Linewidth narrowing and wideband frequency modulation of a DBR laser

Journal Article · Fri Sep 12 00:00:00 EDT 2025 · Optics Express

DOI:https://doi.org/10.1364/OE.572129· OSTI ID:2589076

Roth, Jack ^[1]; Christensen, Andrew ^[1]; Bernstein, Madeline ^[1]; Iwasaki, Yuno ^[1]; Lampson, Hana ^[2]; Mueller, Holger ^[1]

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1. University of California, Berkeley, CA (United States)
2. Harvard University, Cambridge, MA (United States)

We present a scheme to phase-lock a 240 mW, 852 nm distributed Bragg reflector (DBR) laser to a fixed-frequency narrow-linewidth laser with a rapidly tunable frequency offset near 9 GHz. The phase-lock is accomplished by electronic feedback on the beatnote between the two lasers. The frequency offset can be swept 200 MHz in 300 us, limited by the feedback loop bandwidth, allowing for its use in complex cooling and state preparation schemes needed in atomic physics experiments. Here, we find that the phase-lock reduces the linewidth of the DBR laser below its natural linewidth of ~400 kHz to ~100 kHz

• Research Organization: University of California, Berkeley, CA (United States)
• Sponsoring Organization: USDOE; National Science Foundation (NSF); NASA Jet Propulsion Laboratory
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 2589076
• Journal Information: Optics Express, Journal Name: Optics Express Journal Issue: 20 Vol. 33; ISSN 1094-4087
• Publisher: Optica Publishing Group
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
74 ATOMIC AND MOLECULAR PHYSICS
atom interferometry
atomic physics
diode laser
distributed Bragg reflector laser
phase lock