1,720,992 research outputs found
Frequency modulated mode-locked fiber laser with an integrated fiber phase modulator
No full textA Nd3+-doped fiber laser has been FM modelocked by two means: 20-ps pulses were obtained with a bulk phase modulator. Detuning the modulation frequency induced FM operation which broadened the laser bandwidth to 57 GHz. An integrated fiber phase modulator produced 80-ps pulses. Low intracavity losses led to submilliwatt thresholds and slope efficiencies in excess of 45%
Accurate optical frequency-interval measurement by use of nonresonant frequency comb generation
Full text linkA novel technique for measuring the separation of widely spaced optical frequencies is demonstrated. It relies on frequency comb generation by use of a laser that incorporates a frequency-shifting element. A Nd:YLF laser is used to produce a frequency comb that has a bandwidth of 140 GHz and that contains in excess of 875 discrete frequencies, accurately spaced by 160 MHz. The longitudinal mode spacing of a dual-frequency laser was measured to an accuracy of ±5 kHz in 3,733,440.0 kHz by use of the technique described here
Frequency comb generation and pulsed operation in a Nd:YLF laser with frequency-shifted feedback
No full textAn injection-seeded Nd: YLF laser incorporating frequency shifted feedback generates a frequency comb with a 140 GHz bandwidth and a tunable frequency spacing. Near bandwidth-limited pulses of 31 ps duration have been produced in the seeded laser by matching the frequency shift to a multiple of the cavity roundtrip frequency
Frequency-modulation mode-locking of a Nd<sup>3+</sup>-doped fibre laser
No full textFrequency-modulation mode locking of a Nd3+-doped fiber laser operating at 1.09 µm using a bulk phase modulator is reported. The resulting pulses have a 20-psec duration (FWHM) and a peak power of 1 W. A least-squares fit to the second-harmonic-intensity autocorrelation trace and the time-bandwidth product of 0.30 ± 0.04 suggest that the pulses are bandwidth limited with a sech2-type profile
Diode-pumped FM modelocked fibre laser with coupled cavity bandwidth selection
No full textA diode-laser-pumped Nd3+-doped fibre laser has been actively mode-locked using an integrated fibre phase modulator. Pulses with a sub-80 ps duration are observed at a repetition rate of 417 MHz. Near bandwidth-limited operation is achieved by restricting the laser bandwidth by feedback off a diffraction grating in an external coupled cavity. Low intracavity losses support a submilliwatt laser threshold and a slope efficiency in excess of 48%
Frequency modulated mode-locked fibre laser with bulk and integrated fibre phase modulators
No full textA laser-diode-pumped Nd:glass laser mode-locked, high power and single frequency performance
No full textThe authors report the performance of a laser-diode-pumped Nd:glass laser. Using the AM active mode-locking technique, pulses as short as 9 ps were obtained. The development of a high-power (415 mW), high-optical-slope-efficiency (32.4%) laser-diode-pumped Nd:glass laser using high-power, broad stripe laser diodes as the pump source is described. Single-frequency operation of the Nd:glass laser using an acoustooptic modulator to ensure unidirectional operation in a ring laser configuration was investigated. An instantaneous linewidth of less than 300 Hz was observed
Pulse repetition rates in passive, self-starting, femtosecond soliton fibre laser
Full text linkSeveral unusual pulsing modes are observed in a selfstarting, passively mode-locked erbium fibre soliton laser capable of generating pulses with durations as short as 320 fs
Measurements of fibre laser losses via relaxation oscillation
No full textWe describe a simple method for measuring fibre laser losses. The method is based on inducing relaxation oscillations by modulating the laser gain. From the oscillation frequency and known fibre parameters a loss figure can be extracted. Loss measurements performed on a Nd-doped fibre laser are presented
Active mode-locking of a Yb:Er fibre laser
No full textWe report FM mode-locked operation of a single-mode Yb:Er fibre laser at 1.56µm. To date pulses of 70ps duration and peak output powers of 90mW have been achieved
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