The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform
Anne C. Tropper - One of the best experts on this subject based on the ideXlab platform.
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Repetition-Frequency-tunable mode-locked surface emitting semiconductor laser between 2.78 and 7.87 GHz
Optics express, 2011Co-Authors: Keith G. Wilcox, Adrian H. Quarterman, H. E. Beere, David A. Ritchie, Anne C. TropperAbstract:We report a Repetition Frequency tunable, passively mode-locked vertical-external-cavity surface-emitting semiconductor laser (VECSEL) with continuous Repetition Frequency tuning between 2.78 and 7.87 GHz using mechanical tuning of the laser cavity length. The laser emits near-transform-limited, sub-500-fs pulses over almost an octave tuning range between 2.78 and 5 GHz. At Repetition rates above 6 GHz the pulse duration increases to ~2.5 ps. Over the entire tuning range the laser emits an average output power of 40 ± 5 mW in a fundamental transverse mode. The change in pulse duration highlights a change in the dominant modelocking mechanism which forms the pulses. At high Repetition frequencies the pulse duration is set by the saturable absorber recovery time. At low Repetition frequencies the fluence and peak intensity on the SESAM increases to a point where the fast pulse shaping mechanisms of the optical Stark effect and carrier thermalization dominate the pulse shortening.
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Variable Repetition Frequency femtosecond-pulse surface emitting semiconductor laser
Applied Physics Letters, 2011Co-Authors: Keith G. Wilcox, Adrian H. Quarterman, H. E. Beere, David A. Ritchie, Anne C. TropperAbstract:We report a femtosecond-pulse vertical-external-cavity surface-emitting laser with a continuous Repetition Frequency tuning range of 8% near 1 GHz. A constant average output power of 56 ± 1 mW and near-transform-limited pulse duration of 450 ± 20 fs were observed across the entire tuning range.
Keith G. Wilcox - One of the best experts on this subject based on the ideXlab platform.
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Repetition-Frequency-tunable mode-locked surface emitting semiconductor laser between 2.78 and 7.87 GHz
Optics express, 2011Co-Authors: Keith G. Wilcox, Adrian H. Quarterman, H. E. Beere, David A. Ritchie, Anne C. TropperAbstract:We report a Repetition Frequency tunable, passively mode-locked vertical-external-cavity surface-emitting semiconductor laser (VECSEL) with continuous Repetition Frequency tuning between 2.78 and 7.87 GHz using mechanical tuning of the laser cavity length. The laser emits near-transform-limited, sub-500-fs pulses over almost an octave tuning range between 2.78 and 5 GHz. At Repetition rates above 6 GHz the pulse duration increases to ~2.5 ps. Over the entire tuning range the laser emits an average output power of 40 ± 5 mW in a fundamental transverse mode. The change in pulse duration highlights a change in the dominant modelocking mechanism which forms the pulses. At high Repetition frequencies the pulse duration is set by the saturable absorber recovery time. At low Repetition frequencies the fluence and peak intensity on the SESAM increases to a point where the fast pulse shaping mechanisms of the optical Stark effect and carrier thermalization dominate the pulse shortening.
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Variable Repetition Frequency femtosecond-pulse surface emitting semiconductor laser
Applied Physics Letters, 2011Co-Authors: Keith G. Wilcox, Adrian H. Quarterman, H. E. Beere, David A. Ritchie, Anne C. TropperAbstract:We report a femtosecond-pulse vertical-external-cavity surface-emitting laser with a continuous Repetition Frequency tuning range of 8% near 1 GHz. A constant average output power of 56 ± 1 mW and near-transform-limited pulse duration of 450 ± 20 fs were observed across the entire tuning range.
M Gong - One of the best experts on this subject based on the ideXlab platform.
