Fixed-wavelength operation of a copper-laser-pumped dye laser injection seeded by low-power He-Ne lasers.

The design and operating characteristics of a dye laser pumped by a 3-W copper-vapor laser (CVL) and injection seeded by low-power (1-5 mW) He-Ne lasers at 633 nm are reported. An extremely simple optical arrangement is used wherein the output mirror of the He-Ne laser and a third mirror form the dye laser cavity. Laser efficiency in fixed-wavelength operation has been investigated for variable CVL pump power, He-Ne injection power and polarization, and cavity output coupling for a standard Rhodamine 590/Rhodamine 640 dye solution. Over 90% of free-running (unseeded) laser power is obtained in fixed-wavelength (seeded) operation at low CVL pump powers (≤1 W), dropping to approximately 60% at 3-W pump power. Maximum CVL pump to dye laser optical conversion efficiency in narrow-band, fixed-wavelength operation at 633 nm was 12%.

Attachments beyond infancy.

Attachment theory is extended to pertain to developmental changes in the nature of children's attachments to parents and surrogate figures during the years beyond infancy, and to the nature of other affectional bonds throughout the life cycle. Various types of affectional bonds are examined in terms of the behavioral systems characteristic of each and the ways in which these systems interact. Specifically, the following are discussed: (a) the caregiving system that underlies parents' bonds to their children, and a comparison of these bonds with children's attachments to their parents; (b) sexual pair-bonds and their basic components entailing the reproductive, attachment, and caregiving systems; (c) friendships both in childhood and adulthood, the behavioral systems underlying them, and under what circumstances they may become enduring bonds; and (d) kinship bonds (other than those linking parents and their children) and why they may be especially enduring.

Maternal affectionate behavior and infant-mother attachment patterns.

Four categories of affectionate behavior were identified in the 23 mothers of Ainsworth's longitudinal sample whose infants were observed in the strange situation at age 12 months. Mothers of babies classified as showing pattern A (anxiously attached and avoidant) in terms of their strange situation behavior were found to emphasize kissing proportionally more than the other mothers, and hugging/cuddling proportionally less. This is congruent with the previous finding that such mothers are averse to close bodily contact. Since mothers of pattern-A babies had also been found to be more rejecting, the findings suggest that rejection does not necessarily imply an absence of affectionate behavior but a different mode of expression.

Infant crying and maternal responsiveness: a rejoinder to Gewirtz and Boyd.

The criticisms leveled by Gewirtz and Boyd focus on 1 of 6 analyses upon which Bell and Ainsworth based their interpretation of findings--namely, cross-quarter correlations of measures of infant crying and maternal response. It is maintained that these measures were approximate, and that they were independent of each other in cross-quarter correlations. It is also maintained that the statistical procedures were appropriate to a small sample of subjects in naturalistic, longitudinal research. The three "illustrative" cases offered by Gewirtz and Boyd as ways of testing a contrary hypothesis are considered. These cases assumed maternal behavior patterns which, it is argued, do not occur. Finally, other evidence is cited, both from other studies and from within the Bell-Ainsworth paper itself, that supports the interpretation that Gewirtz and Boyd claim to have been unjustified.

Infant approach behavior as related to attachment.

The chief purpose of this study was to identify characteristics that distinguish approach as an attachment behavior from approach serving other behavioral systems. Locomotor approaches of 16 male and 10 female white middle-class infants to an attachment figure (the mother) and to a nonattachment figure (the visitor-observer) were examined under naturalistic conditions at home. Observations were made during 4-hour home visits at 3-week intervals; those from 26 to 54 weeks were used. When approach was examined in a free-choice situation and without regard to behavioral context, infants approached the mother proportionally (though slightly) more often than the visitor (p less than .05). In 2 behavioral contexts, however, spontaneous infant approaches were sharply differential to the mother; approaches accompanied by crying and approaches terminating in a pickup appeal were directed almost exclusively to the mother (p less than .0001 for both). Touching upon completion of the approach was not differential, except in the context of a pickup appeal. Object-oriented approaches were more often directed to the visitor than to the mother (p less than .002) and may be either exploratory or affiliative. It is suggested that neither approach nor touching can be assumed to serve the attachment system without consideration of context- both environmental and behavioral.