Optical Q-switching to generate ultra short pulses in diode lasers
First Claim
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1. A system for optically generating short width optical pulses comprising:
- a first semiconductor DFB laser having a MQW active region to produce a laser output of a first wavelength in response to an injected current, said first laser having a common contact of one polarity and pair of isolated contacts of an opposite polarity;
means to provide separately adjustable injection current to each one of said pair of isolated contacts;
a second semiconductor DFB laser having an active region to produce a laser output of a second wavelength, said second wavelength being longer than said first;
means to provide a modulated input current to said second laser; and
optical transfer means between the active region of said first laser and the active region of said second laser whereby the first laser is pumped with the modulated output of the second.
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Abstract
A system for generating an ultra short optical pulse by pumping a semiconductor signal laser with an optical pulse from a semiconductor probe laser. The signal laser has dual segments each operated under different d.c. injection current levels. The probe laser is modulated with a pulsed input and the optical output thereof is coupled via optical means to the signal laser so as to Q-switch the latter. Optical pulses in the 65 ps range result.
17 Citations
16 Claims
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1. A system for optically generating short width optical pulses comprising:
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a first semiconductor DFB laser having a MQW active region to produce a laser output of a first wavelength in response to an injected current, said first laser having a common contact of one polarity and pair of isolated contacts of an opposite polarity; means to provide separately adjustable injection current to each one of said pair of isolated contacts; a second semiconductor DFB laser having an active region to produce a laser output of a second wavelength, said second wavelength being longer than said first; means to provide a modulated input current to said second laser; and optical transfer means between the active region of said first laser and the active region of said second laser whereby the first laser is pumped with the modulated output of the second. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of generating an ultra short optical pulse by Q-switching a DFB dual segment signal laser having an MQW with the optical output of a probe DFB laser, the method comprising:
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operating the signal laser with first and second separately controllable injection current levels to each of said dual segments to generate an output of a first wavelength; operating a probe DFB laser with a modulating current to produce optical pulses of a second wavelength; and coupling the optical pulses from the probe laser to the signal laser so as to Q-switch the signal laser. - View Dependent Claims (14, 15, 16)
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Specification