Intrinsic linewidth of quantum cascade laser frequency combs
نویسندگان
چکیده
منابع مشابه
Measuring frequency noise and intrinsic linewidth of a room-temperature DFB quantum cascade laser.
The frequency-noise power spectral density of a room-temperature distributed-feedback quantum cascade laser emitting at λ = 4.36 μm has been measured. An intrinsic linewidth value of 260 Hz is retrieved, in reasonable agreement with theoretical calculations. A noise reduction of about a factor 200 in most of the frequency interval is also found, with respect to a cryogenic laser at the same wav...
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A comprehensive investigation of the frequency-noise spectral density of a free-running midinfrared quantum-cascade laser is presented for the first time. It provides direct evidence of the leveling of this noise down to a white-noise plateau, corresponding to an intrinsic linewidth of a few hundred hertz. The experiment is in agreement with the most recent theory on the fundamental mechanism o...
متن کاملMeasurement of the intrinsic linewidth of terahertz quantum cascade lasers using a near-infrared frequency comb.
We report the measurement of the frequency noise power spectral density of a quantum cascade laser emitting at 2.5THz. The technique is based on heterodyning the laser emission frequency with a harmonic of the repetition rate of a near-infrared laser comb. This generates a beatnote in the radio frequency range that is demodulated using a tracking oscillator allowing measurement of the frequency...
متن کاملFundamental frequency noise and linewidth broadening caused by intrinsic temperature fluctuations in quantum cascade lasers
T. Liu1 and Q. J. Wang1,2,* 1Division of Microelectronics, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Ave., Singapore, 639798 2Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371 (Received 11 April 2011; revised manuscript received 22 June 2011; published 30 ...
متن کاملNoise-induced linewidth in frequency combs.
Frequency combs generated by trains of pulses emitted from mode-locked lasers are analyzed when the center time and phase of the pulses undergo noise-induced random walk, which broadens the comb lines. Asymptotic analysis and computation reveal that, when the standard deviation of the center-time jitter of the nth pulse scales as n(p/2) where p is a jitter exponent, the linewidth of the kth com...
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ژورنال
عنوان ژورنال: Optica
سال: 2015
ISSN: 2334-2536
DOI: 10.1364/optica.2.000836