Optical parametric oscillator including a saturable absorber hav

Details Optical parametric oscillator including a saturable absorber hav Optical parametric oscillator including a saturable absorber hav

1997-03-21

1999-04-06

Lee, John D.

Optical: systems and elements

Optical frequency converter

Parametric oscillator

372 22, G09F 139

Patent

active

058926143

ABSTRACT:
In an optical parametric oscillator including a laser medium (3) for producing a fundamental wave, a pair of optical elements (4 and 8) constituting a resonator exhibiting resonance for the fundamental wave, and a nonlinear optical crystal (7) between the optical elements for carrying out wavelength-conversion on the fundamental wave to produce a wavelength-converted wave so that one (8) of the optical elements transmits the wavelength-converted wave as an oscillator output wave, a saturable absorber (10) is located between the optical elements. The saturable absorber has a saturable absorption characteristic for the fundamental wave to allow transmission of the fundamental wave of a higher intensity higher than a predetermined intensity and to disallow transmission of the fundamental wave of a lower intensity hot higher than the predetermined intensity. The saturable absorber exhibits a decreased absorption coefficient at the higher intensity of the fundamental wave to allow transmission of the fundamental wave of the higher intensity without absorbing the fundamental wave of the higher intensity and an increased absorption coefficient at the lower intensity of the fundamental wave to disallow transmission of the fundamental wave of the lower intensity by absorbing the fundamental wave of the lower intensity.

REFERENCES:
patent: 3609389 (1971-09-01), Bjorkholm
patent: 5218609 (1993-06-01), Oda
patent: 5317577 (1994-05-01), Urakami et al.
Japanese Office Action dated Jun. 2, 1998 with English language translation of Japanese Examiner's comments.

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