Search query: tunable external cavity semiconductor laser

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abstract: Full C and L band tuning of a compact, MEMS tuned external cavity semiconductor laser is obtained using a MEMS actuated lens to switch between resonator configurations, including one configuration that tunes continuously over 5 THz.
author_names: Douglas William Anthon

Jill D Berger

A A Tselikov
title: C+L band MEMS tunable external cavity semiconductor laser
venue: Optical Fiber Communication Conference, 2004. OFC 2004
year: 2004

abstract: We propose and demonstrate a novel approach to achieving rapid and phase coherent continuous broadband tuning of a single mode external cavity semiconductor laser. Two internal acousto optic devices control the angle of incident light on a diffraction grating and the effective round trip phase electronically. Although the present implementation derives the phase from a long delay line and is not yet mode hop free, the new approach lends itself to fully electronic control.
author_names: Motonobu Kourogi

Kazuhiro Imai

Bagus Widyatmoko

T Shimizu

Motoichi Ohtsu
title: Continuous tuning of an electrically tunable external cavity semiconductor laser.
venue: Optics letters
year: 2000

abstract: An external cavity semiconductor laser employing a birefringent electro optic modulator for wavelength tuning is described. Wide band tuning over 70 A in a single frequency to residual diode modes and narrow band tuning over 0.42 A to many longitudinal modes of the external cavity is demonstrated using different modulator configurations. Threshold current and quantum efficiency are nearly as good as that of the solitary laser diode.
author_names: Alfred T Schremer

C L Tang
title: Single frequency tunable external cavity semiconductor laser using an electro optic birefringent modulator
year: 1989

abstract: An external cavity diode laser is demonstrated to emit greater than 1.0 W CW in a diffraction limited radiation pattern. The laser wavelength is tunable over a 35 nm span centred at 852 nm.
author_names: David G Mehuys

Dave Welch

Donald R Scifres
title: 1 W CW, diffraction limited, tunable external cavity semiconductor laser
year: 1993

abstract: Abstract A tunable dual wavelength fiber ring cavity laser based on semiconductor optical amplifier (SOA) using two external injected distributed feedback (DFB) lasers is proposed and experimentally demonstrated. When one of the injected DFB lasers operates at 25 degC and the other at 0 degC, a stable dual wavelength simultaneous oscillation at 1553.68 nm and 1553.90 nm with a wavelength spacing of 0.22 nm is achieved. The wavelength spacing can be tuned by adjusting the operating temperatures of the two injected DFB lasers, and a tuning range from 0.22 nm to 2.95 nm is obtained. Our experimental results demonstrate the new concept of dual wavelength fiber ring cavity laser using two DFB lasers injection and the technical feasibility.
author_names: Wei Cao

Min Luo

Hai-yan Chen
title: A tunable dual wavelength fiber ring cavity laser based on semiconductor optical amplifier using two external injected DFB lasers
venue: Optik
year: 2019

abstract: Abstract Combination of equivalent reflection cavity model and transmission line theory is applied in theoretical analysis of external cavity semiconductor lasers with sampled fiber Bragg grating. The effects of device parameters on the resonant cavity mode and the side mode suppression ratio have been discussed. For a perfect anti coated facet and the high coupling efficiency, it is found that the Vernier effect between combed reflectivity peaks and F P cavity modes can be destroyed and the laser will work on multi wavelength. The high coupling efficiency plays the same role as the lower anti reflection coating reflectivity in the side mode suppression ratio and the mode resonance. Finally, the side mode suppression ratio is investigated in detail depending on the anti coating reflectivity, the coupling efficiency and the high reflection coating reflectivity.
author_names: Xiaoying He

