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Method and apparatus for oscillator start-up control for mode-locked laser

A technology of start-up control and oscillator, applied in lasers, laser parts, phonon exciters, etc., can solve problems such as damage

Inactive Publication Date: 2007-08-22
AMO DEVMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, once the laser is mode-locked, it can be damaged by excessive exposure of the saturable absorber to the laser power inside the cavity when the laser beam is focused

Method used

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  • Method and apparatus for oscillator start-up control for mode-locked laser
  • Method and apparatus for oscillator start-up control for mode-locked laser
  • Method and apparatus for oscillator start-up control for mode-locked laser

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Experimental program
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Embodiment Construction

[0021] Referring initially to Figure 1, there is shown a schematic diagram of an oscillator 10 for use in accordance with the present invention. Various configurations of oscillators may be used with the present invention. As shown, the oscillator 10 includes a laser-pumped diode 12 mounted on a submount 14 . The laser pump diode 12 generates a laser beam 16 with a certain wavelength. When the laser beam 16 exits the laser pump diode 12 , the lens 20 focuses the laser beam 16 through the dichroic beam splitter 22 and enters the laser working medium 24 .

[0022] Light in beam 16 from laser pump diode 12 will excite laser beam 26 on laser working medium 24 in a manner known to those skilled in the art. For example, the laser working medium 24 may consist of Nd glass. Once excited, laser beam 26 is emitted from laser working medium 24 to outcoupling mirror 28 . For purposes of this disclosure, when referring to FIG. 1 , it should be understood that the laser beam 26 and the ...

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PUM

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Abstract

The invention is directed to an apparatus and method for oscillator start-up control, and more particularly to an apparatus and method for overdriving a laser to obtain mode-lock operation. The oscillator with start-up control has a lasing medium mounted on a base. A laser pumping source is mounted on the base for inducing a laser beam from the lasing medium. A mode-lock detection device is mounted about the base. An overdrive circuit is coupled with the mode-lock detection and signal processing device for determining mode-lock status of the oscillator. The overdrive circuit overdrives the pump source when the oscillator is not in mode-lock status.

Description

Background technique [0001] A mode-locked laser produces a train of pulses at a very high repetition rate. For a laser to be mode-locked, it is required to oscillate simultaneously in multiple different cavity resonant modes, and these oscillations are in phase. Mode-locking is a special mode of operation of lasers in which modulation within the cavity (amplitude or phase modulator) forces all laser modes to operate at a constant phase, i.e., phase-locked or "mode-locked", so that the laser output The temporal shape constitutes a continuously repeating train of short (typically on the order of picoseconds or femtoseconds) light pulses. A saturable absorber is a commonly used mode-locking device. [0002] A saturable absorber is a material that absorbs light less as the light intensity increases. Saturable absorbers typically exhibit this effect on light intensity in solid-state laser cavities. The main parameters of a saturable absorber are the wavelength range (which it a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/098H01S3/10H01S3/094H01S3/102H01S3/113H01S3/13H01S3/131
CPCH01S3/09415H01S3/1312H01S3/1118H01S3/0816H01S3/1305H01S3/1024H01S3/00
Inventor 克里斯托弗·霍瓦斯鲁本·萨多雅恩
Owner AMO DEVMENT