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Apparatus and method for providing optical radiation

A technology of optical radiation and optical pulses, applied in laser devices, optical resonator structures, lasers, etc., can solve the problems of high cost of ultra-broadband electronic amplifiers, reduce electronic power requirements, fast turn-on and cut-off time, spontaneous Emission reduction effect

Active Publication Date: 2018-07-17
SPI LASERS UK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, UWB electronic amplifiers are expensive

Method used

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  • Apparatus and method for providing optical radiation
  • Apparatus and method for providing optical radiation
  • Apparatus and method for providing optical radiation

Examples

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Embodiment Construction

[0068] figure 1 A device for providing optical radiation 1 is shown comprising a laser diode 2, a pulse generator 9 and a modulator 5, wherein:

[0069] The laser diode 2 has a first terminal 6 and a second terminal 7;

[0070] the pulse generator 9 is connected to the first terminal 6;

[0071] the modulator 5 is connected to the second terminal 7;

[0072] The modulator 5 is chosen to bias the laser diode 2 at the lasing threshold 8 of the laser diode 2 ( figure 2 shown) below.

[0073] The pulse generator 9 is shown to include a step recovery pulse generator 3 and a differentiator 4 .

[0074] The laser diode 2 is shown emitting a light pulse 10 with a pulse width 11 and a period 12 . The pulse width 11 is defined by its full width half maximum value. The device can emit a pulse chain with a pulse repetition frequency equal to the inverse of period 12. figure 1 The device in particular provides light pulses 10 with pulse widths 11 in the picosecond to nanosecond ran...

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Abstract

Apparatus for providing optical radiation (1), which apparatus comprises a laser diode (2), a pulse generator (9), and a modulator (5), wherein: the pulse generator (9) is configured to emit picosecond pulses; the modulator (5) is configured to emit nanosecond pulses; the laser diode (2) has a first terminal (6) and a second terminal (7); the pulse generator (9) is connected to the first terminal(6); and the modulator (5) is configured to bias the laser diode (2) below a lasing threshold (8) of the laser diode (2), and the apparatus being characterized in that: the modulator (5) is connectedto the second terminal (7); the pulse generator (9) comprises a semiconductor junction (32) connected to a differentiator (4); the semiconductor junction (32) is such that electric current flowing through the semiconductor junction (32) can be turned off more quickly than it can be turned on; and the differentiator (4) is such that a step change that occurs when the electric current flowing through the semiconductor junction (32) is turned off is converted to an electrical pulse, thereby gain switching the laser diode (2) such that it emits an optical pulse (10) having an optical pulse width (11) less than 10ns.

Description

technical field [0001] The present invention relates to devices and methods for providing optical radiation. The invention has particular application to pulsed lasers, including semiconductor diode lasers and fiber lasers, and to marking, cutting and welding with such lasers. Background technique [0002] Gain switched laser diodes have important applications for marking, cutting, scribing and other industrial processing of materials requiring pulse widths in the picosecond to low nanosecond range. Pulses are generated by modulating the gain of the laser via the pump power. If high pump power is suddenly applied to the laser, laser emission starts after a short delay. The pulse starts with weak fluorescence and is amplified over multiple resonator round trips. Therefore, the energy stored in the gain medium is extracted in short pulses. Laser diodes can be operated with short current pulses or continuously modulated electrical signals. Typically, available pulse lengths...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/042H01S5/065H01S3/23H01S5/00
CPCH01S3/2308H01S5/0057H01S5/0656H01S2301/03H01S5/14H01S5/4006H01S5/0428
Inventor P·M·高尔曼C·A·科德马尔德
Owner SPI LASERS UK
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