Wei Li

Jun Zhang

Xiaodong Huang

Jiang Shan

Dexiu Huang
title: Theoretical analysis of widely tunable external cavity semiconductor laser with sampled fiber grating
year: 2006

abstract: We report a continuous wave highly coherent and tunable dual frequency laser emitting at two frequencies separated by 30 GHz to 3 THz, based on compact III V diode pumped quantum well surface emitting semiconductor laser technology. The concept is based on the stable simultaneous operation of two Laguerre Gauss transverse modes in a single axis short cavity, using an integrated sub wavelength thick metallic mask. Simultaneous operation is demonstrated theoretically and experimentally by recording intensity noises and beat frequency, and time resolved optical spectra. We demonstrated a >80 mW output power, diffraction limited beam, narrow linewidth of <300 kHz, linear polarization state >45 dB) and low intensity noise class A dynamics of <0.3% rms, thus opening the path to a compact low cost coherent GHz to THz source development.
author_names: Romain Paquet

Stephane Blin

Mikhael Myara

Luc le Gratiet

Mohamed Sellahi

Baptiste Chomet

Gregoire Beaudoin

Isabelle Sagnes

Arnaud Garnache
title: Coherent continuous wave dual frequency high Q external cavity semiconductor laser for GHz THz applications.
venue: Optics letters
year: 2016

author_names: Chen Shao Wei Chen Shaowei

Lu Xue Qin Lu Xueqin

Zhang Jiang Yong Zhang Jiangyong

Ying Lei Ying Ying Leiying

Zhang Bao Ping Zhang Baoping
title: Blue Violet Broadly Tunable Grating Coupled External Cavity Semiconductor Laser
year: 2013

abstract: The main objective of this study is to develop a near infrared (NIR) tunable external cavity laser (ECL) that is based on a semiconductor optical amplifier and two different wavelength selective elements. In order to achieve the wavelength selection, several filters have been tested in the ECL setups, including plasmonic filter, acoustooptic tunable filter (AOTF) gradient photonic crystal and Fabry Perot (FP) cavity filter. The results show that the AOTF and FP filter have been applied successfully in the ECL system as wavelength selective elements to demonstrate a broadband wavelength tuning in the range between 830 nm and 870 nm. The tunable ECL realized with the variation of electrical radio frequency input of AOTF or incident angle of FP cavity filter from 15.5deg to 30deg in each system. By controlling the wavelength selective elements, continuous tuning of ECL over 30 nm can be achieved and 23 lasing peaks were measured and analyzed in the laser system with FP cavity filter. The characteristics of the AOTF based and FP based tunable ECL, including I V curve, threshold, tuning range and output power, are measured and reported in this thesis.
author_names: Zhiyong Han
title: Tunable External Cavity Ring Laser with Wavelength Selective Elements
year: 2018

abstract: We demonstrate high power (2.1W) low noise single frequency operation of a tunable compact verical external cavity surface emitting laser exhibiting a high beam quality. We took advantage of thermal lens based stability to develop a short (3 10 mm) plano plano external cavity without any intracavity filter. The semiconductor structure emitting at 1microm is optically pumped by a 8W commercial 808 nm multimode diode laser at large incidence angle. For heat management purpose the GaAs based VECSEL membrane was bonded on a SiC substrate. We measured a low divergence quasi circular TEM00 beam (M2 1.2) close to diffraction limit, with a linear light polarization >30 dB).We simulated the steady state laser beam of this unstable cavity using Fresnel diffraction. The side mode suppression ratio is 45 dB. The free running laser linewidth is 37 kHz limited by pump induced thermal fluctuations. Thanks to this high Q external cavity approach, the frequency noise is low and the dynamics is in the relaxation oscillation free regime, exhibiting low intensity noise 0.1% with a cutoff frequency approximately 41MHz above which the shot noise level is reached. The key parameters limiting the laser power and coherence are studied. This design/properties can be extended to other wavelengths.
author_names: Alexandre Laurain

Mikhael Myara

Gregoire Beaudoin

Isabelle Sagnes

Arnaud Garnache
title: Multiwatt power highly coherent compact single frequency tunable vertical external cavity surface emitting semiconductor laser.
venue: Optics express
year: 2010