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Laser light of wavelength 640 nm incident on a pair of slits produces an interference pattern in which the bright fringes are separated by 7.2 mm - CBSE Class 12 Physics - Learn CBSE Forum
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Nanosecond Pulsed Laser Systems
Thorlabs - HL6362MG 640 nm, 40 mW, Ø5.6 mm, A Pin Code, Laser Diode
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Passively Q-switched 8.5-ns Pr3+:YLF laser at 640 nm | SpringerLink
473/532/640 nm Triple Wavelength DPSS/Diode Laser System | 300 - 1000 mW Output Power | Laserglow
OBIS 640nm LX 75mW Laser System, Fiber Pigtail, FC