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high Repetition Frequency ppmgoln mid infrared optical parametric oscillator
Laser Physics Letters, 2010Co-Authors: Honglei Chen, M GongAbstract:A mid-infrared optical parametric oscillator (OPO) with the idler wavelengths of 3591 nm, 3384 nm, and 3164 nm at the Repetition of 76.8 kHz is reported, and a high Repetition Frequency acousto-optic Q-switched Nd:YVO4 laser is used as the pump source. The OPO is designed as an external non-colinear single-resonator optical parametric oscillator. When the power of the pump light is 25.1 W, the idler with the wavelength of 3164 nm and the power of 4.3 W is generated. The corresponding signal light is 1603 nm with the power of 3.1 W. The efficiency from 1064 nm to 3160 nm can reach as high as 17.1%, and the efficiency of the OPO is 29.5%.
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high pulse Repetition Frequency all solid state 1053 nm nd ylf laser
Laser Physics Letters, 2010Co-Authors: Yutong Sun, H Zhang, Q Liu, L Huang, Y Wang, M GongAbstract:We presented a high pulse Repetition Frequency (PRF) all-solid-state 1053 nm Nd:YLF laser with laser diode (LD) end-pumped and acousto-optic (AO) Q-switching configuration. When the PRF reached 50 kHz, 1.12 W average power and 541 W peak power was obtained, corresponding to the optical-optical efficiency of 31.2% and the pump power of 3.58 W, and the pulse width was compressed to 41.4 ns with the ultrashort cavity length of 40 mm, and the pulse instability smaller than 4%. The beam quality factors and the angle drift were measured as M2x = 1.247 and M2y = 1.285 and 0.2 mrad, respectively.
Eric Donkor - One of the best experts on this subject based on the ideXlab platform.
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A passively modelocked laser with tunable pulse-Repetition Frequency in a semiconductor optical amplifier
Enabling Photonics Technologies for Defense Security and Aerospace Applications VIII, 2012Co-Authors: Eric Donkor, Kimberly KalteneckerAbstract:We present experimental demonstration of passively modelocked laser with pulse-Repetition Frequency tunable using semiconductor optical amplifier as the gain medium. The principle of operation is based on normal mode competition of a coupled cavity comprised of a quantum cavity and an optical cavity represented by a semiconductor gain medium, and a high-birefringence fiber in line with a Faraday mirror respectively. Experimental results are presented for pulse-Repetition Frequency shows stable tunability over a Frequency decade of 93MHz and 1400MHz.
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Passively Modelocked Laser With Tunable Pulse Repetition Frequency in a Semiconductor Optical Amplifier
IEEE Journal of Quantum Electronics, 2011Co-Authors: Patrick D. Kumavor, Eric DonkorAbstract:We present the experimental demonstration of a pulse Repetition Frequency tunable passively mode-locked laser using semiconductor optical amplifier as the gain medium. The laser is designed for the 1550-nm telecommunication applications. The mode-locking mechanism is explained in terms of normal mode splitting of the continuous-wave spontaneous emission signal from the semiconductor optical amplifier. The splitting arises from the coupling between a quantum cavity, represented by the semiconductor gain medium, and an optical cavity comprised of a high-birefringence fiber in line with a Faraday mirror. Experimental results are presented for pulse Repetition Frequency tunability ranging between 93 and 1400 MHz, as well as for the pulse width which is measured to be 343 ps. These results are shown to compare favorably with theoretical calculations.
Ronald Holzwarth - One of the best experts on this subject based on the ideXlab platform.
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terahertz spectrometer operation by laser Repetition Frequency tuning
Journal of The Optical Society of America B-optical Physics, 2011Co-Authors: Rafal Wilk, Thomas Hochrein, Martin Koch, Michael Mei, Ronald HolzwarthAbstract:We present a fully fiber-coupled terahertz time domain spectrometer based on a single ultrafast laser with an adjustable pulse Repetition Frequency that does not employ an external delay line. Our approach represents a major improvement over other schemes that either employ external movable delay lines or alternatively asynchronous optical sampling schemes that also do not need an external delay stage, but employ two lasers instead. The scanning range of our spectrometer covers the full temporal delay between two adjacent pulses of 4 ns. This allows for a fully fiber-coupled system, enabling unprecedented robustness and ease of use.