mm)')
print(f'Ring size in total={dr} (mm)')

AIGC: generate video and photo resotore

29 January 202329 January 2023jameszbw

Use Photo restoration with GFP-GAN at https://app.baseten.co/apps/QPp4nPE/operator_views/RqgOnqV

I easily resotred an old low-resolution image, result is amazing:

Next, I use d-id.com to generate an introducion of myself, again, amazing:

Analysis of infrared nanojets with self-focusing nonlinearities

14 December 202214 December 2022jameszbw

josab-39-12-3296 Download

Fw: UV lamp

7 November 2022jameszbw

UV lamp

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You are welcome to contact the University in Welsh or English

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Gall y neges e-bost hon, ac unrhyw atodiadau a anfonwyd gyda hi, gynnwys deunydd cyfrinachol ac wedi eu bwriadu i’w defnyddio’n unig gan y sawl y cawsant eu cyfeirio ato (atynt). Os ydych wedi derbyn y neges e-bost hon trwy gamgymeriad, rhowch wybod i’r anfonwr ar unwaith a dilewch y neges. Os na fwriadwyd anfon y neges atoch chi, rhaid i chi beidio a defnyddio, cadw neu ddatgelu unrhyw wybodaeth a gynhwysir ynddi. Mae unrhyw farn neu safbwynt yn eiddo i’r sawl a’i hanfonodd yn unig ac nid yw o anghenraid yn cynrychioli barn Prifysgol Bangor. Nid yw Prifysgol Bangor yn gwarantu bod y neges e-bost hon neu unrhyw atodiadau yn rhydd rhag firysau neu 100% yn ddiogel. Oni bai fod hyn wedi ei ddatgan yn uniongyrchol yn nhestun yr e-bost, nid bwriad y neges e-bost hon yw ffurfio contract rhwymol – mae rhestr o lofnodwyr awdurdodedig ar gael o Swyddfa Cyllid Prifysgol Bangor.

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