Helium-neon laser tube for mode-locking experiments
date: label: date made
content: 1963
name: label: maker
content: Bell Laboratories
notes: label: Description (Brief)
content: This helium-neon laser tube was used along with a crystal (catalog #2022.0154.01) for mode-locking experiments at Bell Telephone Labs by Logan E. Hargrove in 1963. The tube helped Hargrove and colleagues demonstrate the phenomenon of mode-locking with laser emissions. The technique of mode locking allows for generation of extremely short pulses of laser light. Such lasers are valuable for laboratory research investigating physics, chemistry, and optical phenomena that occur on very short timescales, as well as having medical applications.
label: Description (Brief)
content: Written on tipped end: “ML22”. Metal tag removed from tube etched: “7052 glass ML22 Avg I.D. = .213” ”. Paper tag removed from tube written: “Tube ML22 (concentric) 40[m?]a Box #12 30K[ohms] [??1]92 KV 4.4 [amp?] filament.”
label: Description (Brief)
content: References: US Patent #3412251, “Mode Locking in a Synchronously Modulated Maser,” filed 24 April 1964, issued 19 November 1968 to Logan E. Hargrove, assigned to Bell Telephone Laboratories. See also: Valdmanis, J. A., Richard L. Fork, and James P. Gordon, “Generation of optical pulses as short as 27 femtoseconds directly from a laser balancing self-phase modulation, group-velocity dispersion, saturable absorption, and saturable gain,” Optics Letters 10, no. 3 (1985): 131-133.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Logan E. Hargrove
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 2014.0199.01
label: catalog number
content: 2014.0199.01
label: accession number
content: 2014.0199
label: patent number
content: 3412251
objectType: label: Object Name
content: laser tube
physicalDescription: label: Measurements
content: overall: 44 in x 6 5/8 in x 1 1/2 in; 111.76 cm x 16.8275 cm x 3.81 cm