Stabilization of the Absolute Frequency and Phase of a Compact, Low Jitter Modelocked Semiconductor Diode Laser PDF Download
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Languages : en
Pages : 15
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Book Description
This research project was aimed at the stabilization of the frequency and phase of a set of optical combs from a semiconductor laser operating in an active mode-locked regime. To achieve this, an intracavity Pound-Drever-Hall technique was used on a 10 GHz harmonically mode-locked semiconductor ring laser and obtained a simultaneous optical frequency comb stabilization within 3 MHz range and supermode phase noise suppression. Together with an additional phase-lock-loop, the timing jitter integrated from 10 Hz to 10 MHz (5 GHz) was 63.5 fs (161 fs). Approximately 25 fsec of the integrated noise is attributed to line noise, resulting in a net jitter of 38 fsec. This work represents, to our knowledge, the first stabilized modelocked diode laser using PDH that achieves both supermode elimination and optical frequency comb stabilization. The resulting optical comb source may be useful for advanced RF imaging radar for optical sampling in ADC or in novel waveform generation (DAC's).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 15
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Book Description
This research project was aimed at the stabilization of the frequency and phase of a set of optical combs from a semiconductor laser operating in an active mode-locked regime. To achieve this, an intracavity Pound-Drever-Hall technique was used on a 10 GHz harmonically mode-locked semiconductor ring laser and obtained a simultaneous optical frequency comb stabilization within 3 MHz range and supermode phase noise suppression. Together with an additional phase-lock-loop, the timing jitter integrated from 10 Hz to 10 MHz (5 GHz) was 63.5 fs (161 fs). Approximately 25 fsec of the integrated noise is attributed to line noise, resulting in a net jitter of 38 fsec. This work represents, to our knowledge, the first stabilized modelocked diode laser using PDH that achieves both supermode elimination and optical frequency comb stabilization. The resulting optical comb source may be useful for advanced RF imaging radar for optical sampling in ADC or in novel waveform generation (DAC's).
Author:
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Category :
Languages : en
Pages : 35
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Book Description
This research project was aimed at generating a train of ultralow noise optical pulses from a semiconductor diode laser for applications in optical sampling. Typical optical sampling applications may be similar to that encountered in analog to digital converter scenarios. The performance parameters aimed for in this project would support 12 bits of effective resolution at a sampling rate of 10 gigasamples per second. The results of this effort show that by properly engineering the modelocked oscillator design, the timing stability of modelocked diode lasers may perform on a par of atomic clocks.
Author: John L. Hall
Publisher: SPIE-International Society for Optical Engineering
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 296
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Author: Joseph S. Wells
Publisher:
ISBN:
Category : Frequency stability
Languages : en
Pages : 60
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Author: Duo Li (Ph. D.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 119
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Book Description
Photonic microwave oscillator based on optical frequency comb and ultrastable optical reference cavity represents the state-of-the-art solution to generate X-band microwaves of ultralow phase noise. Such high-quality microwave source enables a range of applications in which frequency stability and timing accuracy are essential to performance. Wide use of this technology, however, requires compact system architecture, low-term stability and low energy consumption, which drive the needs to develop high repetition-rate femtosecond lasers alternative to Ti:sapphire technology, and to explore a feasible means to achieve integrated photonic microwave oscillators. Ultrafast Cr:LiSAF lasers can be directly pumped with low-cost red laser diodes, and the electrical-to-optical conversion efficiency is as high as 10%. High repetition-rate femtosecond Cr:LiSAF lasers are developed with the help of semiconductor saturable absorber technology, efficient dispersion compensation mirror design algorithms, and heat management of the saturable absorber. The I-GHz Cr:LiSAF oscillator generates 55-fs pulses with 110 pJ pulse energy, which represents almost two orders of magnitude improvement in the output peak power over previous results. Timing jitter of 1 00-MHz Cr:LiSAF lasers is measured with a single-crystal balanced optical cross-correlator to be -30 as from 10 kHz to 50 MHz. Pump intensity noise coupled into phase noise through the self-steepening effect proves to be the major noise source. The most recent advance in silicon photonics and wafer-scale three-dimensional integration technology illuminates a pathway toward on-chip photonic microwave oscillators. Phase noise model of the proposed Erbium Silicon Photonics Integrated OscillatoR (ESPIOR) suggests that it is possible to achieve comparable noise performance with the Ti:sapphire-based system, without the need of carrier-envelope-offset frequency detection. A demonstration using fiber-optic components further indicates that it is practicable to realize optical frequency division and microwave readout in the proposed architecture. With the advancement of heterogeneous electronic-photonic integration, it would pave the way for an ultralow-noise microwave source fully integrated in a hybrid photonic-electronic chip on a silicon substrate.
