Accession Number:

AD1013214

Title:

Phase and Frequency Control of Laser Arrays for Pulse Synthesis

Descriptive Note:

Technical Report,01 Apr 2011,30 Sep 2014

Corporate Author:

University of Colorado Boulder United States

Personal Author(s):

• Gopinath,Juliet T.

Report Date:

2015-01-02

Pagination or Media Count:

27.0

Abstract:

A phase locked source, consisting of three beams at fo, fo - 80 MHz, and fo 80 MHz, was demonstrated. Fast feedback was implemented by an FPGA using a single phase-sensitive detector that recorded the peak power of the waveform. We use feedback from a piezo and current-control of a tapered amplifier. We have demonstrated a pulse train of 4.9 ns pulses at 80 MHz, an order of magnitude reduction in phase noise, and the potential for long-term stability. Additionally, we have explored methods for improving the beam quality of a broad area laser array in a wavelength beam combining cavity. Brightness can be increased by imaging the diffraction-limited fast axis back onto the slow axis, with proper astigmatism compensation. The work has been submitted to the 2014 Conference on Lasers and Electro-Optics CLEO, presented at the 2013 CLEO, one journal paper published in Optics Express, and another is currently under review for publication in Optics Letters.

Descriptors:

• diode lasers
• pulsed laser
• field programmable gate arrays
• waveforms
• continuous waves
• laser beams

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE