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Harmonic mode-locking of diode-pumpe...

Godil, Asif A.

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Harmonic mode-locking of diode-pumped lasers and time-lenses with picosecond resolution.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Harmonic mode-locking of diode-pumped lasers and time-lenses with picosecond resolution./
Author:	Godil, Asif A.
Description:	111 p.
Notes:	Source: Dissertation Abstracts International, Volume: 53-11, Section: B, page: 5887.
Contained By:	Dissertation Abstracts International53-11B.
Subject:	Electrical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9309597

Harmonic mode-locking of diode-pumped lasers and time-lenses with picosecond resolution.
Godil, Asif A.

Harmonic mode-locking of diode-pumped lasers and time-lenses with picosecond resolution. - 111 p.

Source: Dissertation Abstracts International, Volume: 53-11, Section: B, page: 5887.

Thesis (Ph.D.)--Stanford University, 1993.

In recent years there has been great interest in short pulsed lasers for applications in communication, fast temporally resolved measurements (electro-optic sampling), and as a means for obtaining higher peak powers. In contrast to argon ion pumped mode-locked Ti:sapphire lasers, there is a need for compact, economical, low-noise, diode-pumped, infrared wavelength short-pulsed sources. This need is addressed in the first part of the thesis, where a 20 GHz dielectric resonator/optical modulator (DROM) is introduced and developed for harmonic mode-locking of a diode pumped Nd:BEL laser. Depending on the mode-locker drive frequency, two distinct regimes of mode-locking were observed: (1) 2.9 psec pulses at the cavity repetition-rate of 238 MH, (2) 3.9 psec pulses at the repetition-rate of 20 GHz. These are the shortest pulses yet reported for active mode-locking of a Nd laser. After the short pulses are created, it is desirable to have a means for controlling them. This leads to the concept of temporal imaging and time-lenses. There is an interesting analogy between the spatial problem of Fresnel diffraction and the temporal problem of first order dispersion. This can be extended to introduce the idea of a time-lens as a dual of a spatial lens (regular lens). The time-lens is simply a quadratic optical phase modulator in time, which is approximated by a portion of a sinusoidal phase modulator. Thus, by using phase modulators as lenses and grating pairs as dispersive elements, complete temporal imaging systems can be constructed in exact duality with spatial imaging systems. A resonant microwave optical phase modulator in LiNbO$\sb3$ with multiple passes based on an off-axis path in a stable optical resonator, is demonstrated as a time-lens. At 5.2 GHz operation, 44 radians of phase modulation was obtained at 1.06 $\mu$m wavelength for 13 W of microwave power. This corresponds to a time-lens with 31 psec aperture and 1.9 psec resolution. This was confirmed by demonstrating temporal focusing of 45 psec pulses to 1.9 psec.Subjects--Topical Terms:

649834
Electrical engineering.

Harmonic mode-locking of diode-pumped lasers and time-lenses with picosecond resolution.
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008 170521s1993 ||||||||||||||||| ||eng d
035 $a (MiAaPQ)AAI9309597
035 $a AAI9309597
040 $a MiAaPQ $c MiAaPQ
100 1 $a Godil, Asif A. $3 3185136
245 1 0 $a Harmonic mode-locking of diode-pumped lasers and time-lenses with picosecond resolution.
300 $a 111 p.
500 $a Source: Dissertation Abstracts International, Volume: 53-11, Section: B, page: 5887.
500 $a Adviser: Dave M. Bloom.
502 $a Thesis (Ph.D.)--Stanford University, 1993.
520 $a In recent years there has been great interest in short pulsed lasers for applications in communication, fast temporally resolved measurements (electro-optic sampling), and as a means for obtaining higher peak powers. In contrast to argon ion pumped mode-locked Ti:sapphire lasers, there is a need for compact, economical, low-noise, diode-pumped, infrared wavelength short-pulsed sources. This need is addressed in the first part of the thesis, where a 20 GHz dielectric resonator/optical modulator (DROM) is introduced and developed for harmonic mode-locking of a diode pumped Nd:BEL laser. Depending on the mode-locker drive frequency, two distinct regimes of mode-locking were observed: (1) 2.9 psec pulses at the cavity repetition-rate of 238 MH, (2) 3.9 psec pulses at the repetition-rate of 20 GHz. These are the shortest pulses yet reported for active mode-locking of a Nd laser. After the short pulses are created, it is desirable to have a means for controlling them. This leads to the concept of temporal imaging and time-lenses. There is an interesting analogy between the spatial problem of Fresnel diffraction and the temporal problem of first order dispersion. This can be extended to introduce the idea of a time-lens as a dual of a spatial lens (regular lens). The time-lens is simply a quadratic optical phase modulator in time, which is approximated by a portion of a sinusoidal phase modulator. Thus, by using phase modulators as lenses and grating pairs as dispersive elements, complete temporal imaging systems can be constructed in exact duality with spatial imaging systems. A resonant microwave optical phase modulator in LiNbO$\sb3$ with multiple passes based on an off-axis path in a stable optical resonator, is demonstrated as a time-lens. At 5.2 GHz operation, 44 radians of phase modulation was obtained at 1.06 $\mu$m wavelength for 13 W of microwave power. This corresponds to a time-lens with 31 psec aperture and 1.9 psec resolution. This was confirmed by demonstrating temporal focusing of 45 psec pulses to 1.9 psec.
590 $a School code: 0212.
650 4 $a Electrical engineering. $3 649834
650 4 $a Optics. $3 517925
690 $a 0544
690 $a 0752
710 2 $a Stanford University. $3 754827
773 0 $t Dissertation Abstracts International $g 53-11B.
790 $a 0212
791 $a Ph.D.
792 $a 1993
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9309597