Author: Yaakov Shevy
Publisher: SPIE-International Society for Optical Engineering
ISBN:
Category : Science
Languages : en
Pages : 278
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Book Description
Author: Andreas Jechow
Publisher: Universitätsverlag Potsdam
ISBN: 3869560312
Category : Science
Languages : en
Pages : 152
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Book Description
A huge number of applications require coherent radiation in the visible spectral range. Since diode lasers are very compact and efficient light sources, there exists a great interest to cover these applications with diode laser emission. Despite modern band gap engineering not all wavelengths can be accessed with diode laser radiation. Especially in the visible spectral range between 480 nm and 630 nm no emission from diode lasers is available, yet. Nonlinear frequency conversion of near-infrared radiation is a common way to generate coherent emission in the visible spectral range. However, radiation with extraordinary spatial temporal and spectral quality is required to pump frequency conversion. Broad area (BA) diode lasers are reliable high power light sources in the near-infrared spectral range. They belong to the most efficient coherent light sources with electro-optical efficiencies of more than 70%. Standard BA lasers are not suitable as pump lasers for frequency conversion because of their poor beam quality and spectral properties. For this purpose, tapered lasers and diode lasers with Bragg gratings are utilized. However, these new diode laser structures demand for additional manufacturing and assembling steps that makes their processing challenging and expensive. An alternative to BA diode lasers is the stripe-array architecture. The emitting area of a stripe-array diode laser is comparable to a BA device and the manufacturing of these arrays requires only one additional process step. Such a stripe-array consists of several narrow striped emitters realized with close proximity. Due to the overlap of the fields of neighboring emitters or the presence of leaky waves, a strong coupling between the emitters exists. As a consequence, the emission of such an array is characterized by a so called supermode. However, for the free running stripe-array mode competition between several supermodes occurs because of the lack of wavelength stabilization. This leads to power fluctuations, spectral instabilities and poor beam quality. Thus, it was necessary to study the emission properties of those stripe-arrays to find new concepts to realize an external synchronization of the emitters. The aim was to achieve stable longitudinal and transversal single mode operation with high output powers giving a brightness sufficient for efficient nonlinear frequency conversion. For this purpose a comprehensive analysis of the stripe-array devices was done here. The physical effects that are the origin of the emission characteristics were investigated theoretically and experimentally. In this context numerical models could be verified and extended. A good agreement between simulation and experiment was observed. One way to stabilize a specific supermode of an array is to operate it in an external cavity. Based on mathematical simulations and experimental work, it was possible to design novel external cavities to select a specific supermode and stabilize all emitters of the array at the same wavelength. This resulted in stable emission with 1 W output power, a narrow bandwidth in the range of 2 MHz and a very good beam quality with M²<1.5. This is a new level of brightness and brilliance compared to other BA and stripe-array diode laser systems. The emission from this external cavity diode laser (ECDL) satisfied the requirements for nonlinear frequency conversion. Furthermore, a huge improvement to existing concepts was made. In the next step newly available periodically poled crystals were used for second harmonic generation (SHG) in single pass setups. With the stripe-array ECDL as pump source, more than 140 mW of coherent radiation at 488 nm could be generated with a very high opto-optical conversion efficiency. The generated blue light had very good transversal and longitudinal properties and could be used to generate biphotons by parametric down-conversion. This was feasible because of the improvement made with the infrared stripe-array diode lasers due to the development of new physical concepts.
Author:
Publisher:
ISBN:
Category : Electronic journals
Languages : en
Pages : 814
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Author: Klaus Petermann
Publisher: Springer Science & Business Media
ISBN: 9789027726728
Category : Technology & Engineering
Languages : en
Pages : 334
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Book Description
Laser diodes represent a key element in the emerging field of opto electronics which includes, for example, optical communication, optical sensors or optical disc systems. For all these applications, information is either transmitted, stored or read out. The performance of these systems depends to a great deal on the performance of the laser diode with regard to its modulation and noise characteristics. Since the modulation and noise characteristics of laser diodes are of vital importance for optoelectronic systems, the need for a book arises that concentrates on this subject. This book thus closes the gap between books on the device physics of semiconductor lasers and books on system design. Complementary to the specific topics concerning modulation and noise, the first part of this book reviews the basic laser characteristics, so that even a reader without detailed knowledge of laser diodes may follow the text. In order to understand the book, the reader should have a basic knowledge of electronics, semiconductor physics and optical communica tions. The work is primarily written for the engineer or scientist working in the field of optoelectronics; however, since the book is self-contained and since it contains a lot of numerical examples, it may serve as a textbook for graduate students. In the field of laser diode modulation and noise a vast amount has been published during recent years. Even though the book contains more than 600 references, only a small part of the existing literature is included.
Author: Tetsuhiko Ikegami
Publisher: Artech House Publishers
ISBN: 9780890066485
Category : Technology & Engineering
Languages : en
Pages : 356
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Book Description
This reference describes in detail the critical issue of frequency stabilization of semiconductor laser diodes, with emphasis on the practical frequency stabilization schemes of laser diodes and laser modules, and their applications to optical transmission systems, optical measurements, photonics switching systems, and more.
